54 -CHASSIS ELECTRICAL > 54A-CHASSIS ELECTRICAL > HEADLAMP > SYMPTOM PROCEDURES > HIGH-BEAM INDICATOR LAMP DOES NOT ILLUMINATE NORMALLY.
Inspection Procedure 4: The high-beam indicator lamp does not illuminate.
caution
Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
COMMENTS ON TROUBLE SYMPTOM
If the high-beam indicator does not illuminate normally, the harness in the CAN bus lines, connector(s), ETACS-ECU, or combination meter may have a problem.
PROBABLE CAUSES
Malfunction of the ETACS-ECU
Malfunction of combination meter
Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. Headlamp (high-beam) check
Check that the headlamps (high-beam) illuminate/extinguish normally when the lighting switch is operated.
Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure 1 "None of the high-beam headlamps illuminate." .
STEP 2. M.U.T.-IIISE CAN bus diagnostics
Use the M.U.T.-IIISE to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 3.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
STEP 3. M.U.T.-IIISE diagnosis code
Check if diagnosis code is set in the ETACS-ECU.
Is the diagnosis code set?
Troubleshoot the ETACS-ECU. Refer to .
Go to Step 4.
STEP 4. M.U.T.-IIISE other system special function
Using M.U.T.-IIISE, select "Test" from the special function of the combination meter. Execute the following item to check the high beam indicator (Refer to Combination Meter ).
Item 7: Illumination (AUTO)
Item 9: Indicator (AUTO)
Is the check result normal?
Go to Step 5.
Troubleshoot the combination meter. Refer to .
STEP 5. Retest the system
Check that the high beam indicator illuminate normally.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).