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Home >> Buick >> 2018 >> Regal GS >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System - Diagnostic Information And Procedures (B388B-P0504) And Symptoms >> Diagnostic Information and Procedures >> Rear Fog Lamps Malfunction >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON, park lamps 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 Circuit/System Testing - Rear Fog Lamp Switch Malfunction.

    • Go to next step: If the parameter changes 
  3. Verify the rear fog lamps turn ON and OFF when commanding the Rear Fog Lamp(s) Relay ON and OFF with a scan tool.
    • If the rear fog lamps do not turn ON and OFF 

      Refer to Circuit/System Testing - Rear Fog Lamps Malfunction.

    • Go to next step: If the rear fog lamps turn ON and OFF 
  4. Verify the rear fog lamp indicator on the headlamp switch 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 Circuit/System Testing - Rear Fog Lamp Indicator Malfunction.

    • Go to next step: If the rear fog lamp indicator turns ON and OFF 
  5. All OK.
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