Mercedes-Benz S-class W221 (2005-2009) Most data bus circuit

1 2 IN OUT 2 1 OUT IN AUDIO TUNER CONTROL UNIT COMAND CONTROL UNIT FIBER OPTICAL CABLE CONNECTOR (MOST) MOST ORG/ WIRE SDAR CONTROL UNIT (IF EQUIPPED) UNIVERSAL PORTABLE CTEL INTERFACE (UPCI (UHI)) CONTROL MODULE (IF EQUIPPED) VOICE CONTROL SYSTEM (VCS (SBS)) CONTROL UNIT (IF EQUIPPED) WAKE-UP