MA7008O

Car is an European 1991 964 cabrio, and has two alarm boxes. Parts numbers are 928-618-260-00 and 000-043-203-18. It seem to be an 964 system updated to an 933 system.

I removed battery for a week while retrofitted and air conditioning system, and when putted everything together car would not crack.

It used to do the same before, just after turning the engine off, the little red led turned on and had to press the remote button to be able to start it again.

I have no idea how to reset the system, disable the immobilizer, or ……

There is an extra red led bellow the rear spoiler control that is kind of a switch, but, what is it used for? There is no immobiliser light on the dash.

I would really very much appreciate your kind help.