Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

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Link: lemon-manuals.la

Test Notes

CAUTION
^ Electronic modules are sensitive to electrostatic discharge. If exposed to these charges, damage may result.
^ Disconnect the battery before removing and installing the Generic Electronic Module (GEM) or its connectors. Failure to follow this caution will result in the GEM storing many erroneous Diagnostic Trouble Codes (DTCs) and possibly exhibiting erratic operation after installation.
^ Be careful when probing the I/P fuse 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 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.