Power Windows: Description

1987 Chevrolet Suburban R20, 7.4 N, 400/M40SECTION Description

Each power window is moved by a single permanent magnet motor. The direction in which motor turns depends on the polarity of the voltage applied. A master power window switch is located on driver's door. Each passenger window switch controls only the window at that passenger's position.

All power window motors have a self-resetting circuit breaker built into them. The circuit breaker allows the motor to be stalled without damage. No travel-limit switches are used.

The tailgate window is operated by an instrument panel mounted switch or by an external key switch located in the tailgate door. The window retracts into tailgate door.

A cut-out switch prevents operation of the window by either switch when the tailgate is open. Circuit is protected by a 30-amp circuit breaker, located at fuse block.

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:

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