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Thread: 91 security system will not allow start.

  1. #1
    slowleak is offline Cadillac Owners Member
    Automobile(s): 1991 Allante
    Join Date
    Aug 2009
    Columbus MS

    91 security system will not allow start.

    How can I by pass? Any tricks? When starting there is no sound at all. The read out says security system will not allow start and to wait 3 minutes. After 3 minutes the same thing happens.

    Any help will be appreciated.

    BTW...the battery is showing 13.2 I don't think its a battery issue.

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  3. #2
    wcoates is offline Cadillac Owners Fanatic
    Automobile(s): 1989 Red Allante,
    Join Date
    Nov 2005
    Canfield Ohio

    Re: 91 security system will not allow start.


    I stay at Holiday Inexpress and steal all Allante info I can copy. Hope this helps, from Scott Flack from Indiana:

    Get an ohm meter and check the resistance across the resistor in your ignition key. Go to Radio Shack and buy 1/2 watt resistors that add up to the resistance you measured (within a few percentage points).

    Remove the kick panel above your feet on the driver's side. Look for two light gage white wires beneath the steering column. These wires go from the ignition switch to the VATS computer (which allows the car to start when it reads the correct resistance. Cut the two white wires and connect in your resistor (or series of resistors) to the two wires that run to the VATS computer. This will trick the computer into thinking your resistor in your key is being read. The car will then start, and you will have permanently solved your problem.

    Sometimes if you're lucky you can use a pencil eraser and clean the resistor contacts on your ignition key and get it to work. Most of the time though the wires have gone bad in the ignition switch where it contacts the resistor in the key. The procedure I described above bypasses this problem.

  4. #3
    c5 rv's Avatar
    c5 rv is offline Cadillac Owners Connoisseur
    Automobile(s): 91 Allante (gone), 06 SRX (gone)
    Join Date
    Jun 2003

    Re: 91 security system will not allow start.

    I think I've heard a similar discussion before...

    Spengler: Don't cross the streams.

    Venkman: Why?

    Spengler: It would be bad.

    Venkman: I'm fuzzy on the whole good/bad thing. What do you mean, "bad"?

    Spengler: Try to imagine all life as you know it stopping instantaneously and every molecule in your body exploding at the speed of light.

    Stantz: Total protonic reversal.

    Venkman: Right. That's bad. Okay. All right. Important safety tip. Thanks, Egon.

  5. #4
    carnut is offline Cadillac Owners Master
    Automobile(s): 1999 BMW 740 Il. 2005 Jag XK8, 1988 Mercedes Benz 300 SE
    Join Date
    Feb 2003

    Re: 91 security system will not allow start.

    Usually caused by worn ignition key. Chip loose in key. Try the spare. If no spare key, do a google on I do like WCOATS solution though.


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