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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 958 (Trailer Brake Control System) >> Diagnostic Information and Procedures >> DTC C0800 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. If the DTC is history, refer to Charging System Test .
  2. If the DTC is current, start the engine, and measure the voltage between the battery positive voltage circuits of the TBCM and the ground circuit.
    • If the voltage is within 9-17 volts, replace the affected module.
    • If the voltage is not within 9-17 volts, measure the voltage between the battery positive voltage circuits of the TBCM and a separate good ground.
    • If the voltage is within 9-17 volts, test the battery positive ground circuits of the TBCM for high resistance or an open, and repair as necessary.
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