Inspection Procedure 2: 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
Malfunction of the ETACS-ECU
Malfunction of the combination meter
DIAGNOSIS PROCEDURE
STEP 1. Check the rear fog lamp
When the fog lamp switch is operated, check that the rear fog lamp 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 in the ETACS-ECU.
Q.
Is the diagnosis code set?
Troubleshoot the ETACS-ECU.
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.