Power Door Locks: Description

1981 GMC Vandura Special Automatic Trans, Trans Mfr CD 400/M40SECTION Description

The electric door lock system consists of a lock actuator assembly at each door, conventional switches and a relay. All doors lock and unlock manually or from the door control switches. All components are serviced as complete assemblies. The motor is a permanent magnet, 12 volt reversible type that is protected by an internal circuit breaker which may require 1 to 3 minutes to reset. A 30 ampere circuit breaker also protects the door lock feed circuit to relay wiring. The relay assembly is a double-pole, double-throw relay externally grounded to body beneath the right side of the instrument panel behind glove compartment. The control switch is a three-pin rocker type mounted on door armrests. The feed circuit to the lock switches is protected by a 20 ampere fuse.

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

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.