Inspection procedure B-6: The speed alarm buzzer does not work. <Vehicles for GCC>


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

COMMENTS ON TROUBLE SYMPTOM
The ETACS-ECU operates this function in accordance with the vehicle speed alarm request signal.
If this function does not work normally, the combination meter may be defective.

PROBABLE CAUSES

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

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54D - Troubleshooting ).

STEP 2. ECU check by using the SWS monitor
Check that the power supply and earth lines to the ETACS-ECU and the SWS communication lines are normal.

  • Ignition switch: ON
ECU TO BE CHECKED
  • ETACS ECU
OK: "OK" is displayed on the "ETACS ECU" menu.

Q. Is the check result normal?
Go to Step 3.
Refer to GROUP 54C - Inspection Procedure 2 "Communication with the ETACS-ECU is not possible ."

STEP 3. Check the combination meter.
Check that the speedometer works normally.

Q. Is the check result normal?
Go to Step 4.
Diagnose the combination meter (Refer to ).

STEP 4. Retest the system.
Check that the speed alarm buzzer 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.