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Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the B+ harness connector X3 at the APM.
  2. Connect a test lamp between the 12-volt battery positive and the APM connector X3 at the module.
  3. Ignition ON, observe the 12-volt parameter in the APM data list. The parameter should be within 0.5 volt of the actual 12-volt battery voltage.
    • If the voltage is not within the specified range, replace the APM.
  4. Ignition OFF, Remove the positive connection at the 12-volt battery.
  5. Measure the resistance between the X3 connector and the battery positive connection.
    • If the resistance is greater than 1.0 ohm, repair the high resistance condition in the 12-volt circuit.
    • If the resistance is less than 1.0 ohm, replace the battery positive cable - control module to auxiliary BEC.
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