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 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 conditions
Ignition switch (IG1)	When turned from ACC to ON
Key reminder switch	When the inserted ignition key is pulled out
Driver's door switch	When the driver's door is opened

OK: The MUT-II/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 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 switch signal is not received.:  Refer to inspection procedure P-4 "The driver's door 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?

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