Electrical Connection
The head restraint is connected to the safety system control unit by a two-core cable.
Therefore, the head restraint has a catch which prevents it being raised beyond its highest adjustment position and removed from the seat.
The safety system control unit on the E60, E61, E63 and E64 is the ACSM (Advanced Crash and Safety Management).
The control unit for the safety system on the E83 is the MRS (Multiple Restraint System) control unit.