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.










COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



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

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-106 centre panel unit connector

Q. Is the check result normal?
Go to Step 2.
Repair the defective connector.

STEP 2. Check the hazard warning lamp switch.
Check the hazard warning lamp switch. Refer to .

Q. Is the check result normal?
Go to Step 3.
Replace the centre panel unit.

STEP 3. Connector check: C-301 ETACS-ECU connector

Q. Is the check result normal?
Go to Step 4.
Repair the defective connector.

STEP 4. Wiring harness check between the C-301 ETACS-ECU connector terminal No. 19 and the C-106 centre panel unit connector terminal No. 5

  • Check the input line for open circuit.

Q. Is the check result normal?
Go to Step 5.
Repair the wiring harness.

STEP 5. M.U.T.-III data list
Turn ON the hazard lamp switch.
Item No.
 Item name
 Normal condition
Item 265
 Hazard switch
 ON
OK: Normal condition is displayed.

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.