Inspection Procedure F-10: Auto lamp function does not work normally.


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

COMMENTS ON TROUBLE SYMPTOM


If the auto lamp function does not work normally, connector(s), wiring harness in the LIN bus lines, the ETACS-ECU, the rain light sensor or the column switch may be defective.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. Check the tail lamps and headlamps.


When the lighting switch (in the position other than auto) is operated, check that the tail lamps and headlamps illuminate/go off normally.

Q. Are the headlamps in good condition?

Go to Step 2.

First, repair the tail lamps and headlamps. Refer to trouble symptom chart .

STEP 2. 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 3.

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


Check the input signal from the auto lamp switch.

Item No.
 Item name
 Normal condition
08
 Automatic lamp
 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.


(1)Temporarily replace the rain light sensor.
(2)The auto lamp function should work normally.

Q. Is the check result normal?

Replace the rain light sensor.

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 ).