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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 83 (Fixed And MOVEABLE Windows) >> Diagnostic Information and Procedures >> Power Windows Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition - On / Vehicle - In Service Mode
  2. Operate the component: S79D Window Switch - Driver - Pressed & Pulled
  3. Verify the component works as specified: M74D Window Motor - Driver = Up & Down
    • If not the specified state 

      Refer to: Circuit/System Testing–Test 1

    • Go to next step: If the specified state 
  4. Operate the component: Passenger Window Switch @ S79D Window Switch - Driver - Pressed & Pulled
  5. Verify the component works as specified: M74P Window Motor - Passenger = Up & Down
    • If not the specified state 

      Refer to: Circuit/System Testing–Test 2

    • Go to next step: If the specified state 
  6. Operate the component: S79P Window Switch - Passenger - Pressed & Pulled
  7. Verify the component works as specified: M74P Window Motor - Passenger = Up & Down
    • If not the specified state 

      Refer to: Circuit/System Testing–Test 3

    • Go to next step: If the specified state 
  8. All OK.
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