INSPECTION PROCEDURE B-1: 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.

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. 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: OFF

ECU TO BE CHECKED

ETACS ECU

OK: "OK" is displayed on the "ETACS ECU" menu.

Q: Is the check result normal?

YES: Go to Step 2

.
NO: Refer to Inspection Procedure A-3 "Communication with ETACS-ECU is not possible

Step 2. Function diagnosis by using the SWS monitor

Check the SWS communication signals, which are related to the ignition key reminder function.

<Selected item> BUZZER - KEY REMND. ALM

Ignition switch: OFF (key inserted)

Driver's door: open

Item No.	Item name	Normal condition
Item 30	IG SW(IG1)	OFF
Item 32	DR DOOR SW^*1	ON
Item 32	FRONT DOOR SW^*2	ON
Item 43	BUZZER	ON

NOTE:

^*1 : Except for Australia

^*2 : Vehicles for Australia

OK: Normal conditions are displayed for all the items.

Q: Is the check result normal?

Normal conditions are displayed for all the items.: Go to Step 3

.
Normal condition is not displayed for item No.30.: Refer to Inspection Procedure P-2 "The ignition switch (IG1) signal is not received

."
Normal condition is not displayed for item No.32.: 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>

."
Normal condition is not displayed for item No.43.: Go to Step 3

Step 3. Pulse check

Check the input signals below, which are related to the ignition key reminder function.

System switch	Check condition
Key reminder switch	When the inserted ignition key is pulled out

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

Q: Is the check result normal?

YES: Go to Step 4

.
NO: Refer to Inspection Procedure P-12 "The key reminder switch signal is not received

Step 4. 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.