Fox30

Dear,
I replaced an aftermarket Radio CD player with the new Blaupunkt Bremen SQR 46 DAB, wich is a new version of the original factory radio cassette in 1993.

Apart from that, my alarm sometimes goes off without any logical explanation.
I have seen in some threads that some Porsches have a link between the radio and the alarm module to detect a theft of the radio.
Can anyone help me if this is existing in my 1994 993 C2 carrera cabrio? I cannot find any lose cable in the radio area.
Many thanks

ToreB

Search for "Green wire", both behind the radio and on this forum.
The green radio alarm wire was/is connected to the original radio frame, and was grounded when the radio was pulled out. Aftemarket frames does not have this functionality. Isolate and tuck away the wire.
The Alarm/Door lock control unit has an event log and fault memory that will tell you the reason for the activated alarm. Use a Porsche-compatible OBD tool to read the codes.
Cheers,
Tore

jay@EZimmoblock.com

It may be that the green alarm wire is dangling unattached behind the dash, creating the intermittent alarm you're seeing. Here's what it looks like:

PFDGSB

4 years on this forum and have never heard mention of that wire. Thanks for the show and tell!

ToreB

The above picture shows a late Boxster/996 Brown/Blue wire with a green heat shrink tube on it, this is not how this looks like in the 993.
By the way, the 964 radio alarm wire is a stiff (most often green) wire looking like a coaxial cable. See this post for a picture.
Here's a picture of the 993 variant lent from the PFF forum:

jay@EZimmoblock.com

^^^ Of course! Grabbed the wrong "green radio wire" pic. Here's the one I meant to attach showing where that wire attaches to the 993 radio frame: