INSPECTION PROCEDURE B-1: Ignition key reminder buzzer function does not work. <Vehicles for GCC only>

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.

POSSIBLE 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?

YES: Go to Step 2

.
NO: Refer to Inspection Procedure A-2 "Check the ETACS-ECU battery power supply circuit

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 MUT-II/III sounds or the voltmeter needle fluctuates.

Q: Is the check result normal?

All the signals are received normally.: Go to Step 3

.
The ignition switch (IG1) signal is not received.: Refer to Inspection Procedure P-2 "The ignition switch (IG1) signal is not received

."
The key reminder switch signal is not received.: Refer to Inspection Procedure P-10 "The key reminder switch signal is not received

."
The driver's door switch signal is not received.: Refer to Inspection Procedure P-4 "The driver's door switch signal is not received <LH drive vehicles>

." Refer to Inspection Procedure P-4 "The driver's door switch signal is not received <RH drive vehicles>

Step 3. Retest the system.

The ignition key reminder buzzer function should work normally.

Q: Is the check result normal?

YES: The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction

).
NO: Replace the ETACS-ECU.