1988 Chevrolet Hi-Cube 5.7 M, 475/M40FACTORY OEM SERVICE PROCEDURE

Passenger Side Window Will Not Work

  1. With ignition switch in "RUN" or "ACC" position, check for voltage at passenger side switch. If there is no voltage, find open between switch and fuse block. If okay, go to next step.
  2. With voltage applied to Pink wire at the switch, move switch to the "UP" position. Dark Blue wire should also have voltage. If there is no voltage, replace switch. If okay, go to next step.
  3. With power window switch in the "UP" position, check for voltage on Dark Blue wire at power window motor. If there is no voltage, find open between switch and motor.
  4. If there is voltage on Dark Blue wire, connect a grounded jumper wire to Brown wire at the motor. If motor runs, find open in ground circuit. If motor does not run, replace power window motor.
Factory Service Tools

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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.

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