Inspection Procedure 9: The column switch signal is not received.

caution

Whenever the ECU is replaced, ensure that the communication circuit is normal.

COMMENTS ON TROUBLE SYMPTOM

The ETACS-ECU receives the column switch signal via the LIN communication. If there is an abnormality to column switch or LIN bus line, the lights and wiper/washer do not work normally.

PROBABLE CAUSES

Malfunction of lighting switch
Malfunction of wiper/washer switch
Faulty LIN bus line

DIAGNOSIS PROCEDURE

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

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

Q. Is the diagnosis code set?

Refer to Diagnosis code chart.

Go to Step 2.

STEP 2. Column switch check

Check the continuity for lighting switch. Refer to .
Check the continuity for wiper/washer switch. Refer to .

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

).

NO <Lighting switch> : Replace the lighting switch.

NO <Wiper/washer switch> : Replace the wiper/washer switch.