5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHAlarm immobilizer and radio
Leading reported evidence
Check doors/hatches were shut)
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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Performed · outcome unconfirmed · Original poster
The alarm doesn't seem to function fully signified by the horn sounding (I have checked all doors/hatches were shut)
Leading evidence: 'Check doors/hatches were shut)' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check connections behind the stereo tonight' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion · Original poster
I will check the connections behind the stereo tonight when I get home.
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Suggestion · Original poster
I will also try disconnecting the alarm module to see if it can be reset that way.
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Suggestion · Original poster
I tried to disconnect the battery to reset the whole car but that just sets of the alarm off even though the car was open and I have tried it with the keys in the ignition switched on as well but both times it sets the alarm off.
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Suggestion
Changing the stereo shouldn't have caused any problem with the immobiliser, unless you have disturbed some of the wiring in the area of the ignition switch where the immobiliser transponder pickup is located.
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Suggestion · Original poster
I tried to disconnect the battery to reset the whole car but that just sets of the alarm off even though the car was open and I have tried it with the keys in the ignition switched on as well but both times it sets the alarm off.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Changing the stereo shouldn't have caused any problem with the immobiliser, unless you have disturbed some of the wiring in the area of the ignition switch where the immobiliser transponder pickup is located.
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
I tried to disconnect the battery to reset the whole car but that just sets of the alarm off even though the car was open and I have tried it with the keys in the ignition switched on as well but both times it sets the alarm off.
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5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Club GB: 1 discussions
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Generation: 20261026T222516Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Can anyone out there help me.
I tried to fit a new stereo to my 1999 GT3 but when I fitted it it didn't power up fully. So I went to put the ignition on and the car was dead it wouldn't start and it made no noise. I had some battery problem earlier in the year but you normally get a clicking sound from some relays if the battery is flat so I don't believe there is anything amiss there ( I have fully charged the battery as well just in case). I have tried locking and unlocking the car to reset it but no joy. I do get the horn sounding and a double flashing indicator on the dash now though. I have tried swapping back to the old stereo but the problem still persists. I tried to disconnect the battery to reset the whole car but that just sets of the alarm off even though the car was open and I have tried it with the keys in the ignition switched on as well but both times it sets the alarm off.
So I am left with the following
The car won't start seems like the immobilizer has kicked in
The alarm doesn't seem to function fully signified by the horn sounding (I have checked all doors/hatches were shut)
A new stereo now sat on a bench (Bench tested and works fine)
Can anyone suggest a way of reseting the alarm/immobilizer. Do you need to get the car reprogrammed to accept a different stereo.
I hope I have come to the right place I know it's a GT3 but my guess is the alarms/immobilizer/radios are the same across the range.
Regards Neil
Obviously your main concern is the fact that the car won't start, and I think you are right that it is an immobiliser issue. Changing the stereo shouldn't have caused any problem with the immobiliser, unless you have disturbed some of the wiring in the area of the ignition switch where the immobiliser transponder pickup is located. Also, if you have a spare key try that one too.
The factory-fit radio has a connection between the mounting cage and the alarm system control module. From memory, I think that connection should be insulated when you fit another stereo. If you have connected it to ground, it could be the cause of the single-beep when locking and double-flash of the LED .
The alarm control module is located under the passenger seat on a RHD car. You could try disconnecting it there, but I don't know if it would have a different effect from disconnecting the battery. A PST2 test would probably be the best bet to find out what's going on. Where are you located?
Thanks for trhe responce. I have tried the spare key but that gave me no joy. I will check the connections behind the stereo tonight when I get home. I will also try disconnecting the alarm module to see if it can be reset that way. I am located in Andover, Hampshire I guess the PST2 test has to be done at a dealer. Luckily I have porsche assistance still on the car so can probably get it towed to my nearest dealer. I am lucky that it isn't my main car.
I recall the same - there is aparrently an insulating "sticker" on top of the radio chassis. This stops the connection being made. If the connection is made, the alarm thinks the stereo is being stolen.
Look on top of the old unit for a sticker, and use something to reproduce this on the new one.
