Inspection Procedure 16: The welcome light function does not work normally.


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


When the welcome light function does not operate normally, the keyless entry system or the ETACS-ECU may have a problem. Or, the welcome light function may have been set to disabled using the customisation function.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. ETACS-ECU customise function check.


Check that any one of the followings other than "Disabled" is set for "Welcome light" with a customisation function.

Q. Is it set to other than "Disabled"?

Go to Step 2.

Set "Welcome light" to any one other than "Disabled" with a customise function (Refer to ).

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. Check the keyless entry system operation


Check that the keyless entry system operation normally.

Q. Is the check result normal?

Go to Step 4.

Troubleshoot the keyless entry system. Refer to GROUP 42A - Troubleshooting <Vehicles without KOS> or GROUP 42B - Troubleshooting <Vehicles with KOS>.

STEP 4. Check the tail lamps and headlamps.


When the lighting switch is operated, check that the tail lamps and headlamps illuminate/go off normally.

Q. Is the check result normal?

Go to Step 5.

Troubleshoot the tail lamps and headlamps. Refer to trouble symptom chart .

STEP 5. Retest the system.


The welcome light should work 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.