INSPECTION PROCEDURE L-8: The high-beam 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 high beam 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 headlamps.
When the lighting switch is operated, check that the headlamps illuminate/go off normally.

Q. Are the headlamps in good condition?
Go to Step 2.
First, repair the headlamps. Refer to Inspection Procedure L-3 "The high-beam headlamps do not illuminate normally ."

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. ECU check by using the SWS monitor
Check that the power supply and earth lines to the ETACS-ECU and the SWS communication lines are normal.

  • Ignition switch: OFF
ECU TO BE CHECKED
  • ETACS ECU
OK: "OK" is displayed on the "ETACS ECU" menu.

Q. Is the check result normal?
Go to Step 5.
Refer to Inspection Procedure A-3 "Communication with the ETACS-ECU is not possible ."

Step 5. M.U.T.-III actuator test
Perform the actuator test for the combination meter, and check that the high-beam indicator illuminates (Refer to GROUP 54A - Combination Meter ).

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