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

caution

Whenever the ECU is replaced, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

OPERATION

The ETACS-ECU illuminates and extinguishes the centre room lamp in accordance with the input signals below.

Ignition switch (IG1)
Key reminder switch
Door switches
Front door lock actuator (driver’s side)

COMMENTS ON TROUBLE SYMPTOM

If this does not work normally, the above switch input circuit(s), centre room lamp assembly, or ETACS-ECU may have a problem.

PROBABLE CAUSES

Malfunction of the key reminder switch
Malfunction of door switch
Malfunction of the front door lock actuator (driver’s side)
Malfunction of centre room lamp assembly
Malfunction of the ETACS-ECU
Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Front room lamp operation check.

Check that the front room lamp illuminates and extinguishes normally.

Q. Is the check result normal?

Go to Step 2.

Refer to Inspection Procedure 1 "The front room lamp does not illuminate normally"

STEP 2. Retest the system.

Q. At which switch positions (DOOR or ON), the centre room lamp does not illuminate?

The lamp does not illuminate at both the DOOR and ON positions.

: Go to Step 3.

The lamp does not illuminate at the ON position.

: Go to Step 5.

The lamp does not illuminate at the DOOR position.

: Go to Step 6.

STEP 3. Centre room lamp bulb check.

Check that the centre room lamp bulb is normal.

Q. Is the check result normal?

Go to Step 4.

Replace the centre room lamp bulb (Refer to

STEP 4. Check of open circuit in power supply lines between the centre room lamp connector and the fusible link.

Q. Is the check result normal?

Go to Step 7.

Repair the connector(s) or wiring harness.

STEP 5. Check of open circuit in earth line between the centre room lamp connector and the body earth.

Q. Is the check result normal?

Go to Step 7.

Repair the connector(s) or wiring harness.

STEP 6. Check of open circuit in ROOM LP lines between the centre room lamp connector and the ETACS-ECU connector.

Q. Is the check result normal?

Go to Step 7.

Repair the connector(s) or wiring harness.

STEP 7. Retest the system.

Check that the centre room lamp illuminates/extinguishes normally.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction

Replace the room lamp assembly (Refer to