Inspection Procedure 10: The hazard warning lamp switch signal is not received.


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



PROBABLE CAUSES



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

DIAGNOSIS PROCEDURE


STEP 1. Check the hazard indicator assembly.



Q. Is the check result normal?





STEP 2. Resistance measurement at hazard indicator assembly connector (earth terminal)


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between the hazard indicator assembly connector (earth terminal) and body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?





STEP 3. Check of open circuit in earth line between hazard indicator assembly connector and body earth


Q. Is the check result normal?





STEP 4. Check of short to power supply, short to earth, and open circuit in HAZ line between ETACS-ECU connector and hazard indicator assembly connector


Q. Is the check result normal?





STEP 5. M.U.T.-III data list




  • Turn ON the hazard warning lamp switch.
Item No.
 Item name
 Normal condition
Item 265
 Hazard switch
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?