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  1. #1

    Default Power lock issues

    I have an '87 GMC R2500 Suburban with some fun power lock issues. The front two doors are fine, they lock and unlock normally. The rear-seat doors don't do either, and the barn doors lock but don't unlock. I'm hoping to get this fixed before too much longer since its getting annoying! I haven't ripped things too far apart to check yet since it looks like it may be quite 'fun' to do, so I wanted to ask opinions first on possible causes. Thanks in advance!

  2. #2


    Could be a short or just a loose wire.

    Check fuses but I don’t think that’s it.

    To check the wires you need to take the door pads off, I wrote a thread on how to do that a while ago.

    Then just use a test light to check the wires for power, if I remember right they just change polarity. Positive on one side to lock and then + on the other side to unlock.

    Technology is great, when it Works,
    And one Big Pain in the Ass When it Doesn’t.
    Detroit Iron Rules, All the Rest are Just Toys.
    94 GMC Burban, 5.7L (350), 4X4, Auto
    86 GMC Burban, 350, 2 WD, Auto
    79 GMC pickup plow truck, 400, Full time 4X4, Auto
    86 Pontiac Fiero SE, 2.8L, Auto, only mid engine American car
    See a Pattern yet?

    15 year GM assembly line worker.

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