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1990 Audi 100 key won't lock or unlock doors

I recently bought a 1990 Audi 100. The driver's side door can only be locked and unlocked by manually pressing the lock, or by turning the key in the passenger door. What's more pressing is that a couple days ago the key now won't unlock any door. I can manually press the lock which effects all doors, but the key has no effect. Turning the key in the driver and passenger door DOES engage and disengage the alarm though. I'm not even sure where to begin on this.

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This is usually caused by broken plastic parts in the lock system. The best would be to verify and lub all locks and check out the elecrical.
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kess v2

Posted on Mar 13, 2013

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If memory serves, the Audi's and VW's used a vacuum system to lock and unlock the doors and trunk, check to see if the vacuum pump (usually in the trunk in a styrofoam box) is working and if there are any leaks in the system

Posted on Mar 13, 2013

  • 1 more comment 
  • Dan Digrazia Mar 13, 2013

    Hmm. About how big is this pump. Didn't see it in the trunk. Perhaps under the rear bench seat? That's where the battery is.

  • Robert Levine Mar 13, 2013

    It's possibly under the seat, the pump is about 6"-8" square, they are pretty good about hiding it, sometimes behind a brace or above the wheel well

  • Dan Digrazia Mar 13, 2013

    I'll give it another look, but I'm losing light so might have to pick back up on it tomorrow.

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