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HOMESERVICE MANUALSCHEVROLET2018TAHOE FL, 4WD, GASREPAIR AND DIAGNOSISBODY & FRAMEWINDOWSFIXED AND MOVEABLE WINDOW SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESLIFTGATE WINDOW RELEASE INOPERATIVECOMPONENT TESTING
2018 Chevrolet Tahoe FL, 4WD, Gas

Component Testing

2018 Chevrolet Tahoe FL, 4WD, GasSECTION Component Testing

Liftgate Window Unlatch Switch

  1. Ignition OFF, disconnect the harness connector at the S141 Liftgate Window Unlatch Switch.
  2. Test for infinite resistance between the signal terminal 2 and the ground terminal 1 with the switch in the open position.
    • If less than infinite resistance 

      Replace the S141 Liftgate Window Unlatch Switch.

    • Go to next step: If infinite resistance 
  3. Test for less than 3 Ω between the signal terminal 2 and the ground terminal 1 with the switch in the closed position.
    • If 3 Ω or greater 

      Replace the S141 Liftgate Window Unlatch Switch.

    • Go to next step: If less than 3 Ω 
  4. All OK

Liftgate Window Latch

  1. Ignition OFF, disconnect the harness connector at the M33 Liftgate Window Latch Assembly.
  2. Install a 10 A fused jumper wire between the control terminal 1 and 12 V. Install a jumper wire between the ground terminal 2 and ground.
  3. Verify the M33 Liftgate Window Latch Assembly activates
    • If the M33 Liftgate Window Latch Assembly does not activate. 

      Replace the M33 Liftgate Window Latch Assembly.

    • Go to next step: If the M33 Liftgate Window Latch Assembly does activate. 
  4. All OK

Relay Test

  1. Ignition OFF, disconnect the KR162 Liftgate Window Unlatch Relay.
  2. Test for 60-180 Ω between terminals 86 and 85.
    • If less than 60 Ω or greater than 180 Ω 

      Replace the KR162 Liftgate Window Unlatch Relay.

    • Go to next step: If between 60-180 Ω 
  3. Test for infinite resistance between the terminals listed below:
    • 86 and 30
    • 86 and 87
    • 85 and 30
    • 85 and 87
    • If less than infinite resistance 

      Replace the KR162 Liftgate Window Unlatch Relay.

    • Go to next step: If infinite resistance 
  4. Install a 3 A fused jumper wire between relay terminal 86 and 12 V. Install a jumper wire between relay terminal 85 and ground.
  5. Test for less than 2 Ω between terminals 30 and 87.
    • If 2 Ω or greater 

      Replace the KR162 Liftgate Window Unlatch Relay.

    • Go to next step: If less than 2 Ω 
  6. All OK
RENDER: 1.0x

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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.