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

caution

Whenever the ECU is replaced, ensure that the input signal circuit is normal.

COMMENTS ON TROUBLE SYMPTOM

Input signal from the column switch is used to operate the functions below. If the signal is abnormal, these functions will not work normally.

Lamp reminder function
Turn-signal lamp operation sound function
Headlamps
Tail lamps
Auto lamps
Turn-signal lamps
Windshield wiper/washer
Rear wiper/washer
Front fog lamps
Rear fog lamps

PROBABLE CAUSES

Malfunction of the column switch
Malfunction of the ETACS-ECU

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 the column switch.

Refer to GROUP 54A - column switch

Q. Is the check result normal?

Go to Step 3.

Replace the column switch.

STEP 3. Check the column switch signal.

Check that the signals from the column switch are received.

Q. Is the check result normal?

The procedure is complete.

Replace the lighting switch. Go to Step 4.

STEP 4. Replace the ECU

Check that the signals from the column switch are received.

Q. Is the check result normal?

The procedure is complete.

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