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.