Inspection Procedure 13: The LED headlamp warning lamp illuminates.

caution

Whenever the ECU is replaced, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

COMMENTS ON TROUBLE SYMPTOM

If the LED headlamp warning lamp illuminates, the LED headlamps, the related connectors, the ETACS-ECU or the combination meter may be defective.

PROBABLE CAUSES

Malfunction of the LED headlamp(s)
Malfunction of the ETACS-ECU
Malfunction of the combination meter
Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check that the headlamps operate.

Check that the low beam and high beam headlamps illuminate normally.

Q. Is the check result normal?

Go to Step 2.

Repair the headlamps. Refer to

STEP 2. Retest the system

Check whether the LED headlamp warning lamp is off.

Q. 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).

Go to Step 3.

STEP 3. Retest the system

Substitute the ETACS-ECU with a known good one. Turn the headlamps on by operating the lighting switch. Check whether the LED headlamp warning lamp is off.

Q. Is the check result normal?

Replace the ETACS-ECU.

Install the original ETACS-ECU, and replace the combination meter.