Porsche GB Immobiliser Problems

[Gotham Man]

My 944Lux (1985.5)was fitted with a Porsche GB Immobiliser when only a few years old. Unfortunatly it's just started playing up. I'm now searching the web of a wiring diagram/fitting instructions to see if I can trace the fault.

My local main dealer couldn't help (apart from offering to sell me a new one - immobiliser that is). He thought the part number of mine was 999 999 795 01 but wasn't 100%.

Anyway if anybody out there in knows anything about these Porsche GB immobilisers or how to fault find them I'd really appriciate it.

Thanks (with fingures crossed).
Chris

[john ward]

On mine it was the receptacle for the little key fob thing. It cost about twenty pounds for a new one.

[911_OMG]

the little key fob immobilsers from the early to mid-90s were made by 'Hamilton and Palmer' for Porsche GB, so go directly to them and they should be able to help: http://hamilton-palmer.co.uk

[softinthehead]

what do you mean by playing up?

if its that it occasionally doesnt respond to the key - or gievs a short beep but fails to disengage the immobiliser?

2 common causes - one as above (key fob receptacle gets loose) the other is caused by (IIRC) the control box, located in passenger footwell, which is prone to getting damp.

as a short term solution, rub the tines of the immobiliser key with your tie a few times before inserting

[Henry-F]

Would mirror the receptor pins bending & requiring a replacement. I wouldn`t waste too much time or money chasing the problem as a replacement cat 2 immobiliser is probably only £120-130 fitted. You don`t say where you are based in the country.

Henry

[john ward]

The pins in the receptacle come loose and don't always make contact with the keyfob when you insert it. I went to the local Porsche dealer in Wilmslow. Part number 999.999.795.30, cost £19.04 inc vat, took me about one hour to fit it. No problems since. By the way, an auto electrician told me I needed a whole new system - so he's one to avoid if you're around Manchester.

[Henry-F]

A little harsh, most people wouldn`t know replacement receptors are available and it is a bit of a gamble changing them, especially if you are charging by the hour. There is also the risk that on a 10+ year old immobiliser you fix it only for it to later fail again on an unrelated matter and you are forced to mend it for free or else the customer accuses you of not doing the job properly.

As mentioned brand new cat 2 immobilisers are little more than £100 fitted and there will usually only be a token charge to remove the old system so if you are paying for the labour there isn`t much difference in price between supplying a new fully guaranteed system inc a certificate of installation with a current Thatcham approval number that your insurers will recognise instantly plus a set of 2 disarming "keys" and repairing your 10 year old 999 999 795 01/2 with 1 working key and a certificate long since lost !

There is a huge variation in quality of alarm / stereo / auto electrical repair engineers. One of the best if you are in southern England is In Car Electrics Apsley. 01442 219 319 ask for Paul or Carl & tell them Henry sent you. They are just off junction 20 of the M25.


Henry

[softinthehead]

john ward said:

The pins in the receptacle come loose and don't always make contact with the keyfob when you insert it. I went to the local Porsche dealer in Wilmslow. Part number 999.999.795.30, cost £19.04 inc vat, took me about one hour to fit it. No problems since. By the way, an auto electrician told me I needed a whole new system - so he's one to avoid if you're around Manchester.

john, I'm doing the same this weekend (or trying to) with mine - got the necessary part from hamilton palmer, isolated the wires behid the dash in the footwell etc, but Ive got stuck. I thought that the receptacle plug was threaded to screw in but on closer examination its not threaded but serrated, with the ridges angled to allow you to plug into the slot in the dashboard but not to pull it out again. a valid security measure I'm sure but how the bl**dy hell do you get it out of the dashboard fascia when you need to replace it?