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 CAN bus line is defective.
  • The combination meter may be defective
  • The ETACS-ECU may be defective
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check that the hazerd warning lamps operate.
Check that the hazerd warning lamps illuminate normally.

Q. Is check result normal?
Go to Step 2.
First, repair the turn-signal lamp. Refer to Inspection Procedure L-2 "The hazerd 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. M.U.T.-III diagnosis code
When the ignition switch is turned to the LOCK (OFF) position, check that the ETACS-ECU does not set the diagnosis code.

Q. Is the diagnosis code set?
Refer to diagnosis code chart .
Go to Step 4.

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

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