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.

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.

Refer to inspection procedure B-1 "None of the turn-signal lamps illuminate ."

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


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

Q. Is the diagnosis code set?

Refer to diagnosis code chart .

Go to Step 3.

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


Check the input signal from the hazard warning lamp switch.

Item No.
 Item name
 Normal condition
26
 Hazard warning lamp switch
 OFF to ON (only when switch is operated)
OK: Normal condition is displayed.

Q. Is the check result normal?

Go to Step 4.

Refer to inspection procedure 8 "The hazard warning lamp switch signal is not received ."

STEP 4. Retest the system.


Check that the hazard warning lamps illuminate.

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 ).