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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 924 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC B1480: Inadvertent Power 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. Listen for an audible click when the inadvertent power relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 3. Tests for voltage at the coil side of the inadvertent power relay. The CTSY fuse supplies power to the coil side of the inadvertent power relay.
  3. 4. Verifies that the body control module is providing ground to the inadvertent power relay.
  4. 5. Tests if a ground is constantly applied to the inadvertent power relay.
  5. 6. Since this is a general circuit malfunction code, it is necessary to test for both a short to voltage as well as an open on this circuit.
    Fig 1: DTC B1480 (1 Of 2)
    G01476180Courtesy of GENERAL MOTORS CORP.
    Fig 2: DTC B1480 (2 Of 2)
    G01476181Courtesy of GENERAL MOTORS CORP.
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