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Join Date: Nov 2007
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944 immobilizer problems

Hello there,
I have been browsing your forums for a while now and really have appreciated all the time and effort a lot of you put into helping each other out and I hope that I can be as useful over time!

As a relatively new 944 owner (6 months) I have been thrilled by how good my 944 2.5V lux is as a daily driver until the other day when my immobilizer decided to, well, immobilize my car permanently.

It is a UK car and has a 3-pin "chip" type plug in the dash board that you plug in to for about 3 secs before you want to go anywhere but mine has now decided not to let go and the car will not start at all - nothing.

There are no lights on the dash when the immobilizer is "doing it's job" and I have managed to separate the entire immobilizer physically from the car (it was under the front L/H carpet) but have no idea on what I need to do to remove the whole circuit from the car as it appears that is in addition to the standard alarm unit that came with the car (the key aft of the drivers side door).

Anybody know anything about where I should go with this as I am happy to leave the alarm in but take the immobilizer out.

Overall, the car is awesome and great as a cheap daily driver but I am a bit stuck right now.

Thanks in advance for any help and hope I can help some of you out in the future.

Shaggy

Last edited by Shaggy944; 11-17-2007 at 10:28 AM..
Old 11-17-2007, 10:15 AM
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as a quick note, when the immobilizer is active the light on the dash is flashing away as normal. When you put the "key chip" into it - the red light goes solid whilst it's in there but when you take the "key chip" out, instead of extinguishing the light so you can start the car, the red light returns to flashing status and you can't do anything with the car except listen to the stereo!
Old 11-17-2007, 10:18 AM
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Sounds a lot like the Porsche dealer installed "Hamilton and Palmer" (Thatcham approved) alarm. Call your local Porsche dealer to check.
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Old 11-17-2007, 04:54 PM
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can I remove the unit and just have the standard porsche alarm or should I replace the immobilizer (if I can find one!!??)

Shaggy
Old 11-18-2007, 03:03 AM
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Without knowing what type of device this is, or who may have installed it. You might be able to figure it out on your own.

Starting with the 'immobilizer key' slot, the back of the unit should have a ribbon cable attached. Follow the ribbon cable to a box, this box(immobilizer control unit) will have larger wires coming out of it. These wires will end up going to the ignition harness. At the ignition harness you will have at least one wire that is cut, and spliced into the wires going back to the immobilizer box. If you simply remove all the immobilizer wiring, and re-attach the cut wire(s), you will end up permanently bypassing the immobilizer, and put the car back to factory wiring.

It is possible that the immobilizer control unit wiring is going to the passenger footwell, as that is where the factory alarm is/was.
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86 Porsche 951 - LR 3" Exhaust, MaxHP chips and ProfecB @ 15psi
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Old 11-18-2007, 05:18 AM
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That's what I was thinking. It's just a case of tracing the wires back to where they were "cut" and reattaching them.

I will be having a go at this later in the week so will keep you posted.

BTW - anybody any idea as to what wire to the ignition circuit is likely to have been "cut"

Shaggy
Old 11-18-2007, 09:24 AM
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dodgy wires?

Last edited by Shaggy944; 11-20-2007 at 03:36 PM..
Old 11-18-2007, 09:25 AM
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It sounds very much like the Porsche dealer installed one, all the wires are black and soldered heat shrunk into the wiring harness. Call the dealer.
Having seen how these were installed, don't even think of cutting any wires until you know exactly what you have. The whole point of these alarms was to make it as difficult as possible to by-pass. They were approved by all the insurnace companies.
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Old 11-18-2007, 01:16 PM
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dodgy wires?

Last edited by Shaggy944; 11-20-2007 at 03:37 PM..
Old 11-19-2007, 02:57 AM
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Good luck, I was lucky enough never having to install those alarms.
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From November 2012; Precision Porsche Specialist
Sussex UK, +44 (0)1825-721-205
2001-2012 Gerber Motorsport Inc. 206-352-6911
07.15.06 1996 Ducati 900SP. Suprisingly enough, it's red
08.16.09 1999 Kawasaki ZRX1100. Green.
Old 11-19-2007, 10:39 AM
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Those devices are all pretty much straight forward. You probably have 4-5 black wires coming out of the box. 1 wire should be ground, 2 Should merely be spliced into ignition harness wires(constant power, and ignition power) and can simply be cut and have the factory wire taped back up. The other 2 wires are for the starter wire, this is the wire that would of been cut and attached to the black wires for the box. You'd just have to cut off the black wires, and re-connect the starter wire back to itself.
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86 Porsche 951 - LR 3" Exhaust, MaxHP chips and ProfecB @ 15psi
83 Porsche 944 - Still under re-construction.
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Old 11-19-2007, 12:27 PM
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will be bravely trying this removal tomorrow so will take some pics and upload them so you can see how I get on!
Shaggy
Old 11-19-2007, 01:26 PM
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Jack,
Have you ever seen the Porsche dealer installed UK alarm system?
The whole concept was to hide all the wiring, nothing was marked and all the wiring is black and spliced into the factory harness in the most inacessible point. (which was aslo determined by Porsche)

Wait until Shaggy posts the pics.

I don't remember the labor time (becasue I didn't do them, mainly because you also had to be Porsche certified to do it.) On a 993, I think labor itme was around 6 hours.
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From November 2012; Precision Porsche Specialist
Sussex UK, +44 (0)1825-721-205
2001-2012 Gerber Motorsport Inc. 206-352-6911
07.15.06 1996 Ducati 900SP. Suprisingly enough, it's red
08.16.09 1999 Kawasaki ZRX1100. Green.
Old 11-19-2007, 02:02 PM
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Quote:
Originally Posted by Britwrench View Post
Jack,
Have you ever seen the Porsche dealer installed UK alarm system?
The whole concept was to hide all the wiring, nothing was marked and all the wiring is black and spliced into the factory harness in the most inacessible point. (which was aslo determined by Porsche)

Wait until Shaggy posts the pics.

I don't remember the labor time (becasue I didn't do them, mainly because you also had to be Porsche certified to do it.) On a 993, I think labor itme was around 6 hours.
It doesn't sound any different than the stuff we did when installing aftermarket alarms. The immobilizer systems were the easiest, as they did have the fewest wires, but hiding a system like that is no where near as hard as it would seem.

If it would of been a system I installed, he wouldn't of been able to find the brain box as easily as he did. I would of hid it behind the dash gauge cluster, and picked up the ignition wiring from up there, making the system completely invisible from under the dash.

It doesn't matter who has approved the systems, as the systems are still only as good as the installer putting it in.
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86 Porsche 951 - LR 3" Exhaust, MaxHP chips and ProfecB @ 15psi
83 Porsche 944 - Still under re-construction.
08 Suzuki Boulevard M109R LE
02 Nissan Altima SE3.5
Old 11-20-2007, 12:38 PM
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latest update-
I swear my car is possessed!

I guess there must have been a loose wire somewhere because a quick final "test" before I decided to take the plunge showed the immobilizer is working fine again and the car starts fine!

I'm not complaining but just praying that this don't raise it's head again when I'm out and about.

Any ideas what happened to it?

Shaggy
Old 11-20-2007, 03:43 PM
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Quote:
Originally Posted by Shaggy944 View Post
latest update-
I swear my car is possessed!

I guess there must have been a loose wire somewhere because a quick final "test" before I decided to take the plunge showed the immobilizer is working fine again and the car starts fine!

I'm not complaining but just praying that this don't raise it's head again when I'm out and about.

Any ideas what happened to it?

Shaggy
Clean the contacts in the immobilizer port, and on the key itself. The key is merely a resistor inside that key, it only actually uses 2 of the 4-8 connectors in the socket. So if there is any corrosion that can change the resistance value, that'll pretty much leave you stranded.

The only other thing is that the brain box could have an intermittent issue and is dying a slow death. Up to you what you do with it at that point. Check with the manufacturer, here in the US most of those devices come with a lifetime warranty.
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Jack
86 Porsche 951 - LR 3" Exhaust, MaxHP chips and ProfecB @ 15psi
83 Porsche 944 - Still under re-construction.
08 Suzuki Boulevard M109R LE
02 Nissan Altima SE3.5
Old 11-21-2007, 02:02 PM
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I have cleaned up all contacts and I think that's what might have done it.

Like I say, I PRAY that this doesn't rear it's ugly head again when I'm out and about.

Thanks all,
Shaggy
Old 11-21-2007, 04:56 PM
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