Inspection Procedure 3: The Headlamps do not Illuminate When the Lighting Switch is at the "AUTO" or "PASSING" Position, but the Low-beam Illuminates (High-beam and Low-beam cannot be Changed) With the Switch at the "HEAD" Position.


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 headlamps illuminate only at low-beam regardless of the lighting switch position, the headlamp fail-safe function may be active.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III diagnosis code


Check if diagnosis code is set to the ETACS-ECU.

Q. Is the diagnosis code set?

Troubleshoot the ETACS-ECU. Refer to .

Go to Step 2.

STEP 2. Retest the system


Check that the headlamps illuminate normally.

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 ).

Replace the ETACS-ECU.