MERCEDES-BENZ ML430 1997 Complete Repair Manual

The Audio 30 APS does not have a number pad. For this reason, it is not possible to control the telephone over
the radio (see operating instructions).
On vehicles (as of approx. 07.99) with multifunction steering wheel (telephone control with keys on steering
wheel) this function is then also possible with the Audio 30 APS navigation system.
NOTES ON TRAFFIC PRO NAVIGATION SYSTEM - AH82.61-P-0002-01A
Models 129, 140, 163, 168, 170, 202, 208, 210


Customer information, installation position for GPS antenna
There are two different installation locations for the GSP antenna:
1. Standard GPS antenna from DaimlerChrysler on roof or trunk lid. This version offers the best reception
and is therefore preferable.
2. Use of magnetic antenna in vehicle passenger compartment. This version is part of the kit from the
Becker company and installation is described in Becker installation instructions.
Notes on installation of Becker GPS antenna
The GPS antenna can only be installed horizontally with a maximum deviation of 10° from horizontal.
The GPS antenna should always have an unobstructed view of the sky. Tinted windows can reduce the function
of the GPS antenna considerably.
When installing the GPS antenna always ensure that the arched surface of the antenna points upwards.
NOTES ON FIBER OPTIC CABLE - AH82.70-P-0001-02A
Model 129, 163, 168, 170, 202, 203, 208, 209, 210, 215, 220, 230, 414,
463.243/244/245/246/247/248/249/250/254/270/271/303/309/322/323/332/333/340/341

Illustrated on Model 202 sedan

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Fig. 2: Identifying Fiber Optic Cable Module, CD Player With Changer (In Trunk) And Voice Control
System Control Unit
Position of the identification
For vehicle models 170, 202, 203, 208, 210, 215, 220, 230, 463 an identification plate is located on the fiber
optic cable wiring harness behind the radio on which the fiber optic cable modules (1, 2, 3, 4) specially fitted to
these vehicles are specified together with their exact length.
With models 129, 414 the identification plate is in the trunk next to the CD changer.
With model 168, the identification plate is in the passenger footwell in the area of the control unit box. If there
is no length specification on the identification plate, the respective fiber optic cable module must be removed
and the necessary length measured.
Vehicle model 163 does not have any identification plate.
With repairs, the individual fiber optic cable modules with corresponding length specification can be ordered
(see spare-parts documentation Group 82).

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Fig. 3: Identifying Position Of Identification On Fiber Optic Cable Wiring Harness
Routing
The inserts (5) of the fiber optic cable modules may only be routed as in production. The fiber optic cable
modules must always be pr ovided with a protective cap when routing. For every vehicle model, the sequence of
components in the D2B ring is specifically predetermi ned. The components are connected by fiber optic cable
modules. They are secured to a wiring ha rness with an orange-colored casing.
Fig. 4: Identifying Fiber Optic Cable Modules Insert

Danger of breaking! Do not kink fiber optic cable, route over sharp edges or be nd in radii smaller than 25
mm. Tensile forces on inserts must not exceed 65 N.
The fiber optic cable must not be exposed to temperat ures greater than 85°C or lower than -40°C. Do not
squeeze fiber optic cable, in other words do not compress with clamps or cable ties.
Connection between the devices
The Digital Data Bus ring (D2B) connects the new ra dio generation and COMAND (monitor) to the CD
changer (CDC) (USA preinstallati on), telephone and portable CTEL. The sound amplifier remains wired as
COMAND (monitor) to the CD changer (CDC) (USA preinstallation), telephone and portable CTEL. The sound
amplifier remains wired as befo re with Models 129, 170, 202, 208 and 210. The radio and COMAND as head
unit (HU) performs the master function and also forms the interface to the Control Area Network bus Class B
(interior) (CAN-B) (for vehicles wi th multifunction steering wheel).
Ring sequence of vehi cles/models/interface

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Model 129 HU - telephone (or Tele Aid) - CDC - HU
Model 163 HU - Sound - CDC - telephone (or TELE AID) - HU
Model 168 HU - telephone - CDC - HU
Model 170 HU - telephone - HU (ECE); HU - CDC - HU (Japan)
Model 202/208 HU - CDC - telephone (or Tele Aid) - VCS - HU
Model 203/209 HU - sound - portable CTEL interface - VCS - CDC - HU
Model 210 HU - CDC - VCS - telephone (or TELE AID) - HU
Model 215/220 HU - sound - CDC - telephone (or Tele Aid) - VCS - optional portable CTEL interface - HU
Model 230 HU - Sound - CDC - Telephone (or TELE AID) - SBS - HU
Model 414/463 HU - CDC - telephone - HU
The sequence represents the current maximum equipment. If special equipment (SA) is omitted, the
respective item is deleted, resulting in a new ring sequence.
Read out actual configuration using STAR DIAGNOSIS
As of September 1999 it is possible to read out the current actual configuration of a functioning D2B ring by
means of STAR DIAGNOSIS. This is particularly important in the case of later expansion of the D2B ring and
when retrofitting D2B components e.g. telephone.
In the diagnosis system there is the menu item "Retrofitting D2B components". Under this menu item, the
current actual configuration of a vehicle can be read out and written back immediately as a new nominal
configuration. The process is self-explanatory.
BASIC KNOWLEDGE
DIGITAL DATA BUS (D2B), FUNCTION - GF82.00-P-0001A
MODEL 129 as of 1.6.98, 163, 168 as of 1.9.98, 170, 202 as of 1.6.98, 203, 208, 210 as of 1.6.98, 215, 220
Component sequence, exemplified on model 220 with code (819) 6-disc CD changer, with code (810)
sound system, with code (813) voice control system (VCS) and with code (855) TELE AID

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Fig. 5: Identifying Digital Data Bus (D2B), Function
Digital Data Bus (D2B)
The Digital Data Bus (D2B) is a data transmission system for the communication and information components,
which utilizes the optical data transfer options. Data transfer is conducted by means of optical pulses, which are
transferred over fiber optical cables to the connected communication and information components. Audio and
command signals are converted in the source components into optical pulses and transmitted via fiber optical
cables. The optical signal is converted back to an electronic signal in the target component. Because of the high
transfer rate, the Digital Data Bus (D2B) can transfer audio and command signals simultaneously. Simultaneous
transfer of source data and command data over the Digital Data Bus (D2B) significantly reduces the amount of
cabling. The connected components require 2 lines for the voltage supply (electrical) and 2 lines (input/output)
for the fiber optical cable of the Digital Data Bus (D2B) and one line for the wake-up signal (electrical).
In addition to this the fiber optical cable can transfer several pieces of source data simultaneously (e.g. music
and voice from 2 components), without compromising the data content.
Functional sequence on example of "Play CD" on model 220
Pressing "Play" on the radio (A2) sends a command signal over the Digital Data Bus (D2B) to the CD player
with changer (in trunk) (A2/6), for vehicles with code (819) 6-disc CD changer. The audio signals from the CD
player with changer (in the trunk) (A2/6), for vehicles with code (819) 6-disc CD changer, are then sent over the
Digital Data Bus(D2B) as source data to the Sound amplifier (A2/13), or for vehicles with code (810) to the
sound system. The target components, the Sound amplifier (A2/13), or for vehicles with code (810) the sound
system, the source data are then converted back to electrical signals and reproduced as sound.
Data transfer using fiber optic cables has the following advantages:
Extremely high data transmission rate
Prevents tapping and cross talk
Insensitive to electromagnetic radiation

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Short-circuit resistance
Zero potential connection of components
No oxidation
Low weight of fiber optical cable
Minimum diameter of wiring harness
The digital data bus (D2B) has a closed ring structure. The communication and data components are arranged
here in a distributor line (in-series circuit). This arrangement is type specific and is illustrated by way of an
example on model 220 as follows:
Radio (A2)
CD player with changer (in trunk) (A2/6), with code (819) 6-disc CD changer
Sound amplifier (A2/13), with code (810) Sound System
Voice control system control unit (A35/11), with code (813) voice control system (VCS)
Telephone and TELE AID transmitter/receiver, D2B (A35/17), with code (855) TELE AID
Data transfer is conducted here in one direction only, i.e. the optical pulses for the voice control system control
unit (A35/11), for vehicles with code (813) voice control system (VCS), on model 220 pass through all
components connected to the ring, before arriving at the target components.
When the system is first put into operation, a system test is performed. In doing so the individual components
and their sequence in the ring structure of the Digital Data Bus (D2B) are registered by the component with the
master function.
A type-specific sequence is stored ex-factory. In turn, the storing of a sequence ex-factory means: if the radio
(A2) is taken from one model series and installed into another one, then during a system test the different
sequence of the components and an error message are filed in the diagnostic trouble code memory.
An error message is also filed if the radio (A2) is exchanged within a model series with different equipment
components. The system goes to the operational state regardless of the error message. STAR DIAGNOSIS
enables the sequence of the components to be subsequently altered in the Digital Data Bus (D2B).
The Digital Data Bus (D2B) is diagnosis capable via the data link connector (X11/4), except for models 129
and 202.
The operating principle of the Digital Data Bus (D2B) is the same for all model series; all that changes is the
sequence of components depending on the national version and equipment specification.
TABLE OF CONTENTS, FUNCTION DESCRIPTION OF DIGITAL DATA BUS (D2B) - GF82.00-P-0999ZZ
MODEL 129 as of 1.6.98, 163, 168 as of 1.9.98, 170, 202 as of 1.6.98, 203, 208, 210 as of 1.6.98, 215, 220
Data transfer, function GF82.00-P-2000A

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DATA TRANSFER, FUNCTION - GF82.00-P-2000A
MODEL 129 as of 1.6.98, 163, 168 as of 1.9.98, 170, 202 as of 1.6.98, 203, 208, 210 as of 1.6.98, 215, 220
The Digital Data Bus (D2B) contains the master unit, e.g. the radio (A2) except for model 129, and model 202,
which triggers all the components in the Digital Data Bus system (D2B). The master unit also serves as an
interface (Gateway) to the CAN interior (CAN-B). For this purpose, signals arriving at the master unit are
converted so that they can be transmitted from the Digital Data Bus (D2B) to the CAN interior (CAN B) and
vice versa. Moreover, the master unit serves as a timing circuit which provides the clock pulse with which the
information frames are transferred on the Digital Data Bus (D2B). A frame consists of 2 subframes. A series of
many data frames contains the complete information for proper operation of the components located at the
Digital Data Bus (D2B). The conversion of optical pulses into electrical signals and vice versa is done by
transmitter and receiver diodes, that are integrated into each component. Each of the components receives or
transmits the electrical signals from the chip of the Digital Data Bus system (D2B) as a "D2B log". Source data
and control data are transmitted.
The source data are transferred synchronously, for example as present on a music CD, as 32 bit blocks into the
subframes. By contrast, control data are transferred asynchronously. They are divided up (2 bits per subframe)
and distributed over several subframes. The control data are provided with an address, which indicates for
which components the data are intended in the Digital Data Bus (D2B). The individual data packages are joined
together again in the components and they can then be processed. A data frame can therefore contain highly
differing types of information (source and control data from all components mounted in the digital data bus
(D2B)). The transmission and reception diodes as well as the digital data bus (D2B) chip are switched off when
not required in order to reduce the quiescent current (sleep mode). Switch-off is accomplished immediately
when the master unit or circuit 15 is switched off. After restart, the digital data bus system (D2B) can be
activated either by the components or by the master unit by means of an electrical signal in the wake-up line for
optical data transmission.
Regardless whether the information is intended for a component, it feeds an edited light signal back into the
digital data bus (D2B) at full intensity (repeater function).
WAKE-UP, FUNCTION - GF82.00-P-2001A
MODEL 129 as of 1.6.98, 163, 168 as of 1.9.98, 170, 202 as of 1.6.98, 203, 208, 210 as of 1.6.98, 215, 220
Normal wake-up
Digital data bus (D2B), function GF82.00-P-0001A
Data transfer, function GF82.00-P-2000A
Wake-up, function GF82.00-P-2001A
Survey of system components, digital
data bus (D2B),
location/task/design/function GF82.00-P-9999A
Wake-up, function GF82.00-P-2001A

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Since the transmitting and receiving diodes along with the digital data bus system's (D2B) chip are
automatically shut off if they are not needed (sleep mode), a wake-up pulse, which activates the system, is
required to start a new data transfer. This is accomplished via the separate wake-up line. For this purpose, the
master unit actuates the wake-up signal (electrical signal), which allows the voltage in the wake-up line to
decrease to a defined value. The chip of the digital data bus system (D2B) in the components recognizes on
account of the duration of the signal that this is a wake-up signal, and the digital data bus (D2B) is then
activated. Therefore the digital data bus (D2B) is then in an activated state. A "wake-up" can take place in a
quiescent system (sleep mode) even without the wake-up pulse of the master unit by activation of a component
located at the digital data bus (D2B).
Wake-up diagnosis
For diagnosis of the wake-up circuit in the components, the master unit can trigger a wake-up diagnosis signal
using STAR DIAGNOSIS and the data link connector (X11/4). This signal differs from the wake-up signal by
the fact that it has a significantly longer duration. The components react to this long wake-up pulse with a signal
on the wake-up line (message to master unit). This allows the master unit to recognize which components have
received the long wake-up pulse. The wake-up diagnosis signal can only be actuated when the digital data bus
(D2B) cannot be activated due to an error. If all components reply to the master unit, then their voltage supply is
correct.
FIBER OPTIC CABLE, LOCATION - GF82.00-P-4000-01GH
Model 163
Components for ECE version
Fiber optical cable,
location/task/functionExcept model 208.4GF82.00-P-4000A

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Fig. 6: Identifying Fiber Optic Cable Components Location
FIBER OPTIC CABLE, FUNCTION - GF82.00-P-4000-04A
The fiber optical cable consists of plastic with a fiber diameter of 1 mm. Each fiber optical cable is protected
against mechanical damage and against admission of outside light with the help of an orange-colored insulation.
The light for the data transfer in the digital data bus (D2B) has a wavelength of 650 nm; by comparison, visible
light lies in the range of blue with 400 nm to red with 800 nm. Optical attenuation of the light signal can occur
in the fiber optic cable. Attenuation of the optical signal in the fiber optical cable is dependent on:
the length of the line between the individual components
the bending radii when routing the fiber optical cable, which must have min. bending radius = 25 mm
the condition of the insulation of the fiber optical cable
A passive connector; this is used when a component is removed from the digital data bus (D2B) due to a
fault.
To ensure the functional availability of the remaining components, the digital data bus (D2B) is closed again
using a passive connector. The fiber optical cable has two different connection ends:
The fiber optical cable input, which is the output to each control unit. This is marked in "white".
The fiber optical cable output, which is the input to each control unit. This is marked in "red".
FIBER OPTIC CABLE, LOCATION/TASK/FUNCTION - GF82.00-P-4000A
MODEL 129 as of 1.6.98, 163, 168 as of 1.9.98, 170, 202 as of 1.6.98, 203, 208.3, 210 as of 1.6.98, 215, 220

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Exemplified on model 215 with code (819) 6-disc CD changer, with code (810) Sound System and with
code (382) MB phone "CTEL" in console on right side of dome
Fig. 7: Identifying Fiber Optic Cable, Location/Task/Function

SURVEY OF SYSTEM COMPONENTS, DIGITAL DATA BUS (D2B), LOCATION/ TASK/DESIGN/FUNCTION - GF82.00-P-
9999A
MODEL 129 as of 1.6.98, 163, 168 as of 1.9.98, 170, 202 as of 1.6.98, 203, 208, 210 as of 1.6.98, 215, 220
Fiber optic cable, locationModel 129GF82.00-P-4000-01D
Model 163 as of 01.09.01GF82.00-P-4000-01GH
Model 168GF82.00-P-4000-01E
Model 170GF82.00-P-4000-01C
Model 202, 208GF82.00-P-4000-01B
Model 203GF82.00-P-4000-01G
Model 210GF82.00-P-4000-01A
Models 215, 220GF82.00-P-4000-01F
Fiber optic cable, purposeThe fiber optical cable is
responsible for the optical
data transfer of the
components located at the
digital data bus (D2B).
Fiber optic cable,
function GF82.00-P-4000-04A
Fiber optic cable, Except model 208.4GF82.00-P-4000A

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