Inspection Procedure 1: The Hazard Warning Lamps do not Illuminate.


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.


COMMENTS ON TROUBLE SYMPTOM


If the hazard warning lamps do not illuminate, the hazard warning lamp input signal circuit or the ETACS-ECU may be defective.

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.

Check the turn-signal lamps (Refer to trouble symptom chart ).

STEP 2. Check the power supply circuit.


When the ignition switch is at the LOCK (OFF) position, check that the functions below work normally.

Q. Is the check result normal?

Go to Step 3.

Refer to ETACS - inspection procedure A-1 "Check the battery power supply circuit to the ETACS-ECU ."

STEP 3. Pulse check


Check the input signal from the hazard warning lamp switch.
System switch
 Check condition
Hazard warning lamp switch
 When the hazard warning lamp switch is turned from off to on
OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Is the check result normal?

Go to Step 4.

Refer to ETACS - Input Signal Chart .

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 Cope with Intermittent Malfunction ).

Replace the ETACS-ECU.