Remote control detection by the vehicle can among others be malfunctioning under the following circumstances:
Replace the battery
Do not transport the remote control together with metal objects or electronic devices.
In the case of a malfunction, unlock and lock the vehicle using the buttons of the remote control or using the integrated key.
BMW X3 Owners Manual > Seats: Manually adjustable seats
At a glance
Forward/backward
Thigh support
Seat tilt
Backrest width
Lumbar support
Height
Backrest tilt
Forward/backward
Pull the lever and slide the seat in the desired
direction.
After releasing the lever, move the seat forward
or back slightly making sure it engages ...