The terminal control is distributed across various control units. The following block diagram provides an overview of the control units involved and the integration in the vehicle electrical system.
KGM |
Body Gateway Module |
SV |
Rear distribution box |
CAS |
Car Access System |
M-ASK |
Multi Audio System Controller |
CCC |
Car Communication Computer |
DME |
Digital Engine Electronics |
DDE |
Digital Diesel Electronics |
IBS |
Intelligent battery sensor |
K-CAN SYSTEM |
Bus system for body functions |
MOST |
Bus system in the area of audio and communication |
PT-CAN |
Bus system for power train and chassis functions |
There are the following terminals:
Terminal 30:
Terminal 30 is routed from the battery terminal via the safety battery terminal to the front and rear distribution boxes. As soon as the battery is connected to the terminals, terminal 30 is live. Terminal 30 is at approx. 42 fuses of the distribution boxes.
Control units supplied by terminal 30:
AHM |
Trailer Module |
CAS |
Car Access System |
DME |
Digital Engine Electronics |
DDE |
Digital Diesel Electronics |
DWA |
Antitheft Alarm System |
EDC-K |
Damper Control |
KBM |
Body base module (up to model year 09/2006) |
KGM |
Body Gateway Module |
LM |
Light module |
SMBF |
Seat module, front passenger |
SMFA |
Seat module, driver |
SZL |
Steering column switch cluster (load) |
Terminal 30g:
Terminal 30g is controlled by the CAS. When the overall vehicle is wakened by an operation of the user, terminal 30g is switched on. Terminal 30g is automatically switched off after a codable after-run time (e.g. 30 minutes). The after-run time starts with the event terminal R Off. As in the case of terminal 15, a relay in the rear distribution box is activated by the CAS via a semiconductor switch. The relay of terminal 30g switches the battery voltage to approx. 26 fuses in the rear distribution box.
Control units supplied by terminal 30g:
ACC |
Active cruise control |
AL |
Active Steering |
ALBBF |
Active backrest width, passenger |
ALBFA |
Active backrest width, driver |
AMP |
Amplifiers |
ARS |
Dynamic Drive |
CID |
Central Information Display |
CON |
Controller |
CVM |
Convertible top module |
DAB |
Digital tuner |
DSC |
Dynamic Stability Control |
EGS |
Gearbox management |
EHC |
Height control |
EHB |
Electrohydraulic brake (as of model year 03/2007) |
EKP |
Controlled fuel pump |
GWS |
Gear selector switch (as of model year 03/2007) |
HKL |
Boot lid/tailgate lift |
HUD |
Head-Up Display |
IBOC |
Digital tuner US |
IHKA |
Integrated automatic heating and air conditioning system |
KHI |
Headphones interface |
LDM |
Longitudinal dynamics management (as of model year 03/2007) |
LWS |
Steering angle sensor |
NVE |
Night Vision Electronics |
PDC |
Park distance control |
TPM |
Tyre Pressure Monitor |
RLS |
Rain / driving light sensor |
SDARS |
Satellite tuner |
SHD |
Slide/tilt sunroof |
SHZH |
Stationary auxiliary heating unit |
SMG |
Sequential Manual Gearbox |
SZM |
Centre console switch centre |
TCU |
Telematic Control Unit |
TLC |
Lane departure warning (as of model year 03/2007) |
ULF-SBX |
Interface box |
VM |
Video module |
VTG |
Transfer Box |
Terminal 30g-f:
Terminal 30g-f is a terminal 30 that is only switched off of faults are detected.
As of model year 09/2005, the micro power module will be eliminated as an independent control unit. The KGM controls terminal 30g-f across a bistable relay that is firmly soldered on the board of the control unit. The bistable relay can be switched off or on. As a rule, the bistable relay is always switched on. The bistable relay has two relay coils and it always remains in the last state activated (switched on or switched off).
In the event of faults, before the KGM finally switches of terminal 30g-f, a reset is run for 10 seconds. This removes any failures of the defective control unit. If the fault is persists 5 minutes after the reset, terminal 30g-f is switched off.
There are the following three fault cases:
In all cases of the reset and cutoff, a fault is entered in the KGM. The reset or cutoff of terminal 30g-f is independent of what triggered the detected fault. The reset and cutoff are only an attempt to remedy the fault in the vehicle and prevent it from not starting. The reset cutoff of terminal 30g-f does not necessarily mean that there was a fault in a consumer unit of terminal 30g-f.
The switch-on condition for terminal 30g-f is switching on terminal R. For this reason, with terminal R or terminal 15, terminal 30g-f is always switched on.
Control units supplied by terminal 30g-f:
CA |
Comfort Access |
CDC |
CD changer |
Instrument cluster |
Instrument cluster |
M-ASK |
Multi Audio System Controller |
CCC |
Car Communication Computer |
CNAV |
Navigation system China |
JNAV |
Japan navigation system |
KBM |
Body base module (as of model year 03/2007) |
KNAV |
Navigation system Korea |
SZL |
Steering column switch cluster (electronics) |
TCU |
Telematic Control Unit |
ULF |
Universal charging and hands-free unit |
Terminal 15:
Control of terminal 15 is by the CAS depending on operation of the start/stop button (with the key inserted in the key slot).
The gearshift mechanism of terminal 15 is switched in the CAS via semiconductor switch. A relay in the distribution box is activated via the output of a semiconductor switch. The relay switches the voltage of the battery to approx. 4 fuses in the rear distribution box. The consumer units of terminal 15 are essentially supplied from here.
Control unit supplied by terminal 15:
FLA |
High beam headlight assistant |
For safety reasons, some control units have a terminal 15 line directly from CAS, e.g. the LM (light module) or the CVM (convertible top module).
Terminal 87:
The DME/DDE controls terminal 87 via a relay in the E-box or integrated supply module, as the case may be. Terminal 87 is switched on as soon as terminal 15 is switched on. After terminal 15 has been switched off, terminal 87 is switched off by the DME/DDE with a slight delay.
Control unit supplied by terminal 87:
VTC |
Valvetronic |
Terminal R:
Terminal R is not present as a hardware terminal. One control unit is directly supplied by the CAS via terminal R:
ACSM |
Crash Safety Module |