INSPECTION PROCEDURE C-5: The ignition key reminder function does not work normally. <Vehicles with keyless entry system>


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

COMMENTS ON TROUBLE SYMPTOM
If the key reminder function does not work normally, the input signal circuits below or the ETACS-ECU may be defective.

  • Key reminder switch
  • Driver’s door switch
  • Driver’s door lock actuator

POSSIBLE CAUSES

  • Malfunction of the key reminder switch
  • Malfunction of the driver’s door switch
  • Malfunction of the driver’s door lock actuator
  • 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
ECUS 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 Inspection Procedure A-3 "Communication with ETACS-ECU is not possible ."

Step 2. SWS monitor data list.
Check the SWS communication signals, which are related to the key reminder function.
<Selected item> ETACS ECU
  • Driver’s door: open
Item No.
 Item name
 Normal condition
Item 32
 DR DOOR SW
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 3.
Refer to inspection procedure P-5 "The driver’s door switch signal is not received <LH drive vehicles> or <RH drive vehicles>."

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 REMIN SW
 OFF

  • Driver’s door: Unlock → Lock
Item No.
 Item name
 Normal condition
Item 21
 DR DOR LCK SW
 from OFF to ON
Item 22
 DR DOR ULK SW
 from ON to OFF
OK: Normal condition are displayed for all the items.

Q. Is the check result normal?
All the signals are received normally. : Go to Step 4.
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 lock actuator switch signal is not received. : Refer to inspection procedure P-13 "The driver’s door lock actuator signal is not received <LH drive vehicles> or <RH drive vehicles>."

Step 4. Retest the system.

Q. Does the ignition key reminder function work normally?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.