INSPECTION PROCEDURE M-2: 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.

POSSIBLE CAUSES

  • Malfunction of the hazard warning lamp switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

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 M-1 "The turn-signal lamps do not illuminate ."

Step 2. ETACS switch data by using the SWS monitor.
Check the ETACS-ECU signals which are related to the hazard warning lights.

  • Hazard lamp switch: ON
Item No.
 Item name
 Normal condition
Item 04
 HAZARD LMP SW
 ON (only when switch is operated)
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 3.
Refer to inspection procedure P-11 "The hazard warning lamp switch signal is not received ."

Step 3. 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.