Key warning system
Parts location System information Troubleshooting Circuit diagnosis Removal / installation
DOOR LOCK
KEY WARNING SYSTEM
PARTS LOCATION
SYSTEM DIAGRAM
DESCRIPTION OF FUNCTIONS
1. Details of key warning system
(1) If the driver’s door is opened with the ignition key at ACC or lock position, the key warning buzzer sounds to alert the driver to the key left inserted.
HOW TO TROUBLESHOOT
NOTE:
·Using the following procedures, perform the key warning system troubleshooting.
·*: Use the SSM3.
·*: Use the SSM3.
1.
Bring in the car
Next▼
2.
Check battery voltage
(1) Inspect the battery voltage.
Standard voltage
: 11 to 14 V
NOTE:
If the voltage is 11 V or less, charge or replace the battery before proceeding to a next step.
Next▼
3.
CAN communication system check
(1) Check CAN communication system. (Refer to 
)
)
Result
| Result |
Go to |
|---|---|
| Functioning properly |
A |
| Not functioning properly |
B |
B
>Go to “CAN communication system (How to troubleshoot)” (Refer to ).
).A▼
4.
Symptom table
Result
| Result |
Go to |
|---|---|
| No trouble is indicated in check list for interview |
A |
| A trouble is indicated in check list for interview |
B |
B
>Go to Step 6.
A▼
5.
General analysis and troubleshooting *
(1) ECM terminals (Refer to )
)(2) [Current Data Display & Save] / [System Operation Check mode] (Refer to )
)Next▼
6.
Repair or replace
Next▼
7.
Confirmation test
Next▼
Complete
OPERATION CHECK
1. Function inspection
(1) Check that the key warning buzzer sounds.
(a) Insert a key in the ignition key cylinder with the driver’s door closed and turn the key to the lock position or ACC.
(b) Check that the buzzer sounds periodically when the driver’s door is opened.
(2) Check that the key warning buzzer stops sounding.
(a) Check that the buzzer stops sounding if the following operations are performed while the buzzer is sounding:
·Driver’s door is closed. (Front door courtesy light switch is OFF)
·Turn IG SW to ON.
·Remove the key from the ignition key cylinder.
·Turn IG SW to ON.
·Remove the key from the ignition key cylinder.
CUSTOMIZE FUNCTION
1. Customization of key warning system
(1) Customization via SSM3
CAUTION:
·When a customer requests a function change, check if the function is customizable.
·Before starting customization, record the current settings.
·Before performing the troubleshooting procedure for a function, check that the function is set to the initial settings.
·Before starting customization, record the current settings.
·Before performing the troubleshooting procedure for a function, check that the function is set to the initial settings.
NOTE:
The items below are customizable.
(a) Connect the SSM3 to the DLC3.
(b) Turn IG SW to ON.
(c) Turn on the SSM3.
(d) Enter the following menus. [Integ. unit mode]→[Unit customizing]
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.
Key warning system
| Symptoms |
Faulty part |
Reference pages |
|---|---|---|
| Key reminder buzzer does not sound |
Proceed to “Key reminder buzzer does not sound” |
|
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 connector D5, D6, and A73 of the main body ECM (multiplex network body ECM).
(3) Measure the voltage and resistance according to the following table.
| Terminal No. (symbol) |
Terminal description |
Conditions |
Specified condition |
|---|---|---|---|
| MB-1 - chassis ground |
Battery power supply |
Always |
11 to 14 V |
| MB-8 - chassis ground |
IG SW power supply |
IG SW ON |
11 to 14 V |
| IG SW OFF |
1 V or less |
||
| MB-9 - chassis ground |
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 |
Battery power supply |
Always |
11 to 14 V |
| D5-22 - chassis ground |
Unlock warning switch input |
Key is not inserted in 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.
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 using the SSM3 for reading the data list, it is able to read the values and the status of the switches, sensors, or actuators without removing these 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) Turn IG SW to OFF.
(2) Connect the SSM3 to the DLC3.
(3) Turn IG SW to ON.
(4) Turn on the SSM3.
(5) Enter the following menus. [Integ. unit mode] → [Current Data Display & Save]
(6) Using SSM3, read the data list according to the screen displays.
Main body
| Item Name |
Description/display range |
Normal condition |
Remarks |
|---|---|---|---|
| [Ignition] |
Ignition switch signal / ON or OFF |
OFF:IG SW OFF ON:IG SW ON |
- |
| [ACC SW] |
Ignition switch ACC signal / ON or OFF |
OFF:IG SW OFF ON:IG SW ACC |
- |
| [Key Unlock Warning SW] |
Unlock warning switch / OFF or ON |
OFF: Ignition key is not inserted ON: Ignition key is inserted |
- |
| [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 |
- |
| Key reminder buzzer does not sound |
|---|
Description of functions
If the driver’s door is opened while the ignition switch is set at the lock position or ACC, the key reminder warning buzzer sounds. When the main body ECM (multiplex network body computer) transmits a key switch signal and driver’s courtesy light switch signal to the combination meter ASSY, the key reminder warning buzzer operates.
Circuit figure
Inspection steps
NOTE:
Because the key warning system includes functions that use CAN communication, first check if any problem is present in the CAN communication function according to “How to troubleshoot”. Next, perform the following troubleshooting procedure.
1.
Reading values with SSM3 (front door courtesy light switch)
(1) Connect the SSM3 to the DLC3.
(2) Turn IG SW to ON.
(3) Turn on the SSM3.
(4) Enter the following menus. [Integ. unit mode] → [Current Data Display & Save]
(5) Using SSM3, read the data list according to the screen displays.
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 |
- |
Criteria
: When the unlock warning switch is operated, the display is changed as indicated in the table
NG
>To Lighting system (Door courtesy light switch circuit) (Refer to )
)OK▼
2.
Reading values with SSM3 (key unlock warning switch)
(1) Connect the SSM3 to the DLC3.
(2) Turn IG SW to ON.
(3) Turn on the SSM3.
(4) Enter the following menus. [Integ. unit mode] → [Current Data Display & Save]
(5) Using SSM3, read the data list according to the screen displays.
Main body
| Item Name |
Description/display range |
Normal value |
Remarks |
|---|---|---|---|
| [Key Unlock Warning SW] |
Unlock warning switch signal / OFF or ON |
OFF: Ignition key is not inserted ON: Ignition key is inserted |
- |
Criteria
: When the unlock warning switch is operated, the display is changed as indicated in the table.
NG
>Go to Step 4.
OK▼
3.
Inspecting combination meter ASSY (buzzer operation)
(1) Remove the key from the key cylinder, turn the light control switch for headlight dimmer switch ASSY to the tail position, and open the driver’s door.
Criteria
: The light warning buzzer sounds
NOTE:
The key warning system sounds the buzzer integrated in the combination meter and activates the lockout prevention function. This buzzer is also used for the light warning system. Therefore, check that the combination meter buzzer operates to alert the user to the light left illuminated.
NG
>Replace the combination meter ASSY
OK▼
Replacement of the main body ECM (multiplex network body ECM)
4.
Inspecting unlock warning switch ASSY
(1) Remove the unlock warning switch ASSY. (Refer to )
)(2) Inspect the unlock warning switch ASSY. (Refer to )
)NG
>Replace the unlock warning switch ASSY (Refer to )
)OK▼
5.
Inspecting wiring harness and connector (main body ECM - unlock warning switch)
(1) Disconnect the unlock warning switch ASSY connector D53.
(2) Disconnect the main body ECM (multiplex network body ECM) connector D5.
(3) Measure the voltage and resistance according to the following table.
Voltage
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| D53-1 - Chassis ground |
Always |
11 to 14 V |
Resistance
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| D53-2 - D5-22 |
Always |
1 Ω or less |
| D53-2 - Chassis ground |
Always |
10 kΩ or more |
Captions in illustration
| *a |
Front side of vehicle wiring harness connector (To unlock warning switch ASSY) |
NG
>Repair or replacement of wiring harness or connector
OK▼
Replacement of the main body ECM (multiplex network body ECM)