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Circuit/System Testing

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X3 14-volt harness connector and the X2 42-volt harness connector at the K1 accessory DC power control module. Make sure neither harness connector contacts chassis ground.
  2. Test for less than 1.0 ohm between the K1 accessory DC power control module and chassis ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminals listed below and ground:
    • Connector X3 Terminal A
    • Connector X1 Terminal 3
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. If all circuits test normal, replace the K1 accessory DC power control module.
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