Mercedes Benz 216 Networks of Control Units

· 1 Central gateway control unit
· 2 EIS [EZS] control unit
· 3 Left door control unit
· 4 Right door control unit
· 5 Left front seat control unit
· 6 Right front seat control unit
· 7 Rear control unit
· 8 Left front multicontour backrest control unit
· 9 Right front multicontour backrest control unit
· 10 Overhead control panel control unit
· 11 Front SAM control unit with fuse and relay module
· 12 Rear SAM control unit with fuse and relay module
· 13 Upper control panel control unit
· 14 TPM [RDK] control unit
· 15 Multicontour seat pneumatic Pump
· 16 PTS control unit
· 17 STH control unit
· 18 TLC [HDS] control unit
· 19 Keyless Go control unit
· 20 AAC [KLA] control unit
· 21 Backup camera control unit
· 22 Weight Sensing System (WSS) control unit (USA only)
· 1 Central gateway control unit
· 2 EIS [EZS] control unit
· 23 ME-SFI [ME] control unit (M273)
· 24 ME-SFI [ME] control unit (M275)
· 25 ESP control unit
· 26 Radar sensors control unit (SGR)
· 27 Steering column module
· 28 Vehicle power supply control unit
· 29 Restraint systems control unit
· 30 ABC control unit
· 25 ESP control unit
· 26 Radar sensors control unit (SGR)
· 31 Turn rate and lateral and longitudinal acceleration sensor
· 32 DTR controller unit
· 33 Night View Assist control unit
· 23 ME-SFI [ME] control unit (M273)
· 24 ME-SFI [ME] control unit (M275)
· 34 Intelligent servo module for DIRECT SELECT
· 35 Fuel pump control unit
· 36 Fully integrated transmission control (VGS) control unit
· 37 ETC [EGS] control unit
· 38 COMAND controller unit
· 39 SDAR control unit (USA only)
· 40 TV combination tuner (analog/digital)
· 41 Voice control system (VCS [SBS]) control unit
· 42 Universal Portable CTEL Interface (UPCI [UHI]) control unit
· 43 Amplifier for sound system
· 38 COMAND controller unit
· 44 COMAND display
· 45 Front central operating unit
· 1 Central gateway control unit
· 46 Emergency call system control unit (USA only)
· 1 Central gateway control unit
· 38 COMAND controller unit
· 50 Instrument cluster
· 3 Left door control unit
· 4 Right door control unit
· 12 Rear SAM control unit with fuse and relay module
· 13 Upper control panel control unit
· 20 AAC [KLA] control unit
· 23 ME-SFI [ME] control unit (M273)
· 24 ME-SFI [ME] control unit (M275)
· 27 Steering column module
· 45 Front central operating unit
Note
The illustration shows a vehicle with all the available special equipment
The network architecture in the CL-Class has been completely redesigned from that of the predecessor model series.
Compared with previous model series, the electronic of vehicle and electrical systems have been extended into new sub-networks and their tasks have been reallocated.
The central gateway control unit is responsible for coordinating the individual sub-networks (bus systems) with each other.
The sub-networks of the central gateway control unit include:
• Interior CAN
• Chassis CAN
• Front end CAN
• Central CAN
• Diagnostic CAN
In addition to the central gateway control unit, there are other control units that act as gateways:
• COMAND controller unit acts as gateway between central CAN and telematics CAN
• ME-SFI [ME] engine control unit acts as gateway between chassis CAN and drive train CAN
• ESP control unit acts as gateway between chassis CAN and vehicle dynamics CAN
The communications and information systems are networked over MOST and therefore allow synchronous data transfer.
The COMAND controller unit acts as the gateway between MOST and the central CAN.
Certain functions are controlled via LIN bus systems.
The following local interconnect network (LIN) single wire buses are used:
• Central operating unit LIN
• Door LIN
• Upper control panel LIN
• SAM LIN
• Air conditioning LIN
• Drive train LIN
• Alternator LIN
• Steering LIN
The air conditioning bus connects the sun sensor and the multifunction sensor with the automatic air conditioning control unit.
In addition to the diverse data transfer functions between the networks, the CGW also incorporates the following functions:
• Maintenance interval display
• Service processor
The diagnostic CAN connects the off-board test system to the interior CAN via the CGW and to the drive train CAN via the chassis CAN.
All control units have diagnosis capability and each one has its own internal fault memory.
The on-board electrical system management ensures that the power supply to all the electrical consumers and components in the vehicle is appropriate for the requirements and the situation.
The on-board electrical system consists of two onboard circuits:
• The starter battery circuit with starter battery and starter.
• The supply battery circuit with on-board electrical system battery and all electrical consumers.
The two on-board circuits can be coupled whenever this is necessary for the vehicle to operate.
The on-board circuits are separate primarily in order to safeguard the starting ability of the vehicle.
For this reason consumers other than the starter are only allowed to take energy from the starter battery circuit under certain conditions.
The two on-board electrical systems are separated or coupled by means of a coupling switch in the prefuse box beside the starter battery. The on-board circuit system is coordinated by the vehicle power supply control unit.
The vehicle power supply control unit is located in the right side of the trunk on the back of the rear seats above the on-board electrical system battery.
Its tasks are as follows:
• Connecting the two batteries in parallel via the coupling switch
• Charging the starter battery via a transformer
• Controlling the emergency mode of the on-board electrical system
The vehicle power supply control unit contains a pyrofuse to protect the on-board electrical network line to the front prefuse box. It is tripped by crash signal 2 from the restraint systems control unit.
The starter battery is located on the right in the engine compartment beside the air intake of the air conditioning system.
The vehicle is started exclusively via the starter battery.
Charging and jump-starting are also carried out via this battery.
The 35 Ah starter battery is not maintenance-free because AGM batteries in this power segment are not available on the market.

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