Power door lock issues

Discussion in 'Chevy Suburban Forum (GMC Yukon XL)' started by bluefiber, Aug 6, 2014.

  1. bluefiber

    bluefiber New Member

    I have a 2002 Suburban and recently developed problems with my power door locks.

    If I try to unlock the doors with the power lock switch or the keyless remote, only the driver's door unlocks.

    If I try to lock the doors with the power lock switch or the keyless remote, all the doors lock EXCEPT the driver's door.

    Any ideas?

    Thanks.
     
  2. RayVoy

    RayVoy Rockstar 3 Years 1000 Posts

    Try pulling the power door lock fuse (there may be a 2nd one for unlock) to reset the feature. Maybe something is out of sync.
     
  3. bluefiber

    bluefiber New Member

    No luck. Still hosed.
     
  4. oldmanstruck

    oldmanstruck Rockstar

    Here is the issue I have with the power door lock on my 2000 1500 (without remote lock)

    I use the key to open the door and I can use the inside door lock switch to unlock the passenger side door (for my wife or kid).
    Once the truck is moving, both door locked automatically (work as expected)
    After shut off, both door unlocked automatically (again, work as expected) BUT when I use the door switch to lock the door before shutting the door, it failed. When I press the poor lock switches on both door when the truck is off, I can hear a "weak" button clicking sound seems like the actuator is not getting enough power.

    It's very inconvenience since every time I stop the truck I have to climb over to the other side to lock the other door...

    I am not sure it's the actuator or not. If it is, why the door can lock itself when the truck started to move? Or is it the switch not working? Both switches have the same issue?

    anyone has input on this?
     
  5. bluefiber

    bluefiber New Member

    SOLUTION (finally!)

    I replaced both of the door lock relays on the interior fuse block. They are located together on the lower left of the diagram on the fuse block cover panel. Now the locks work perfectly.

    oldmanstruck, my lock acted in a similar fashion. Once the relays were replaced the actuators didn't perform weakly. I suspect that the reason for the weak performance is that the contacts within the relays were worn and were unable to conduct enough current. I suggest replacing the relays. The way I diagnosed the relays was by switching them around on the fuse block since they are the same. Everything worked differently at that point so I knew the relays were bad. Hope this helps!
     
  6. oldmanstruck

    oldmanstruck Rockstar

    I forgot to update this but I was able to fix my problem. I didn't pay attention on the fuse panel NOTE, which say if equip with power door lock without remote key lock, replace with 30A fuse.

    So I replaced the 3A fuse with a 30A fuse, everything works as expected now.
     

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