Inspection Procedure 17: The coming home 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 coming home light function does not operate normally, the keyless entry system or the ETACS-ECU may have a problem. Or, the coming home 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 "Coming home light" with a customisation function.

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

Go to Step 2.

Set "Coming home 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. M.U.T.-III data list


Using the ETACS-ECU service data, check the ignition switch signal.

Item No.
 Item name
 Normal condition
Item 254
 IG voltage
 1 V or less
OK: Normal condition is displayed.

Q. Is the check result normal?

Go to Step 4.

Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 2 "The ignition switch (IG1) signal is not received" .

STEP 4. Check the headlamps.


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

Q. Is the check result normal?

Go to Step 5.

Troubleshoot the headlamps. Refer to trouble symptom chart .

STEP 5. Retest the system.


The coming home light function 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.