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. 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 2.
Refer to GROUP 54C - Inspection Procedure 2 "Communication with the 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
 ON
Item 43
 BUZZER
 ON
OK: Normal conditions are displayed for all the items.

Q. Are the check result normal?
YES <Normal conditions are displayed for all the items.> : Go to Step 3.
NO <Normal condition is not displayed for item No.30 or No.32.> : Refer to .
NO <Normal condition is not displayed for item No.43.> : Replace the ETACS-ECU.

STEP 3. ETACS switch data by using the SWS monitor
Check the ETACS-ECU signal related to the ignition key reminder function.

  • Ignition switch: OFF (key inserted)
Item No.
 Item name
 Normal condition
Item 03
 Key reminder switch
 OFF
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 4.
Refer to .

STEP 4. 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 Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.