Inspection Procedure O-2: The room lamp does not illuminate normally.

caution

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

COMMENTS ON TROUBLE SYMPTOM

If the room lamp does not illuminate or extinguish normally, wiring harness connector(s) or the bulb may be defective.

POSSIBLE CAUSES

Malfunction of the interior lamp switches
Malfunction of the room lamp bulbs
Malfunction of the rear personal lamp bulbs
Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Pulse check

Check the input signals below, which are related to the room lamp.

System switch	Check condition
Driver’s door switch	Driver’s door is opened while all the other doors are closed.
Passenger’s door switch	Passenger’s door is opened while all the other doors are closed.
Rear door (RH) switch	Rear door (RH) is opened while all the other doors are closed
Rear door (LH) switch	Rear door (LH) door is opened while all the other doors are closed
Tailgate switch	Tailgate is opened while all the other doors are closed
Driver’s door lock actuator switch	When the driver’s door is unlocked or locked
Interior lamp ON switch	When turned from OFF to ON
Interior lamp OFF switch	When turned from ON to OFF

OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Are the check result normal?

	All the door switch signals are not received. : Refer to inspection procedure P-12 "All the door switch signals are not received ."

	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> or <RH drive vehicles> ."

	The interior lamp switch signal is not received. : Refer to inspection procedure P-20 "The interior lamp "all on" or "all off" switch signal is not sent to the ETACS-ECU ."

Step 2. Retest the system.

Check that the right or left room lamp illuminates when the interior lamp switch is operated.

Q. Is the check result normal?

	Go to Step 5.

	Go to Step 3.

Step 3. Connector check: C-219 ETACS-ECU connector, E-02 room lamp connector

Q. Is the check result normal?

Go to Step 4.

Repair the defective connector.

Step 4. Check the wiring harness from C-219 ETACS-ECU connector terminal No.6 to E-02 room lamp connector terminal No.10.

note

Prior to the wiring harness inspection, check intermediate connector E-11 and junction block connector C-211, and repair if necessary.

Check the power supply line for open circuit.

Q. Is the check result normal?

Replace the room lamp.

Repair the wiring harness.

Step 5. Check the room lamp switch.

Check which position (ON or DOOR) of the room lamp switch does not activate the room lamp.

Q. Which switch position does not activate the lamp?

	The lamp illuminates at neither the ON nor DOOR position. : Go to Step 6.

	The lamp does not illuminate at the ON position. : Go to Step 6.

	The lamp does not illuminate at the DOOR position. : Go to Step 8.

Step 6. Connector check: E-02 room lamp connector

Q. Is the check result normal?

Go to Step 7.

Repair the defective connector.

Step 7. Check the bulbs of the room lamp.

Check that the room lamp bulbs are not burned out.

Q. Is the check result normal?

	Replace the room lamp.

	Replace the room lamp bulb.

Step 8. Connector check: E-02 room lamp connector

Q. Is the check result normal?

Go to Step 9.

Repair the defective connector.

Step 9. Check the bulbs of the room lamp.

Check that the room lamp bulbs are not burned out.

Q. Is the check result normal?

	Go to Step 10.

	Replace the room lamp bulb.

Step 10. Check the wiring harness from C-219 ETACS-ECU connector terminal No.5 to E-02 room lamp connector terminal No.8.

note

Prior to the wiring harness inspection, check intermediate connector E-11 and junction block connector C-211, and repair if necessary.

Check the earth wires for open circuit.

Q. Is the check result normal?

Replace the room lamp.

Repair the wiring harness.