Question about 1999 GMC Suburban

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How to repair locking mechanism on 1999

Have a 1999 suburban. Central door locking system does not seem to have enough energy to fully lock or unlock door motors. More you try to lock or unlock, weaker the power level becomes. Occasionally if left alone for a couple of days, seems to charge up and has almost enough power

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The locks do not operate with motors. They are individually operated by cylinoid switches which push or pull on the linkages. Older vehicles usually have these to fail in the colder months due to the thicker grease and sludge, etc. It sounds like your main control swithc is operating ok. You will likely have to take off the door panels and lubricate the linkages and switches and put anti corrosion grease (get at electrical supply place) on the wire connections. This will likely solve the problem or you may need to dissasemble and refurbish a switch as needed. If unable to rebuild, you will need to replace it.

good luck

Posted on Jan 06, 2009

  • Glenn Snow Jan 06, 2009

    PS. make sure there is no rust or corrosion on the door lock switch connections as this would reduce the electrical induction and operation of the switch.

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