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99 4Runner Limited Central Door Locks

Discussion in '3rd Gen 4Runners (1996-2002)' started by Fiiisherman, Mar 20, 2018.

  1. Mar 20, 2018 at 1:47 PM

    Fiiisherman [OP] New Member

    Mar 12, 2018
    First Name:
    1999 4Runner
    This is all about the Central Passenger Door Locking system.
    Can anyone tell me for sure the exact components that I have on my 99 4runner Limited.
    I have done a lot of reading on the subject, but there seems to be lack of information.

    I have the remote door opening system, but I can't program new remotes.

    On the 99....do I have a Body ECU located behind the Fuse panel in front of the driver's knees?
    Does this ECU have all of the door locking and alarm system incorporated in it?
    Do I have a plug in relay somewhere that controls the door locking?

    I have tried to program a remote door opener, but I am unable to get the door locks to cycle (unlock and re-lock) the required 5 cycles in 40 seconds..
    It's almost as if the door locking system gets tired and can't finish 5 complete cycles.

    When I try, the doors will unlock and re-lock (they are all acting the same) about 2 times and then the next cycle, they won't all cycle.
    On the 4th and 5th cycle, only the driver's door will cycle (un-lock and lock), and sometimes it won't fully lock and unlock.

    If I let it sit for about 30 seconds, the cycle will repeat.

    All of the openers are acting exactly the same, so I don't think anything is wrong inside the doors.

    It's not battery voltage because I added jumper cables off a good battery and nothing changed.

    I think that the problem must be in the relay????....Body ECU???.
    It almost like a relay coil or contacts are getting hot and causing a voltage drop to the locking motors.
    When I cools off some, they work better...not OK...but better.

    I would appreciate any advice or information
  2. Apr 11, 2018 at 7:30 PM

    Toyotayoda New Member

    May 8, 2017
    Atlanta area
    1997 SR5 4x4, 302k and counting
    Tacoma whip, 99 console box, tru trac., steering wheel, PWMS and HVAC control out of a 99.
    you have failing lock actuators, you can either replace them or call 3 friends and have them help you cylce the locks. It's difficult to get everyone in sync, but not impossible.

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