Inspection Procedure O-3: The hazard warning lights do not flash while the security alarm is triggered.


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

COMMENTS ON TROUBLE SYMPTOM
If the hazard warning lights do not flash normally, the ETACS-ECU may be defective. Also, the security alarm function may have been disabled with a customization function.

POSSIBLE CAUSES

  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check that the hazard warning lights operate.
Check that the hazard lamps illuminate normally.

Q. Is the check result normal?
Go to Step 2 .
Refer to inspection procedure L-2 "The hazard warning lights do not illuminate ".

Step 2. Customize function by using the SWS monitor.
Use the SWS monitor customization function to confirm that "SECURITY ALM" is set to other than "W/O FUNCTION" (one of the settings below).

  • Horn and hazard
  • Hazard only
caution The SWS monitor must be used in order to confirm and change that setting. Use the SWS monitor to confirm and/or change the customized function.

Q. Is the check result normal?
Go to Step 3 .
Use the SWS monitor customisation function to set "SECURITY ALM" to any setting other than "W/O FUNCTION" (Refer to ).

Step 3. Retest the system.
Check that the security alarm works normally.

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.