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Please can someone tell me why my door key will not disarm my 1996 olds aurora factory alarm system

As long as I dont use the automatic door locks when I exit the car the alarm won't go off, but if I forget and push the doorlock button and shut the door, well when I next open the door the alarm goes off. The car will start up but the horn and lights still continue to honk and flash. It will stop after about three minutes to save battery life but it is still armed. I found that I can disconnect the positive battery cable to stop it but I dont want to have to keep doing that. I would love a solution. please help me. Thanks so much.

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  • lisa fletcher Feb 14, 2012

    Thank you Mr Burbee, but my door key does not have a fob on it. only my ignition key does. I am supposed to be able to turn my door key all the way left (about 9 o clock) and hold for a few seconds and the door locks will be unlocked and the alarm disarmed.. for some reason the lock will not turn all the way left far enough to auto unlock all the doors or disarm the alarm. It will turn enough to unlock the driver door only. but not engage the auto unlock /disarm device though. I replaced the battery and it didn't help any. I was wondering if i could pull a door lock fuse maybe?

  • lisa fletcher Feb 15, 2012

    Thanks Mr. Burbee for getting back to me so quickly. I tried the wd 40 and no luck. Is there a door cylinder for each door? The auto lock and unlock feature with the door key is not working on the passenger door either. The disarm feature only works with the drivers door though, when it works. is it very hard to replace?

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  • Cars & Trucks Master
  • 1,871 Answers

Hello! There is a "pellet" in the key...A resistive pellet...Question is, have you tried another key? If more than one key has the same fault the ignition key cylinder is defective...Or the connector plug to the cylinder has dirty or broken pins/wires...However if it is just that one key a trip to the dealer to acquire a new one is in order...That connector has two wires...Colors are...Purple/White and White/Black...Send a comment...Guru...saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

Posted on Feb 11, 2012

  • David Burbee
    David Burbee Feb 14, 2012

    Hello! Knowing that the door cylinder lock/unlock/disarm will not turn the full distance results in a solution...The door cylinder needs to be replaced...However it may be reacting to cold climate and can be fixed with a shot of graphite or WD-40 into the key hole...Then work the key back and forth to see if it will turn the full distance...I'm thinking that it will...Otherwise a new cylinder AND key would be required...Send a comment...saailer

  • David Burbee
    David Burbee Feb 15, 2012

    Hello! The fact that the passenger door will not auto lock either changes the base trouble...There is a fuse in the interior box...B/U LP (15A) that powers a Light Green wire, in the Park/Neutral Switch connector...It is an input to the Remote Function Actuator Module only on Aurora's with this feature...Without this input nothing will work...If the fuse is good that set of contacts in the Park/Neutral Switch are suspect....I can not send illustrations via the comment box...If you have a volt meter and a wee bit of experience using it I'll provide a test procedure for you via e-mail....You e-mail will be kept private...Send an e-mail concerning the fuse to: saailer@ec.rr.com and I'll return illustrations and a procedure for you to test that portion of the Park/Neutral switch to insure it's condition before you buy one; cost is ($45)...saailer

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Door Key Switch
The BCM monitors the door key switches in order to disarm the CTD system. When the lock cylinder turns in order to unlock the door, the switch grounds the disarm input to the BCM.
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