Inspection Procedure N-7: The door-ajar warning lamp does not illuminate/extinguish normally.


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.


COMMENTS ON TROUBLE SYMPTOM
If the door-ajar warning lamp does not work normally, these input signal circuits or the ETACS-ECU may be defective.

POSSIBLE CAUSES

  • The combination meter may be defective
  • The ETACS-ECU may be defective
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the door lamp.
When the door is opened or closed, check that the door lamp illuminate/go off normally.

Q. Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure N-5 "The door lamp illuminate normally ."

Step 2. M.U.T.-III CAN bus diagnostics.
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 3.
Repair the CAN bus line (Refer to GROUP 54F - Diagnosis ).

Step 3. Check for combination meter diagnosis code.
Check whether the combination meter-related diagnosis code is set.

Q. Is the diagnosis code set?
Diagnose the combination meter (Refer to GROUP 54A - Troubleshooting ).
Go to Step 4.

Step 4. Check the power supply circuit.
When the ignition switch is turned to the LOCK (OFF) position, check if the hazard warning lamps illuminate.

Q. Is the check result normal?
Go to Step 5.
Refer to Inspection Procedure A-2 "When the ignition switch is at the LOCK (OFF) position, the functions do not work normally. Check the battery power supply circuit to the ETACS-ECU ."

Step 5. Pulse check
Check the input signals below, which are related to the door-ajar warning lamp.
System switch
 Check conditions
Ignition switch (IG1)
 When turned from ACC to ON
Driver’s door switch
 Driver’s door opened
Passenger’s door switch
 Passenger’s door opened
Rear door (RH) switch
 Rear door (RH) opened
Rear door (LH) switch
 Rear door (LH) opened
Tailgate switch
 A tailgate opened
Vehicle speed signal
 When the vehicle speed has reached 10 km/h or more
OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Are the check result normal?
All the signals are received normally. : Go to Step 6.
The ignition switch (IG1) signal is not received. : Refer to Inspection Procedure P-2 "The ignition switch (IG1) signal is not received" .
Driver’s door switch signals are not received. : Refer to Inspection Procedure P-4 "The driver’s door switch signal is not received ."
Passenger’s door, rear doors switch or tailgate switch signals are not received. : Refer to Inspection Procedure P-12 "All the door switch signals are not received ."
The vehicle speed signal is not received. : Refer to Inspection Procedure P-22 "The vehicle speed signal is not received ."

Step 6. M.U.T.-III actuator test
Perform the actuator test for the combination meter, and check that the door-ajar warning lamp illuminates (Refer to GROUP 54A - Combination Meter ).

Q. Is the check result normal?
Replace the ETACS-ECU.
Replace the combination meter.