Power lock issues

Discussion in 'Chevy Suburban Forum (GMC Yukon XL)' started by 78jeepstang, Apr 23, 2007.

  1. 78jeepstang

    78jeepstang New Member

    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. 84fiero123

    84fiero123 Epic Member 5+ Years 1000 Posts Platinum Contributor

    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.

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