Inspection of 4WD Control Module and Its Circuits: Notes
4WD control module and its circuits can be checked at connector connected to 4WD control module by measuring voltage, pulse signal.
CAUTION:
If you connect a voltmeter or ohmmeter directly to the 4WD control module terminals by removing the control module connectors, you can damage the control module. Never connect a voltmeter or an ohmmeter directly to any terminal of the 4WD control module by disconnecting the control module connectors.