Inspection Procedure 1: The Front 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 front room lamp in accordance with the input signals below.

Ignition switch (IG1)
Key reminder switch
Door switches
Tailgate latch switch
Front door lock actuator (RH)

COMMENTS ON TROUBLE SYMPTOM

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

PROBABLE CAUSES

Malfunction of the key reminder switch
Malfunction of door switch
Malfunction of tailgate latch switch
Malfunction of the front door lock actuator (RH)
Malfunction of front room lamp
Malfunction of the ETACS-ECU
Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Rear room lamp operation check

Check that the rear room lamp illuminates and extinguishes normally.

Q. Is the check result normal?

Go to Step 2.

Replace the ETACS-ECU.

STEP 2. M.U.T.-III diagnosis code

Check if diagnosis code is set to the ETACS-ECU.

Q. Is the diagnosis code set?

Troubleshoot the ETACS-ECU. Refer to

Go to Step 3.

STEP 3. M.U.T.-III data list

Use the ETACS-ECU service data to check the signals related to the operation of front room lamp.

Turn the ignition switch to the LOCK (OFF) position.
Remove the ignition key from the ignition key cylinder.
Open each door.
Open the tailgate.

Item No.	Item name	Normal condition
Item 228	Dr door unlock	ON
Item 254	IG voltage	Battery voltage
Item 256	Dr door ajar switch	Open
Item 257	As door ajar switch	Open
Item 258	RR door ajar switch	Open
Item 259	RL door ajar switch	Open
Item 260	Trunk/gate trunk ajar switch	Open
Item 264	Handle lock switch	Key in → Key out

OK: Normal conditions are displayed for all the items.

Q. Is the check result normal?

Normal conditions are displayed for all the items.

: Go to Step 4.

Normal condition is not displayed for item No. 228. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 4 "The front door lock actuator (driver’s side) signal is not received"

.

Normal condition is not displayed for item No. 254. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 2 "The ignition switch (IG1) signal is not received"

.

Normal condition is not displayed for item No. 256. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 5 "The front door switch (driver’s side) signal is not received"

.

Normal condition is not displayed for item No. 257. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 6 "The front door switch (passenger’s side) signal is not received"

.

Normal condition is not displayed for item No. 258. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 7 "The rear door switch (RH) signal is not received"

.

Normal condition is not displayed for item No. 259. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 8 "The rear door switch (LH) signal is not received"

.

Normal condition is not displayed for item No. 260. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 9 "Tailgate latch switch signal is not received"

.

Normal condition is not displayed for item No. 264. : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 3 "Key reminder switch signal is not received"

STEP 4. Connector check: D-02 front room lamp connector

Q. Is the check result normal?

Go to Step 5.

Repair the defective connector.

STEP 5. Front room lamp bulb check

Check that the front room lamp bulb is normal.

Q. Is the check result normal?

Go to Step 6.

Replace the front room lamp bulb.

STEP 6. Connector check: C-316 ETACS-ECU connector

Q. Is the check result normal?

Go to Step 7.

Repair the defective connector.

STEP 7. Wiring harness check between the D-02 front room lamp connector terminal No. 2/3 and the C-316 ETACS-ECU connector terminal No. 6/5

Check the input/output line for open circuit.

Q. Is the check result normal?

Go to Step 8.

Repair the wiring harness.

STEP 8. Connector check: D-02 front room lamp connector

Q. Is the check result normal?

Go to Step 9.

Repair the defective connector.

STEP 9. Wiring harness check between the D-02 front room lamp connector terminal No. 1 and the body earth

Check the output lines for open circuit.

Q. Is the check result normal?

Replace the front room lamp, and then go to Step 10.

Repair the wiring harness.

STEP 10. Retest the system

Check that the front 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 ETACS-ECU.