Engine immobilizer system (without entry & start system)
Parts location System information Troubleshooting Diagnostic trouble codes Circuit diagnosis
ANTI-THEFT SYSTEM / SMART ENTRY & START SYSTEM
ENGINE IMMOBILIZER SYSTEM (WITHOUT ENTRY & START SYSTEM)
PARTS LOCATION
CIRCUIT FIGURE
DESCRIPTION OF FUNCTIONS
1. Description of the engine immobilizer system
(1) The engine immobilizer system records the key ID in the main body ECM (multiplex network body computer). If the key ID and the code recorded in the main body ECM do not match, the engine immobilizer system prohibits the engine from starting.
2. Functions of the main parts
| Components |
Summary |
|---|---|
| Main body ECM (Network gateway computer) |
This checks if the key ID received from the transponder key amplifier matches the registered key ID. Concurrently, it communicates with the combination meter ASSY*1 or the transponder ECM*2 and checks that the key ID (meter ID) recorded in the combination meter ASSY*1 or transponder ECM*2 matches the ID (meter ID) recorded in the main body ECM. Based on the request from the engine control computer, it encrypts each collation result and registered ID (engine ID), and sends them to the engine control computer. |
| Combination meter ASSY*1 |
Based on the request from the main body ECM (network gateway computer), it encrypts the registered ID, and sends it to the main body ECM (network gateway computer). |
| Transponder key ECM ASSY*2 |
Based on the request from the main body ECM (network gateway computer), it encrypts the registered ID, and sends it to the main body ECM (network gateway computer). |
| Transponder key amplifier |
This receives the key ID from the antenna coil, and outputs the key ID, which was amplified by the amplifier, to the main body ECM (network gateway computer). |
| Engine control computer |
When the engine starts, this communicates with the main body ECM (network gateway computer), and receives the key ID, the meter ID collation result, and the encrypted ID (engine ID) of the main body ECM (network gateway computer). If any of them do not match, it stops (prohibits) the engine from starting. |
| Unlock warning switch ASSY |
This detects a key inserted in the key cylinder and outputs the result to the main body ECM (network gateway computer). |
*1: With a transponder ECM
*2: Without a transponder ECM
*2: Without a transponder ECM
3. System functions
(1) When the main body ECM (network gateway computer) detects that the unlock warning switch ASSY is ON, it powers the transponder key amplifier and generates a magnetic field around the antenna coil. The transponder chip inside the key grip outputs a key ID signal by the electromotive force generated by the magnetic field. The transponder key amplifier receives the key ID code signal, amplifies it by an amplifier, and sends it to the main body ECM (network gateway computer).
The main body ECM (network gateway computer) checks if the key ID received from the transponder key amplifier matches the registered key ID. Concurrently, the main body ECM (network gateway computer) communicates with the combination meter ASSY*1 or the transponder ECM*2 and checks that the ID (meter ID) recorded in the combination meter ASSY*1 or transponder ECM*2 matches the ID (meter ID) recorded in the main body ECM (network gateway computer).
When starting the engine, the engine control computer communicates with the main body ECM (network gateway computer), and checks the collation result between the key and the combination meter ASSY*1 or the transponder ECM*2. Also, it checks if the ID (engine ID) recorded in the main body ECM (network gateway computer) matches, and if any does not match, it stops the engine from starting.
The main body ECM (network gateway computer) checks if the key ID received from the transponder key amplifier matches the registered key ID. Concurrently, the main body ECM (network gateway computer) communicates with the combination meter ASSY*1 or the transponder ECM*2 and checks that the ID (meter ID) recorded in the combination meter ASSY*1 or transponder ECM*2 matches the ID (meter ID) recorded in the main body ECM (network gateway computer).
When starting the engine, the engine control computer communicates with the main body ECM (network gateway computer), and checks the collation result between the key and the combination meter ASSY*1 or the transponder ECM*2. Also, it checks if the ID (engine ID) recorded in the main body ECM (network gateway computer) matches, and if any does not match, it stops the engine from starting.
*1: With a transponder ECM
*2: Without a transponder ECM
*2: Without a transponder ECM
HOW TO PROCEED WITH TROUBLESHOOTING
NOTE:
·Use these procedures to troubleshoot the engine immobiliser system.
·*: Use the SSM3.
·*: Use the SSM3.
1.
VEHICLE BROUGHT TO WORKSHOP
NEXT▼
2.
INSPECT BATTERY VOLTAGE
Standard voltage
: 11 to 14 V
If the voltage is below 11V, recharge or replace the battery before proceeding.
NOTE:
A simple method to determine whether the battery is depleted is to operate the horn.
NEXT▼
3.
CAN communication system check
(1) Check CAN communication system. (Refer to 
)
)
Result
| Result |
Proceed to |
|---|---|
| Functioning properly |
A |
| Not functioning properly |
B |
B
>GO TO CAN COMMUNICATION SYSTEM (Refer to )
)A▼
4.
CHECK FOR DTC*
(1) Check for DTCs and note any codes that are output. (See page )
)
(2) Based on the DTCs output above, proceed to each diagnostic procedure.
B
>To engine control system
C
>PROCEED TO DTC CHART (See page )
)A▼
5.
PROBLEM SYMPTOMS TABLE
(1) Refer to Problem Symptoms Table. (See page )
)Result
| Result |
Proceed to |
|---|---|
| Fault is not listed in problem symptoms table |
A |
| Fault is listed in problem symptoms table |
B |
B
>Go to step 7
A▼
6.
OVERALL ANALYSIS AND TROUBLESHOOTING*
(1) Check Current Data Display & Save / System Operation Check Mode. (Refer to )
)(2) Terminals of ECU. (See page )
)NEXT▼
7.
ADJUST, REPAIR OR REPLACE
NEXT▼
8.
CHECK FOR DTC*
(1) Clear the DTCs. (See page )
)(2) Check for DTCs. (See page )
)
NOTE:
Before checking for DTCs, perform the "DTC Output Confirmation Operation" of each diagnostic procedure. (See page )
)B
>GO TO DIAGNOSTIC TROUBLE CODE CHART (See page )
)A▼
END
PROBLEM SYMPTOMS TABLE
NOTE:
·Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
·Inspect the fuses and relays related to this system before inspecting the suspected areas below.
·Inspect the fuses and relays related to this system before inspecting the suspected areas below.
Engine Immobiliser System
| Symptom |
Suspected Area |
See page |
|---|---|---|
| Security indicator light does not blink |
Proceed to "Security Indicator Light does not Blink" |
|
ECM TERMINAL ARRANGEMENT
1. Check the transponder key amplifier.
(1) Disconnect the D54 transponder key amplifier connector.
(2) Refer to the table below and measure the resistance and the voltage and check for a pulse.
| Terminal No. (symbol) |
Input/output |
Terminal description |
Conditions |
Specified condition |
|---|---|---|---|---|
| D54-7 (AGND) - Chassis ground |
- |
Ground |
Always |
1 Ω or less |
(3) Reconnect the D54 transponder key amplifier connector.
(4) Refer to the table below and measure the voltage and check for a pulse.
| Terminal No. (symbol) |
Input/output |
Terminal description |
Conditions |
Specified condition |
|---|---|---|---|---|
| D54-1 (VC5) - D54-7 (AGND) |
Input |
Transponder key amplifier power supply |
Key is not inserted to the ignition key cylinder. |
1 V or less |
| Key is inserted to the ignition key cylinder. |
4.5 to 5.5 V |
|||
| D54-4 (CODE) - D54-7 (AGND) |
Output |
Key code data revision signal |
Key is not inserted to the ignition key cylinder. |
1 V or less |
| Key is inserted to the ignition key cylinder. |
Pulse generation |
|||
| D54-5 (TXCT) - D54-7 (AGND) |
Output |
Key code output signal |
Key is not inserted to the ignition key cylinder. |
1 V or less |
| Key is inserted to the ignition key cylinder. |
Pulse generation |
2. Check the main body ECM (multiplex network body ECM).
Captions in illustration
| *1 |
Instrument panel junction block ASSY |
*2 |
Main body ECM (multiplex network body ECM) |
(1) Remove the main body ECM (multiplex network body ECM) from the instrument panel junction block ASSY.
(2) Disconnect the connectors D5, D6, and A73 of the main body ECM (multiplex network body ECM).
(3) Measure the resistance and voltage based on the following table.
| Terminal No. (symbol) |
Input/output |
Terminal description |
Conditions |
Specified condition |
|---|---|---|---|---|
| MB-1 - chassis ground |
Input |
Battery power supply |
Always |
11 to 14 V |
| MB-8 - chassis ground |
Input |
IG SW power supply |
IG SW ON |
11 to 14 V |
| IG SW Off |
1 V or less |
|||
| MB-9 - chassis ground |
Input |
ACC power supply |
IG SW ACC |
11 to 14 V |
| IG SW Off |
1 V or less |
|||
| MB-11 - chassis ground |
- |
Ground |
Always |
1 Ω or less |
| MB-32 - chassis ground |
Input |
Battery power supply |
Always |
11 to 14 V |
| D5-22 - chassis ground |
Input |
Unlock warning switch input |
Key is not inserted to the ignition key cylinder (OFF). |
1 V or less |
| Key is inserted to the ignition key cylinder (ON). |
11 to 14 V |
|||
| D6-1 - Chassis ground |
- |
Ground |
Always |
1 Ω or less |
| A73-4 - chassis ground |
- |
Ground |
Always |
1 Ω or less |
(4) Reconnect the connector D5, D6, and A73 of the main body ECM (multiplex network body ECM).
(5) Install the main body ECM (multiplex network body ECM) to the instrument panel junction block ASSY.
(6) Refer to the table below and measure the resistance and the voltage and check for a pulse.
| Terminal No. (symbol) |
Input/output |
Terminal description |
Conditions |
Specified condition |
|---|---|---|---|---|
| A73-5 - chassis ground |
Output |
Key code data revision signal |
Key is not inserted to the ignition key cylinder. |
1 V or less |
| Key is inserted to the ignition key cylinder. |
Pulse generation |
|||
| A73-9 - chassis ground |
Input/output |
EFI communication |
IG SW Off |
1 V or less |
| IG SW ON |
Pulse generation |
|||
| A73-8 - chassis ground |
Output |
Transponder key amplifier power supply |
Key is not inserted to the ignition key cylinder. |
1 V or less |
| Key is inserted to the ignition key cylinder. |
4.5 to 5.5 V |
|||
| A73-15 - chassis ground |
Input |
Key code output signal |
Key is not inserted to the ignition key cylinder. |
1 V or less |
| Key is inserted to the ignition key cylinder. |
Pulse generation |
|||
| A73-16 - chassis ground |
- |
Transponder key amplifier GND-output short |
Always |
1 Ω or less |
| A73-17 - chassis ground |
Input/output |
Transponder key ECM communication |
IG SW Off |
1 V or less |
| IG SW ON |
Pulse generation |
*: with transponder key ECM ASSY
3. Check the transponder key ECM ASSY.
(1) Disconnect the D64 transponder ECM ASSY connector.
(2) Measure the resistance and voltage based on the following table.
| Terminal No. (symbol) |
Input/output |
Terminal description |
Conditions |
Specified condition |
|---|---|---|---|---|
| A64-1 (+B) - Chassis ground |
Input |
Battery power supply |
Always |
11 to 14 V |
| A64-5 (GND) - Chassis ground |
- |
Ground |
Always |
1 Ω or less |
(3) Reconnect the D64 transponder ECM ASSY connector.
4. CHECK ECM
(1) Refer to the table below and measure the resistance and the voltage and check for a pulse.
| Terminal No. (symbol) |
Input/output |
Terminal description |
Conditions |
Specified condition |
|---|---|---|---|---|
| A33-1 (VBEC2) - A36-4 (GNDEG1) |
Input |
Battery power supply |
IG SW Off |
1 V or less |
| IG SW ON |
11 to 14 V |
|||
| A33-2 (BATT) - A36-4 (GNDEG1) |
Input |
Battery power supply |
Always |
11 to 14 V |
| A34-6 (VBEC1) - A36-4 (GNDEG1) |
Input |
Battery power supply |
IG SW Off |
1 V or less |
| IG SW ON |
11 to 14 V |
|||
| A35-25 (IMO1) - A36-4 (GNDEG1) |
Input/output |
Main body ECM communication |
IG SW Off |
1 V or less |
| IG SW ON |
Pulse generation |
|||
| A36-4 (GNDEG1) - chassis ground |
- |
Ground |
Always |
1 Ω or less |
DTC CHECK / CLEAR
1. CHECK FOR MAIN BODY ECM (MULTIPLEX NETWORK BODY ECM) DTC
(1) Connect the SSM3 to the DLC3.
(2) Turn the ignition switch to ON.
(3) Turn the SSM3 on.
(4) Enter the following menus: [Integ. unit mode] → [Diagnostic Code(s) Display]
(5) Check for DTCs.
2. CHECK FOR ECM DTC
(1) Connect the SSM3 to the DLC3.
(2) Turn the ignition switch to ON.
(3) Turn the SSM3 on.
(4) Enter the following menus: [Engine Control System] → [Diagnostic Code(s) Display]
(5) Check for DTCs.
3. CLEAR MAIN BODY ECM (MULTIPLEX NETWORK BODY ECM) DTC
(1) Connect the SSM3 to the DLC3.
(2) Turn the ignition switch to ON.
(3) Turn the SSM3 on.
(4) Enter the following menus: [Integ. unit mode] → [Clear Memory]
(5) Clear the DTCs.
4. CLEAR ECM DTC
(1) Connect the SSM3 to the DLC3.
(2) Turn the ignition switch to ON.
(3) Turn the SSM3 on.
(4) Enter the following menus: [Engine Control System] → [Diagnostic Code(s) Display]
(5) Clear the DTCs.
CURRENT DATA DISPLAY & SAVE / SYSTEM OPERATION CHECK MODE
1. Current Data Display & Save
NOTE:
Using the SSM3 to read the [Current Data Display & Save] allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the [Current Data Display & Save] information early in troubleshooting is one way to save diagnostic time.
CAUTION:
In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.
(1) Connect the SSM3 to the DLC3.
(2) Turn the ignition switch to ON.
(3) Turn the SSM3 on.
(4) Enter the following menus: [Integ. unit mode] → [Current Data Display & Save]
(5) Enter the following menus: [Engine Control System] → [Current Data Display & Save]
(6) Read the [Current Data Display & Save] according to the display on the SSM3.
Main Body
| Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
| [Ignition] |
Ignition switch ON signal / OFF or ON |
OFF: Ignition switch ACC or off ON: Ignition switch ON |
- |
| [ACC SW] |
Ignition switch ACC signal / OFF or ON |
OFF: Ignition switch ACC or off ON: Ignition switch ON |
- |
| [Key Unlock Warning SW] |
Unlock warning switch signal / OFF or ON |
OFF: No key in ignition key cylinder ON: Key inserted in ignition key cylinder |
- |
| [BATT voltage (control)] |
Battery power supply voltage / 10 to 15V |
11 to 14 V |
- |
| [BATT voltage (BACKUP) ] |
Battery power supply backup voltage / 10 to 15V |
11 to 14 V |
- |
| [ABS_CM Power Voltage] |
Ignition switch power supply voltage / 10 to 15V |
11 to 14 V |
- |
| [ACC voltage] |
ACC switch power supply voltage / 10 to 15V |
11 to 14 V |
- |
| [Immobilizer pilot lamp output] |
Security indicator light status / OFF or ON |
OFF: Security indicator light OFF ON: Security indicator light blinks |
- |
| [Immobilizer power Supply] |
Main body ECU (multiplex network body ECU) engine immobiliser system power supply output status / OFF or ON |
OFF: Engine immobiliser unset ON: Engine immobiliser set |
- |
Engine and ECT
| Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
| [Immobilizer Fuel Cut] |
Status of immobiliser fuel cut / ON or OFF |
- |
- |
| [Immobilizer Fuel Cut History] |
Status of immobiliser fuel cut history / ON or OFF |
- |
- |
2. System Operation Check Mode
NOTE:
Using the SSM3 to perform [System Operation Check Mode] allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing [System Operation Check Mode] early in troubleshooting is one way to save diagnostic time. [Current Data Display & Save] information can be displayed while performing [System Operation Check Mode].
(1) Connect the SSM3 to the DLC3.
(2) Turn the ignition switch to ON.
(3) Turn the SSM3 on.
(4) Enter the following menus: [Integ. unit mode] → [Work Support] → [System Operation Check Mode]
DIAGNOSTIC TROUBLE CODE CHART
Main Body ECU (Multiplex Network Body ECU)
| DTC Code |
Detection Item |
See page |
|---|---|---|
| B1401 |
M collation NG |
|
| B1402 |
Immobilizer key collation NG |
|
| B1405 |
SCU collation NG |
|
| B1406 |
SCU EEPROM NG |
|
| B1407 |
M communication error |
|
| B1408 |
Meter EEPROM error |
|
| B1409 |
SCU communication abnormal |
|
| B1410 |
Transponder communication error |
|
| B1411 |
Immobilizer antenna communication failure |
|
ECM
| DTC Code |
Detection Item |
See page |
|---|---|---|
| B1570 |
Antenna |
|
| B1571 |
Mismatching identification code (immobilizer collation mismatched) |
|
| B1572 |
IMM Circuit Failure (Except Antenna Circuit) |
|
| B1576 |
EGI unit EEPROM |
|
| B1577 |
Immobilizer unit EEPROM |
|
| B1578 |
Meter abnormal |
|
| DTC | B1401 | M collation NG |
|---|
Circuit description
The main body ECM (multiplex network body ECM) memorizes this code if the reference code does not match between the main body ECM (multiplex network body ECM) and the combination meter ASSY.
| DTC NO. |
DTC detecting condition |
Faulty part |
|---|---|---|
| B1401 |
Reference codes are incompatible between main body ECM (multiplex network body ECM) and combination meter ASSY. |
Combination meter ASSY |
Inspection steps
CAUTION:
·The engine immobilizer system uses the CAN communication system. First, following the “How to troubleshoot”, check that no malfunction is present in the communication system before proceeding with troubleshooting.
·When replacing the combination meter ASSY, refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
·When replacing the combination meter ASSY, refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
1.
DTC check
(1) Check the DTC. (Refer to )
)
Criteria
: DTC B1407 or B1408 is not output.
NG
>To the list of diagnostic codes (Refer to )
)OK▼
2.
Registration of ECM ID codes (combination meter ASSY - main body ECM)
(1) Register ECM ID codes. (Refer to the “immobilizer registration manual”)
Criteria
: You can register ECM ID codes.
NG
> Go to Step 3.
OK▼
Complete
3.
DTC check
(1) Check the DTC. (Refer to )
)
Criteria
: DTC B1407 or B1408 is not output.
NG
>To the list of diagnostic codes (Refer to )
)OK▼
Replacement of combination meter ASSY
| DTC | B1402 | Immobilizer key collation NG |
|---|
Circuit description
The main body ECM (multiplex network body ECM) outputs this code if an unauthorized key (key not registered in main body ECM (multiplex network body ECM)) is inserted in the ignition key cylinder.
| DTC NO. |
DTC detecting condition |
Inspection parts |
|---|---|---|
| B1402 |
When unauthorized key (key not registered in main body ECM (multiplex network body ECM)) is inserted in ignition key cylinder |
·Key ·Main body ECM (multiplex network body ECM) |
Inspection steps
CAUTION:
·The engine immobilizer system uses the CAN communication system. First, following the “How to troubleshoot”, check that no malfunction is present in the communication system before proceeding with troubleshooting.
·When replacing the main body ECM (multiplex network body ECM), refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
·When replacing the main body ECM (multiplex network body ECM), refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
1.
DTC check
(1) Check the DTC. (Refer to )
)
Criteria
: DTC B1410 or B1411 is not output.
NG
>To the list of diagnostic codes (Refer to )
)OK▼
2.
Key registration
(1) Register the key. (Refer to the “immobilizer registration manual”)
Criteria
: Key ID can be registered.
NG
> Go to Step 3.
OK▼
Complete
3.
Key registration
(1) Register the key ID by using the key not registered. (Refer to the “immobilizer registration manual”)
Criteria
: Key ID can be registered.
NG
>Replace the main body ECM (multiplex network body ECM).
OK▼
Complete
| DTC | B1405 | SCU collation NG |
|---|
Circuit description
The main body ECM (multiplex network body ECM) outputs this code if the reference code does not match between the main body ECM (multiplex network body ECM) and the transponder key ECM ASSY.
| DTC NO. |
DTC detecting condition |
Faulty part |
|---|---|---|
| B1405 |
The reference code of main body ECM (multiplex network body ECM) and the reference code sent from the transponder key ECM ASSY do not match. |
Transponder key ECM ASSY |
Inspection steps
CAUTION:
·The engine immobilizer system uses the CAN communication system. First, following the “How to troubleshoot”, check that no malfunction is present in the communication system before proceeding with troubleshooting.
·When replacing the transponder key ECM ASSY, refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
·When replacing the transponder key ECM ASSY, refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
1.
DTC check
(1) Check the DTC. (Refer to )
)
Criteria
: DTC B1406 or B1409 is not output.
NG
>To the list of diagnostic codes (Refer to )
)OK▼
2.
Registration of ECM ID codes (transponder key ECM ASSY - main body ECM)
(1) Register ECM ID codes. (Refer to the “immobilizer registration manual”)
Criteria
: You can register ECM ID codes.
NG
> Go to Step 3.
OK▼
Complete
3.
DTC check
(1) Check the DTC. (Refer to )
)
Criteria
: DTC B1406 or B1409 is not output.
NG
>To the list of diagnostic codes (Refer to )
)OK▼
Replace transponder key ECM ASSY.
| DTC | B1406 | SCU EEPROM NG |
|---|
Circuit description
The main body ECM outputs this code if the internal failure of transponder key ECM ASSY is detected or it can not access ROM inside the transponder key ECM ASSY.
| DTC NO. |
DTC detecting condition |
Faulty part |
|---|---|---|
| B1406 |
When access to the ROM inside the transponder key ECM ASSY is not possible or the internal failure of transponder key ECM ASSY occurs |
Transponder key ECM ASSY |
Inspection steps
CAUTION:
·The engine immobilizer system uses the CAN communication system. First, following the “How to troubleshoot”, check that no malfunction is present in the communication system before proceeding with troubleshooting.
·When replacing the transponder key ECM ASSY, refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
·When replacing the transponder key ECM ASSY, refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
1.
ECM communication ID registration (transponder key ECM ASSY - main body ECM)
(1) Register the ECM communication ID. (Refer to the “immobilizer registration manual”)
Next▼
2.
DTC check
(1) Check the DTC. (Refer to )
)
Criteria
: DTC B1406 is not output.
NG
>Replace transponder key ECM ASSY.
OK▼
Complete
| DTC | B1407 | M communication error |
|---|
Circuit description
The main body ECM (multiplex network body ECM) outputs this code if a communication error is detected between the main body ECM (multiplex network body ECM) and the combination meter ASSY.
| DTC NO. |
DTC detecting condition |
Faulty part |
|---|---|---|
| B1407 |
When communication error between main body ECM (multiplex network body ECM) and combination meter ASSY occurs |
Combination meter ASSY |
Inspection steps
CAUTION:
When replacing the combination meter ASSY, refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
| DTC | B1408 | Meter EEPROM error |
|---|
Circuit description
Inspection steps
CAUTION:
·The engine immobilizer system uses the CAN communication system. First, following the “How to troubleshoot”, check that no malfunction is present in the communication system before proceeding with troubleshooting.
·When replacing the combination meter ASSY, refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
·When replacing the combination meter ASSY, refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
1.
ECM communication ID registration (combination meter ASSY - main body ECM)
(1) Register the ECM communication ID. (Refer to the “immobilizer registration manual”)
Next▼
2.
DTC check
(1) Check the DTC. (Refer to )
)
Criteria
: DTC B1408 is not output.
NG
>Replacement of combination meter ASSY
OK▼
Complete
| DTC | B1409 | SCU communication abnormal |
|---|
Circuit description
The main body ECM (multiplex network body ECM) outputs this code if a communication error is detected between the main body ECM (multiplex network body ECM) and the transponder key ECM ASSY.
| DTC NO. |
DTC detecting condition |
Inspection parts |
|---|---|---|
| B1409 |
When communication error between main body ECM (multiplex network body ECM) and transponder key ECM ASSY occurs |
·Harness or connector ·Main body ECM (multiplex network body ECM) ·Transponder key ECM ASSY |
Circuit figure
Inspection steps
CAUTION:
·The engine immobilizer system uses the CAN communication system. First, following the “How to troubleshoot”, check that no malfunction is present in the communication system before proceeding with troubleshooting.
·When replacing the main body ECM (multiplex network body ECM), the transponder key, or the transponder key ECM ASSY, refer to the “immobilizer registration manual”.
·Before performing the following inspection steps, check the fuses related to this system.
·When replacing the main body ECM (multiplex network body ECM), the transponder key, or the transponder key ECM ASSY, refer to the “immobilizer registration manual”.
·Before performing the following inspection steps, check the fuses related to this system.
1.
Check the harness and connector (instrument panel junction block - battery, body, ground).
(1) Disconnect the connector A73 and D6 of the main body ECM (multiplex network body ECM).
(2) Disconnect the connector 3A, 3B, and 3C of instrument panel junction block ASSY.
NG
>Repair or replacement of the harnesses or connectors
OK▼
2.
Unit inspection of instrument panel junction block ASSY
(1) Remove the instrument panel junction block ASSY.
(2) Remove the main body ECM (multiplex network body ECM) from the instrument panel junction block ASSY.
NG
>Replacement of the instrument panel junction block ASSY
OK▼
3.
Check the harness and connector (transponder key ECM ASSY - battery, body, ground).
(1) Disconnect the D64 transponder ECM ASSY connector.
(2) Measure the voltage according to the following table.
NG
>Repair or replacement of the harnesses or connectors
OK▼
4.
Check the harness and connector (main body ECM - transponder key ECM ASSY).
NG
>Repair or replacement of the harnesses or connectors
OK▼
5.
Replace transponder key ECM ASSY.
(1) Temporarily replace the transponder key ECM with new one or one that is functioning properly. (Refer to the “immobilizer registration manual”)
CAUTION:
Do not perform registration.
Next▼
6.
DTC check
(1) Check the DTC. (Refer to )
)
Criteria
: DTC B1409 is not output.
NG
>Return the transponder key ECM ASSY to its original position, and replace the main body ECM (multiplex network body ECM)
OK▼
END (faulty transponder key ECM ASSY)
| DTC | B1410 | Transponder communication error |
|---|
Circuit description
The main body ECM (network gateway computer) outputs this code if a communication error is detected between the key and the main body ECM (network gateway computer) or if the key for another vehicle is inserted in the ignition key cylinder.
| DTC NO. |
DTC detecting condition |
Inspection parts |
|---|---|---|
| B1410 |
Communication error between the key and the main body ECM (network gateway computer) |
·Key ·Transponder key amplifier ·Instrument panel junction block ASSY ·Main body ECM (Network gateway computer) ·Wiring harness or connector |
Circuit figure
Inspection steps
CAUTION:
·The engine immobilizer system uses the CAN communication system. First, following the “How to troubleshoot”, check that no malfunction is present in the communication system before proceeding with troubleshooting.
·When replacing the main body ECM (multiplex network body ECM), refer to the “immobilizer registration manual”.
·Before performing the troubleshooting, check the fuse of this circuit.
·When replacing the main body ECM (multiplex network body ECM), refer to the “immobilizer registration manual”.
·Before performing the troubleshooting, check the fuse of this circuit.
1.
DTC check
(1) Insert the registered key into the ignition key cylinder.
(2) Using the SSM3, check if the diagnostic code is output for all keys registered with the vehicle.
B
>Replace the key that does not output B1410.
A▼
2.
Inspection of the wire harnesses and connectors (power supply, GND)
(1) Disconnect connectors A73 and D6 for the main body ECM (network gateway computer).
(2) Disconnect connectors 3A, 3B, and 3C for the instrument panel junction block ASSY.
NG
>Repair or replacement of wiring harness or connector
OK▼
3.
Unit inspection of the instrument panel junction block ASSY.
(1) Remove the main body ECM (network gateway computer) from the instrument panel junction block ASSY.
(2) Measure the resistance between the terminals.
Resistance
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| MB-1 (BECU) - 3A-27 |
Always |
Less than 1 Ω |
| MB-32 (+B) - 3C-19 |
Always |
Less than 1 Ω |
| MB-11 (GND) - 3B-18 |
Always |
Less than 1 Ω |
Captions in illustration
| *a |
Connector not connected (Instrument panel junction block ASSY) |
- |
- |
NG
>Replacement of the instrument panel junction block ASSY
OK▼
4.
Inspection of the transponder key amplifier (power supply circuit)
(1) Install the main body ECM (network gateway computer) on the instrument panel junction block ASSY.
(2) Connect connectors 3A, 3B, and 3C for the instrument panel junction block ASSY.
(3) Disconnect the connector D54 of the transponder key amplifier.
(4) Measure the voltage between the terminals.
B
> Go to Step 6.
A▼
5.
Inspection of wiring harness and connector (Transponder key amplifier - Main body ECM (network gateway computer))
(1) Disconnect the A73 connector of the main body ECM (network gateway computer).
NG
>Repair or replacement of wiring harness or connector
OK▼
Replacement of the main body ECM (Network gateway computer)
6.
Inspection of the wiring harness and the connector (transponder key amplifier - chassis ground)
B
> Go to Step 8.
A▼
7.
Inspection of wiring harness and connector (Transponder key amplifier - Main body ECM (network gateway computer))
(1) Disconnect the A73 connector of the main body ECM (network gateway computer).
NG
>Repair or replacement of wiring harness or connector
OK▼
Replacement of the main body ECM (Network gateway computer)
8.
Inspection of wiring harness and connector (Transponder key amplifier - Main body ECM (network gateway computer))
(1) Disconnect the A73 connector of the main body ECM (network gateway computer).
(2) Measure the resistance between the terminals.
NG
>Repair or replacement of wiring harness or connector
OK▼
9.
Replacement of the transponder key amplifier
(1) Replace with a new or normal transponder key amplifier.
Next▼
10.
DTC check
(1) Insert the key into the ignition key cylinder, and then turn to IG OFF or ACC ON.
(2) Check DTC using SSM3.
Criteria
: DTC B1410 is not output
NG
> Go to Step 11.
OK▼
Complete (Faulty transponder key amplifier)
11.
DTC check
(1) Replace the key that outputs diagnostic code B1410, and perform registration. (Refer to the “immobilizer registration manual”)
(2) Check DTC using SSM3.
Criteria
: DTC B1410 is not output
NG
>Replacement of the main body ECM (network gateway computer) (Refer to )
)OK▼
Complete (Faulty key)
| DTC | B1411 | Immobilizer antenna communication failure |
|---|
Circuit description
The main body ECM (network gateway computer) outputs this code if a fault is detected in the antenna coil inside the transponder key amplifier.
| DTC NO. |
DTC detecting condition |
Inspection parts |
|---|---|---|
| B1411 |
Faulty antenna coil inside transponder key amplifier |
·Transponder key amplifier ·Main body ECM (Network gateway computer) |
Inspection steps
CAUTION:
·The engine immobilizer system uses the CAN communication system. First, following the “How to troubleshoot”, check that no malfunction is present in the communication system before proceeding with troubleshooting.
·When replacing the main body ECM (network gateway computer), refer to the “immobilizer registration manual”.
·When replacing the main body ECM (network gateway computer), refer to the “immobilizer registration manual”.
1.
DTC check
(1) Remove the key from the ignition key cylinder.
(2) Insert the key into the ignition key cylinder, and then turn the ignition switch to ON.
(3) Check DTC using SSM3.
Criteria
: DTC B1411 is not output
NG
> Go to Step 2.
OK▼
Complete
2.
Replacement of the transponder key amplifier
(1) Replace with a new or normal transponder key amplifier.
Next▼
3.
DTC check
(1) Insert the key into the ignition key cylinder, and then turn the ignition switch to ON.
(2) Check DTC using SSM3.
Criteria
: DTC B1411 is not output
NG
>Replacement of the main body ECM (Network gateway computer)
OK▼
Complete (Faulty transponder key amplifier)
| DTC | B1570 | Antenna |
|---|
Circuit description
The main body ECM (network gateway computer) outputs this code if a fault is detected in the antenna coil inside the transponder key amplifier.
| DTC NO. |
DTC detecting condition |
Inspection parts |
|---|---|---|
| B1570 |
Faulty antenna coil inside transponder key amplifier |
·Transponder key amplifier ·Main body ECM (Network gateway computer) |
Inspection steps
CAUTION:
·The engine immobilizer system uses the CAN communication system. First, following the “How to troubleshoot”, check that no malfunction is present in the communication system before proceeding with troubleshooting.
·When replacing the main body ECM (network gateway computer), refer to the “immobilizer registration manual”.
·When replacing the main body ECM (network gateway computer), refer to the “immobilizer registration manual”.
1.
DTC check
(1) Remove the key from the ignition key cylinder.
(2) Insert the key into the ignition key cylinder, and then turn the ignition switch to ON.
(3) Check DTC using SSM3.
Criteria
: DTC B1570 is not output
NG
> Go to Step 2.
OK▼
Complete
2.
Replacement of the transponder key amplifier
(1) Replace with a new or normal transponder key amplifier.
Next▼
3.
DTC check
(1) Insert the key into the ignition key cylinder, and then turn the ignition switch to ON.
(2) Check DTC using SSM3.
Criteria
: DTC B1570 is not output
NG
>Replacement of the main body ECM (Network gateway computer)
OK▼
Complete (Faulty transponder key amplifier)
| DTC | B1571 | Mismatching identification code (immobilizer collation mismatched) |
|---|
Circuit description
The ECM outputs this code if the reference code between main body ECM (multiplex network body ECM) and the ECM does not match.
| DTC NO. |
DTC detecting condition |
Inspection parts |
|---|---|---|
| B1571 |
Reference codes are incompatible between main body ECM (multiplex network body ECM) and ECM. |
·ECM ·Main body ECM (multiplex network body ECM) |
Inspection steps
CAUTION:
·The engine immobilizer system uses the CAN communication system. First, following the “How to troubleshoot”, check that no malfunction is present in the communication system before proceeding with troubleshooting.
·When replacing the main body ECM (multiplex network body ECM) or ECM, refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
·When replacing the main body ECM (multiplex network body ECM) or ECM, refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
1.
Check the number of registered key.
(1) Connect the SSM3 to the DLC3.
(2) Turn the ignition switch to ON.
(3) Turn on the SSM3.
(4) Enter the following menu: [Integ. unit mode] → [Current Data Display & Save] → [Number of registered ID codes]
B
> Go to Step 3.
A▼
2.
Key registration
(1) Register the key. (Refer to the “immobilizer registration manual”)
Criteria
: Key ID can be registered.
NG
> Go to Step 4.
OK▼
Complete
3.
Registration of ECM ID codes (ECM - main body ECM (multiplex network body ECM))
(1) Register ECM ID codes. (Refer to the “immobilizer registration manual”)
Criteria
: You can register ECM ID codes.
NG
> Go to Step 4.
OK▼
Complete
4.
DTC check
(1) Check the DTC. (Refer to )
)B
>To the list of diagnostic codes (Refer to )
)A▼
5.
Replacement of the ECM
(1) Temporarily replace the ECM with new one or one that is functioning properly.
Next▼
6.
Registration of ECM ID codes (ECM - main body ECM (multiplex network body ECM))
(1) Register ECM ID codes. (Refer to the “immobilizer registration manual”)
Criteria
: You can register ECM ID codes.
NG
>Replacement of main body ECM (multiplex network body ECM)
OK▼
Complete
| DTC | B1572 | IMM Circuit Failure (Except Antenna Circuit) |
|---|
Circuit description
The ECM outputs this code if a communication error is detected between main body ECM (multiplex network body ECM) and ECM.
| DTC NO. |
DTC detecting condition |
Inspection parts |
|---|---|---|
| B1572 |
When communication error between main body ECM (multiplex network body ECM) and ECM occurs |
·Harness or connector ·ECM ·Instrument panel junction block ASSY ·Main body ECM (multiplex network body ECM) |
Circuit figure
Inspection steps
CAUTION:
·The engine immobilizer system uses the CAN communication system. First, following the “How to troubleshoot”, check that no malfunction is present in the communication system before proceeding with troubleshooting.
·When replacing the main body ECM (multiplex network body ECM) or ECM, refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
·Before performing the following inspection steps, check the fuses related to this system.
·When replacing the main body ECM (multiplex network body ECM) or ECM, refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
·Before performing the following inspection steps, check the fuses related to this system.
1.
Check the harness and connector (battery, body, GND-output short).
(1) Disconnect the connector A73 and D6 of the main body ECM (multiplex network body ECM).
(2) Disconnect the connector 3A, 3B, and 3C of instrument panel junction block ASSY.
NG
>Repair or replacement of the harnesses or connectors
OK▼
2.
Inspect the instrument panel junction block ASSY unit.
(1) Remove the instrument panel junction block ASSY.
(2) Remove the main body ECM (multiplex network body ECM) from the instrument panel junction block ASSY.
NG
>Replacement of the instrument panel junction block ASSY
OK▼
3.
Check the harness and connector (main body ECM (multiplex network body ECM) - ECM).
(1) Disconnect the connector A73 of the main body ECM (multiplex network body ECM).
(2) Disconnect the A35 and A36 ECM connector.
NG
>Repair or replacement of the harnesses or connectors
OK▼
4.
Replacement of the ECM
(1) Temporarily replace the ECM with new one or one that is functioning properly.
(2) Register the ECM communication ID (Refer to the REGISTRATION MANUAL FOR IMMOBILIZER).
Next▼
5.
DTC check
(1) Turn IG to ON and wait for 5 seconds.
(2) Check the DTC. (Refer to )
)Criteria
: DTC B1572 is not output.
NG
>Replacement of main body ECM (multiplex network body ECM)
OK▼
END (faulty ECM)
| DTC | B1576 | EGI unit EEPROM |
|---|
Circuit description
Inspection steps
CAUTION:
·The engine immobilizer system uses the CAN communication system. First, following the “How to troubleshoot”, check that no malfunction is present in the communication system before proceeding with troubleshooting.
·When replacing the ECM, refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
·When replacing the ECM, refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
1.
Registration of ECM ID codes (ECM - main body ECM (multiplex network body ECM))
(1) Register ECM ID codes. (Refer to the “immobilizer registration manual”)
Criteria
: You can register ECM ID codes.
NG
> Go to Step 2.
OK▼
Complete
2.
Registration of ECM ID codes (ECM - main body ECM (multiplex network body ECM))
(1) Register ECM ID codes. (Refer to the “immobilizer registration manual”)
Criteria
: You can register ECM ID codes.
NG
> Go to Step 3.
OK▼
Complete
3.
Registration of ECM ID codes (ECM - main body ECM (multiplex network body ECM))
(1) Register ECM ID codes. (Refer to the “immobilizer registration manual”)
Criteria
: You can register ECM ID codes.
NG
>Replacement of the ECM
OK▼
Complete
| DTC | B1577 | Immobilizer unit EEPROM |
|---|
Circuit description
The ECM outputs this code if an internal fault is detected in the main body ECM (multiplex network body ECM) or it can not access ROM inside the main body ECM (multiplex network body ECM).
| DTC NO. |
DTC detecting condition |
Inspection parts |
|---|---|---|
| B1577 |
·Internal fault of main body ECM (multiplex network body ECM) ·When inaccessible to ROM in main body ECM (multiplex network body ECM) |
Main body ECM (multiplex network body ECM) |
Inspection steps
CAUTION:
·The engine immobilizer system uses the CAN communication system. First, following the “How to troubleshoot”, check that no malfunction is present in the communication system before proceeding with troubleshooting.
·When replacing the main body ECM (multiplex network body ECM), refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
·When replacing the main body ECM (multiplex network body ECM), refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
1.
Registration of ECM ID codes (Main body ECM (multiplex network body ECM) - ECM)
(1) Register ECM ID codes. (Refer to the “immobilizer registration manual”)
Criteria
: You can register ECM ID codes.
NG
> Go to Step 2.
OK▼
Complete
2.
Registration of ECM ID codes (Main body ECM (multiplex network body ECM) - ECM)
(1) Register ECM ID codes. (Refer to the “immobilizer registration manual”)
Criteria
: You can register ECM ID codes.
NG
> Go to Step 3.
OK▼
Complete
3.
Registration of ECM ID codes (Main body ECM (multiplex network body ECM) - ECM)
(1) Register ECM ID codes. (Refer to the “immobilizer registration manual”)
Criteria
: You can register ECM ID codes.
NG
>Replacement of main body ECM (multiplex network body ECM)
OK▼
Complete
| DTC | B1578 | Meter abnormal |
|---|
Circuit description
The ECM outputs this code if a reference code incompatibility is detected between the combination meter ASSY or the transponder key ECM ASSY and the main body ECM (multiplex network body ECM), or a communication error is detected between the main body ECM (multiplex network body ECM) and the ECM.
| DTC NO. |
DTC detecting condition |
Inspection parts |
|---|---|---|
| B1578 |
·Reference code incompatible between combination meter ASSY or transponder key ECM ASSY and main body ECM (multiplex network body ECM) ·When communication error between main body ECM (multiplex network body ECM) and ECM occurs |
·Harness or connector ·ECM ·Instrument panel junction block ASSY ·Main body ECM (multiplex network body ECM) |
Circuit figure
Inspection steps
CAUTION:
·The engine immobilizer system uses the CAN communication system. First, following the “How to troubleshoot”, check that no malfunction is present in the communication system before proceeding with troubleshooting.
·When replacing the main body ECM (multiplex network body ECM) or ECM, refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
·Before performing the following inspection steps, check the fuses related to this system.
·When replacing the main body ECM (multiplex network body ECM) or ECM, refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
·Before performing the following inspection steps, check the fuses related to this system.
1.
DTC check
(1) Check the DTC. (Refer to )
)
Criteria
: DTC B1401, B1405, B1406, B1407, B1408, and B1409 are not output.
NG
>To the list of diagnostic codes (Refer to )
)OK▼
2.
Check the harness and connector (battery, body, GND-output short).
(1) Disconnect the connector A73 and D6 of the main body ECM (multiplex network body ECM).
(2) Disconnect the connector 3A, 3B, and 3C of instrument panel junction block ASSY.
NG
>Repair or replacement of the harnesses or connectors
OK▼
3.
Unit inspection of the instrument panel junction block ASSY.
(1) Remove the instrument panel junction block ASSY.
(2) Remove the main body ECM (multiplex network body ECM) from the instrument panel junction block ASSY.
NG
>Replacement of the instrument panel junction block ASSY
OK▼
4.
Check the harness and connector (main body ECM (multiplex network body ECM) - ECM).
(1) Disconnect the connector A73 of the main body ECM (multiplex network body ECM).
(2) Disconnect the A35 and A36 ECM connector.
NG
>Repair or replacement of the harnesses or connectors
OK▼
5.
Replacement of the ECM
(1) Temporarily replace the ECM with new one or one that is functioning properly.
(2) Register the ECM communication ID. (Refer to the “immobilizer registration manual”)
Next▼
6.
DTC check
(1) Check the DTC. (Refer to )
)Criteria
: The diagnostic code B1578 is not output.
NG
>Replacement of main body ECM (multiplex network body ECM)
OK▼
Complete
| Security indicator does not blink |
|---|
Circuit description
When the immobilizer function is set, the main body ECM (network gateway computer) makes the security indicator light in the combination meter ASSY blink.
Circuit figure
Inspection steps
CAUTION:
·The engine immobilizer system uses the CAN communication system. First, following the “How to troubleshoot”, check that no malfunction is present in the communication system before proceeding with troubleshooting.
·When replacing the combination meter ASSY and the main body ECM (multiplex network body ECM), refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
·When replacing the combination meter ASSY and the main body ECM (multiplex network body ECM), refer to the REGISTRATION MANUAL FOR IMMOBILIZER.
1.
DTC check
(1) Check DTC using SSM3. (Refer to )
)
Criteria
: Diagnostic code is not output.
NG
>To the list of diagnostic codes (Refer to )
)OK▼
2.
Implementation of the SSM3 active test (security indicator)
(1) Use the SSM3 to perform the active test, and check that the security indicator light lights up. (Refer to )
)
SSM3 screen: [Each System Check]→ [Integ. unit mode]→ [Work Support]→ [System Operation Check Mode]
| Item |
Drive |
|---|---|
| [Security Indicator] |
Output/stop |
Criteria
: The security indicator light lights up / turns off.
NG
> Go to Step 6.
OK▼
3.
Reading SSM3 data (I[Ignition], [Key Unlock Warning SW])
(1) Using the SSM3, follow the screen display and read the data monitor. (Refer to )
)SSM3 screen: [Each System Check]→ [Integ. unit mode]→ [Current Data Display & Save]
| Item Name |
Description/display range |
Normal value |
Remarks |
|---|---|---|---|
| [Ignition] |
The ignition switch status is displayed. Display range: [ON]/[OFF] |
[ON]: IG ON [OFF]: IG OFF |
- |
| [Key Unlock Warning SW] |
Status of the unlock warning switch Display range: [ON]/[OFF] |
[ON]: The key is in the ignition key cylinder. [OFF]: The key is not in the ignition key cylinder. |
- |
Criteria
: The data monitor value is normal.
B
>To lighting system (interior) (IG signal circuit) (Refer to )
)C
> Go to Step 4.
A▼
Replacement of the main body ECM (network gateway computer) (Refer to )
)4.
Unit inspection of the unlock warning switch ASSY
(1) Remove the unlock warning switch ASSY. (Refer to )
)(2) Perform the unit inspection of the unlock warning switch ASSY. (Refer to )
)NG
>Replacement of the unlock warning switch ASSY (Refer to )
)OK▼
5.
Inspection of the wire harnesses and connectors (unlock warning switch ASSY - main body ECM (network gateway computer))
(1) Disconnect connector D5 of the main body ECM (network gateway computer).
NG
>Repair or replacement of wiring harness or connector
OK▼
Replacement of the main body ECM (Network gateway computer)
6.
Inspection of the wiring harnesses and the connectors (instrument panel junction block ASSY - combination meter ASSY)
(1) Disconnect the connector 3B of the instrument panel junction block ASSY.
(2) Disconnect connector D7 of the combination meter ASSY.
NG
>Repair or replacement of wiring harness or connector
OK▼
7.
Unit inspection of the instrument panel junction block ASSY.
(1) Remove the main body ECM (network gateway computer) from the instrument panel junction block ASSY.
NG
>Replacement of the instrument panel junction block ASSY
OK▼
8.
Replacement of combination meter ASSY
(1) Replace with a new or normal combination meter ASSY. (Refer to )
)(2) When the immobilizer is set, check that the security indicator light flashes.
Criteria
: The security indicator light flashes
NG
>Replacement of the main body ECM (Network gateway computer)
OK▼
Complete (Faulty combination meter ASSY)