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Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Yukon, 2010 Chevrolet Tahoe, and 2010 Cadillac Escalade. 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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