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 battery power supply circuit to the ETACS-ECU ."

Step 2. Pulse check

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

System switch	Check conditions
Ignition switch (IG1)	When turned from ACC to ON
All of the door switches	A door is opened when all the doors are closed
Key reminder switch	When the inserted ignition key is pulled out
Driver's door lock actuator switch	When the driver's door is unlocked or locked
Interior lamp loaded signal	When a load is applied through multi-purpose fuse No.18

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

Q: Are 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-13 "All the door switch signals are not received" .
The key reminder switch signal is not received.:  Refer to inspection procedure P-10 "The key reminder switch signal is not received" .
The driver's door lock actuator switch signal is not received.:  Refer to inspection procedure P-14 "The driver's door lock actuator switch signal is not received" .
Interior lamp loaded signal is not detected:  Refer to inspection procedure P-17 "Interior lamp loaded signal is not detected" .

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 connector.

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

Check the bulbs of the front and rear room lamps.

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 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. Check the SWS monitor customized function.

Use the SWS monitor customize function to confirm that "RM LMP TN OFF" is set to other than "W/O FUNCTION".

 CAUTION

The SWS monitor must be used in order to confirm and change that setting. Use the SWS monitor to confirm and/or change the customized function.

Q: Is the check result normal?

YES:  Go to Step 9.
NO:  Use the SWS monitor customize function to set the "RM LMP TN OFF" to other than "W/O FUNCTION" (Refer to GROUP 54C - Adjustment function ).

Step 9. 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.