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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 274 (Lighting System - DTC B3891 To DTC C0297 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Rear Fog Lamps Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, headlamps ON.
  2. Verify the scan tool Rear Fog Lamps Switch parameter changes between Active and Inactive while commanding the rear fog lamp ON and OFF with the rear fog lamp switch.
    • If the parameter does not change 

      Refer to Rear Fog Lamp Switch Malfunction.

    • If the parameter changes 
  3. Verify the rear fog lamp turns ON and OFF when commanding the Rear Fog Lamps ON and OFF with a scan tool.
    • If the rear fog lamp does not turn ON and OFF 

      Refer to Rear Fog Lamp Malfunction.

    • If the rear fog lamp turns ON and OFF 
  4. Verify the rear fog lamp indicator on the instrument cluster turns ON and OFF while commanding the rear fog lamp ON and OFF with the rear fog lamp switch.
    • If the rear fog lamp indicator does not turn ON and OFF 

      Refer to Rear Fog Lamp Indicator Malfunction.

    • If the rear fog lamp indicator turns ON and OFF 
  5. All OK.
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