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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 981 (Lighting Systems) >> Diagnostic Information and Procedures >> Front Fog Lamps Malfunction >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition ON, observe the scan tool Front Fog Lamp Switch parameter while pressing and releasing the front fog lamp switch. The reading should change between Active and Inactive.
    • If not the specified value, refer to the fog lamp switch circuit test below.
  2. Ignition ON, command the Fog Lamps ON and OFF with a scan tool. Verify the front fog lamps turn on and off.
    • If the front fog lamps are always on or always off, refer to the fog lamp control circuit test below.
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