Energy Diagosis As of 09/05

Energy Diagnosis: Terminal Control As of 09/05
The terminal control is distributed across various control modules. The following block diagram provides an overview of the control modules 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 (depends on level of equipment)
CCC Car Communication Computer (depends on level of equipment)
DME Digital Engine Electronics
DDE Digital Diesel Electronics
IBS Intelligent battery sensor (depends on level of equipment)
K-CAN SYSTEM Bus system for body functions
MOST Bus system in the area of audio and communication (depends on level of equipment)
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 modules 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 modules 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 Transmission control
EHC Ride-level 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 Trunk 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
RDC Tire Pressure Monitor
RLS Rain / driving light sensor
SDARS Satellite Tuner
SHD Slide/tilt sunroof
SHZH Stationary auxiliary heating unit
SMG Sequential Manual Transmission
SZM Center Console Switch Center
TCU Telematic control module (as of model year 09/2006, except US version)
TLC Lane departure warning (as of model year 03/2007)
ULF-SBX Interface box
ULF-SBX-H Interface box High
VM Video module
VTG Transfer Case & Special Transmission

Terminal 30g-f:
Terminal 30g-f is a terminal 30 that is only switched off if faults are detected.

As of model year 09/2005, the micro power module will be eliminated as an independent control module. The KGM controls terminal 30g-f across a bistable relay that is firmly soldered on the board of the control module. 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 module. If the fault persists 5 minutes after the reset, terminal 30g-f is switched off.

There are the following three fault cases:

The DME/DDE permanently monitors the state of charge of the battery using the IBS. When the starting capability limit is reached, the IBS wakes the vehicle and the DME/DDE sends a message to reset terminal 30g-f. The KGM receives the message and switches the bistable relay off for 10 seconds.
If the state of charge continues to deteriorate after the reset, the DME/DDE sends a message to cut off terminal 30g-f. The KGM receives the message and switches the bistable relay off after an after-run time of 2 minutes.

As of terminal R off, the KGM monitors whether the vehicle is able to go into the idle state. The vehicle can only enter the idle state when all the control modules are ready for this. If not all control modules have signaled readiness after approx. 60 minutes, the KGM switches terminal 30g-f off for 10 seconds.
If not all control modules have signaled readiness 5 minutes after this reset, the KGM switches terminal 30g-f off after an after-run time of 2 minutes.

A few minutes after terminal R off, the vehicle has normally switched into the idle state. As of the idle state, the KGE counts how often the vehicle is wakened. The KGM switches terminal 30g-f off for 10 seconds when a vehicle has been wakened unexpectedly more than 30 times with terminal R off.
If the vehicle is wakened 5 more times unexpectedly after this reset, the KGM switches terminal 30g-f off after an after-run time of 2 minutes.

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 modules 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)
NB! between model year 09/2006 and 03/2007, SZL electronics at terminal 30.
TCU Telematic control module (as of model year 09/2006, only US version)
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 module supplied by terminal 15:
FLA High beam headlight assistant
For safety reasons, some control modules 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 modules supplied by terminal 87:
VTC Valvetronic

Terminal R:
Terminal R is not present as a hardware terminal.
One control module is directly supplied by the CAS via terminal R:
ACSM Crash Safety Module