Inspection Of Immobilizer Control Module (ICM) And Its Circuit: Notes
WARNING: This page is about a different car, the 2007 Suzuki Grand Vitara and 2006 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.
Reference: IMMOBILIZER CONTROL SYSTEM WIRING CIRCUIT DIAGRAM
ICM and its circuit can be checked at ICM wiring connector by measuring voltage.
CAUTION:
ICM cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to ICM with connector disconnected from it.