Alarm Module: Testing and Inspection

Inspection of ICM and Its Circuit

Immobilizer Control System Wiring Circuit Diagram

ICM and its circuit can be checked at ICM wiring connector by measuring voltage.

NOTE:

If you connect a voltmeter or ohmmeter directly to the ICM by disconnecting the ICM connector, you can damage the ICM.

Never connect a voltmeter or an ohmmeter directly to any terminal on the ICM by disconnecting the ICM connector.

Voltage Check

1) Remove ICM (1) from steering lock assembly or steering lock unit referring to Service and Repair ICM Removal and Installation.
2) Connect ICM connector (2) to ICM.
3) Check voltage at each terminal.

NOTE:
As each terminal voltage is affected by the battery voltage, confirm that it is 11 V or more when the ignition switch is turned to ON position.













Reference Waveform

NOTE:

- Waveform analysis is as follows.











- Waveform might change for measurement condition and vehicle spec.