Inspection Procedure F-9: The headlamps (low-beam) and tail lamps illuminate regardless of the lighting switch positions. (High-beam does not Illuminate).


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

COMMENTS ON TROUBLE SYMPTOM


If the tail lamps and the headlamps illuminate abnormally, the LIN communication line 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. M.U.T.-III data list


Check the input signal from the tail lamp switch and headlamp (low-beam) switch.
(1)Turn the tail lamp switch to the ON position.
Item No.
 Item name
 Normal condition
03
 Tail lamp
 Being turned on
OK: Normal condition is displayed.
(2)Turn the headlamp (low-beam) switch to the ON position.
Item No.
 Item name
 Normal condition
04
 Low beam lamp
 Being turned on
OK: Normal condition is displayed.

Q. Is the check result normal?

YES <All the signals are received normally.> : Go to Step 3.

NO <The tail lamp switch signal is not received.> : Refer to Inspection Procedure J-1 "The column switch (lighting and wiper switch) signal is not received ."

NO <The headlamp (low-beam) switch signal is not received.> : Refer to Inspection Procedure J-1 "The column switch (lighting and wiper switch) signal is not received ."

STEP 3. Retest the system.


Check if the trouble symptom has been eliminated.

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 ).