Inspection Procedure 1: None of the tail lamps illuminate.


caution Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

COMMENTS ON TROUBLE SYMPTOM


If all the tail lamps do not illuminate normally, the tail lamp switch input circuit or ETACS-ECU may have a problem.

PROBABLE CAUSES



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?

Troubleshoot the ETACS-ECU (Refer to ).

Go to Step 2.

STEP 2. M.U.T.-III data list


Use the ETACS-ECU service data to check the signals related to the tail lamp illumination.

Item No.
 Item name
 Normal condition
59
 Tail lamp output
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?

Go to Step 3.

Troubleshoot the ETACS-ECU (Refer to Inspection Procedure 9 "The column switch signal is not received" ).

STEP 3. Retest the system


Check that the tail lamp illuminates normally.

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 (Refer to ).