Perry 951

Since there is little in the archives on this, I am gonna post what I found.

86-88 Cars

The Control box is above the DME in the passenger compartment. It is a 3"x5"x2" black box with blue lettering, and has 2 connectors. One connector has 2 wires and is the output of the control brain. The other is an 8 pin connector for the various inputs. To disable, unplug both connectors and with a jumper wire, jump pin 1 (green) to pin 4 (red/black). The early cars do not have a fuse or relay to bypass the alarm control.

89 and later cars

There are 3 components to the alarm. The control box, a fuse in the main panel, and also a relay in G18. Assuming the fuse and relay are fine, remove the connectors as stated above. (control box also above the DME) Jump pins 7 and 8. If it still won't start, try jumping 4 and 6 as well.

Since I do not have a later car, I do not have the wire colors, but other posts have said this procedure works just fine.

Happy disarming!

rihaa

What exactly does this disable in terms of the alarm? I have been having issues with mine going off for no reason and not stopping recently. I would still like the fuel pump to be disabled if possible but somehow disable the rest of the alarm system. Doesn't necessarily seem possible, but I can always hope.

What exactly does this method of disarming the alarm do?

Perry 951

If the alarm has a malfunction, it disables power to the fuel pump, as you noted. Unfortunately, if it fails when you need to go somewhere, you are out of luck unless you bypass it, or repair the malfunction.

951Tom

Does the whole alarm wiring harnesses exist on all cars? Yesterday I found the two wires in the body where the on/off key switch would be near the drivers door handle.

Perry 951

Yup.. all 951's have provisions for alarm and all optional equipment.

Bruce '89 s2

See the post "Servicing & tyre pressures"
If my son had had that information it would have saved him £600.
Disconnecting the battery had the effect of the alarm system cutting the power to the coil (and presumably the pump)even when the battery was re-installed

Perry 951

I am very sorry I could not get this to you sooner. Unfortunately, there is little info about the factory alarm setup.

MadMax

Just an addendum to Perry's post...the info his passed is only good for models up to 1990. The 1991 S2's have the exact same alarm setup as the 968 and it is very different than the 944. The control brain and alarm module is under the passenger footwell by the DME and there are two specific boxes and wiring harnesses. I am not sure what year Porsche changed/moved the alarm system. I believe it began with MY 1991 but it could have effected some of the late 1990 MY S2's as well. The easy way to find out is to look at your steering column under the dash. If you alarm system control module is mounted to the steering column then you have the older system...if there is no box then your alarm system is mounted under the passenger footwell.

Also, not all 944's (S2's specifically) are wired for the old style keyed "ungo" alarm system. I know for a fact that the S2's do not have the wiring for the body mounted key on the driver's side. For S2 owners with the 968 style alarm system you will need to get the wiring diagram of the alarm system for a 968 as there is no information in the S2 wiring diagram covering this. Porsche made the change and did not include it in the tech manuals for the 944. the 968 tech manual must be used. The S2 is electrically identical to the 968 NOT the normal 944 (at least this is true for the MY 1991 S2's).

%0

rihaa

This post kinda went by the wayside for a while, but after reading mad max's post I would like to know if anyone has any more info on the MY 1991 alarm. Lately mine has been tripping for no reason and then it will not turn off. This is a real pain in the middle of the night when you aren't in sight or sound of your car and it just keeps going.

Anyways, I wanted to disable the alarm, I am almost certain I have the new style alarm. I have no external key for the alarm, it is all through the actual door lock mechanism that it disables itself.

I was hoping to get this done within the next day or so. Also if anyone has a wiring diagram for the 968 that would be awesome.

951Tom

I've heard stories of thieves keep going by at night and setting off the alarm at 2am. Then the owner gets pissed, thinks his alarm is malfunctioning and disconnects it. Then the thieves return and easily steal the car cuz the alarm is off. Just a story I heard.......

rihaa

Nice thought, but I know that to not be the case. The other thing is that our alarms are only supposed to trip if one of the seals at the doors, radio, hatch, sunroof, or hood is broken. Therefore you would think that they wouldn't go off very often unlike the proximity ones where they go off because you got within 5 feet of them or the ones that go off if a tennis ball hits it.

Anyways, still looking for some help on doing this with the later model alarm.

rihaa

Nobody out there with any info on the later model alarm?

wesmc3

bump. Looking for 968/s2 alarm bypass.

kingston944

They can steel mine if they like, then a Turbo or LS1 . LOL Clarks has good info on alarm. So are the alarms any good ? I think that people who steel them or any car know how to do it any way .My best friend owns the Volvo and Mercedes dealer and they stole a new Benz not sure of the model but it was $110.000.00 car and the alarm did knowing to stop them . No one heard a thing ?

odurandina

i've got a ghost in my alarm. time for this baby to go.

now for a how to? this is not a 9-4-4. it's a 968.