1 -  Heated windscreen control unit -J505-
2 -  CD changer -R41-
3 -  Fresh air blower control unit -J126-
4 -  Headlight range control, control unit -J431-
5 -  Radio -R- not for navigation system
5 -  Navigation operating electronics control unit -J402- for navigation system RNS-D only
5 -  Control unit with display for radio and navigation system -J503- for navigation system RNS-Low only
5 -  Navigation system with CD drive control unit -J401-
6 -  Telephone and telematics control unit, telematics -J526-
6 -  Language input control unit -J507-
7 -  Steering column electronics control unit -J527-
8 -  Front passenger side door control unit -J387-
9 -  Display control unit in dash panel insert -J285-
10 -  Airbag control unit -J234-
11 -  Driver door control unit -J386-
12 -  Convenience system central control unit -J393-
13 -  Onboard power supply control unit -J519-
14 -  Motronic control unit -J220-
14 -  Diesel direct injection system control unit -J248-
14 -  Simos control unit -J361-
15 -  Automatic gearbox control unit -J217-   not for models with multitronic®
16 -  ABS control unit -J104-
17 -  Automatic gearbox control unit -J217-   for models with multitronic® only
18 -  Radiator fan control unit -J293-