Inspection Procedure B-1: Ignition key reminder buzzer function does not work.


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


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

  • Ignition switch (IG1)
  • Key reminder switch
  • Front door switch (RH)

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?
Go to Step 2.
Refer to Inspection Procedure A-2 "When the ignition switch is at the LOCK (OFF) position, the functions do not work normally. Check the battery power supply circuit to the ETACS-ECU ."

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
Driver’s door switch
 When the driver’s door is opened
Key reminder switch
 When the inserted ignition key is pulled out
OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Are 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 driver’s door switch signal is not received. : Refer to Inspection Procedure P-4 "The driver’s door switch 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 ."

Step 3. 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.