Door Locks Inoperative, Courtesy Lamp Operates

1980 Chevrolet Forward Control 5.7L Eng VIN M, Automatic Trans, Trans Mfr CD 400/M40SECTION Door Locks Inoperative, Courtesy Lamp Operates

With a test lamp grounded, check Orange/Black wire at relay connector. If light remains off, check circuit breaker and circuit to relay. With light on, press switch to lock position. If light remains off, check ground to the body. If grounded, replace relay.

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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.