Energy diagnosis: Terminal control

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.

BLB0605PIC60613102

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 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
(as of model year 09/2006, except US version)

TLC

Lane departure warning (as of model year 03/2007)

ULF-SBX
ULF-SBX-H

Interface box
Interface box High

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:

  1. 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.
  2. 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 units are ready for this. If not all control units have signalled readiness after approx. 60 minutes, the KGM switches terminal 30g-f off for 10 seconds.
    If not all control units have signalled readiness 5 minutes after this reset, the KGM switches terminal 30g-f off after an after-run time of 2 minutes.
  3. 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 time 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 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)
NB! between model year 09/2006 and 03/2007, SZL electronics at terminal 30.

TCU

Telematic Control Unit
(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 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