Inspection of 4WD Control Module and Its Circuits: Notes
4WD control module and its circuits can be checked by measuring voltage and pulse signal at connector connected to 4WD control module.
CAUTION:
If you connect a voltmeter or ohmmeter directly to the 4WD control module terminals by removing the control module connector, 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 connector.