Question about 2004 Chevrolet TrailBlazer

2 Answers

The power door locks stopped working on my 2004 Chevy trailblazer EXT. It is a 6 cylinder key fob doesn't work. hatch won't open. fuse under rear seat is not blown.

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  • jwopata Sep 03, 2010

    I will do the battery thing, but some new info.



    The door switches do work. THe doors lock and unlock automatically when the car goes in and out of drive. None of the keyfob functions work

    1.

  • jwopata Sep 03, 2010

    door locks work automatically when car is in and out of park

    door locks work with the door switch



    None of key fob funcions work

    1. door lock

    2. hatch lock

    3. alarm



    I will try the battery reset

  • jwopata Sep 03, 2010

    battery "reset" did not fix problem.



    Rear wiper/washer does not work either



    i have rear seat fuse box open

  • jwopata Sep 03, 2010

    Updated info:
    1. unhooking battery did not help
    2. Door locks work with door switches, just not keyfob
    3. Doors lock/unlock automatically (as programmed) with car in and out of park
    4. Rear hatch does not open with outside button or key fob
    5. rear wiper and washer system does not operate

  • jwopata Sep 06, 2010

    The problem turned out to be in the wiring harness to the hatch. I unplugged the wiring harness connector to the hatch and reconnected. Everything started working.

    No further action needed.

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This is something that the dealer may have to reprogram. If you do not have an Owner's handbook, please feel free to let me know so I can get one to you. Do you have a display on your instrument panel saying "Battery low"? This is an indicator oif the key fob battery being low. Also if you had to stand real close as of late to get it to respond, it is an indication of the key fob battery low. Let me know.

Posted on Sep 03, 2010

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  • Master
  • 2,272 Answers

Sounds like body computer is malfunctioning or the module that controls the door locks lost it's program.Disconnect the battery for few minutes then reconnect and check.In some cases this resets the system computer and all starts working.But if that does not helps then problem has to be checked with the power door lock system.Either a power door lock actuator or the power door lock switch. Usually the most common problems with power door locks are the actuators. They are small electric motors used to lock and unlock the car doors when activated by a switch or remote. Like any electric motor sooner or later it will fail. Replacing an actuator involves removing the interior door panel for access. Some are part of the door latch and some are independent.
Either way, door lock actuators need to be replaced if they are buzzing, working only in one mode or are not working at all. if the problem is with the door lock actuator or just the switch. If a All the door locks, only work when locking and NONE of them work to unlock, then the switch is most likely the cause.

Thanks. Keep updated for any more query. You can rate this solution and show your appreciation

Posted on Sep 03, 2010

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