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 which are related to the keyless entry system.

System switch	Check conditions
Key reminder switch	When the inserted ignition key is pulled out
All of the door switches	A door is opened when all the doors are closed
Driver's door lock actuator switch	When the driver's key cylinder or inside lock knob is unlocked or locked
Keyless entry transmitter switch	When the switch is turned from off to on

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 key reminder switch signal is not received.:  Refer to inspection procedure P-10 "The key reminder switch signal is not received ."
All the door switch signals are not received.:  Refer to inspection procedure P-13 "All the door switch signals are not received ."
The driver's door lock actuator switch signal is not received.:  Refer to inspection procedure P-14 "The driver's door lock actuator switch signal is not received ."
The keyless entry transmitter switch signal is not received.:  Refer to inspection procedure P-16 "Each switch signal of the keyless entry transmitter is not received ."

Step 3. Retest the system.

Check the keyless entry system works 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.