Inspection Procedure 5: The Rear Fog Lamp Indicator 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.




COMMENTS ON TROUBLE SYMPTOM


If the rear fog lamp indicator does not illuminate normally, connector(s), wiring harness in the CAN bus lines, the ETACS-ECU or the combination meter may be defective.

PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. Check the rear fog lamp


When the rear fog lamp switch is operated, check that the rear fog lamps illuminate/go off normally.

Q. Is the check result normal?

Go to Step 2.

First, repair the rear fog lamp (Refer to trouble symptom chart ).

STEP 2. M.U.T.-III CAN bus diagnostics


Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

Go to Step 3.

Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).

STEP 3. 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 4.

STEP 4. M.U.T.-III other system actuator test


Perform the actuator test for the combination meter, and check that the rear fog lamp indicator illuminates (Refer to Combination Meter ).

Q. Is the check result normal?

Replace the ETACS-ECU.

Replace the combination meter.