Good afternoon, I took out my '96 Swiss car today the first time this year, it was garaged 1 year with the battery switch off. Before I started it, I put it onto the charger with the battery sswitch on; within 10min the charger showed fully charged. After another 2h on the charger, the engine immediately started and engine runs fine, but I realized the Immobilizer LED stays on with the engine running. The previous 7 years, the LED was only on before firing then went off with engine on. Is there a backup battery in the Immobilizer which maybe went south? Many thanks for advice.
Yup that is exactly what probably happened. Bunch of threads in the archives on this, and the solutions for it.
Probably I just need to replace the siren battery... https://www.ferrarichat.com/forum/threads/f355-alarm-siren-battery.441673/ My Immobilizer booklet states that the door or hood is open when the LED is continously on (after 6s off though). Seems the booklet editor did not consider a failing siren battery as a probable scenario back in the days... Image Unavailable, Please Login
I would suggest giving the system some time. Maybe the siren battery will charge. I had a situation where the light was staying on. But then, after a period of running the car, and probably trickle charging it*, that light has gone off, and stayed off. Otherwise it functions normally, blinking when the car is not running etc. *I trickle charge 100% of the time. I think something came loose with the charger the one time I had the problem you describe.
Hi Pepsi 10, many thanks for the input. I drove the car now 3 days and 200miles, still the LED is on continously. I guess the immobilizer/siren battery has to go...
You need a new siren. Simple fix. ______________________________ ferrarifobs.com Key fobs for the 355, 360, 456, 550 and 575
Good afternoon, simple fix indeed (in theory). Unfortunately the 2 bolts-heads (I hope these were bolts ?) holding the upper and lower half of the plastic casing together were super corroded beyond recognition, I guess water stood in there for 2 decades or so. Took me an extra hour, a drill and some cracked plastics to get it open . The battery was then found leaking with electronics still good. Here is the link for my spare-battery: https://www.espspecialbatteries.co.uk/battery/ESP-7-46-722D.
