Factory Alarm Stereo Tamper Connection?
05-03-2019, 07:16 PM
#1
Burning Brakes
Thread Starter
Factory Alarm Stereo Tamper Connection?
Hello,
My car was broken into a while ago and the stereo was stolen (who steals a 1 DIN stereo these days?!). Anyway, I finally got around to installing a newer version of a similar Pioneer head unit, it was an easy job and I now even have digital radio!... However, after an hour or so of finishing and locking the car my factory alarm (key in door activated) started going off. I thought this was weird and cleaned out the door switches, opened and closed the front and back and decluttered the glove box just in case, then locked the car. Another hour or so goes by and the alarm goes off again!
I know that there is a tamper connection on the stereo of the 996 models, which is well documented, however, I can't find any info on whether there is something similar on the 993. Can anyone give me any pointers, and info on how to connect or disable this?
As I say, the new stereo is the same make as the previous one, which I fitted myself and had zero issues with.
Thanks,
My car was broken into a while ago and the stereo was stolen (who steals a 1 DIN stereo these days?!). Anyway, I finally got around to installing a newer version of a similar Pioneer head unit, it was an easy job and I now even have digital radio!... However, after an hour or so of finishing and locking the car my factory alarm (key in door activated) started going off. I thought this was weird and cleaned out the door switches, opened and closed the front and back and decluttered the glove box just in case, then locked the car. Another hour or so goes by and the alarm goes off again!
I know that there is a tamper connection on the stereo of the 996 models, which is well documented, however, I can't find any info on whether there is something similar on the 993. Can anyone give me any pointers, and info on how to connect or disable this?
As I say, the new stereo is the same make as the previous one, which I fitted myself and had zero issues with.
Thanks,
05-03-2019, 11:16 PM
#2
Rennlist Member
I've recently been doing some checking on the alarm / immobiliser and in the workshop manual there is reference to an alarm point on the right rear of the radio cradle.
You'll find a basic diagram in page 90 - 5 of the Diagnosis Manual and on 90 - 6
"8. Radio alarm contact
The alarm contact at the radio bracket connects the control unit to ground if the radio is pulled out of its bracket"
You'll find a basic diagram in page 90 - 5 of the Diagnosis Manual and on 90 - 6
"8. Radio alarm contact
The alarm contact at the radio bracket connects the control unit to ground if the radio is pulled out of its bracket"
05-04-2019, 04:06 AM
#3
Rennlist Member
You can use a Porsche compatible OBD tool to read out the alarm trigger event reason.
The alarm wire is connected to the frame of the radio. Just disconnect, isolate and tug away.
Cheers,
Tore
The alarm wire is connected to the frame of the radio. Just disconnect, isolate and tug away.
Cheers,
Tore
05-04-2019, 02:12 PM
#4
Burning Brakes
Thread Starter
Ok, I didn’t find the main green wire, but my loom had been spliced for my amplifier and speaker split. I did, however, find a small green wire hanging loose from above that would have been brushing up against the stereo case, so I taped up the end and tucked it out of the way. It’s been half a day now and no alarm, so fingers crossed. Thanks for the help.
There is a lot of discussion on “green wire syndrome” elsewhere if anyone else is having the same problem.
There is a lot of discussion on “green wire syndrome” elsewhere if anyone else is having the same problem.
