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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1890 (Hybrid/EV Control System) >> Diagnostic Information and Procedures >> DTC P0AFF >> Circuit/System Testing
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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. Disconnect the B+ harness connector X3 at the K1 accessory DC power control module.
  2. Connect a test lamp between the 12-volt battery positive post and the accessory DC power control module connector X3 at the module.
  3. Ignition ON, observe the 12-volt parameter in the accessory DC power control module 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 accessory DC power control module.
  4. Ignition OFF, Remove the positive connection at the 12-volt battery.
  5. Measure the resistance between the X3 harness 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 Bussed Electrical Center.
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