Diagnostic Aids

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This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
When disconnecting electrical connectors or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the mating electrical terminals for tightness.
Use the J 35616 GM Approved Terminal Test Kit for any test that requires probing the underhood fuse block terminals, component wire harness terminals, or the ECM wire harness connector terminals. See Special Tools .