Dropped key fob and batteries came out and now its lost its memory.Cant start car cos of immobiliser. Looked in fuse box to remove fuse but none listed.

Do not think u can turn it off on this model - u can try replacing batteries into fob - put key in door lock & turn to lock then press remote button to synchronise immobiliser & remote fob - will post this for now & check with my mate who has a Chrysler

ADDED: Just checked for u & the batts coming out should have NO EFFECT on the operation of the Immobiliser - it should work - but, if ur model has an on board factory fitted alarm - & that is connected to the immobiliser - if it has gone out of sync - it will need to be re programmed at a dealer - normally there is a sequence of button presses or key turns that will reset it - that info will be in ur handbook

Your fob losing its battery should not cause your 'key' to not start the car anymore - assuming the fob is a separate part from the key.

At the worst, you'd not be able to use your remote keyless entry.

If you could remove a fuse to disable the system - it would not be much of a security feature, would it?

If none of your keys will start the car, you will need to get it towed to a dealer where they can reprogram the car to recognize your keys/fobs.