Inspection procedure B-5: Ignition key reminder buzzer function 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 input signals below.

  • Ignition switch (IG1)
  • Key reminder switch
  • Driver’s door switch
If this function does not work normally, these input signal circuit(s) or the ETACS-ECU may be defective.

PROBABLE CAUSES

  • Malfunction of the key reminder switch
  • Malfunction of the driver’s door switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the power supply circuit.
When the ignition switch is turned to the LOCK (OFF) position, check if the hazard warning lamps illuminate.

Q. Is the check result normal?
Go to Step 2.
Refer to inspection procedure A-1 "Check the battery power supply circuit to the ETACS-ECU ."

STEP 2. Pulse check
Check the input signals below, which are related to the ignition key reminder function.
System switch
 Check condition
Ignition switch (IG1)
 When turned from ACC to ON
Key reminder switch
 When the inserted ignition key is pulled out
Driver’s door switch
 When the driver’s door is opened
OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Are the check result normal?
YES <All the signals are received normally.> : Go to Step 3.
NO <The ignition switch (IG1) signal is not received.> : Refer to .
NO <The key reminder signal is not received.> : Refer to .
NO <The driver’s door switch signal is not received.> : Refer to .

STEP 3. Retest the system.
The ignition key reminder buzzer function should work normally.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
Replace the ETACS-ECU.