Inspection Procedure F-4: The high-beam and low-beam headlamps do not illuminate when the passing switch is operated.


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM


If the low-beam and high-beam headlamps are normal, the passing switch input signal circuit or the ETACS-ECU may be defective.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


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


Check that ETACS-ECU sets a diagnosis code.

Q. Is the diagnosis code set?

Refer to diagnosis code chart .

Go to Step 2.

STEP 2. Check that the headlamps operate.


Check that the low-beam and high-beam headlamps work normally.

Q. Is the check result normal?

Go to Step 3.

Repair the headlamps. Refer to trouble symptom chart .

STEP 3. M.U.T.-III data list


Check the input signal from the passing switch.

Item No.
 Item name
 Normal condition
10
 Head lamp flasher
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?

Go to Step 4.

Refer to Inspection Procedure J-1 "The column switch (lighting and wiper switch) signal is not received ."

STEP 4. Retest the system.


When the passing switch is turned on, check if 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. Then perform the variant coding and write the VIN data (Refer to GROUP 00, Precautions Before Service - How to Perform Variant Coding ).