Inspection Procedure 1: The hazard warning lamps do not 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 the hazard warning lamps do not illuminate, the hazard warning lamp switch input circuit in centre panel unit or the ETACS-ECU may have a problem.

PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. Check that the turn-signal lamps operate.


Check that the turn-signal lamps illuminate normally.

Q. Is the check result normal?

Go to Step 2.

Diagnose the headlamps. Refer to Inspection Procedure 13 "None of the turn-signal lamps illuminate" .

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


Using the ETACS-ECU service data, check the hazard warning lamp signal.

Item No.
Item name
Normal condition
Item 265
Hazard switch
ON
OK: Normal condition is displayed.

Q. Is the check result normal?

Go to Step 3.

Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 10 "The hazard warning lamp switch signal is not received" .

STEP 3. Retest the system


Check that the hazard warning lamps illuminate 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.