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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 258 (Retained Accessory Power System) >> Diagnostic Information and Procedures >> DTC B1477 or B1478: Short To Ground In WND RAP Relay Control Circuit >> Test Description

Test Description

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The numbers below refer to the step numbers on the diagnostic table.

  1. 2. During the WND RAP relay operation, listen for an audible click. Command the ON and the OFF states. Repeat the commands as necessary.
  2. 3. Verifies whether the WND RAP relay has a defect.
  3. 4. Tests the control circuit of the WND RAP relay.
  4. 5. Tests the ground circuit of the WND RAP relay.
    Fig 1: DTC B1477 Or B1478 (1 Of 2)
    G02422763Courtesy of GENERAL MOTORS CORP.
    Fig 2: DTC B1477 Or B1478 (2 Of 2)
    G02422764Courtesy of GENERAL MOTORS CORP.
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