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Home >> GMC >> 2007 >> Sierra 2500 HD, 2D Pickup, 6.6 6, 4WD, Part Time >> Repair and Diagnosis >> Body & Frame >> Towing Systems >> Trailer Brake Control System >> Diagnostic Information and Procedures >> DTC C0845 >> Circuit/System Testing

Circuit/System Testing

IMPORTANT: Verify that stop lamp DTCs are not set as current or history before performing this diagnostic. If stop lamp DTCs are set as current or history, go to lighting for diagnose.
  1. Ignition OFF, disconnect the harness connector of the TBCM.
  2. Ignition ON, test for 11 volts or greater between the IGN 1
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