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Thread: How To: Central locking fault (Now fixed)

  1. #1
    Join Date:  Apr 2015

    Posts:    40

    How To: Central locking fault (Now fixed)

    thought I'd share my unusual experience recently when my central locking became faulty by being able to lock together but wouldn't unlock together.

    As we know both the solenoids and control unit are prone to become faulty but upon some testing with a test light I wasn't convinced....

    My findings found that the brown/ silver (lock wire) earth signal wire was switching fine when operating the locks manually, but the brown/pink (unlock wire) wire was constantly earthed no matter if it was locked or unlocked...

    Ah! I thought, must be the switches inside the doors!?.... Nope! upon inspection they were operating perfectly,

    So I grabbed the lock wiring diagram followed the brown/pink wire and realised straight away what was at fault...

    The inertia switch under the dash was at fault!, on unplugging it the central locking returned to perfect working order

    I've ordered a new inertia but whilst I wait simply bridged the fuel pump wire..

    Thought this might be helpful to people as it's prob the last place you'd think to try before replacing expensive components.

    Last edited by minispeedstar; 06-04-2016 at 02:33 PM.

  2. #2
    Senior Member
    Join Date:  May 2011

    Posts:    554

    thanks for the post, finally I can show it to people without having to explain it myself over and over...

  3. #3
    Junior Member stranovegas's Avatar
    Join Date:  Jul 2011

    Location:  Las Vegas

    Posts:    22

    My VIN:    2147

    Club(s):   (LVDG)

    Wait... Im confused. My locking system seems to go haywire at times and it drives me mad. You're saying it may be the inertia switch? Where exactly is this located. Is it expensive??

    Sent from my HTC6500LVW using Tapatalk
    "Where we're going, we don't need... roads."

  4. #4
    TGTF (Too Greek to Function) AugustneverEnds's Avatar
    Join Date:  Jul 2012

    Location:  Syracuse, NY area

    Posts:    739

    My VIN:    SCEDT26T5CD010287

    Club(s):   (DMA)

    The inertia switch lives in the drivers footwell, on the upper left-hand side behind the carpet. It's a small black box with a plunger that should be pushed down or the fuel pump will not operate. This thing:
    Nick A.
    Νικος Αυγουστινατου

    1988 BMW 325iS
    1982 DeLorean DMC-12

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