Step 1. Check the operation of the room lamp.

Check that the room lamps illuminate and extinguish normally.

Q: Is the check result normal?

YES:  Go to Step 2.
NO:  Refer to Inspection Procedure O-1 "The front or rear room lamp does not illuminate or extinguish <vehicles without keyless entry system> ." Or refer to Inspection Procedure O-2 "The front or rear room lamp does not illuminate or extinguish <vehicles with keyless entry system> ."

Step 2. Pulse check

Check the input signals below, which are related to the ignition key cylinder illumination lamp.

System switch	Check condition
Ignition switch (IG1)	When turned from ACC to ON
Key reminder switch*	When the inserted ignition key is pulled out
Driver's door switch	When the driver's door is opened

NOTE: ^* : Vehicles with keyless entry system

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 ."
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 switch signal is not received.:  Refer to Inspection Procedure P-4 "The driver's door switch signal is not received <LH drive vehicles> ." Refer to Inspection Procedure P-4 "The driver's door switch signal is not received <RH drive vehicles> ."

Step 3. Connector check: C-304 key reminder switch connector

Q: Is the check result normal?

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

Step 4. Check the bulb of the ignition key cylinder illumination lamp.

Check the bulb of the ignition key cylinder illumination lamp.

Q: Is the check result normal?

YES:  Go to Step 5.
NO:  Replace the bulb of the ignition key cylinder illumination lamp.

Step 5. Connector check: C-219 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-219 ETACS-ECU connector terminal Nos.69 and 71 to C-304 ignition key cylinder illumination lamp connector terminal Nos.1 and 2.

• Check the input and output lines for open circuit.

Q: Is the check result normal?

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

Step 7. Retest the system.

Check that the ignition key cylinder illumination lamp illuminates/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.