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.
When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID .)

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

Malfunction of column switch
Malfunction of the ETACS-ECU
Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Licence plate lamp operation check

Check that the licence plate lamp illuminates normally.

Q. Is the check result normal?

Go to Step 2.

Replace the ETACS-ECU.

STEP 2. M.U.T.-III diagnosis code

Check if diagnosis code is set to the ETACS-ECU.

Q. Is the diagnosis code set?

Troubleshoot the ETACS-ECU. Refer to

Go to Step 3.

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

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

Turn the lighting switch to the "TAIL" position.

Item No.	Item name	Normal condition
Item 340	Head lamp switch (tail)	ON

OK: Normal condition is displayed.

Q. Is the check result normal?

Go to Step 4.

Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 11 "The column switch signal is not received"

STEP 4. 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.