INSPECTION PROCEDURE M-3: The fog lamp indicator 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 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.

POSSIBLE CAUSES

  • The combination meter may be defective
  • The ETACS-ECU may be defective
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the fog lamps.
When the fog lamp switch is operated, check that the fog lamps illuminate/go off normally.

Q. Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure M-2 "Any of the fog lamps does not illuminate ."

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 54F, Diagnosis ).

Step 3. Check for combination meter diagnosis code.
Check whether the combination meter-related diagnosis code is set.

Q. Is the diagnosis code set?
Diagnose the combination meter (Refer to GROUP 54A - Troubleshooting ).
Go to Step 4.

Step 4. M.U.T.-III actuator test
Perform the actuator test for the combination meter, and check that the fog lamp indicator illuminates (Refer to GROUP 54A - Combination Meter ).

Q. Is the check result normal?
Replace the ETACS-ECU.
Replace the combination meter.