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Power locks on 2000 Sliverado

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by jmichael, Aug 24, 2012.

  1. jmichael

    jmichael New Member

    All,

    I need some help in where to start troubleshooting issues with the power locks on a 99 (2000 bodystyle) silverado.

    Neither power door lock works. I can manually lock and unlock both doors just fine. when I press the L or U I do hear the relays click in the fuse box. I have the covers off of the fuse boxes and have checked all the fuses that I figured were part of the power locks....

    So I am not sure where to test.. I have the door pan off. I see I have 3 elec plugs that go to the door lock assembly. One of the plugs has 12 volt on it. It does not change when the L or U is pressed. One plug is for the door buzzer and the other one I assume is the switch... I am not sure how to test that?

    Can you guys help?
  2. PantheraUncia

    PantheraUncia Active Member 2 Years 1000 Posts

    I want to know the answer to this one too. I actually bought a left and right lock actuator online (delco) at $85 each (dealer was $170 each) and replacing that did not fix it in my 2000 Silverado. Exact same symptoms. I also checked the fuses and relays.
  3. Conlan Rose

    Conlan Rose Active Member 2 Years 1000 Posts

    Your truck may need to relearn the receiver you can find the instructions online it's really easy to do usually.
  4. Kady

    Kady Rockstar GMTC Chick 100 Posts

    That's kinda funny, I have the opposite problem. I can't get my doors to lock manually, but my power switch works...
  5. Conlan Rose

    Conlan Rose Active Member 2 Years 1000 Posts

    That just means the switch is probably dead or improperly connected. Check the connection and check if power is getting to the switch may require taking that part of your door apart.
  6. Kady

    Kady Rockstar GMTC Chick 100 Posts

    I have my door apart right now to replace my window regulator... But i have noooo idea how to check if power is getting to the switch..
  7. Conlan Rose

    Conlan Rose Active Member 2 Years 1000 Posts

    Use a multi meter and test the wire connectors and see the voltage and if it is drawing any amps
  8. jmichael

    jmichael New Member

    I don't have a key-less remote to try on this one, so I can't see how it has anything to do with relearning the fob.


    They are not locking when I press L or U on the driver or passanger doors... I do here the relay click.. just nothing at the door..

    I have 12 volts on one of the plugs...

    So I am guessing that one of the plugs going to the lock assembly has 12 volts, one is the indacator for the dome light and door dinger.. The other plug what is it supposed to do with L or U is pressed on the door? Know if it sets switch on or off.. could it be tested with a continuity tester?
  9. Conlan Rose

    Conlan Rose Active Member 2 Years 1000 Posts

    It should be able to test with continuity tester because it has to send signal somewhere.
  10. McClintoc

    McClintoc ɹoʇɐɹǝpoɯ Staff Member 2 Years 1000 Posts Platinum Contributor

    So, the buttons have power and when you press L or U you hear the actuators but the door doesn't physically lock/unlock? If that's the case and I didn't misread something, then it sounds to me like the actuators are disconnected from the physical lock.

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