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?

YES:  Go to Step 2.
NO:  Refer to Inspection Procedure A-2 "Check the ETACS-ECU battery power supply circuit ."

Step 2. Pulse check

Check the input signals belows which are related to the key reminder function.

System switch	Check condition
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 MUT-II/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-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>."
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>." Refer to Inspection Procedure P-13 "The driver's door lock actuator signal is not received <RH drive vehicles>."

Step 3. Retest the system.

Q: Does the ignition key reminder buzzer function work normally?

YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Replace the ETACS-ECU.