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Home >> GMC >> 2024 >> Hummer EV 2 >> Repair and Diagnosis >> Body & Frame >> Fixed And MOVEABLE Windows >> Diagnostic Information and Procedures >> DTC B1955 >> Circuit/System Verification
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Circuit/System Verification

  1. Vehicle Power Mode - Run/Service Mode.
  2. Operate the component: S79RR Rear Side Door Window Switch-Right - Pressed & Pulled.

    Verify the component works as specified:

    • M74RR Rear Side Door Window Regulator Motor-Right = Up
    • M74RR Rear Side Door Window Regulator Motor-Right = Down
    • M74RR Rear Side Door Window Regulator Motor-Right = Express Up
    • If the component does not work as specified 

      Refer to: Circuit/System Testing

    • Go to next step: If the component works as specified 
  3. A fault that is not currently present may have been caused by a intermittent condition.