Hi Hope this helps someone in a similar situation. After being laid up over the winter with battery on trickle charge today I found the key fob/immobiliser was not working when trying to open the central locking and starting the car. After eliminating dea/flat batteries in both the key fob and on the car itself I noticed the flashing immobiliser LED on the dashboard was out. Under normal operation this should be flashing slowly so that pointed to the fuse (which turned out to be the culprit). The immo fuse is behing the passenger seat (on a RHD car) and shoud be a 5amp mini fuse. Replacing this recitfied the issue and afterwards you need to turn the ignition on and press the fob button 3 times within 10 seconds to re-sync the fob. Image Unavailable, Please Login Image Unavailable, Please Login
This begs the question “Why did the fuse blow”? I see from the wiring diagrams that the fuse supplies (hot) battery power to the Immobiliser ECU, the siren, the anti-lift sensor and the alarm system interface ECU. The last one is a mystery box with lots of jumper wires in it. Where the power goes from there (if it does), I'm not sure anyone knows other than Ferrari/Bosch.
God Bless You Kwilson, had a non responding car and sudden panic over old ferrari electronics. Found your post and my blown 5 amp fuse. All is well.
You two might want to take a look at your alarm siren and make sure it is not in the process of shorting out internally from a leaking battery. A possible reason for the fuze going.
