INSPECTION PROCEDURE L-4: The turn-signal indicator lamp does not illuminate.


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.


COMMENTS ON TROUBLE SYMPTOM
If the turn-signal indicator lamp 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 that the hazard warning lamps operate.
Check that the hazard warning lamps illuminate normally.

Q. Is the check result normal?
Go to Step 2.
First, repair the headlamps. Refer to Inspection Procedure L-2 "The hazard warning lamps do 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 trurn-signal indicator lamps illuminate (Refer to GROUP 54A - Combination Meter ).

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