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HOMESERVICE MANUALSCHEVROLET2018TAHOE LT, 4WD, GASREPAIR AND DIAGNOSISBODY & FRAMEWINDOWSFIXED AND MOVEABLE WINDOW SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESPOWER WINDOWS MALFUNCTIONCIRCUIT/SYSTEM VERIFICATION
2018 Chevrolet Tahoe LT, 4WD, Gas

Circuit/System Verification

2018 Chevrolet Tahoe LT, 4WD, GasSECTION Circuit/System Verification
  1. Ignition - On / Vehicle - In Service Mode
  2. Operate the component:S79D Window Switch - Driver-Left Rear Window Switch - Pressed & Pulled

    Verify the scan tool parameter:

    • Left Rear Window Main Control Down Switch=Inactive & Active
    • Left Rear Window Main Control Express Switch=Inactive & Active
    • Left Rear Window Main Control Up Switch=Inactive & Active
    • If not the specified state 

      Replace the component:S79D Window Switch - Driver

    • Go to next step: If the specified state 
  3. Operate the component:S79D Window Switch - Driver-Right Rear Window Switch - Pressed & Pulled

    Verify the scan tool parameter:

    • Right Rear Window Main Control Down Switch=Inactive & Active
    • Right Rear Window Main Control Express Switch=Inactive & Active
    • Right Rear Window Main Control Up Switch=Inactive & Active
    • If not the specified state 

      Replace the component:S79D Window Switch - Driver

    • Go to next step: If the specified state 
  4. Operate the component:S79D Window Switch - Driver-Right Front Window Switch - Pressed & Pulled

    Verify the scan tool parameter:

    • Front Passenger Window Main Control Down Switch=Inactive & Active
    • Front Passenger Window Main Control Express Switch=Inactive & Active
    • Front Passenger Window Main Control Up Switch=Inactive & Active
    • If not the specified state 

      Replace the component:S79D Window Switch - Driver

    • Go to next step: If the specified state 
  5. Operate the component:Driver Left Front Window Switch - Pulled=Up & Release

    Verify the component works as specified:M74D Window Motor - Driver =Express Up

    1. Operate the component:Driver Left Front Window Switch - Test all positions of the switch and verify that all according functions work properly.
    • M74D Window Motor - Driver =Up
    • M74D Window Motor - Driver =Express Up
    • M74D Window Motor - Driver =Down
    • M74D Window Motor - Driver =Express Down
    • If not the specified state 

      Refer to: Circuit/System Testing - Test 1

    • Go to next step: If the specified state 
  6. Operate the component:S79P Window Switch - Passenger - Pulled=Up & Release

    Verify the component works as specified:M74P Window Motor - Passenger =Express Up

    1. Operate the component:S79P Window Switch - Passenger - Test all positions of the switch and verify that all according functions work properly.
    • M74P Window Motor - Passenger =Up
    • M74P Window Motor - Passenger =Express Up
    • M74P Window Motor - Passenger =Down
    • M74P Window Motor - Passenger =Express Down
    • If not the specified state 

      Refer to: Circuit/System Testing - Test 2

    • Go to next step: If the specified state 
  7. Operate the component:S79LR Window Switch - Left Rear - Test all positions of the switch and verify that all according functions work properly.

    Verify the component works as specified:M74LR Window Motor - Left Rear =Up /Down/Express Down

    • If not the specified state 

      Refer to: Circuit/System Testing - Test 3

    • Go to next step: If the specified state 
  8. Operate the component:S79RR Window Switch - Right Rear - Test all positions of the switch and verify that all according functions work properly.

    Verify the component works as specified:M74RR Window Motor - Right Rear =Up /Down/Express Down

    • If not the specified state 

      Refer to: Circuit/System Testing - Test 4

    • Go to next step: If the specified state 
  9. All OK.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.