Inspection of 4WD Control Module and Its Circuits: Notes
WARNING: This page is about a different car, the 2006 Suzuki XL-7. However, it is still accessible from the selected car via links, so may be relevant.
4WD control module and its circuits can be checked at 4WD control module wiring couplers by measuring voltage, pulse signal and resistance.
CAUTION:
4WD control module cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to 4WD control module with couplers disconnected from it.