ChrisZilla

Just checking if anyone has had the same issue on an E55. When I lock the car with the key fob and come back the dome light is on. Didn't really notice until it started getting dark early. It usually has to sit for 30min before this happens and also a few months ago the siren would go off random but not loud even while driving so not sure if its related. Just checking before I send it in to the dealer

SICAMG

The battery in the alarm is dead and is factory sealed and none replaceable. System is mounted in the diver side front wheel well.

bobgodd

It's one of the easier DIYs.

Dokus

My cls did the same. It was the key fob battery for me, try that first.