Wireless door lock control system (with entry & start system)
Precautions Parts location System information Troubleshooting Diagnostic trouble codes Circuit diagnosis Removal / installation
DOOR LOCK
WIRELESS DOOR LOCK CONTROL SYSTEM (WITH ENTRY & START SYSTEM)
PRECAUTIONS
1. Precautions for each function
(1) Precautions for electrical key transmitter SUB-ASSY
The electrical key transmitter SUB-ASSY is a delicate device.
Observe the following precautions in handling the electrical key transmitter SUB-ASSY:
The electrical key transmitter SUB-ASSY is a delicate device.
Observe the following precautions in handling the electrical key transmitter SUB-ASSY:
(a) Do not drop or hit the electrical key transmitter SUB-ASSY.
(b) Do not leave the electrical key transmitter SUB-ASSY in high-temperature locations for a prolonged period of time.
(c) Do not wash the electrical key transmitter SUB-ASSY in an ultrasound bath.
(d) Keep the electrical key transmitter SUB-ASSY away from magnets and magnetized objects.
(e) Do not apply a sticker or the like on the electrical key transmitter SUB-ASSY.
PARTS LOCATION



SYSTEM DIAGRAM
DESCRIPTION OF FUNCTIONS
1. Wireless door lock control system
(1) The wireless door lock control system can be used to lock and unlock all doors from a distant position. This system is controlled by transmitting radio wave signals from the electrical key transmitter SUB-ASSY to the door control receiver. The collation ECM (smart key ECM ASSY) activates the door lock control function after the ID code authentication process.
2. Functions of the main parts
| Components |
Function |
|---|---|
| Electrical key transmitter SUB-ASSY |
It is fitted with the lock, unlock, and trunk open. It transmits low power radio wave signals (recognition code and function code) to the door control receiver. The indicator light (LED) illuminates during transmission. |
| Door control receiver |
It receives low power radio wave signals from the electrical key transmitter SUB-ASSY and transmits them to the collation ECM (smart key ECM ASSY). |
·Front door courtesy light switch LH/RH ·Trunk courtesy light switch |
·It illuminates while the door is open and turns off while the door is closed. ·It detects the door state (open, close) and outputs the data to the main body ECM (multiplex network body computer). |
·Front door lock ASSY LH/RH |
·An integrated motor locks and unlocks the door. ·It transmits the door lock position of each door to the main body ECM (multiplex network body computer). |
| Collation ECM (smart key computer ASSY) |
It transmits wireless door lock control signals in response to the code data of the door control receiver or the signals from each ECM. |
3. System functions
(1) The electrical key transmitter SUB-ASSY is fitted with the lock and unlock switches. By operating these switches, the driver can operate each function. The wireless door lock control system has the following functions.
NOTE:
| Function |
Operation |
|---|---|
| All door lock function |
When the lock switch is pressed, all doors are locked. |
| Driver’s door unlock function |
When the unlock switch is pressed, only the driver’s door is unlocked. |
| All door unlock function (unlock 2 operation) *1 |
The driver’s door is unlocked and then all other doors are unlocked when the unlock switch is pressed twice within 5 seconds. |
| Trunk open function |
When the trunk open switch of the electrical key transmitter SUB-ASSY module set SUB-ASSY is held down for 0.8 second or more, the trunk opens. |
| Answer-back function (hazard warning light) |
It reports the completion of operation by flashing the hazard warning light once when the door is locked or twice when the door is unlocked. |
| Answer-back function (wireless door lock buzzer) *2 |
It reports the completion of operation by sounding the wireless lock buzzer once when the door is locked or twice when the door is unlocked. |
| Door open warning function |
When the lock switch is pressed while a door is open or not closed properly, the buzzer sounds continuously for 10 seconds. The buzzer stops sounding when all doors are closed or the unlock switch is pressed. |
| Auto lock function |
If no door is opened within 30 seconds after the doors are unlocked using the wireless door lock control, all doors are locked automatically. |
| Illumination function |
When the unlock switch is pressed with all doors locked, the room light illuminates simultaneously with the unlock operation. |
| Self diagnosis function |
In the following conditions, the system transfers to the self diagnosis mode. ·When the door control receiver receives normal radio wave signals from the electrical key transmitter SUB-ASSY while the system is in the self diagnosis mode, the room lamp blinks in a pattern corresponding to each switch. |
| Transmitter identification code registration function |
7 transmitter identification codes can be registered (written and saved) in the EEPROM integrated in the collation ECM (smart key ECM ASSY). |
·*1: With key link switch
·*2: With Wireless lock buzzer answer-back function
·*2: With Wireless lock buzzer answer-back function
HOW TO TROUBLESHOOT
NOTE:
·The troubleshooting procedure for the wireless door lock control system assumes that the power door lock control system is functioning normally. Before performing the troubleshooting procedure for the wireless door lock control system, confirm that the power door lock control system is functioning normally.
·Using the following procedures, perform the wireless door lock control system troubleshooting.
·*: Use the SSM3.
·Using the following procedures, perform the wireless door lock control system troubleshooting.
·*: Use the SSM3.
1.
Bring in the car
Next▼
2.
Check the battery voltage.
Standard voltage
: 11 to 14 V
If the voltage is 11 V or less, charge or replace the battery before proceeding to a next step.
Next▼
3.
Checking DTC*
(2) Clear the diagnostic code.
(3) Recheck each DTC. Based on DTC output in the above steps, simulate the symptom indicated by that DTC so that the same CAN communication system DTC or wireless door lock control system DTC output can be obtained.
Result
| Result |
Go to |
|---|---|
| No DTC is output |
A |
| CAN communication system DTC is output |
B |
| Wireless door lock control system DTC is output |
C |
B
C
A▼
4.
Symptom table
(1) Refer to symptom table (Refer to
)
Result
| Result |
Go to |
|---|---|
| Troubles not indicated in symptom table |
A |
| Troubles indicated in symptom table |
B |
B
>Go to Step 6.
A▼
5.
General analysis and troubleshooting *
Next▼
6.
Repair or replace
Next▼
7.
Confirmation test
Next▼
Complete
OPERATION CHECK
1. Take into account the following points when checking.
(1) Wireless door lock/unlock function:
The wireless door lock control function operates only when the following three conditions are met.
The wireless door lock control function operates only when the following three conditions are met.
(a) The engine switch is off.
(b) All doors are closed.
(c) Power door lock system is operating normally.
NOTE:
The unlock function operates even when a door is open.
(2) The operation range of wireless door lock control function varies depending on the situation.
(a) The operation area varies depending on the user and how the electrical key transmitter SUB-ASSY is held.
(b) In some areas, the remote control function may work only in a part of the operation range. This is because the operation range is reduced due to the vehicle shape or surrounding environment.
(c) Because the electrical key transmitter SUB-ASSY uses an extremely low power radio wave, the operation range may be limited or the remote control may not function if a strong radio wave or noises are present in the same frequency band as the electrical key transmitter SUB-ASSY.
(d) If the battery charge level of the electrical key transmitter SUB-ASSY is low, the operation range is reduced and the remote control may not function.
NOTE:
If the electrical key transmitter SUB-ASSY is left under direct sunlight for a long time (for example, left on the meter panel), the battery charge level may decrease or other troubles may occur.
2. Inspecting wireless door lock control function
NOTE:
·The switches outlined in this text are those for transmitting signals. The switches are integrated in the electrical key transmitter SUB-ASSY.
·All the functions listed below must be inspected in relation to the remote control operation range.
·All the functions listed below must be inspected in relation to the remote control operation range.
(1) Confirm that the vehicle is set in an environment where the wireless control function can operate.
(2) Inspect the basic functions.
(a) Check that the transmitter LED illuminates three times or more when the lock switch of the electrical key transmitter SUB-ASSY is held down for 5 seconds or more.
NOTE:
If LED does not illuminate three times or more even when the switch is held down, it is possible that the battery charge level is low.
(b) Check that all doors are locked when the lock switch is pressed.
(c) Check that all doors are unlocked when the unlock switch is pressed.
(3) Check the chattering prevention function.
(a) Check that the relevant operation takes place only once without being repeated while the switch is held down. Check that the relevant operation takes place when the switch is pressed at 1 second intervals.
(4) Check the auto lock function.
(a) Press the unlock switch to unlock all doors. Check that all doors are automatically locked if no door is opened and all doors are not locked within 30 seconds.
(b) Press the unlock switch to unlock all doors. Check that the auto lock function does not operate if any door is opened or all doors are locked within 30 seconds.
(c) Press the unlock switch to unlock all doors. Check that the auto lock function does not operate if all doors are locked manually (for example, by key link operation or by pressing the lock switch) within 30 seconds.
(5) Check the switch operation false recognition prevention function.
(a) Check that all doors are not locked and unlocked by any switch operation with a transmitter not registered but are locked and unlocked by switch operations with a registered transmitter.
(6) Check the door open warning function.
(a) Check that the wireless door lock buzzer sounds continuously for 5 seconds when the lock switch is pressed while a door is open or not closed properly.
(7) Check the answer-back function (hazard warning lights flashing).
(a) Check that the hazard warning light blinks once and all doors are locked simultaneously when the lock switch is pressed.
(b) Check that the hazard warning light blinks twice and all doors are unlocked simultaneously when the unlock switch is pressed.
(8) Check the answer-back (wireless door lock buzzer) function*.
(a) Check that the buzzer sounds once and all doors are locked simultaneously when the lock switch is pressed.
(b) Check that the buzzer sounds twice and the driver’s door is unlocked simultaneously when the unlock switch is pressed.
(c) When the trunk is opened by wireless operation, the wireless door lock buzzer sounds.
*: With wireless door lock buzzer answer-back function
*: With wireless door lock buzzer answer-back function
(9) Check the entry illumination function.
(a) Check that the map light illuminates (if the light switch is set to the door position) and all doors are unlocked when the unlock switch is pressed with all doors locked.
CUSTOMIZE FUNCTION
1. Customization of wireless door lock control system (with entry & start system)
(1) Notes on customization via SSM3
CAUTION:
·When a customer requests a function change, check if the function is customizable.
·Before customization, record the current settings.
·Before performing the troubleshooting procedure for a function, check that the function is set to the initial settings.
·Before customization, record the current settings.
·Before performing the troubleshooting procedure for a function, check that the function is set to the initial settings.
NOTE:
Some items may not be displayed depending on the destination and equipment.
(a) Connect the SSM3 to the DLC3.
(b) Turn the engine switch (IG) to ON.
(c) Turn on the SSM3.
(d) Enter the following menus: [Integ. unit mode] → [Unit customizing]
(e) Referring to the table below, perform settings.
Wireless door lock
| Display name |
Initial setting |
Contents |
Setting |
Controller ECM |
|---|---|---|---|---|
| [Keyless Control] |
Yes |
Settings for the function that allows you to select to lock the door via operation of the electrical key transmitter SUB-ASSY (Electronic key) |
YES or NO |
Main body ECM (multiplex network body ECM) |
| [Wireless Buzzer Resp] |
ON |
Wireless door lock buzzer response |
OFF or ON |
|
| [Hazard Answer Back] |
ON |
When the wireless lock switch of the transmitter is pressed, all hazard warning lights are illuminated simultaneously. All hazard warning lights illuminate twice when the unlock switch is pressed. |
OFF or ON |
|
| [Open Door Warning] |
ON |
The buzzer sounds when the lock is pressed while any door is open. |
OFF or ON |
|
| [Unlocking operation] |
Yes |
Settings for the function where all doors are unlocked when the electrical key transmitter SUB-ASSY (Electronic key) is operated twice |
YES or NO |
|
| [Auto Lock Time] |
30 second |
This function controls the time from unlocking all doors until the activation of auto lock function. |
30 seconds, 60 seconds, 120 seconds |
|
| [Trunk lid unlocking operation] |
Long press(short) |
Settings for the method of operation when opening the trunk with the electrical key transmitter SUB-ASSY (Electronic Key) |
Push and hold (long)/One short push/Two short Pushes/Push and hold (short) |
|
| [Wireless Buzzer Volume] |
Level 5 |
Wireless door lock buzzer volume |
Level 7, Level 6, Level 5,Level 4, Level 3, Level 2, Level 1, or Level 0 |
SYMPTOM TABLE
NOTE:
·Use the following table to identify the cause of the symptom. If multiple areas are listed as the causes, they are indicated in the [Faulty part] column according to the order of probability of causing the symptom. Check the possible causal areas in the list order and confirm each symptom. Replace faulty parts as necessary.
·Before inspecting the areas listed in “Possible cause” below, check the fuses and the relays related to this system.
·Before inspecting the areas listed in “Possible cause” below, check the fuses and the relays related to this system.
Wireless door lock control system
ECM TERMINAL ARRANGEMENT
1. Check the instrument panel junction block ASSY and 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 main body ECM (multiplex network body computer) connectors D6 and A73.
(3) Measure the resistance and voltage based on the following table.
| Terminal No. (symbol) |
Terminal description |
Conditions |
Specified condition |
|---|---|---|---|
| MB-11 - chassis ground |
Ground |
Always |
1 Ω or less |
| MB-1 - chassis ground |
Battery power supply |
Always |
11 to 14 V |
| MB-32 - chassis ground |
Battery power supply |
Always |
11 to 14 V |
| MB-8 - chassis ground |
Engine switch power supply |
Engine switch ON |
11 to 14 V |
| Engine switch OFF |
1 V or less |
||
| MB-9 - chassis ground |
ACC power supply |
Engine switch ACC |
11 to 14 V |
| Engine switch OFF |
1 V or less |
||
| D6-1 - Chassis ground |
Ground |
Always |
1 Ω or less |
| A73-4 - chassis ground |
Ground |
Always |
1 Ω or less |
(4) Connect the main body ECM (multiplex network body computer) connectors D6 and A73.
(5) Install the main body ECM (multiplex network body ECM) to the instrument panel junction block ASSY.
(6) Measure the voltages and pulses according to the values indicated in the table below.
| Terminal No. (symbol) |
Terminal description |
Conditions |
Specified condition |
|---|---|---|---|
| 3A-28 - chassis ground |
Driver’s side courtesy light switch |
Driver’s door is open. |
1 V or less |
| Driver’s door is closed |
Pulse generation |
||
| 3B-13 - chassis ground |
Passenger’s side courtesy light switch |
The passenger’s door is open. |
1 V or less |
| The passenger’s door is closed. |
Pulse generation |
||
| 3D-26 - chassis ground |
Trunk courtesy light switch |
The trunk is open. |
1 V or less |
| The trunk is closed. |
11 to 14 V |
||
| 3B-2 - chassis ground |
Door lock motor lock drive output |
Door control switch is not pressed |
1 V or less |
| Lock side of door control switch is not pressed |
11 to 14 V |
||
| 3B-3 - chassis ground |
Door lock motor lock drive output |
Door control switch is not pressed |
1 V or less |
| Lock side of door control switch is not pressed |
11 to 14 V |
||
| 3B-6 - chassis ground |
Door lock motor lock drive output (trunk) |
The trunk open button on the electrical key transmitter SUB-ASSY is not pressed. |
11 to 14 V |
| The trunk open button on the electrical key transmitter SUB-ASSY is pressed. |
1 V or less |
||
| 3B-1 - chassis ground |
Door lock motor unlock drive output |
Door control switch is not pressed |
1 V or less |
| Unlock side of door control switch is not pressed |
11 to 14 V |
||
| 3B-4 - chassis ground |
Door lock motor unlock drive output |
Door control switch is not pressed |
1 V or less |
| Unlock side of door control switch is not pressed |
11 to 14 V |
||
| D6-11 - Chassis ground |
Driver’s door unlock detection switch input |
The driver’s door is locked. |
1 V or less |
| Engine switch is OFF, all doors are closed, and driver’s door is locked |
Pulse generation |
||
| D6-12 - Chassis ground |
Driver’s door unlock detection switch input |
Passenger’s door is unlocked |
1 V or less |
| Engine switch OFF, all doors closed, and passenger’s door locked |
Pulse generation |
2. Check the collation ECM (smart key computer ASSY).

(1) Remove the D48 connector of the collation ECM (smart key ECM ASSY).
(2) Measure the voltage and resistance according to the following table.
NOTE:
Measure the wire harness side values with the connector disconnected.
| Terminal No. (symbol) |
Terminal description |
Conditions |
Specified condition |
|---|---|---|---|
| D48-2 - D48-11 |
+B power supply |
Always |
11 to 14 V |
| D48-11 - Chassis ground |
Ground |
Always |
1 Ω or less |
If you cannot get the specified result, there could be a problem in the wiring harnesses.
(3) Reconnect the D48 connector of the collation ECM (smart key ECM ASSY).
(4) Measure the voltage according to the following table.
| Terminal No. (symbol) |
Terminal description |
Conditions |
Specified condition |
|---|---|---|---|
| D41-5 - D48-11 |
IG power supply |
Engine switch OFF → ON (IG) |
1V or less → 11 to 14V |
| D40-5 - D48-11 |
Entry door control receiver power source |
Engine switch OFF, all doors closed, electrical key transmitter SUB-ASSY switch not pressed → Electrical key transmitter SUB-ASSY switch is pressed |
1 V or less → 4.5 to 5.5 V |
| D40-17 - D48-11 |
Entry door control receiver data input signal |
Engine switch OFF, all doors closed, electrical key transmitter SUB-ASSY switch not pressed → Electrical key transmitter SUB-ASSY switch is pressed |
11 to 14 V pulse generates at equal intervals |
| D40-19 - D48-11 |
Entry door control receiver radio wave signal present |
All doors locked, all doors closed, electrical key switch ON |
11 to 14 V → 2V or less |
3. Inspect the door control receiver.
(1) Disconnect the door control receiver connector H26.
(2) Measure the resistance according to the following table.
| Terminal No. (symbol) |
Terminal description |
Conditions |
Specified condition |
|---|---|---|---|
| H26-1 - Chassis ground |
Ground |
Always |
1 Ω or less |
(3) Reconnect the H26 door control receiver connector.
(4) Measure the voltage according to the following table.
| Terminal No. (symbol) |
Terminal description |
Conditions |
Specified condition |
|---|---|---|---|
| H26-2 - H26-1 |
Entry door control receiver radio wave signal present |
All doors locked, all doors closed, electrical key switch ON |
11 to 14 V → 2 V or less |
| H26-5 - H26-1 |
Entry door control receiver data input signal |
Engine switch OFF |
11 to 14 V pulse generates at equal intervals |
| H26-4 - H26-1 |
Entry door control receiver power source |
Engine switch OFF, all doors closed, electrical key transmitter SUB-ASSY switch not pressed → Electrical key transmitter SUB-ASSY switch is pressed |
1 V or less → 4.5 to 5.5 V |
CHECKING / CLEARING DIAGNOSTIC CODES
1. Check DTC
(1) Connect the SSM3 to the DLC3.
(2) Turn the engine switch (IG) to ON.
(3) Turn on the SSM3.
(4) Enter the following menus: [Integ. unit mode] → [Diagnostic Code(s) Display]
(5) Check the DTC.
2. Clear the DTC.
(1) Connect the SSM3 to the DLC3.
(2) Turn the engine switch (IG) to ON.
(3) Turn on the SSM3.
(4) Enter the following menus: [Integ. unit mode] → [Clear Memory]
(5) Clear DTC according to the following instructions displayed on the SSM3 screen.
CURRENT DATA DISPLAY & SAVE / SYSTEM OPERATION CHECK MODE
1. Read data list
CAUTION:
The values indicated under the normal conditions in the table below are informative values. Do not depend on reference value only when judging if the part is faulty.
NOTE:
By reading [Current Data Display & Save] on SSM3, you can check the values and status of switches, sensors, actuators and other items without removing any parts. This inspection is very useful because it allows an operator to read any intermittent conditions or signals without disturbing parts or wiring. By reading the current data display & save information at an initial phase of troubleshooting, you can save time for diagnosis.
(1) Connect the SSM3 to the DLC3.
(2) Turn the engine switch (IG) to ON.
(3) Turn on the SSM3.
(4) Enter the following menus: [Integ. unit mode] → [Current Data Display & Save] or [Keyless access system] → [Collation ECM] → [Current Data Display & Save].
(5) Based on the display contents of SSM3, read the current data display & save.
Main body
| Item Name |
Description/display range |
Normal value |
Remarks |
|---|---|---|---|
| [D Door Courtesy] |
Driver’s door courtesy light switch signal / ON or OFF |
ON: Driver’s door is closed OFF: Driver’s door is open |
- |
| [D Door Lock Pos] |
Driver’s door unlock detection switch signal/Lock or Unlock |
Lock: Driver’s door is closed Unlock: Driver’s door is locked |
- |
| [P Door Courtesy] |
Passenger’s door courtesy light switch signal / ON or OFF |
ON: Passenger’s door is closed OFF: Passenger’s door is open |
- |
| [P Door Lock Pos] |
Passenger’s door unlock detection switch signal/Lock or Unlock |
Lock: Passenger’s door is closed Unlock: Passenger’s door is locked |
- |
| [Luggage Courtesy SW] |
Trunk courtesy switch signal / OFF or ON |
OFF: Trunk is closed ON: Trunk is open |
- |
| [Ignition] |
Engine switch IG signal / ON or OFF |
[ON]: Engine switch is ON (IG). OFF: Engine switch OFF |
- |
| [ACC SW] |
Engine switch ACC signal / ON or OFF |
ON: Engine switch is ON (ACC). OFF: Engine switch OFF |
- |
| [Incorrect ROL code] |
Status of different rolling code / NO or YES |
No: Key rolling code matches vehicle Yes: Key rolling code does not match vehicle |
- |
| [Incorrect ID code] |
Status of different ID code / NO or YES |
No: Key ID code matches vehicle Yes: Key ID code does not match vehicle |
- |
2. Perform system operation check mode
NOTE:
By performing active tests with SSM3, you can operate relays, VSV, actuators and other devices without removing any parts. This functional inspection method is very useful because it helps check state-related signals and identify the faulty part without removing any parts and wiring. By performing active tests at an initial phase of troubleshooting, you can save time for diagnosis. The current data display & save information can be displayed during system operation check mode.
(1) Connect the SSM3 to the DLC3.
(2) Turn the engine switch (IG) to ON.
(3) Turn on the SSM3.
(4) Enter the following menu items: [Integ. unit mode] → [Work Support] → [System Operation Check Mode].
LIST OF DIAGNOSTIC CODES
NOTE:
·If a DTC is displayed during DTC check, inspect the problem point represented by that code. For details on the code, refer to “Reference page” in the DTC chart.
·Before performing a troubleshooting indicated in the table below, inspect the fuses and relays.
·Before performing a troubleshooting indicated in the table below, inspect the fuses and relays.
Wireless door lock control system
| Diagnostic codes |
Diagnostic items |
Faulty part |
Reference pages |
|---|---|---|---|
| B1242 |
[Wireless Door Lock Tuner Circuit] |
Door control receiver wiring harness or connector Collation ECM (smart key computer ASSY) |
|
| DTC | B1242 | Malfunctions in wireless tuner system |
|---|
Circuit description
The door control receiver is used to receive radio wave signals related to the entry function of the entry & start system. The collation ECM (smart key ECM ASSY) decodes the requested entry & start system operation by identifying the key code based on the radio wave signal received via the door control receiver. The door control receiver receives signals from the electrical key transmitter SUB-ASSY and transmits them to the main body ECM via the collation ECM (smart key ECM ASSY). Then, collation ECM (smart key ECM ASSY) transmits a command corresponding to the requested operation to each ECM. (Example: If a door lock operation is requested, the collation ECM (smart key ECM ASSY) transmits the door lock command to the main body ECM. )
| DTC NO. |
DTC detecting condition |
Inspection parts |
|---|---|---|
| B1242 |
When the IGN is OFF and the RC0 (12 V) output from ECM is OFF, short RDA or RSSI to a ground |
·Door control receiver ·Wiring harness or connector ·Collation ECM (smart key computer ASSY) |
Circuit figure

Inspection steps
CAUTION:
·The entry & start system uses multiplex communication. Before performing a troubleshooting, perform checks in the “How to troubleshoot” and check that no communication error is present. (Refer to
)
·Before replacing the collation ECM (smart key ECM ASSY), refer to the entry & start system (entry function).
·When inspecting or replacing the door control receiver or wiring harness, do not change the position or length of the wiring harness. A wiring harness too close to the door control receiver may affect the entry and wireless functions.
·Before replacing the collation ECM (smart key ECM ASSY), refer to the entry & start system (entry function).
·When inspecting or replacing the door control receiver or wiring harness, do not change the position or length of the wiring harness. A wiring harness too close to the door control receiver may affect the entry and wireless functions.
1.
Unit inspection of the collation ECM (smart key ECM ASSY)
(1) Disconnect the door control receiver connector H26.
(2) Measure the resistance and voltage based on the following table.
Resistance
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| H26-1 - Chassis ground |
Always |
1 Ω or less |
Voltage
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| H26-4 - H26-1 |
Always |
1 V or less → 4.5 to 5.5 V (pulse generation) |
| H26-2 - H26-1 |
Always |
11 to 14 V |
| H26-5 - H26-1 |
Always |
11 to 14 V |
Captions in illustration
| *a |
Front side of vehicle wiring harness connector (Door control receiver) |
NG
>Replacing the door control receiver
OK▼
2.
Inspect wiring harness and connector (door control receiver collation ECM (smart key ECM))
(1) Remove the D40 and the D48 connectors of the collation ECM (smart key ECM ASSY).
NG
>Repair or replacement of wiring harness or connector
OK▼
Replace the collation ECM (smart key computer ASSY)
| Answer-back function does not work (hazard + buzzer). |
|---|
Circuit description
In some cases, the hazard warning light and/or the wireless door lock buzzer answer-back function * may not operate even though the wireless door lock control function is normal. In such a case, there may be a fault in the hazard warning light and the wireless door lock buzzer signal output of the main body ECM (multiplex network body ECM).
*: With wireless door lock buzzer answer-back function
Circuit figure

Inspection steps
CAUTION:
The wireless door lock control system uses CAN communication system. First, check that no fault is present in the CAN communication system. Refer to “How to troubleshoot”.
1.
Reading values with SSM3 (answer-back function)
(1) Connect the SSM3 to the DLC3.
(2) Turn the engine switch (IG) to ON.
(3) Turn on the SSM3.
(4) Enter the following menus: [Integ. unit mode] → [Unit customizing]
(5) Referring to the table below, perform settings.
| Display |
Initial setting |
Contents |
Setting |
Controller ECM |
|---|---|---|---|---|
| [Hazard Answer Back] |
ON |
When a door is locked by wireless operation, the hazard warning lights flash once. When a door is unlocked by wireless operation, the hazard warning lights flash twice. |
OFF or ON |
Main body ECM (multiplex network body ECM) |
| [Wireless Buzzer Resp] |
ON |
Wireless door lock buzzer response |
OFF or ON |
Main body ECM (multiplex network body ECM) |
| [Wireless Buzzer Volume] |
Level 5 |
Wireless door lock buzzer volume |
Level 7, Level 6, Level 5,Level 4, Level 3, Level 2, Level 1, or Level 0 |
Main body ECM (multiplex network body ECM) |
·*: With wireless door lock buzzer answer-back function
Result
| Result |
Go to |
|---|---|
| Both items are ON and levels except 0 |
A |
| Both items are OFF or level 0 |
B |
B
>Execute the customize function.
A▼
2.
Inspecting wireless door lock control function
(1) Inspect the wireless door lock control functions using the electrical key transmitter SUB-ASSY.
Result
| Result |
Go to |
|---|---|
| The wireless door lock/unlock functions operate properly. (With wireless door lock buzzer answer-back function) |
A |
| The wireless door lock/unlock functions operate properly. (Without wireless door lock buzzer answer-back function) |
B |
| The wireless door lock/unlock functions do not operate properly. |
C |
B
>Go to Step 10.
C
>To symptom table
A▼
3.
Reading values with SSM3 (door unlock detection switch)
(1) Connect the SSM3 to the DLC3.
(2) Turn the engine switch (IG) to ON.
(3) Turn on the SSM3.
(4) Enter the following menu items: [Integ. unit mode] → [Current Data Display & Save].
(5) Based on the display contents of SSM3, read the current data display & save.
Main body
| Tester display |
Description/display range |
Normal value |
Remarks |
|---|---|---|---|
| [D Door Lock Pos] |
Driver’s door unlock detection switch signal/Lock or Unlock |
Lock: Driver’s door is closed Unlock: Driver’s door is locked |
- |
| [P Door Lock Pos] |
Passenger’s door unlock detection switch signal/Lock or Unlock |
Lock: Passenger’s door is closed Unlock: Passenger’s door is locked |
- |
Criteria
: SSM3 displays the contents corresponding to the door lock operations indicated in the table
NG
>To Lighting system (proceed to door lock detection switch circuit)
OK▼
4.
Checking wireless answer-back operation
B
>Go to Step 10.
A▼
5.
Executing system operation check mode with SSM3 (wireless door lock buzzer)
(1) Connect the SSM3 to the DLC3.
(2) Turn the engine switch (IG) to ON.
(3) Turn on the SSM3.
(4) Enter the following menu items: [Integ. unit mode] → [Work Support] → [System Operation Check Mode].
(5) Based on the display contents of SSM3, read the current data display & save.
Main body
| Tester display |
Tested parts |
Control range |
Remarks |
|---|---|---|---|
| [Wireless Buzzer] |
Wireless door lock buzzer |
OFF/ON |
- |
Result
| Result |
Go to |
|---|---|
| Wireless door lock buzzer do not turn ON/OFF. |
A |
| Wireless door lock buzzer turns ON/OFF. |
B |
NG
>Replacement of the main body ECM (multiplex network body ECM)
OK▼
6.
Inspecting wiring harness and connector (wireless door lock buzzer - main body ECM (multiplex network))
(1) Disconnect the wireless door lock buzzer connector A63 and main body ECM (multiplex network body computer) connector A73.
NG
>Repair or replacement of wiring harness or connector
OK▼
7.
Inspect the meter panel junction block ASSY.
(1) Remove the instrument panel junction block ASSY.


Captions in illustration
| *a |
Connector not connected (Instrument panel junction block ASSY) |
- |
- |
NG
>Replacement of instrument panel junction block ASSY
OK▼
8.
Replacing wireless door lock buzzer
(1) Temporarily replace the wireless door lock buzzer with a new one.
Next▼
9.
Checking wireless door lock buzzer operation
(1) Check the wireless answer-back function operation.
Criteria
: The wireless answer-back function operates properly.
NG
>Replacement of the main body ECM (multiplex network body ECM)
OK▼
END (Wireless door lock buzzer is faulty)
10.
Hazard warning light operation
(1) Check that the hazard warning light blinks when the hazard warning switch is pressed.
Criteria
: Hazard warning light signal is normal
NG
>To Lighting system (proceed to hazard warning switch circuit)
OK▼
Replacement of the main body ECM (multiplex network body ECM)




