Step 1. 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?

YES:  Go to Step 2.
NO:  Refer to Inspection Procedure A-2 "Check the ETACS-ECU battery power supply circuit ."

Step 2. Pulse check

Check the input signals below, which are related to the front and rear room lamps.

System switch	Check condition
Ignition switch (IG1)	When turned from ACC to ON
All of the door switches	A door is opened when all the doors are closed
Driver's door lock actuator switch	When the driver's door is unlocked or locked

OK: The MUT-II/III sounds or the voltmeter needle fluctuates.

Q: Is the check result normal?

All the signals are received normally.:  Go to Step 3.
The ignition switch (IG1) signal is not received.:  Refer to Inspection Procedure P-2 "The ignition switch (IG1) signal is not received ."
All the door switch signals are not received.:  Refer to Inspection Procedure P-12 "All the door switch signals are not received <LH drive vehicles>." Refer to Inspection Procedure P-12 "All the door switch signals are not received <RH drive vehicles>."
The driver's door lock actuator switch signal is not received.:  Refer to Inspection Procedure P-13 "The driver's door lock actuator switch signal is not received <LH drive vehicles>." Refer to Inspection Procedure P-13 "The driver's door lock actuator switch signal is not received <RH drive vehicles>."

Step 3. Connector check: D-05 front room lamp connector, D-11 rear room lamp connector

Q: Is the check result normal?

YES:  Go to Step 4.
NO:  Repair the defective connector.

Step 4. Check the bulbs of the front or rear room lamps.

Check that the front or rear room lamp bulbs are not burned out.

Q: Is the check result normal?

YES:  Go to Step 5.
NO:  Replace the front or rear room lamp bulb.

Step 5. Connector check: C-217 ETACS-ECU connector

Q: Is the check result normal?

YES:  Go to Step 6.
NO:  Repair the defective connector.

Step 6. Check the wiring harness from C-217 ETACS-ECU connector terminal Nos.5 and 6 to D-05 front room lamp connector terminal Nos.2 and 1.

NOTE: Prior to the wiring harness inspection, check junction block connector C-210, and repair if necessary.

Q: Is the check result normal?

YES:  Go to Step 7.
NO:  Repair the wiring harness.

Step 7. Check the wiring harness from C-217 ETACS-ECU connector terminal Nos.5 and 6 to D-11 rear room lamp connector terminal Nos.2 and 1.

NOTE: Prior to the wiring harness inspection, check junction block connector C-210, and repair if necessary.

Q: Is the check result normal?

YES:  Go to Step 8.
NO:  Repair the wiring harness.

Step 8. Retest the system.

Check that the front or rear room lamp illuminates and extinguishes normally.

Q: Is the check result normal?

YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Replace the ETACS-ECU.