MULTIPLEXED BSI OPERATING PRINCIPLE for the XSARA PICASSO AND XSARA The aim of this document is to explain certain functions of the BSI (Built-in Systems Interface). After presenting multiplexing, the following subjects will be dealt with: Electrical functions of the XSARA and XSARA PICASSO. − Signalling. − Interior lighting. − Driver's information. − Visibility. − Locking and unlocking. − Automatic climate control. − Immobilisation. − Radio system. Key: The dotted lines represent a connection used only by the diagnostic function. * Available as an accessory 8410 Radio BSI Built-in Systems Interface 8415 CD changer 0004 Control panel / Multifunction screen 8500 Navigation 8080 Automatic climate control 8600 Alarm For the XSARA Picasso, a MultiFunction Screen is incorporated into the control panel: • MultiFunction Screen type B, • MultiFunction Screen type C (for navigation option). There is no MultiFunction Screen on the XSARA. A communications protocol defines the rules and format of the exchanges between the various ECUs. The communications protocol used on the XSARA and XSARA PICASSO is the VAN.