Cars • Overall Vehicle C-Class (W204)

Initial Training Information Module

Cars • Overall Vehicle

C-Class (W204)
Initial Training

Information Module

r As at 02/07
This document is intended solely for use in training and is not subject to regular updating.

Printed in Germany Note:

© 2007 Copyright DaimlerChrysler AG The term »employees« does not imply any preference
of gender and incorporated male and refers to maler
Publisher: Global Training and female employees alike.
This document with all its sections is protected under the laws of copyright. Its use for any purpose whatsoever
requires the prior written consent of DaimlerChrysler AG. This applies in particular to its reproduction, distribution,
modification, translation, recording on microfilm or storage and/or processing in electronic systems, including
databases and on-line services.

1511 1902 02 - 1. edition 02/07 80 As at 02/07

08.02.2007
Content 21.02.2007

Title Page

Engine................................................................................................................................................................................................................................................. 1
FG00.10 Engine <> Model Series Overview ........................................................................................................................................................................................ 2
FG07.00 Engine <> M271 Features .................................................................................................................................................................................................... 3
FG07.00 Engine <> M272 Features .................................................................................................................................................................................................... 4
FG07.00 Engine <> OM646 EVO Features .......................................................................................................................................................................................... 5
FG07.00 Engine <> OM642 Features.................................................................................................................................................................................................. 6
FG47.00 Engine <> General Information on the Fuel System ............................................................................................................................................................. 7
FG47.00 Engine <> Fuel Pump Actuation ........................................................................................................................................................................................... 8
FG47.20 Engine <> Fuel Feed Module ................................................................................................................................................................................................ 9
FG00.20 Engine <> General Information on the Maintenance System.............................................................................................................................................. 10
Body and Safety................................................................................................................................................................................................................................ 12
FG60.00 Body and Safety <> Bodyshell Structure ............................................................................................................................................................................ 13
FG98.00 Body and Safety <> Corrosion Prevention Concept............................................................................................................................................................ 15
FG72.00 Body and Safety <> Door Concept ..................................................................................................................................................................................... 17
FG91.00 Body and Safety <> ARAMIS Restraint Systems................................................................................................................................................................. 18
FG91.00 Body and Safety <> Front Emergency Tensioning Retractors ............................................................................................................................................. 21
FG91.00 Body and Safety <> PRE-SAFE/Reversible Emergency Tensioning Retractors ................................................................................................................... 22
FG91.00 Body and Safety <> Restraint Systems / Crash-Active Emergency Lighting ...................................................................................................................... 23

02/07 Cars • Overall Vehicle C-Class (W204) Initial Training Information Module
Content I 1
FG77.00 Body and Safety <> Roof Systems ..................................................................................................................................................................................... 24
Body and Safety <> Emergency Operations ...................................................................................................................................................................................... 29
Body and Safety <> Accessories: Duo Plus Child Seat...................................................................................................................................................................... 33
Electrical System .............................................................................................................................................................................................................................. 36
FG00.19 Electrical System <> Networking ....................................................................................................................................................................................... 37
FG54.21 Electrical System <> Signal Acquisition and Actuation Module (SAM) ............................................................................................................................... 39
FG54.15 Electrical System <> Fuses ................................................................................................................................................................................................ 42
FG54.10 Electrical System <> On-Board Electrical System Management ......................................................................................................................................... 44
FG82.10 Electrical System <> Illumination ....................................................................................................................................................................................... 46
FG82.35 Electrical System <> Windshield Wiper System.................................................................................................................................................................. 48
FG83.00 Electrical System <> Climate Control................................................................................................................................................................................. 49
Chassis ............................................................................................................................................................................................................................................. 52
FG31.00 Chassis <> Trailer Hitch (SA Code 550) ............................................................................................................................................................................. 53
FG32.00 Chassis <> Chassis Versions.............................................................................................................................................................................................. 55
FG33.00 Chassis <> Front Axle ........................................................................................................................................................................................................ 56
FG35.00 Chassis <> Rear Axle.......................................................................................................................................................................................................... 57
FG42.00 Chassis <> Brake System................................................................................................................................................................................................... 58
FG46.00 Chassis <> Steering ........................................................................................................................................................................................................... 60
Telematics ........................................................................................................................................................................................................................................ 62
FG82.55 Telematics <> Audio/Navigation Systems ......................................................................................................................................................................... 63
FG82.85 Telematics <> Overview of the New COMAND Functions................................................................................................................................................... 66
FG82.70 Telematics <> Telephone ................................................................................................................................................................................................... 67

02/07 Cars • Overall Vehicle C-Class (W204) Initial Training Information Module
Content I 2
FG82.70 Telematics <> Function Overview of Basic/Comfort Telephony......................................................................................................................................... 69
FG82.70 Telematics <> Voice Control System (VCS)........................................................................................................................................................................ 70
FG82.62 Telematics <> Antennas ..................................................................................................................................................................................................... 71

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Content I 3
02/07 Cars • Overall Vehicle C-Class (W204) Initial Training Information Module
Content I 4
Engine 21.02.2007

Learning objectives

Overall vehicle – comparison of technical data

• You can name the engine versions at the market
launch.
• You can name the subsequent engine versions after
the market launch.
General information on the maintenance system
• You can explain and demonstrate how to read out
the workshop code.
• You can state the meaning of the workshop code that
is read out.
Design and task of the fuel system
• You are familiar with the design and function of the
fuel system.
• You can understand the functioning of the fuel
pressure control.
• You will know how to use the special tool when
removing/installing the fuel feed module.
• You know the option of replacing the fuel level
sensors individually.
P47.00-2147-50

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Engine 1
FG00.10 Engine <> Model Series Overview 21.02.2007

At market launch of the new C-Class in March 2007

the following model variants will be available:

C 200 M271(KE18ML)

C 230 M272(KE25)

C 280 M272(KE30)

C 350 M272(KE35)

C 220 CDI OM646(DE22LA EVO)

In the course of 2007, the model range will be

expanded by the following variants:
C 320 CDI OM642(D30LA)

C 180 M271(KE18ML)

C 200 CDI OM646(DE22LA EVO)

GT00_00_0529_C81

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FG00.10 Engine <> Model Series Overview 2

FG07.00 Engine <> M271 Features 21.02.2007

Technical features:
• 4-cylinder in-line engine
• Aluminum crankcase with cast iron cylinder barrels
• 4-valve technology with 2 camshafts
• Lanchester balancer (to compensate for free inertial forces)
• Continuously variable camshaft adjustment of the intake/exhaust
camshafts
• Internal exhaust gas recirculation (via the camshaft adjustment)
• 2 crankcase ventilation systems (partial & full load)
• Engine control unit mounted on the engine
• Engine control unit with CAN gateway function
• SIM 4 LKE gasoline injection and ignition system (Siemens)
• Fuel system with fuel pump control unit (N118)
• Compressor charging via an EATON charger
• Charge air cooling
• Dedicated ignition coils
• Catalytic converters mounted close to the engine
• Linear lambda control (wide-band sensor)
• Exhaust certification in accordance with EURO 4 P01-00-2294-01
• Vacuum pump
Sales Displacement Rated output Rated torque
designation in cm³ kW (HP) Nm (Ib-ft)
C180 1796 115 230 Nm
(204.040) kW (156 HP) (169 Ib-ft)
C200 1796 135 250 Nm
(204.041) kW (183 HP) (184 Ib-ft)

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FG07.00 Engine <> M271 Features 3

FG07.00 Engine <> M272 Features 21.02.2007

Technical features:
• V6 engines with 60° cylinder angle
• Aluminum crankcase with silicon-coated barrels (SILITEC)
• 4-valve technology with two camshafts per cylinder bank
• Balance shaft (to compensate for free inertial forces)
• Weight-reduced pistons and rods
• Infinite camshaft adjustment of the intake/exhaust camshafts of up to
40° CA
• Internal exhaust gas recirculation (via the camshaft adjustment)
• 2 crankcase ventilation systems (partial & full load)
• Engine control unit mounted on the engine
• Engine control unit with CAN gateway function
• ME9.7 gasoline injection and ignition system (Bosch)
• Fuel system with fuel pump control unit (N118)
• Variable intake manifold with variable length intake manifold switchover
flaps and swirl flaps
• HFM 6 hot film mass air flow sensor (frequency output)
• Dedicated ignition coils
• Catalytic converters mounted close to the engine P01-00-2479-50

• Linear lambda control (wide-band sensor) Sales Displacement Rated output Rated torque Nm
• Engine thermal management with electrical three-disk thermostat designation in cm³ kW (HP) (Ib-ft)
• Exhaust certification in accordance with EURO 4 C230 2496 150 245 Nm
(204.052) kW (203 HP) (180 Ib-ft)
C280/C300 2996 170 300 Nm
USA (204.054) kW (231 HP) (221 Ib-ft)
C350 3488 200 350 Nm
(204.056) kW (271 HP) (258 Ib-ft)

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FG07.00 Engine <> M272 Features 4

FG07.00 Engine <> OM646 EVO Features 21.02.2007

Technical features:
• 4-cylinder in-line engine
• Cast iron crankcase
• 4-valve technology with two camshafts
• Lanchester balancer (to compensate for free inertial forces)
• Crankcase ventilation system with electrical heating element
• Engine control unit with CAN gateway function
• CDI-D common rail diesel injection (Delphi)
• Max. injection pressure 1600 bar
• Magnet fuel injectors
• Maximum peak pressure in the combustion chamber up to 165 bar
• VTG turbocharger with electrical actuator motor (variable turbine
geometry) stage 3
• Charge air cooling
• Intake air throttling via the throttle valve actuator (only diesel particulate
filter)
• Intake port shutoff (EKAS) with electrical actuator motor P01-10-2775-50
• Exhaust gas recirculation with electrical actuator motor Sales Displacement Rated output Rated torque Nm
• Diesel particulate filter designation in cm³ kW (HP) (Ib-ft)
• Instant Start System
• Glow plugs with ceramic glow pins C200 CDI 2148 100 300 Nm
(204.007) kW (135 HP) (221 Ib-ft)
• Knock sensor
• Oil level switch and oil temperature sensor C220 CDI 2148 125 400 Nm
• Certification in accordance with EURO 4 (204.008) kW (169 HP) (295 Ib-ft)

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FG07.00 Engine <> OM646 EVO Features 5

FG07.00 Engine <> OM642 Features 21.02.2007

Technical features:
• V6 engine with 72° cylinder angle
• Aluminum crankcase with cast iron cylinder barrels
• 4-valve technology with two camshafts per cylinder bank
• Balance shaft (to compensate for free inertial forces)
• Crankcase ventilation with centrifugal oil separator
• Engine control unit with CAN gateway function
• CDI 6 common rail direct injection (Bosch)
• Max. injection pressure 1600 bar
• Piezo fuel injectors
• Maximum peak pressure in the combustion chamber up to 175 bar
• VTG turbocharger with electrical actuator motor (variable turbine
geometry) stage 2
• Charge air cooling
• Intake air throttling via the throttle valve actuator (exhaust gas
recirculation & diesel particulate filter regeneration)
• Intake port shutoff (EKAS) with electrical actuator motor
• Exhaust gas recirculation with electrical actuator motor
• Diesel particulate filter
• Instant Start System
P01-10-2564-50
• Oil level switch and oil temperature sensor
• Certification in accordance with EURO 4 Sales Displacement Rated output Rated torque Nm
designation in cm³ kW (HP) (Ib-ft)
C320 CDI 2987 165 510 Nm
(204.022) kW (224 HP) (376 Ib-ft)

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FG07.00 Engine <> OM642 Features 6

FG47.00 Engine <> General Information on the Fuel System 21.02.2007

Every engine variant in BR204 (ECE) has a plastic

tank with a coupled design.
The filling volume for all variants is 65 l including
an 8 l reserve.
The fuel feed module is located on the right side
with an installed MAPPS fuel level sensor.
The left side holds the fuel filter. A fuel level
sensor is also installed on the filter.
A suction jet pump is installed in each of the tank
halves to equalize their fill levels.
Both of the components in the tank (fuel filter,
fuel feed module) are accessed for servicing via
openings in the vehicle floor below the rear bench
seat.

In BR204, a differentiation is made between two

kinds of electrical fuel pump actuation:

Diesel engines: uncontrolled fuel supply

Gasoline engines: electronically controlled fuel

supply

P47.00-2147-50

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FG47.00 Engine <> General Information on the Fuel System 7

FG47.00 Engine <> Fuel Pump Actuation 21.02.2007

The vehicles with gasoline engines M271 and M272 will be

equipped with a newly developed, electronically controlled fuel
supply. The main difference is that the fuel quantity is
controlled according to the actual fuel requirements of the
engine and, as a result, the idle power of the electric fuel pump
has been significantly reduced.

This control unit consists of a control and power electronics

unit.
The fuel pump control unit is connected to the fuel pump, fuel
pressure sensor, and the ME engine control unit via the two
connectors.

Advantages of this system include: GT07_61_0083_C75

• Significantly less power consumption by the electric fuel
pump and, as a result, less load on the on-board electrical
system
• Lower rotational speed of the electric fuel pump, which
means that the noise emissions are significantly reduced.

The fuel pump control unit has diagnostic capability and can be
read out using STAR DIAGNOSIS.

Information for Service

FSCU Fuel System Control Unit

02/07 Cars • Overall Vehicle C-Class (W204) Initial Training Information Module 00_In_LT18_1511_1901_V01_PCEA_31.01.07

FG47.00 Engine <> Fuel Pump Actuation 8

FG47.20 Engine <> Fuel Feed Module 21.02.2007

New lock rings have been introduced to attach the fuel feed modules in the
fuel tank in model series 204.

After a fuel feed module has been detached, the gasket between the fuel
feed module and the fuel tank must always be replaced for safety reasons.

When attaching the lock rings, they must be turned clockwise with force
using the special tool (claw wrench).

Legend
The lock ring is locked when the catch tabs latch between the recesses on 1 Fuel feed module
the locking claws.
GT47_20-0029-C11

A lock ring that is not latched in correctly may become loose, which may
result in leaks in the fuel tank!

Information for Service

The fuel feed modules can only be detached and attached using a special
tool (W 001 589 00 07 00).

For additional information see AR 47.10-P-4100-02 CWA

W001-589-00-07-00

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FG47.20 Engine <> Fuel Feed Module 9

FG00.20 Engine <> General Information on the Maintenance System 21.02.2007

The well-known "ASSYST plus" maintenance system is used in BR204.

This maintenance system includes fixed service intervals.

• Gasoline engines: 25000 km or 1 year (if using 229.5 oil)
• Diesel engines: 25000 km or 1 year (if using 229.31 oil)

An additional highlight is integration in:

• Service Packet Pricing System (SPPS)

This provides the customer with a high level of transparency as regards:

• Maintenance costs
• Scope
• Workshop appointments
with maximum flexibility.
GT00_20_0023_C71

Go to the following Internet address to find out more on the Service Packet
Pricing System (SPPS):
https//aftersales-net.daimlerchrysler.com/portal

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FG00.20 Engine <> General Information on the Maintenance System 10

• The fixed service interval is coded within the CGW.
• Code K12 indicates a programmed, fixed service interval.
• Additional K__coding enables programming of further service intervals.

Note: This screen appears in DAS:

1. In ASSYST PLUS
2. In the CGW in the Control unit adaptation menu item

Also note: Service Information: SI00.20-P-0027A

Illustrated on BR219 (code K12 does not exist for BR204)

Possible service intervals and associated codes in BR204.

These are programmed via SCN coding when the vehicles leave the factory, GT47_20_0030_C11
taking specific national versions into account.
Code for service intervals Service intervals

K13 25,000 km

K14 20,000 km

K15 15,000 km

K16 12,000 km

K17 10,000 km

K18 8,000 km

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FG00.20 Engine <> General Information on the Maintenance System 11

Body and Safety 21.02.2007

Learning objectives
• You will know the vehicle shell structure and the
materials used for it.
• You can list differences with respect to the W203
vehicle shell and will know the special features.
• You can identify the corrosion prevention system
and deduce advantages.
• You can describe the detailed structure of the door
concept.
• You will know the structure, the function and the
special features of ARAMIS/NECK-PRO and PRE-
SAFE.
• You can perform all emergency operations for
doors, sliding roof, tank cap and park pawl.
• You can find and use Isofix mountings.
• You can define different roof systems and name
new features.

P91.00-2200-50

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Body and Safety 12

FG60.00 Body and Safety <> Bodyshell Structure 21.02.2007

Low carbon steels

High-strength steels
Modern high-strength steels
Super high strength steel
Hot-formed super high-strength steels (e.g. USIBOR)

Aluminum
Plastic

P60.00-2770-00

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FG60.00 Body and Safety <> Bodyshell Structure 13

Passenger cell
The highly stable passenger cell, designed as a safety cage, forms the core of
the body safety concept. Contributing, above all, to its high stability under
accidental stresses (head-on, side and rear collisions, as well as rollovers) are:
• Increased use of high-strength, modern high-strength, super high-
strength, and hot-formed super high-strength sheet steel and sheet metal
with stepped wall thicknesses.
• Materials and sheet thicknesses appropriate for the stresses to the
components or structure zones that are severely strained during
accidents. GT63_10_0016_C74
• An optimized forming and cross-section design. Legend

1 Y markings (separation points) for the body

Marking of sectional repairs 2 Bonding of rear fender

"Y" markings are included on the C-pillar paneling and on the outer side of the
longitudinal member (below the paneling), which mark the recommended
separation points. Joining up the "Y" markings produces an outline for the cut Note
and join.
Permissible repair methods are described in the Workshop Information
Bonding of the rear fender to the wheel well with soft adhesive is a new System (WIS).
feature. An appropriate repair method is described for this in WIS. In general, all areas that are bonded as standard must also be bonded during
repairs.
In the case of a repair, the roof paneling is riveted on the left and right in the
roof duct instead of being spot welded as in series production.

Note
For reasons of crash safety and durability, the use of two-component repair
structural adhesive is absolutely essential.
As a general rule, ultra high-strength hot-formed steel must never be MAG-
welded.

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FG60.00 Body and Safety <> Bodyshell Structure 14

FG98.00 Body and Safety <> Corrosion Prevention Concept 21.02.2007

Fully galvanized body

Body structure fully galvanized:
• Hot-dip galvanizing (in parts)
• Electrolytic galvanizing

General safety precautions prior to mechanical

stress by:
• Underbody paneling
• Wheel house paneling
• Rear floor paneling
• Plastic spare tire well

P61.00-2053-50

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FG98.00 Body and Safety <> Corrosion Prevention Concept 15

Improvement in corrosion protection compared to model series W 203

Body Notes
• Fully galvanized body (even as of model refinement package 203)
• New door frame system with dry area and continuous peripheral seal
• Door bottom edges folded-over with seam seal and wax in the cavities
• Handle strip on trunk lid with centering and chafe protection
• Door handle recess on trunk lid with chafe protection
• Sliding roof frame made of aluminum with plastic water drains
• Continuous peripheral seam seal at all critical points

Major assemblies
• Brake calipers with zinc/nickel coating
• New painting system for the rear axle with subsequent preservation
aftertreatment
• Diagonal struts hot-dip galvanized
• Front axle frame-type integral support hot-dip galvanized after assembly
• Aluminum struts at underfloor
• Rear axle wheel carrier from aluminum
• Front axle springs with limit stops lined with rubber
• Rear axle springs with zinc shims
• Transmission oil lines with zinc/nickel coating

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FG98.00 Body and Safety <> Corrosion Prevention Concept 16

FG72.00 Body and Safety <> Door Concept 21.02.2007

Standard hinge halves Replacement part hinge halves

Note: In the event of complaints can only be adjusted from inside after • Is also installed when a door is replaced
removing various panels. • Permits the doors to be adjusted in the X-direction even from the outside
by means of excenter bolts.

Upper left door

Standard hinge (excenter
upper left hinge, on door)
door hinge

Simple
bolt

Excenter bolt

GT72_00_0027_C82 GT72_00_0024_C72 GT72_00_0028_C82 GT72_00_0025_C72

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FG72.00 Body and Safety <> Door Concept 17

FG91.00 Body and Safety <> ARAMIS Restraint Systems 21.02.2007

Location of airbags
2-stage driver airbag Driver kneebag (ECE + Japan)
Windowbag with
centrally located gas
generator

2-stage front
passenger airbag
Front sidebag
integrated into seat
Rear sidebag
integrated into seat
(SE)
ARAMIS = Triggering device for restraint
equipment actuator system
with integrated sensor bus
P91.00-2200-50

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FG91.00 Body and Safety <> ARAMIS Restraint Systems 18

ARAMIS restraint system control unit
The ARAMIS control unit is used in the W204. ARAMIS is a new development Belt status indication for rear seat belts
that can also allow for future safety-related developments. Depending on the
Vehicles with multifunction steering wheel (4-buttons)
severity of the accident, among other things, it controls the triggering of driver
and front passenger airbag, sidebags and windowbags, emergency tensioning • in rear no belt buckled
retractors and NECK-PRO. • in rear 1 belt buckled
One belt buckle switch each acquires the belt buckled/not buckled status. A
• in rear 2/3 belts buckled
visual/acoustic seat belt reminder warning is integrated for the front seats for
this purpose (Euro-NCAP countries only).
Vehicles with comfort multifunction steering wheel* (12-buttons)
ARAMIS supports the following functions after an accident, depending on the • in rear no belt buckled
severity of the accident: • in rear 1 belt buckled
• Activation of the pyrofuse (via ignition circuit) • in rear 2/3 belts buckled
• Door unlocking (in the event of a CAN interruption via front SAM crash
sensor) You will see the rear seat belt status indication in the multifunction display for
• Window lowering by 50 mm around 30 seconds when you set off, as of a ground speed of around 9 km/h
• Activation of the crash-active head restraints in the event of a rear end or for around 30 seconds if the rear passengers remove or fasten their seat
collision belts.
• Digital crash output via chassis CAN *Special equipment
• Activation of TeleAid (USA)
• Activates hazard warning system Notes
• Engine shutoff via analog crash signal
• Switches on crash-active emergency lighting

Information for Service

The supplemental restraint system control unit (N2/10) has integrated
sensors. It must not be removed if the power supply is still active – airbags
and emergency tensioning retractors will deploy.

Working on or with the control unit is only permitted while the battery is
disconnected and after a waiting time of at least t = 3 s.

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FG91.00 Body and Safety <> ARAMIS Restraint Systems 19

ARAMIS sensor location

Pressure Sidebag Pressure

sensor sensor sensor

Up-Front-Sensor

Up-Front-Sensor

Pressure Sidebag Pressure

sensor sensor sensor
GT91_00_0040_C08
Legend
Optionally installed sensors (for rear sidebags) F32 Prefuse box
Analog crash signal N2/10 ARAMIS
Ignition circuit for pyrofuse N3/10 Engine control unit
Sensors installed as standard N10/1 Front SAM

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FG91.00 Body and Safety <> ARAMIS Restraint Systems 20

FG91.00 Body and Safety <> Front Emergency Tensioning Retractors 21.02.2007

Restraint/emergency tensioning retractor system

GT91_00_0038_C72 GT91_00_0039_C72

The emergency tensioning retractor in the W204 is a new design of toothed An integrated, mechanically operating belt force limiter is responsible for
rack retractor tensioner. The functioning principle is based on the fact that an generating belt forces which are initially slightly elevated but which then
integrated toothed rack, which is fired pyrotechnically, unwinds via a diminish as soon as the airbag has been fully inflated.
cogwheel connected to the seat belt retractor and thus initiates the belt
tensioning.

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FG91.00 Body and Safety <> Front Emergency Tensioning Retractors 21

FG91.00 Body and Safety <> PRE-SAFE/Reversible Emergency Tensioning Retractors 21.02.2007

Reversible emergency tensioning retractors for PRE-SAFE (SA)

Control unit Electric motor

The reversible emergency tensioning retractor is
an independent control unit with CAN connection
(chassis CAN) (provided on both front left and
front right).

Pyrotechnical
Properties of PRE-SAFE: recirculating ball
tensioner
• Activates front reversible emergency
tensioning retractors.
• Closes sliding/panoramic sunroof until a gap
of 50 mm remains (in the event of lateral
acceleration).
• Closes side windows, if open, until a gap of 50
mm remains (in the event of lateral Seat belt
acceleration). retractor
• Moves the front passenger seat into the
optimum position for a crash.

GT91_00_0037_C11

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FG91.00 Body and Safety <> PRE-SAFE/Reversible Emergency Tensioning Retractors 22

FG91.00 Body and Safety <> Restraint Systems / Crash-Active Emergency Lighting 21.02.2007

Crash-active emergency lighting

In the event of a crash in which at least one pyrotechnical restraint system is Output signals
deployed, sections of the interior illumination will be switched on: After the time delay has elapsed (interior light module in front SAM), the front
SAM transmits the signal to the OCP [DBE] to activate the front and rear
• Front and rear interior lights (after a delay of 11 s)
interior illumination and to the door control units (DCUs [TSGs]) to activate
• Front and rear door handle recess lights (after a delay of 11 s) the door handle recess illumination. In vehicles without door handle recess
• Footwell lamps illumination, the transmission of this signal has no function. In vehicles with
Triggering of emergency lighting: non-networked OCP [DBE] the interior lights remain off if the "door contact
Front fuse and actuation module (SAM-F) by a signal to the overhead control switch" is switched off (light switch in OCP [DBE]).
panel (OCP [DBE]) and the door control units (DCUs [TSGs]). Deactivation of emergency lighting
Activation by: • By operating the hazard warning flasher button
Either by the airbag control unit via chassis CAN, or by the integrated crash • By globally unlocking the vehicle using the ignition key
sensor in the front SAM, if the CAN connection to the airbag control unit has • With a circuit change from circuit 15R to circuit 15 (driving off again)
failed. The interior lights can additionally be switched off manually and, if necessary,
switched back on again via the door contact switch (light switch in OCP
Function of front SAM [DBE]).
Delayed triggering of the interior illumination functions on receiving the crash
signal or the alternative crash signal (whichever is received first) by the Note
ARAMIS control unit or by the crash sensor in front SAM. In vehicles with non-networked overhead control panel, the interior lights
Time delay remain off if the interior light switch is manually set to "OFF". Consequently, if
The preconditions are a time delay after the crash of 11 s AND "vehicle the emergency lighting is activated only the handle recess lights and the
stationary". (Reason: Avoids dazzling if vehicle is still moving, does not affect footwell lights are actuated.
door emergency unlocking (delayed by 10 seconds).

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FG91.00 Body and Safety <> Restraint Systems / Crash-Active Emergency Lighting 23
FG77.00 Body and Safety <> Roof Systems 21.02.2007

GT77_00_0035_C79

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FG77.00 Body and Safety <> Roof Systems 24

Glass tilting/sliding roof (SA)

Glass cover

Frame end pieces

Water channel gasket

Rear frame section

Tilting bracket
Bellows
Drive cable

Slider
Guide rail
Wind deflector

Sliding roof lining

Front frame
Electric motor section Vent grille
GT77_00_0037_C09

02/07 Cars • Overall Vehicle C-Class (W204) Initial Training Information Module 00_In_LT20_1511_1901_V01_PCEA_02.02.07

FG77.00 Body and Safety <> Roof Systems 25

Glass tilting/sliding roof (SA)

• Supplied by Webasto
• New frame system resulting from change in
material (corrosion protection)
• Plastic water drains (corrosion protection)
• Anti-pinch protection as in past

Information for Service

Normalization via overhead control switch:
• Open roof in slide position.
• Press and hold overhead control switch in tilt
position until roof is in tilt position.

GT77_00_0036_C79

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FG77.00 Body and Safety <> Roof Systems 26

Top sliding roof (SA)

• New roof design

• New supplier (Inalfa)
• With anti-pinch protection for the first time
• With convenience closing and opening for the
first time
• Non-networked overhead control panel
• Newly developed wind deflector
• Normalization via STAR DIAGNOSIS

GT77_00_0033_C76

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FG77.00 Body and Safety <> Roof Systems 27

Top sliding roof (SA)

Wind deflector

Separate

GT77_00_0034_C76

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FG77.00 Body and Safety <> Roof Systems 28

Body and Safety <> Emergency Operations 21.02.2007

Opening and closing in the case of an emergency

Unlock driver door
Release and remove the emergency key
Pull the release slide c in the direction of the arrow and fully pull the
emergency key d out of the key at the same time.

Legend
c Release slide
d Emergency key

Insert the emergency key up to the stop in the lock and turn counterclockwise
to position c.
The locking pin moves up and the door is unlocked.

Legend
c Unlock
d Lock
Lock vehicle
If your vehicle can no longer be centrally locked with the key:
• Close the front passenger door, rear doors, and trunk.
• Press the central locking switch.
• Check if the locking pins are still visible on all doors. If necessary, press down the locking pins in the
front passenger door and rear doors by hand.
• Lock the vehicle from outside at the driver door using the emergency key. Turn key to position d. The
locking pin on the driver door will move down. The door is locked.
• Check that all doors and the trunk are locked.

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Body and Safety <> Emergency Operations 29

Open luggage compartment
Use the emergency key if the trunk can no longer be unlocked with the key or
KEYLESS-GO.

Note:
The anti-theft alarm signal is triggered if you unlock the trunk with the
emergency key.

There are several options to stop the alarm:

• Press the button or on the key or
• Insert the key in the ignition lock or
• Press the KEYLESS-GO button Legend
• Turn the emergency key up to the stop on the left to position d. Trunk lock
The trunk will automatically open. c Basic position
• Turn the emergency key back to position c and remove it. d Unlock trunk

Fuel filler flap emergency unlocking

• Open the fuse box in the trunk.
• Pull the release cable c.
• Open the fuel filler flap.

Legend
c Release cable

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Body and Safety <> Emergency Operations 30

Manually operating the tilting/sliding roof or panoramic tilting/sliding roof
The drive is located above the overhead control panel.
• Pull the mirror base cover c down as far as possible and turn it to the
side.

Legend
c Mirror base cover
• Insert a thin plastic plate c in the rear end of the overhead control panel
d in the center of the gap between the headliner and overhead control
panel.
• Fold down the overhead control panel d. The connectors do not have to
be disconnected.
• Ensure that the key is removed from the ignition switch.
Legend
c Plastic plate
d Overhead control unit
• Remove the crank c from the owner's manual folder.
• Insert the crank c in the motor drive.
• Move the tilting/sliding roof by turning the crank in the appropriate
direction.
Note:
Only rotate the crank c slowly and without any jerking.

• Remove the crank.

• Replace and clip in the overhead control panel. Legend
• Clip in the mirror base cover again. c Crank

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Body and Safety <> Emergency Operations 31

Manually releasing the park pawl (vehicles with automatic transmissions)
In the case of an electrical malfunction, the selector lever can be manually
released from the P position, e.g. if the vehicle is to be towed.

• Firmly push down on the parking brake.

• Press the selector lever cover c to the left and pull out from above.
• Press the release d down and move the selector lever from the P
position at the same time. Legend
• The selector lever can now be moved freely until it is again brought to "P"
position. c Selector lever cover
d Release

Resetting triggered NECK-PRO head restraints

If the NECK-PRO head restraints were triggered during an accident, you have
to reset the head restraints for the driver and front passenger seats.
Otherwise, this additional protection will not be available during a later rear
end collision. Triggered head restraints can be recognized by the fact that
they are moved forward and can no longer be adjusted.

• Press the lower head restraint padding to the rear up to the stop c. Legend
• Press the head restraint padding down to the stop in the guide e. c Fold back
• Firmly press the top of the head restraint padding until it folds back and d Press back
engages d. e Press down

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Body and Safety <> Emergency Operations 32

Body and Safety <> Accessories: Duo Plus Child Seat 21.02.2007

BABY SAFE plus DUO plus KID

0+ I II, III
ECE age group 0 – 13 kg 9 – 18 kg 15 – 36 kg
(approx. 0 - 15 months) (approx. 8 months – 4 years) (approx. 3.5 – 12 years)

Assembly Rearward-facing Forward-facing Forward-facing

ACSR yes OPTIONAL OPTIONAL

ISOFIX no yes no

Baby Safe plus, ECE (ACSR) DUO plus, ECE (ACSR) KID, ECE (ACSR)
Product variants Baby Safe plus, USA DUO plus, ECE (without ACSR) KID, ECE (without ACSR)
DUO plus, USA (ACSR) KID, USA (ACSR)

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Body and Safety <> Accessories: Duo Plus Child Seat 33

"DUO plus" child seat

Product description

• Suitable for age group I, weight 9 to 18 kg Standard

equipment with Shoulder belt can
Age: from approx. 8 months to approx. 4 years TopTether be adjusted to 7
• Exclusive DC cover in the elegant "DaimlerSquare" pattern: heights
removable, washable, breathable
• Optional ACSR (automatic airbag shutoff) for use on the front passenger
seat with airbag and vehicles with ACSR (code U18)
• Standard equipment with TopTether (additional belt for fixing the head
section) Bracket for
• Standard equipment with ISOFIX anchoring; side stowage
alternative, but can always be used with a 3-point seat belt of the
ISOFIX advantages: shoulder belt
- Standardized fastening for simple, correct installation and removal
- Secure, fixed connection between the child seat and vehicle
- Unoccupied child seats are also fixed in the vehicle
- Optimum protection during an accident
• Sitting, rest, and sleeping positions can be adjusted with a single
movement
• Shoulder belt can be easily adjusted to 7 heights – with central belt
length adjustment
• Bracket for side stowage of the shoulder belt Standard equipment
• Replacement cover (pattern: "DaimlerSquare") available separately with ISOFIX anchoring

Sitting, rest, and sleeping

positions can be adjusted with a
single movement

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Body and Safety <> Accessories: Duo Plus Child Seat 34

Passenger safety

Top tether
TopTether enables an additional connection between the child restraint
equipment fastened with ISOFIX and the rear seat. Injury risks are thus
reduced even further. Both TopTether anchors are located in the rear on the
rear shelf, behind the outer head restraints.

Legend
c Head restraint
d Cover
g TopTether anchor

• Push the head restraint c up.

• Guide the TopTether belt e under the head restraint c between the two
head restraint rods.
• Fold the cover d of the TopTether anchor e up.
• Insert the TopTether hook f in the TopTether anchor g.
• Fold the cover d of the TopTether anchor g down. Legend
• If necessary, push the head restraint c down a bit. Pay attention that the e TopTether belt in the
TopTether belt e is not hindered. ISOFIX child restraint
• Install the ISOFIX child restraint equipment with TopTether. The assembly equipment
instructions from the manufacturer must be followed without fail. f TopTether hooks
g Tether anchor

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Body and Safety <> Accessories: Duo Plus Child Seat 35

Electrical System 21.02.2007

Learning objectives

• You can describe the basic structure of

networking in BR204.
• You can describe the structure of the on-
board electrical system in BR204.
• You know the different installation locations
for fuse boxes.
• You know the different installation locations
for prefuse boxes.
• You will know the installation locations and
most important functions of the two SAMs.
• You know the procedure for exchanging the
bulbs in all lamp units.
• You can explain and demonstrate how to
operate and handle both climate control
versions in a manner that is appropriate for
customers.
• You can describe the basic function of the
wiper system.
• You know both variants of the instrument
cluster.
P00.19-3815-00

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Electrical System 36
FG00.19 Electrical System <> Networking 21.02.2007

The networking structure in model series 204 is

similar to that in model series 221.
The following CAN bus systems are installed:

Chassis CAN 500 kbps

Diagnostic CAN 500 kbps
Front end CAN 500 kbps
Vehicle dynamics CAN 500 kbps
Drive train CAN 500 kbps
Interior CAN 125 kbps
Telematics CAN 125 kbps

GT00_19_0184_C79

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FG00.19 Electrical System <> Networking 37

Legend

A1 Instrument cluster N69/1 Left front door control unit

A40/3 COMAND control unit N69/2 Right front door control unit
A40/8 Audio/COMAND display N69/3 Left rear door control unit
A40/9 Audio/COMAND controller N69/4 Right rear door control unit
A76 Front left reversible emergency tensioning retractor N69/5 Keyless Go control unit
A76/1 Front right reversible seat belt tensioner N70 Overhead control panel control unit
A98 Panoramic sliding roof control module N73 Electronic ignition lock control unit
N80 Steering column module control unit
B24/15 Rotational speed, lateral and N87/3 Digital Audio Broadcasting control unit
longitudinal acceleration sensor N87/5 Satellite digital audio radio control unit
N88 Tire pressure monitor control unit
E1n1 Left xenon light control unit N110 Weight sensing system control unit
E2n1 Right xenon light control unit N118 Fuel pump control unit (M271/M272)
N123/4 Emergency call system control unit
G2 Alternator
X30/21 Drive train CAN potential distributor
N2/10 Supplemental restraint system control unit X30/30 Chassis CAN potential distributor
N3/__ ME-SFI [ME] or CDI control unit X30/32 Left interior CAN potential distributor
N10/1 Front SAM X30/33 Right interior CAN potential distributor
N10/2 Rear SAM X30/35 Telematics CAN potential distributor
N14/3 Glow output stage X35/1 Left front door electrical connector
N15/3 Electronic transmission control control unit X35/2 Right front door electrical connector
N15/5 Electronic selector lever module control unit X35/3 Left rear door electrical connector
N22/7 Automatic air conditioning control and operating unit X35/4 Right rear door electrical connector
N32/1 Driver seat control unit
N32/2 Front passenger seat control unit Y3/8n4 Fully integrated transmission control control unit
N40/3 Sound system amplifier control unit
N30/4 Electronic Stability Program control unit
N51/5 Adaptive damping system control unit
N62 PARKTRONIC system control unit

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FG00.19 Electrical System <> Networking 38

FG54.21 Electrical System <> Signal Acquisition and Actuation Module (SAM) 21.02.2007

Front SAM

The front SAM/SRB control unit (N10/1) is installed in the engine

compartment in the driver-side control unit box.

The most important functions are:

• Control of the front exterior lights
• Master of the turn signal function
• Control of the cornering illumination
• Rain closing of the tilting/sliding roof
• Actuation of the central locking elements of the rear doors (discrete line)
• Crash emergency opening of the central locking via an integrated crash
sensor (6g)
• Integrated central gateway (CGW [ZGW])

Gateway between the following CANs:

• Interior CAN GT54_21_0190_C71
• Chassis CAN
• Diagnostic CAN
• Front end CAN

Gateway between the following LINs:

• Instrument panel LIN
• Wiper/inside rearview mirror LIN

02/07 Cars • Overall Vehicle C-Class (W204) Initial Training Information Module 00_In_LT18_1511_1901_V01_PCEA_02.02.07

FG54.21 Electrical System <> Signal Acquisition and Actuation Module (SAM) 39
Rear SAM

The rear SAM/SRB control unit (N10/2) is installed on the wheelhouse on the
right side of the trunk.

The most important functions are:

• Control of the rear exterior lights
• Master of the ATA [EDW]
• Master of the central locking system
• Battery state recognition
• Control of the on-board electrical system management

Gateway between the following LINs:

• On-board electrical system LIN (IBS-LIN)
• Alarm sirens LIN

GT54_21_0191_C71
Notes

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FG54.21 Electrical System <> Signal Acquisition and Actuation Module (SAM) 40
Relay assignment of the fuse and relay box (SRB)

Relay assignment of front SRB

Relay Designation
Y Circuit 15
S Circuit 15R
L Spare
M Circuit 50 (starter)
N Circuit 87 engine
O Fanfare horn
P Secondary air injection pump or oil cooler (AMG)
Q Spare
R Circuit 87 suspension
GT54_21_0192_C05

Relay assignment of rear SRB

B Relay Designation
A Circuit 15
C A G
B Circuit 15 R (1)
D E
C Rear windshield heater
F
D Fuel pump relay
E Spare (rear wiper only for S204)
F Partially electric seats
G Circuit 15R (2)

GT54_21_0193_C05

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FG54.21 Electrical System <> Signal Acquisition and Actuation Module (SAM) 41
FG54.15 Electrical System <> Fuses 21.02.2007

Fuse installation locations

The prefuse box F32 is installed on the right of

the engine compartment in all engine variants.
The prefuse box F33 in the trunk is only installed
in vehicles with diesel engines. Assignment and
equipment of the main fuse boxes can be found
on the fuse assignment diagram in the vehicle.

P54.15-3024-09
Legend
F32 Engine compartment prefuse box
F33 Trunk prefuse box
F34 Cockpit fuse box
N10/1 Front SAM/SRB
N10/2 Rear SAM/SRB

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FG54.15 Electrical System <> Fuses 42

Assignment of prefuse box F32
Fuse no. Value in A Designation
f88 400 Alternator (G2) (B+) (pyrofuse)
f89 125 Front SAM/SRB control unit
f90 40 Rear SAM/SRB control unit
f91 80 Suction fan control unit
f100 40 Air conditioning blower motor
f101 60 Circuit 30z
f102 200 Glow output stage (diesel only)
f103 150 PTC heater booster (diesel only)
f104 70 Cockpit fuse box F34
f105 100 Front SAM/SRB control unit GT54.15_0102_C71

f106 150 Rear SAM/SRB control unit

f107 – Not assigned
f108 – Not assigned
f109 – Not assigned
f110 – Not assigned

Assignment of prefuse box F33

Fuse no. Value in A Designation
Circuit 30z motor electronics control
111 60
unit
112 80 Spare
113 40 Spare
114 80 Spare
115 100 Spare
GT54.15_0106_C71

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FG54.15 Electrical System <> Fuses 43

FG54.10 Electrical System <> On-Board Electrical System Management 21.02.2007

Prefuse box F32

The on-board electrical system management is integrated into the rear SAM
control unit with fuse and relay module (N10/2) and is responsible for
ensuring the supply to all electrical consumers, based on need and situation,
as well as the vehicle's ability to start.
Quiescent
The following components play a decisive role in the implementation of the current cutout
on-board electrical system management: relay
• On-board electrical system battery (G1)
• Alternator (G2)
• Battery sensor (B95)
• Rear SAM control unit with fuse and relay module (N10/2)
• ME-SFI [ME] control unit (N3/10) Pyrofuse
• Prefuse box F32 with quiescent current cutout relay (F32K2)

Prefuse box F32 with

• Prefuses
• Quiescent current cutout relay
• Pyrofuse
• Jump-starting point

Information for Service

The components in the prefuse box cannot be replaced individually.

GT54_15_0105_C82

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FG54.10 Electrical System <> On-Board Electrical System Management 44

Battery sensor (B95)

Exercise
The battery sensor (B95) and the rear SAM are responsible for the on-board
electrical system management. Installed directly at the negative terminal, the
battery sensor measures voltage, current and temperature at the on-board Negative
electrical system battery and uses these to evaluate the battery's status.
The following measures can be introduced to stabilize the on-board electrical
system:
• Specification of the optimum charging voltage
• Gradual consumer shutoff (no display in instrument cluster)
• Idle speed increase
The battery sensor is also used for checking the quiescent current.

Quiescent current cutout relay

Exercise
Battery sensor (B95)
The quiescent current cutout relay is a bistable relay. It separates the
consumers and components at circuit 30g. If the ignition is turned off or the
ignition key is removed, the quiescent current switch relay opens after 6
hours or it opens if the on-board power supply voltage falls below 11.8 V. The
quiescent current cutout relay is actuated by the rear SAM.

Pyrofuse

Exercise
A pyrofuse, which disconnects the starter and alternator line from the battery
in the event of a collision, is used in the prefuse box. It is activated by the
ARAMIS control unit (airbag).
GT54_10_0112_C82

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FG54.10 Electrical System <> On-Board Electrical System Management 45

FG82.10 Electrical System <> Illumination 21.02.2007

There are three different light systems to choose from for model series 204:
• H7 halogen headlamps (standard)
• Bi-xenon headlamps with cornering illumination (SA 614)
• Intelligent Light System (SA 622)

Also installed for all three light systems is a light sensor, which permits the
automatic exterior light control via the two SAM control units.
In the basic lighting version, the mirror turn signal and the center high-
mounted brake lamp are designed as LEDs, in vehicles with intelligent light
system (ILS) the rear turn signal lamps are also fitted with LEDs. The brake
light has a "contactless" brake light switch and is designed as an adaptive
brake light.

The familiar functions of emergency light and substitute light are also
implemented. In vehicles with ILS the following extended functions are also
implemented:
• Dynamic curve illumination
• Cornering illumination
P82.10-4659-71
• Dynamic headlamp range control
• Country light (new)
• Motorway lights (new)
• Extended fog light function (new)

Information for Service

The control units for bi-xenon headlamps can be replaced separately.

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FG82.10 Electrical System <> Illumination 46

Lamp unit equipment

Front illumination Rear illumination

Components Light sources Components Light sources
Left/right standing light 1/parking lights 5W Left/right brake lights/outer taillights (BL/SL/PL) 21 W (SL/PL pulsed to
(STL/PL) 5 W)
Left/right standing light 2 (STL) 5W Left/right brake lights/inner taillights (BL/SL) 21 W
(SL pulsed to 5 W)
Left/right low beam (ABL) 42 W (xenon) / Left/right turn signal (FRA) 21 W or LED 10 W
55 W (halogen)
Left/right high beam (FL) 55 W Left/right backup lamp (RFL) 21 W
Left/right front fog lamp/cornering 55 W SAE: 21 W
illumination (NSW/ABBL) Left/right front fog lamp/taillight (NSL/SL) (SL pulsed to 5 W)
Left/right turn signal (FRA) 20 W to 30 W (depending ECE: 21 W
on country) Left/right front fog lamp/inner side marker lamp (SML pulsed to 5 W)
(NSL/SML)
Left/right turn signal (FRA) in the outside 2W Center high-mounted brake lamp (3rd BL) 8W
mirrors
Left/right side marker lamp (SML) (494a) 5W Left/right license plate illumination (KZB) 5W
Bi-xenon actuator Left/right outer side marker lamps (SML) 5W

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FG82.10 Electrical System <> Illumination 47

FG82.35 Electrical System <> Windshield Wiper System 21.02.2007

Wiper system
The wiper motor M6/1 with integrated electronics is a reversing wiper system
with different speed levels. Wiper on/off or the speed setting take place via
the wiper/inside rearview mirror LIN via the SAM control unit. Finish wiping,
anti-lock device, blockage detection, and braking are all automatically
performed by the wiper system.

Note
The engine hood switch S62 is only installed on vehicles with anti-theft alarm
system (SA 551).

WARNING
On vehicles without anti-theft alarm system there is a risk of injury in the area
GT82_35_0002_C75
of the wiper.

Info:
The rain sensor is special equipment. The version with rain sensor is
indistinguishable from the outside from the version without rain sensor. On
vehicles without rain sensor, the interval stages 1 and 2 are designed as fixed
interval stages (interval pause time)

GT80_50_0024_C75

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FG82.35 Electrical System <> Windshield Wiper System 48

FG83.00 Electrical System <> Climate Control 21.02.2007

Thermatic 2-zone climate control (series production)

P83.40-3571-31

Legend Features
1 Increase/decrease temperature on left
2 Thermatic off • Sun sensor
3 Mono function • 2 interior temperature sensors
4 Cooling with air dehumidification off/on • 4 air outlet temperature sensors
5 Defrost windows
6 Increase/decrease temperature on right • Evaporator temperature sensor
7 Air recirculation mode • Coolant circulation pump
8 Rear window heater • Blower motor front
9 Increase air volume
10 Decrease air volume
• 5 air distribution actuator motors
11 Display
12 Air distribution
13 Automatic air distribution and volume

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FG83.00 Electrical System <> Climate Control 49

3-zone Thermotronic air conditioning (SA 581) Rear Thermotronic operating unit

P83.40-3572-31 GT83_57_0009_C71

Legend Features Legend

1 Increase/decrease temperature on left 1 Increase temperature

2 Automatic air distribution and air volume • Rear automatic air conditioning operating unit 2 Decrease temperature
3 Thermatic off/on • Dew point sensor 3 Increase air volume
4 Mono function • Emissions sensor 4 Decrease air volume
5 Cooling with air dehumidification off/on 5 Display
6 Residual heat • Sun sensor N22/4 Rear Thermotronic operating unit
7 Defrost windows • 2 interior temperature sensors
8 Increase/decrease temperature on right • 5 air outlet temperature sensors
9 Rear window heater
10 Right air distribution
• Evaporator temperature sensor
11 Increase air volume • Coolant circulation pump
12 Decrease air volume • Front blower motor
13 Display
14 Left air distribution
• Rear blower motor
15 Air recirculation mode • 12 air distribution actuator motors

02/07 Cars • Overall Vehicle C-Class (W204) Initial Training Information Module 00_In_LT18_1511_1901_V01_PCEA_02.02.07

FG83.00 Electrical System <> Climate Control 50

Dust filter, fluid reservoir

P83.00-2241-06 GT83_00_0134_C76

The dust filter is designed as a combination filter. Fluid reservoir (drier) on the right of the condenser.
Legend
1 Unlocking
2 Dust filter
3 Air conditioner housing
A32m1 Blower motor

Information for Service

The combination filter is replaced as necessary or at the latest at Service B.

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FG83.00 Electrical System <> Climate Control 51

Chassis 21.02.2007

Learning objectives
• You can explain and demonstrate the operation/handling
of the trailer hitch in a manner that is appropriate for
customers.
• You can describe the differences in the brake systems in
model series W203 and W204.
• You can explain the system structure and function of the
parking brake.
• You can describe the 4 suspension versions in model
series W204 and explain the distinguishing technical
features.

P00.00-4017-50

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Chassis 52
FG31.00 Chassis <> Trailer Hitch (SA Code 550) 21.02.2007

System description

A mechanical swivel trailer hitch is used in model series W204.

Towing capacity: not braked 750 kg

braked 1800 kg
Tongue weight capacity: 50 kg

It locks in the swiveled-in and swiveled-out position mechanically.

The lock can be released mechanically via the operating unit, which is located
on the left in the trunk, and the ball neck can be swiveled in and out.
Legend
1 Light emitting diode
Procedure for swiveling in or out: 2 Operating unit

Move operating unit into the adjustment position by pulling.

The ball neck is moved out of the secure detent position by twisting it.
Latch the ball neck securely until the LED goes out.

Error situation:
If it is "not securely latched in" this is indicated by a flashing light emitting
diode, which is integrated into the operating unit.
In this case, when the ignition is switched on the driver information "Trailer
hitch – check lock“ appears in the instrument cluster.

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FG31.00 Chassis <> Trailer Hitch (SA Code 550) 53

Component description

Trailer recognition control unit (N28/1)

The trailer recognition control unit (N28/1) (SA)

is installed on the right side of the trunk.

Exercises
• Trailer recognition
• The trailer recognition control unit (N28/1)
recognizes, by monitoring the current of the
outputs for "left turn signal“ and "brake
light“, whether or not the power supply for a
trailer is plugged in. If one of the two loads is
detected, the trailer is deemed recognized.
• Actuation of the trailer lighting
• Monitoring of the ball neck lock
• Bulb monitoring of the trailer
• Shutoff of circuit 30 at the trailer socket, if
consumer shutoff is active, by the on-board
electrical system management in the rear
SAM control unit with fuse and relay module
(N10/2). The shut-off element is seated in
the trailer recognition control unit (N28/1).
P31.19-2368-04
Legend

N28/1 Control unit for trailer recognition

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FG31.00 Chassis <> Trailer Hitch (SA Code 550) 54

FG32.00 Chassis <> Chassis Versions 21.02.2007

The C-Class in model series 204 is available in four suspension versions. 3. Rough road suspension
The rough road suspension of the new C-Class is also designed with a view to
1. Basic suspension comfort with a vehicle level that is 15 mm higher than the basic suspension.
The basic suspension (Agility Control suspension) is distinguished by the The higher driving level is achieved by a longer damper tube with spring cups
comfort-oriented tuning of the suspension components, which at the same set higher for the front axle suspension strut and longer rear axle springs. The
time meets the high demands for vehicle responsiveness. dampers of the rough road suspension are also equipped with amplitude-
The classic tuning conflict in the suspension can largely be resolved in the selective dampers, adapted to the handling characteristics of the basic
new C-Class by using an amplitude-selective damping system (SDD – Stroke suspension.
Dependent Damping).
4. Advanced Agility package (available from September 2007)
2. Sports suspension Continuously variable damping technology is used for the very first time in the
C-Class as part of the Advanced Agility package. The system, which is unusual
In addition to the basic suspension, there is also a sports suspension available
for this vehicle category, takes into account in particular the demands for a
for the new C-Class. The sports suspension differs from the basic suspension
very high degree of responsiveness, without neglecting the comfort
firstly by a level lowered by -15 mm. Furthermore, as a result of a stiffer
requirements, for which the brand is known.
damper tuning, the sprung mass vibrations are dampened to a greater extent,
the alternate roll support is increased in comparison to the basic suspension
due to stiffer stabilizer bars. As for the basic suspension, the front axle and
Information for Service
rear axle dampers are designed as amplitude-selective dampers (SDD). This
also ensures a much greater ride comfort for sports suspensions. Any necessary leveling is performed on all suspension versions by means of
springs of different lengths.

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FG33.00 Chassis <> Front Axle 21.02.2007

To achieve maximum vehicle dynamics, the front axle units including the
steering gear are preassembled together with the engine and transmission on
a frame-type integral support.

The principle of a 3-link front axle, but in a more advanced design, has been
selected for the front suspension.

Its basic features are two individual links (torque strut and cross strut) in the
bottom link level, whose need for power has been further reduced with a view
to improving comfort.

The stabilizer bar is connected to the suspension strut. The rubber bushings
are vulcanized on.

The torque strut, which faces forward at an angle, as well as the cross strut
located in the transverse direction are designed as weight-optimized forged
aluminum components. The third link is the tie rod as part of the new rack-
and-pinion steering.
P33.00-2084-50

Service information

• The correction of camber and caster is performed in the same way as for model series W 203 via "repair bolts".
• The stabilizer bar at the front axle has "rubber bushings that are vulcanized on" and is only replaceable in its entirety.

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FG33.00 Chassis <> Front Axle 56

FG35.00 Chassis <> Rear Axle 21.02.2007

All components of the rear axle have been modified with the aim of increasing
comfort. The design of the subframe carrier, struts, the wheel carriers and the
subframe has been revised. In the new development, a lightweight design has
been implemented throughout, e.g. the subframe in thinner panel thicknesses
and wheel control parts made from aluminum to reduce the unsprung masses.
As a result of these measures, it has been possible to achieve a suspension of
outstanding comfort with exceptional vehicle dynamics.

The front subframe carrier is hydraulic, the spring control arm bearing is
integrated into the rear axle carrier.

The frontmost rear axle gear bearing is bolted on.

Additional support pates at the front (for NVH/crashes).

NVH = Noise, Vibration, Harshness.

P31.00-2072-50

Information for Service

• The stabilizer bar at the rear axle has "rubber bushings that are vulcanized on" and is only replaceable in its entirety.

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FG42.00 Chassis <> Brake System 21.02.2007

Service brakes
The brake system for the sedan in the new C-Class with the hydraulic dual-
circuit brake and the division into two brake circuits for front and rear axle
largely corresponds to the previous version.
All versions are equipped with floating caliper brakes at the front and rear.

Service information:

• The brake lining wear contacts are located at the right front and right
rear wheel brakes.
• After the entire ESP assembly or the ESP control unit has been replaced,
the "initial startup routine" must be carried out using DAS.
• If two or more lines were detached from the ESP hydraulic unit, then a
subsequent "check for wrong connections“ must be performed using
DAS.
GT42_00_0061_C01
• The "initial startup routine" must be carried out using DAS after the
"yaw rate, lateral and longitudinal acceleration sensor" component
Integrated into the standard installation "ESP brake", which is controlled via
has been replaced.
the ESP control unit and the ESP hydraulic unit that is connected directly to
• When bleeding the brake system, the brake pedal must be operated it, are the following functions:
during the entire procedure (pumping).
The bleed screw can remain open during this time. Base functions: ABS, ASR, ETS, ESP, BAS
• When changing the brake fluid, “pumping" is not necessary.
Assist functions: Cruise control, tire pressure loss warner

Added-value functions: Hill Start Assist, trailer stabilization, dry braking,

precharging, AIR Gap, PRE-SAFE-MASTER, adaptive
brake lights

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Parking brake

The vehicles in model series W204 are equipped with a mechanical parking
brake.
A spring is integrated into the parking brake pedal.
This compensates for any "cable slack“.

Information for Service

• The parking brake is maintenance-free and does not require

adjustment.
• For work on the parking brake, use the following special tool to
disconnect the cables:
W204 589 00 16 00.
• The basic setting of the parking brake takes place "at the wheel
brake“ using knurled screws.
P42.20-2365-09
Notes Legend

1 Parking brake pedal assembly

2 Electrical connectors
3 Trigger cable
4 Retaining tab
5 Front brake cable
6 Disconnection point
7 Screws
8 Retaining clip
9 Parking brake pedal
S12 Parking brake indicator switch

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FG46.00 Chassis <> Steering 21.02.2007

Installed in the basic vehicle with the AGILITY CONTROL steering is a standard
steering gear (i = 14.5) from ThyssenKrupp Presta SteerTec.
Speed-sensitive power steering with the variable mid-centering already used
in the S-Class is available as special equipment.
Both the manual torque and also the mid-centering are dependent on speed.
Consequently, the manual torque already known from the speed-sensitive
power steering for parking and maneuvering procedures and the maximum
rigidity and stability of the vehicle at high speeds have been expanded by a
very responsive on-center feeling.
A dedicated steering gear with a more direct steering ratio (i = 13.5) has been
developed for the sports suspension special equipment and the "ADVANCED
AGILITY package“ special equipment with sports driving mode.
This is intended to underscore the sporty nature of this special equipment.
This steering gear is only available as speed-sensitive power steering. P46.20-2336-05
A further variant is a specially adapted standard steering gear for USA and
Legend
Canada.
The steering gear housing is designed as two pieces. Both the steering gear 1 Retaining plate
2 Screw
housing and the valve housing are made from aluminum to cut down the 3 Pipeline
weight. 4 Bolt
The toothed rack is made of high-strength steel. This has achieved a weight 5 Pipeline
6 Bolt
saving of around 0.8 kg compared to the W 203. 10 Rack-and-pinion steering
The steering gear is rigidly connected to the frame-type integral support.
The toothing is constant across the steering wheel angle.

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FG46.00 Chassis <> Steering 60

Service information Notes
• The steering play is adjusted using the thrust piece by means of a
"special screw"
• Evaluating the steering rack when repairing accident vehicles:

Accidents with body damage:

For accidents resulting in body damage (e.g. distorted fender, longitudinal
member, side paneling, rear section, etc.), the steering gear may still be
used provided that parts of the front axle, the steering gear or the
steering linkage have not been damaged.

Accidents with permanent distortions at the front axle or steering

linkage:
The steering gear must be replaced for safety reasons if parts of the front
axle, the steering gear or the steering linkage have been permanently
distorted.

Accidents in which the driver airbag has deployed:

In the event of accidents that caused the driver airbag to deploy, the
steering wheel and the jacket tube must always be replaced.

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Telematics 21.02.2007

Learning objectives

• You can name the various devices and

describe the design and the function of the
systems.
• You can describe the system design and
function of basic and comfort telephony.
• You can name the connection options for
telematics accessories.
• You can connect/disconnect telephones to
the vehicle via Bluetooth.
• You can transfer the telephone book from the
portable CTEL to the HU.
• You can define the telephone book functions
of "Add, Overwrite, Delete".
• You can transfer MP3 files from various media
to the HU and describe the "Music Register"
function.
• You can operate all NTG4 systems in principle.
• You can operate the SDS/voice control
system in principle and name differences in
the individual functions compared to previous
systems.
GT82_86_0006_C77

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Telematics 62
FG82.55 Telematics <> Audio/Navigation Systems 21.02.2007

NTG4 (new telematics generation 4) device overview

AUDIO 20 AUDIO 50 COMAND APS

GT82_86_0001_C01 GT82_86_0002_C01 GT82.86_0004_C04

1 Display
2 Display control
1 Display switch
2 Head unit 3 Head unit
3 Audio/COMAND 4 Audio/COMAND
controller controller
P82.86-6188-31 GT82.86_0003_C01 P82.86-6145-31 GT82_86_0005_01

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FG82.55 Telematics <> Audio/Navigation Systems 63

Function overview

SE 523 SE 525 SE 527

Audio 20 Audio 50 COMAND

- FM/AM radio with FM diversity - FM/AM radio with FM diversity - FM/AM radio with FM diversity
- CD drive (MP3/WMA) - DVD drive (DVD audio, MP3/WMA, navigation - DVD drive (DVD audio, MP3/WMA/AAC,
- Basic Bluetooth telephony data) navigation data)
- 5" color TFT display - Basic Bluetooth telephony - Basic Bluetooth telephony
- 5" color TFT display - HDD map navigation
- MOST connection (for the sound option) - Voice control/Text to Speech
- PCMCIA card slot
- Music Register (size 4 GB)
- 7" color TFT display (swiveling)
- MOST connection (for the sound option)

SE 510 SE 511 SE 512

Audio 20 with integrated Audio 50 with integrated COMAND with integrated
6-disk CD changer 6-disk DVD changer 6-disk DVD changer

+ 6-disk CD changer + 6-disk DVD changer (DVD audio) + 6-disk DVD changer (DVD audio/video)
+ MOST connection (for the sound option) + Voice control/Text to Speech
L Navigation DVD must be inserted into slot 6
for navigation.

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NTG4 device features

• Similar design to NTG3

• The telematics CAN connects the 3 main components:
- Head unit – central display – audio controller
- Video signal from the HU to the central display
• The MOST fiber optic cable is not absolutely essential
• The following special equipment can be optionally connected to the
MOST fiber optic cable:
- Surround Sound system (harman/kardon)
- Satellite Radio (SDAR for USA)
- Digital Audio Broadcast (DAB for Great Britain)

GT00_19_0186_C81
Legend

A Telematics CAN
B Interior CAN
C Video signal

A40/3 Audio/COMAND
A40/8 Audio/COMAND display
A40/9 Audio/COMAND control panel
N40/3 Sound system amplifier control unit (SA)
N87/3 Digital audio broadcast (DAB) control unit - (GB)
N87/5 Satellite digital audio radio (SDAR) control unit - USA

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FG82.85 Telematics <> Overview of the New COMAND Functions 21.02.2007

Possible media/formats
CD/DVD PCMCIA Music register
MP3 MP3 MP3
WMA WMA WMA
AAC AAC AAC
CD audio
Audio DVD:
DVD video

GT82_86_0007_C81
Music register status indication
All of the file formats listed in the table can be copied from CD/DVD, as well as from the
PCMCIA interface, to the "music register". The files stored in the "music register" can
also be stored in folders, renamed, or individually deleted.

Music formats:
MP3 = MPEG-1 audio layer 3 (lossy audio compression)
WMA = Windows Media audio (lossy audio compression from Microsoft)
AAC = Advanced audio coding (lossy audio compression from Apple)

Legend

1 Copy music files (selection menu)

2 Data storage device selected (Ex. CD 5, MP3_ARCHIVE)

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FG82.70 Telematics <> Telephone 21.02.2007

Telephony in model series 204 is categorized into basic and comfort

telephony (SA 386).

Features of basic telephony are: Features of comfort telephony are:

• Basic telephony is provided if the vehicle is equipped with one of the • Permits a portable CTEL to be connected via a corresponding cradle.
Audio 20, Audio 50 or COMAND APS versions. • Permits hands-free operation.
• Permits a portable CTEL to be connected via Bluetooth. • Permits a portable CTEL to be charged via the cradle.
• Permits hands-free operation (in the 'hands-free profile'). • Permits a portable CTEL to be connected to the exterior antenna.
• Permits phone numbers to be dialed via the head unit. • Permits SMS messages to be received and sent.
• Permits the telephone book to be downloaded.
• Also provides the functions of basic telephony.

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FG82.70 Telematics <> Telephone 67

System networking for telephony

Basic telephony Comfort telephony

GT00_19_0179_C76 GT00_19_0178_C76

Legend
A2 Radio A34/15 Mobile phone holder
A2/18 FM, AM and CL [ZV] antenna amplifier A40/8 Audio/COMAND display
A2/19 Rear window antenna FM antenna amplifier A40/9 Audio/COMAND control panel
A2/91 Bluetooth antenna A94/1 TV antenna 1 and DAB band III
A28/11 Multifunction antenna B25/7 Voice control system microphone

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FG82.70 Telematics <> Function Overview of Basic/Comfort Telephony 21.02.2007

The following steps are required to connect a portable CTEL with basic
telephony via Bluetooth:
• Bluetooth on portable CTEL must be activated and visible.
• Via System menu Æ System settings Æ Connect Bluetooth
• Or via Telephone menu Æ Telephone Æ Telephone list Æ Update

Only one portable CTEL can be operated at a time with basic telephony.
GT82_70_0084_C75
The following steps are required to connect a portable CTEL with comfort
telephony in the vehicle:
• The telephone (comfort telephony) must be selected via the telephone
list.
• The telephone bracket must be plugged in.
• The appropriate portable CTEL must be inserted into the telephone
Legend
bracket.
M Portable CTEL
A Bluetooth module is integrated in the connector for the cradle, which A34/15 Cradle
enables communication between the portable CTEL and head unit. The GT82_70_0085_C76
following selections are possible after a portable CTEL has been connected
via comfort telephony:
• SMS
• Manual downloading of the address book
• Voice control of telephone
• Dialing a telephone number using the numeric keys on the head unit
• Dialing a telephone number from the transferred telephone book

GT82_70_0086_C81

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FG82.70 Telematics <> Voice Control System (VCS) 21.02.2007

The voice control system is able to control the following systems for vehicle
telematics:
• Telephone
• Navigation
• Address book
• Audio systems (radio, CD/DVD, MP3, hard disk, etc.)

Further developments of already familiar systems have once again lead to

considerable improvements. The following functions are, for example, possible
for telephone operation:
• Selecting a name from the telephone book without prior voice tag
• Selecting a name from the telephone book with prior voice tag
• Listening to the telephone book
• Entering a telephone number in one go (complete)
• Entering a telephone number in groups
• Entering a telephone number number-by-number
Legend

Complex names (towns, streets) can now also be spoken when controlling 1 Voice control activate button
2 "Abort" button
navigation and no longer have to be spelled. Of course, a "retraining" function 3 Accept call
is also available.

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FG82.62 Telematics <> Antennas 21.02.2007

A so-called multifunction antenna is located in the rear section of the vehicle

roof.
The following antennas can be found here, depending on the vehicle
equipment:
• Telephone (GSM)
• Navigation (GPS)
Legend
• Digital radio (DAB) only UK
• Satellite radio (SDAR) only USA A28/11 Multifunction antenna
P82.62-3129-06

The Bluetooth antennas for the head unit (installed in all head units) are
located in the overhead control panel. A further Bluetooth antenna in installed
in the connector for the portable CTEL cradle for comfort telephony (see the
chapter on telephones).

The AM/FM radio antennas and receiving antenna for central locking are N70 Overhead control panel
located in the rear window again and are contacted via the two A2/18 and A2/91 Bluetooth antenna
A2/19 antenna modules. P82.62-3130-06

A2/18 FM, AM and CL antenna

amplifier
A2/19 FM antenna amplifier
GT82_62_0052_C06

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1511 1902 02 1. edition 02/07 80