Test Notes

73 Digital Multimeter Or Equivalent:

New Generation Star (NGS) Tester Or Equivalent:

SPECIAL SERVICE TOOLS RECOMMENDED

CAUTION:
^ Before removing and installing the General Electronic Module (GEM) or its connectors, disconnect the battery. Failure to follow this caution will result in the GEM storing many erroneous DTCs and may result in the GEM exhibiting erratic operation after installation.
^ Be careful when probing the fuse junction panel, power distribution box or any connectors. Damage will result to the connector receptacle if the probe or terminal being used is too large.

NOTE:
^ If unable to communicate with the GEM.
^ If continuous DTCs are recorded and the symptom is not present when performing the pinpoint tests, an intermittent concern may be the cause. Always check for loose connections and corroded terminals.
^ Complete the entire pinpoint test related to the symptom before replacing the GEM.