Question about 1989 Porsche 944

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Alarm bypass. alarm system faulty

Please advise how to bypass the alarm system on my 944S2 1989. Its more sophisticated than the earlier models and uses the 928.637.104.05 USA control unit with different terminal configuration from the ones shown on Clark's garage alarm bypass page. I would really appreciate it if you could tell me which pins to bridge in order to bypass this alarm system. Thanks in advance John
PS another number on the control box is 5AA 004 502 05

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  • johnharris Dec 29, 2008

    To clarify, my Porshe 944S2 1989, has an ordinary key, not electronic. All I want to do is bypass the anti-theft alarm sytem to avoid an alarm-fault problem. Clarks garage shows a nice photo of the 2 jumper wires needed but for an earlier model. My model has red led's in the door locks. My alarm control box looks identical to the clarksgarage.com "bypass alarm" specimen but has the different part number 928.637.104.05 USA. The pins and numbers are slightly different. Thanks in advance John

  • johnharris Dec 30, 2008

    are we on the same page? I have no truck and no black button near the hood release. I need to know which pins to jump. Thanks John

  • johnharris Dec 30, 2008

    The 944S2 Dme control unit won't function with those open circuits. Thanks for your input

  • johnharris Dec 30, 2008

    Bluextc3221 you are a gentleman and a scholar. This material is incredible. The zoomed-in wiring diagram shows 2 pins to jump. Fortunately, there is just enough of the diagram to show the number of an alarm relay. Now I just need to figure out the pins to jump when I remove the alarm relay. Wow, the workshop manual engine troubleshooting detail you included is something I've always wanted. Many thanks John

  • marvin581 Apr 13, 2009

    i have the same problem my module ends 003 but i have the leds in the doors did you solve your problem with the correct bypass i tried the one on clarks but it started making the brown wire melt

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This had been done many times before.... But it is VERY involved and you HAVE to know what your doing. To bypass the little "chip" in the key, you have to know its resistance value in ohms, then you get a resistor of the exact same value and put it in-line in the wire that reads the chip in the ignition. Then you have tricked the system into thinking that the right key is always there. Like I said you have to know what wire it is, what kind of resistor, and what value to put in. However the payoff is no more expensive keys....keys without the chip will now start the car, sience you have tricked the passkey system into thinking the key has the chip in it.

Posted on Dec 29, 2008

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You should have a black button under the driver side dash down by the Hood release that is the kill switch for the alarm if you hold that down while starting the truck it should keep the alarm from sounding and killing the engine. 

Posted on Dec 29, 2008

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Take it to a car dealer and have it checked out might be a faulty or dead Alarm System that needs replacing

--P3NGYJ03

Posted on Dec 30, 2008

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Why don't you just try unplugging the harness from the control box and see if the car starts and runs and everything works. I know on the late 80's early 90's Mercedes Benz' thats all it took to disable the alarm and starter lock out.

Posted on Dec 30, 2008

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