Thanks for your feedback. My car is 4.5 years old. I have been able to reach the back of the Delphi alarm box, by lifting up the fuse box. Not possible to lift it up completely, as in the guide I mentioned previously, because on my model there is an additional loom that prevents this. I just had enough room to be able to disconnect the cable going to the Delphi box. Very hard to take the plug out of it. Did it with a plier. But you are right, the Delphi box seems to be fixed with a tamper-proof bolt at its lower point. The upper bolt is a normal one.
After disconnecting this Delphi box, I have no beeps any more and everything else seems to be ok, including the main alarm. By the way, I am not sure to fully understand the necessity of this Delphi Alarm. Probably a second level of security if somebody tries to disconnect the main alarm. But lifting the fuse box and cutting the Delphi cables with scissors can be done in less than 3 minutes, so it's not a very secure alarm and I won't take the pain to replace it or investigate further.
Had problem with my alarm, disconnected by the plug, which was not easy
S Type Alarm / Security sounder
in Jaguar S-Type Club
Posted
Had problem with my alarm, disconnected by the plug, which was not easy
and all my problems disappeared.