I installed a piezo buzzer (instead of a siren, since I couldn't find one in Canada) and after locking or unlocking the buzzer gives off a faint high pitch tone. After a minute or two it stops.
The tone starts again in several scenarios:
- when a door/trunk/hood is opened/closed
- when a door/trunk/hood is left open it is continuous until you shut it
- when you unlock/lock another bmw (seems to be linked to the signal receiving end of the lock radio)
- and possibly when you drive the car ( i heard it only sometimes but the sound is very faint)
Anyone else notice this?
Wonder if its a result of using a buzzer instead of a siren.