Centre console switch centre (BZM) and rear centre console switch centre (BZMF)

Brief description of components

Centre console switch centre

The control unit centre console switch centre has the following functions:

• CAN BUS interface to the vehicle electrical system
  
• Interface to the seat switches
  
• Interface to the controller
  

The control unit centre console switch centre is fitted in the front centre armrest.

Rear centre console switch centre

The control unit rear centre console switch centre has the following functions:

• CAN BUS interface to the vehicle electrical system
  
• Interface to the seat switches
  
• Interface to headphones
  

The control unit rear centre console switch centre is fitted in the rear centre armrest.

CAN BUS interface to the vehicle electrical system

The BZM and the BZMF are the interface between the ”vehicle electrical system - seat switches”.

Interface to the seat switches

The BZM/BZMF are connected by means of a ribbon cable with the switch blocks. The following functions are transmitted:

• • The operation of the seat switches is evaluated
    
  • The LEDs are activated
    

Interface to the controller

The controller is connected to the BZM. From a functional point of view, the BZM has nothing to do with the controller. The bus leads from the K-CAN SYSTEM, positive and earth supply are only looped through the BZM. The positive and earth connections to the controller are split between three separate leads in order to keep the continuous current load at the connector within the permissible limits.

Interface to headphones

(in the case of corresponding rear interior equipment).

The following inputs are read out by the BZMF and output via the CAN bus:

• Volume knob for headphones volume
  
• Search rocker switch
  
• Headphones detection