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

PROBABLE 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. 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-2 "Check the ETACS-ECU battery power supply circuit ."

Step 2. Pulse check
Check the input signal which is related to the key reminder function.
System switch
 Check conditions
Driver’s door switch
 When the driver’s door is opened
Key reminder switch
 When the inserted ignition key is pulled out
Driver’s door lock actuator switch
 When the driver’s key cylinder or inside lock knob is unlocked or locked
OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

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

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