Mercedes w204 fuse and relay

Mercedes w204 is the 3rd generation of C-class cars of the German automaker Mercedes-Benz which was produced in 2007, 2008, 2009, 2010, 2011, 2012, 2013 and 2014 with various engine options (C180 cdi, C230, C280, C 300 (4MATIC), C350, C63 AMG etc.). During this time, the model has been restyled. In this material, we will show the locations of electronic control units, a detailed description of the fuses and relays Mercedes 204 with box diagrams and photo examples of their execution. Select the fuse responsible for the cigarette lighter.

Mercedes w204

The location of the blocks and the purpose of the elements in them may differ from those shown and depend on the year of manufacture and the level of electrical equipment of your car.

Location

Control units

The general layout of the control units in the Mercedes w204

Layout

Assignment

1ABS electronic control unit
2Air conditioning electronic control unit – in the heater control panel
3A/C/Heater Fan Motor Control Module – Near Heater Fan Motor
4Antenna Booster 1 – Rack (Station wagon)
5Antenna booster 1 – ceiling panel (saloon)
6Antenna signal amplifier 2 – in the rear door (station wagon)
7Antenna Booster 2 – C-Pillar (Saloon)
8Anti-theft siren – behind the wheel arch
9Additional battery – under the floor
10Secondary battery relay – under floor
11Battery (Diesel) – under the floor
12Battery (gasoline)
13Battery Current Monitor Relay (Shared with Engine Compartment Fuse/Relay Box 2)
14Diagnostic connector (DLC)
15Control unit for electrical equipment of the left front door
16Left rear door electrical control unit
17Control unit for electrical equipment of the right front door
18Control unit for electrical equipment of the right rear door
19Electronic engine control unit (Diesel) – engine 651
20ECM (Diesel) – Except 651 Engine
21Electronic engine control unit (petrol)
22Fuel Pump Control Module – Engine 271 – Behind Right Trim
23Fuel pump control unit – except engine 271 – under rear right seat
24Fuse/Relay Box, Engine Compartment 1
25Fuse/Relay Box, Engine Compartment 2 (Fusible Links in Engine Compartment Fuse Box) – Power Circuits: A/C, Alternator, Secondary Battery Relay, Engine Compartment Fuse/Relay Box 1, ECM, Cooling Fan Motor, ECU Dashboard Fuse/Relay, Heater Fan Motor Resistor, Intake Air Heater Heater (Diesel), Ignition Switch Control Module, Trunk Compartment Fuse/Relay Module 1, Multi-function Control Module 1/2, Starter Motor, SRS System
26Fuse/Relay Box, Instrument Panel
27Fuse/Relay Box, Luggage Compartment 1 – Behind Right Trim
28Fuse/relay box, luggage compartment 2- underfloor
29Glow plug control unit
30Headlight control unit, left (xenon headlights)
31Headlight control unit, right (xenon headlights)
32Horn 1 – behind the front bumper
33Horn 2 – behind the front bumper
34Ignition lock control unit
35Control unit for central locking and engine start remote control – behind the right trim
36Lighting control unit
37Multi function Control Module 1 – Attached to Engine Compartment Fuse/Relay Box 1 – Functions: A/C Compressor, A/C Pressure Control, Brake Fluid Level, Coolant Level, Headlights, Hazards, Headlight Washers, Windshield Washer Nozzle Heaters, Buzzer signals, direction indicators, interior lamps, ambient temperature sensor, windshield wipers
38Multi function control box 2- attached to fuse/relay box 1 in luggage compartment – functions: Anti-theft system, central locking, fuel filler hatch/cap, rear window defroster, seat heater, rear lights, rear sunblind, (tailgate)
39Multi function switch control module 1 – Functions: Front seat heater, parking system, rear window blind, stop-start system, suspension control system
40Multi function switch control unit 2 – functions: Air conditioning, anti-theft system, interior lamps, local illumination lamps, sunroof
41Ambient temperature sensor
42Parking system control unit – under mat
43Seat adjustment memory control unit (left)
44Seat adjustment memory control unit (right)
45Control unit for electrical equipment of the steering column – under the steering wheel
46Steering column lock control unit
47Sunroof electric control unit
49Suspension control unit (with active suspension system) – under the carpet
50The control unit of the drive for opening / closing the rear door – pillar “D” (station wagon)
51Trailer ECU – Behind Right Trim
52Electronic transmission control unit (722.6) – under the rug
53Electronic gearbox control unit (722.9) – in the gearbox
54Gear shift control unit – selector
55Tire pressure monitoring control unit – behind left trim

Fuse and relay boxes

Diagram

location

Designation

  • F32 – Front input power fuse box
  • N10/1 – SAM control unit with front relay and fuse box
  • N10/2 – SAM control unit with rear relay and fuse box
  • F33 – Rear power fuse box
  • F34 – Fuse box in the cabin

Passenger compartment

Inside the Mercedes 204, the main fuse box is located at the end of the dashboard, behind a protective cover.

Photo

Diagram

Diagram

Appointment

11630A Driver’s seat control unit (until 05/31/09)
11715A Control unit for adaptive damping system (until 05/31/09)
118Reserve
1197,,5A Rear fan motor (until 05/31/09)
AMG Performance Media control unit (up to 1.6.12)
120Reserve
121Reserve
122Reserve
12310A Steering column electronic module control unit
124Reserve
125Reserve
12630A Front passenger seat control unit (up to 05/31/09)
127Reserve
128Reserve
12920A Oil cooler fan motor relay (engine 156; before 05/31/09)
130Reserve
131Reserve
132Reserve
133Reserve
134Reserve
135Reserve

Engine compartment

Fuse and relay box

The main fuse and relay box under the hood is located on the left side.

Photo of fuse box Mercedes 204

Diagram

MB Diagram 2

Decoding

125A Блок управления электронной системой стабилизации движения ESP
230A Блок управления передней левой двери
330A Блок управления передней двери справа (до 31.3.10 г.)
47,5A Блок управления топливного насоса (бензиновые двигатели)
Fuel pump control unit on the left (engine 156)
Right fuel pump control unit (engine 156)
Condensation sensor in the fuel filter with heating element (engines 642, 651)
Condensation sensor control unit in the fuel filter with a heating element (engines 651 (up to 31.5.10), 646)
20A Headlight control unit (from 1.3.11)
57.5A SAM control unit with fuse and relay module in the rear
Relay for the circulation circuit of the coolant of the rear axle gearbox (engine 156 from 1.7.11)
Outdoor lighting switch (from 1.12.09)
610A CDI control unit (diesel engines)
ME control unit (petrol engines)
720A Starter
87.5A Passenger restraint system control unit
915A Socket in glove box
1030A Wiper motor
117.5A Audio/COMAND Display
Audio control panel /COMAND
Holder for navigation module
127.5A Climate control panel
Upper block control panel
137.5A Steering column electronic module control unit
Multifunction camera (since 1.3.11)
147.5A Control unit for electronic stabilization system ESP
157.5A Passenger restraint system control unit
Restraint control unit
165A Diagnostic socket (until 5/31/09)
electr. mobile phone plug connection (until 2008)
Selector lever electronic module control unit (KP 722)
1730A Panoramic sunroof control module
Ceiling control box control box
187.5A Switch for exterior lighting (until 2008)
Upper block control panel control unit (as of 1.3.11)
Termination of the positive wire of the LIN data bus of the instrument panel air conditioning system (until 28.2.11)
Electrical plug connection for vehicle interior and cable harness for tail light
1920A Electric steering lock control unit
Electronic ignition lock control unit
2040A ESP control unit
217.5A Brake signal sensor
Glove box light switch
Seat occupied recognition and front passenger seat AKSE
Electric fuse preparation for installation of the Electronic Toll Collection system (Japan)
2215A Combustion engine fan motor and air conditioner with integrated regulation
Electrical plug-in connection for passenger compartment and engine wiring harness
Cable lug electr. circuit terminal 87 M2e (engine 271; South Korea), (engine 272; USA)
ME control unit (engine 271; South Korea)
Regeneration switching valve (engine 271; South Korea), (engine 272; USA)
CDI system control unit (engines 642, 646)
Heating element in crankcase ventilation duct (engine 642)
Cable lug electr. terminal 87 circuits (engine 646)
2320A Electrical connector for passenger compartment and engine wiring harness
SAM control unit with fuse and relay module in the rear (diesel engines)
CDI system control unit (diesel engines up to 2008)
Cable lug electr. terminal 87 circuits (diesel engines up to 2008)
Cable lug electr. circuit terminal 87 M1e (engine 271 until 2008)
Cable lug electr. circuit terminal 87 M1i (engine 272 until 2008)
2415A Electrical connector for passenger compartment and engine wiring harness
Radiator shutter actuator (engine 642)
CDI control unit (engine 646)
Cable lug electr. circuit terminal 87 M1i (engine 272 until 2008)
Cable lug electr. terminal 87 circuits (diesel engines up to 2008)
2515A ME control unit (engines 156, 271, 272, 274, 276)
Lambda probe in front of the catalyst (engine 651)
The control unit for the sound generator of the exhaust system (engine 651)
2620A Audio module
Audio module with Auto-Pilot system
COMAND control module
277.5A Electronic ignition lock control unit
Electric steering lock control unit (up to 2008)
CDI control unit (diesel engines)
ME control unit (petrol engines)
287.5A Instrument cluster
2910A Front right headlight
3010A Front left headlight
Electrical plug-in connection for passenger compartment and engine wiring harness (engine 642)
31A15A Left horn
Right horn
31B15A Left horn
Right horn
3240A Electric air pump (engines 156, 271, 272)
3310A Control unit for automatic transmission electronic control system (KP 722.6)
Control unit for fully integrated automatic transmission control system (KP 722.9)
347.5A Fuel pump control unit (engines 274, 276), (engines 271, 272, 651 from 1.6.09), (engine 642 from 1.12.09)
355A ESP control unit (since 2009)
367.5A Electrical control module DISTRONIC
Electro-hydraulic power steering (since 2009)
Relay
JRelay terminal 15
KRelay terminal 15R
LReserve
МTerminal 50 relay, starter
NTerminal 87 relay, motor
OHorn relay
PCatalyst Purge Relay
QOil cooler fan motor relay
RTerminal 87 relay, running gear

Power fuse box

Installed on the right side, next to the rack.

Photo 3

Type 1

Diagram

Diagram 3

Allocation

88Pyrofuse:
Generator
Starter
88400A Generator (until 2009)
89125A Front SAM control box with fuse and relay module
9040A SAM control unit with fuse and relay module in the rear
9180A Combustion engine fan motor and integrated air conditioning
10040A Fan regulator
Air conditioning box (until 2009)
10160A Front SAM control box with fuse and relay module
Fuse holder, rear left door control unit (UK)
Fuse Holder, Rear Right Door Control Module (UK)
102Reserve
103150A Electric auxiliary heater (diesel engines)
Fuse holder, rear left door control unit (UK)
Fuse Holder, Rear Right Door Control Module (UK)
10470A Interior fuse box
105100A Front SAM control box with fuse and relay module
106150A SAM control unit with fuse and relay module in the rear
107Reserve
108Reserve
109Reserve
110Reserve

Type 2

Diagram for models without “ECO Start-Stop”

Diagram 3-1

Diagram for models with “ECO Start-Stop”

Diagram 3-2Appointment

150400A Igniter 88 (without “ECO Start-Stop”)
200A Generator
Starter
151100A Combustion engine fan motor and air conditioner with built-in regulation
152150A Front SAM control box with fuse and relay module
15360A Front SAM control unit with fuse and relay module (vehicles with “ECO Start-Stop”)
15460A Front SAM control unit with fuse and relay module (without “ECO Start-Stop”)
150A Electric auxiliary heater (vehicles with “ECO Start-Stop”)
155Reserve
156150A Additional electric heater (without “ECO Start-Stop”)
100A Front SAM control unit with fuse and relay module (vehicles with “ECO Start-Stop”)
157100A Electro-hydraulic power steering
Electric power steering control unit
15850A Fan regulator (without “ECO Start-Stop”)
150A SAM control unit with fuse and relay module in the rear (vehicles with “ECO Start-Stop”)
15950A Multifunction control unit for special vehicle (without “ECO Start-Stop”)
200A Additional battery relay (vehicles with “ECO Start-Stop”)
16060A Interior fuse box (without “ECO Start-Stop”)
50A Fan regulator (vehicles with “ECO Start-Stop”)
161100A Front SAM control unit with fuse and relay module (without “ECO Start-Stop”)
50A Multifunction control unit for special vehicle (vehicles with “ECO Start-Stop”)
16260A Interior fuse box (vehicles with “ECO Start-Stop”)
163150A SAM control unit with fuse and relay module in the rear (without “ECO Start-Stop”)
16480A SAM control unit with fuse and relay module in the rear (without “ECO Start-Stop”)

Luggage compartment

Fuse and relay box

Installed on the right side behind the side protection.

Photo 4

Diagram

Diagram 4

Decoding

377,5A Solenoid coil NECK-PRO driver’s seat headrest
5A Solenoid coil NECK-PRO front passenger seat headrest
3815A Tailgate wiper motor
3930A Left rear door control unit (until 31.3.10)
40Reserve
4130A Right rear door control unit (until 31.3.10)
Right front door control unit (from 1.4.10)
4225A Fuel pump control unit (engine 642 from 12/1/09), (engine 651 from 1/6/09)
20A Fuel pump (646 engine) (642 engine from 11/30/09), (651 engine from 5/31/09)
20A Before MY 2008:
Fuel pump control unit (petrol engines)
Fuel pump (diesel engines)
435A Rear blower motor (from 1.6.09)
4430A Front right seat adjustment switch box
Switch for partially electric adjustment of the front passenger seat
4530A Front left seat adjustment switch box
Driver’s seat partially electric adjustment switch
467.5A Rear window FM antenna booster
Antenna amplifier FM 2 and DAB
alarm siren
Interior protection and towing protection control unit
Antenna amplifier 1 on the rear window
Antenna amplifier TV 1 and DAB antenna band III
Antenna amplifier TV 2 and KEYLESS-GO
Antenna Amplifier KEYLESS-GO
47Reserve
48Reserve
4940A Heated rear window
5050A Front right seat belt reversible pretensioner
5150A Front left seat belt reversible pretensioner
52Reserve
5315/30A Trailer recognition control unit
547.5A Trailer recognition control unit (until 5/31/09)
15A Trailer recognition control unit
5A Group of switches for adjusting the lumbar support and side bolsters of the driver’s seat (since 2009)
Group of switches for adjusting the lumbar support and side bolsters of the front passenger seat (since 2009)
AMG valve block, front passenger seat (since 2009)
Driver’s seat AMG valve block (since 2009)
555A AdBlue® control unit (since 2009)
5615A Trailer recognition control unit
Trailer socket (since 2009)
5A Group of switches for adjusting the lumbar support and side bolsters of the driver’s seat (since 2009)
Group of switches for adjusting the lumbar support and side bolsters of the front passenger seat (since 2009)
AMG valve block, front passenger seat (since 2009)
Driver’s seat AMG valve block (since 2009)
5720A Trailer recognition control unit
5820/30A Trailer recognition control unit
595A Parking assistance control unit (since 2009)
DISTRONIC sensor (DTR) in the front bumper on the left (since 2009)
DISTRONIC sensor (DTR) in the front bumper on the right (since 2009)
Intelligent radar sensor in the left rear bumper (since 2009)
Intelligent radar sensor in the right rear bumper (since 2009)
7.5A PARKTRONIC control unit (until 2009)
Radar sensors control unit (until 2009)
607.5A Air pump for multi-contour seat (since 2009)
6140A Tailgate Actuator Control Module
6230A Driver’s seat control unit (from 1.6.09)
6330A Front passenger seat control unit (from 1.6.09)
6425A AC/DC converter control unit (since 2009)
6515A Control unit for adaptive damping system (from 1.6.09)
Steering column electronic module control unit (since 2009)
667.5A Gearbox oil circulation pump relay (from 1.6.12)
6730/40A Speaker amplifier control unit
68Reserve
6920A Rear sub boofer amplifier (since 2009)
705A Tire pressure monitoring control unit
7115A Cigarette lighter with front ashtray illumination
Saloon outlet front
7215A Socket in trunk
Socket 115 V
737.5A Diagnostic socket (since 1.6.09)
Driving modes control unit (engine 156 from 1.7.11)
Remote radio control receiver for auxiliary heater (since 2009)
7415A KEYLESS-GO system control unit
7520A Auxiliary heater heater (since 2009)
7615A Interior socket
777.5A Passenger weight system (WSS) control unit
787.5A Front left seat ventilation fan control (since 1.3.11)
Front right seat ventilation fan regulator (since 1.3.11)
797.5A Radar sensors control unit (until 2009)
805A Control unit for video sensors and radar sensors (since 2009)
Parking assistance control unit (from 1.6.12)
815/7.5A Multimedia interface control unit
825A UMTS mobile communication equalizer (since 2009)
TV tuner control unit (until 5/31/09; Japan)
837.5A Electronic Toll Collection control unit (up to 28.2.11; Japan)
Emergency call system control unit
Rear left display (since 2009)
Rear display on the right (since 2009)
Rear view camera electronics (since 1.6.12; Japan)
847.5A Satellite Digital Audio Radio (SDAR) control unit
SDAR Control Unit/High Definition Tuner (from 1.6.09 to 31.5.10)
Digital audio broadcasting control unit
Rear view camera power supply module (until 5/31/12)
Rear view camera control unit (until 5/31/12)
Rear view camera electronics (since 1.6.12)
Rear view camera (since 1.6.12)
360° camera control unit
857.5A TV tuner control unit (until 5/31/09; Japan)
Digital TV tuner (from 1.6.09; Japan)
867.5A DVD player (since 2009)
877.5A Emergency call system control unit
8815A Servo drive module for automatic transmission DIRECT SELECT (KP 722) (from 1.6.09)
8920A Trailer recognition control unit (from 1.6.09)
Oil cooler fan motor relay (engine 156; from 1.6.09)
Relay for the coolant circulation circuit of the rear axle gearbox (from 1.6.09)
9040A AdBlue® fuse box (from 1.6.09)
AdBlue® supply relay (from 1.6.09)
91Reserve (since 1.6.09)
92Reserve (since 1.6.09)
Relay
ARelay terminal 15
BRelay terminal 15R
CHeated rear window relay
DFuel pump relay (diesel engines)
ETailgate Wiper Relay
FSeat adjustment relay
GRelay terminal 15R

Fuses with numbers 71, 72 and 76 are responsible for the operation of the cigarette lighters.

Power fuse box

Another high power fuse box is attached to the positive terminal on the battery in trunk.

Diagram

Diagram 5

Assignment

11160A Front SAM control box with fuse and relay module
11280A Multi-function control unit for special vehicle
11340A Fuel pump control unit, left (engine 156)
Right fuel pump control unit (engine 156)
114Reserve
115100A Multi function control unit for special vehicle

 

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