Mercedes w212 fuse and relay

Mercedes W212 is the fourth generation of the E-class of the German brand Mercedes-Benz which was produced in 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 with both petrol and diesel engines (E200, E220 CDI, E250, E300, E350, E500, E63 AMG 4MATIC, etc.) with various body styles for the S212 station wagon and C207 coupe. During this time, the model has been restyled. In this publication, you will enter the locations of electronic control units, a detailed description of the fuses and relays Mercedes 212 with box diagrams and photo examples of their execution. Select the fuse responsible for the cigarette lighter.

Mercedes 212

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 w212

Location w212

Assignment

1ABS electronic control unit
2Electronic air conditioning control unit – in the heater control panel
3A/C/Heater Fan Motor Control Module – Near Heater Fan Motor
4Antenna Booster 1 – C-pillar
5Antenna Booster 2 – C-pillar
6Anti-theft siren – Behind the front right wheel arch trim
7Additional battery – under hollow luggage compartments
8Additional battery – with gearshift on the steering column
9Secondary battery relay – under hollow luggage compartments
10Battery (except engine 273)
11Battery (engine 273) – luggage compartment
12Battery Current Monitor Relay (Shared with Engine Compartment Fuse/Relay Box 2)
13Trunk lid opening/closing drive control unit – under the rear shelf
14Diagnostic connector (DLC)
15Left front door electrical control unit
16Left rear door electrical control unit
17Right front door electrical control unit
18Right rear door electrical control unit
19ECM (Diesel) – 651 engine
20ECM (Diesel) – Except 651 Engine
21Electronic engine control unit (gasoline) – engine 271
22Electronic engine control unit (gasoline) – except for engine 271
23Fuel pump control unit – under rear seat
24Fuse/Relay Box, Engine Compartment 1
25Fuse/Relay Box, Engine Compartment 2 (Fusible Links in Engine Compartment Fuse Box) – Power Circuits: ABS/ESP, A/C, Air Suspension, Alternator, Booster Battery Relay, Power Steering, Cooling Fan Motor, Air Heater Heater Element inlet (Diesel), multifunction control unit 1/2, starter, SRS system
26Fuse/Relay Box, Instrument Panel
27Fuse/Relay Box, Luggage Compartment 1 – Behind Right Rear Trim Panel
28Fuse/Relay Box, Luggage Compartment 2 – Underfloor – Engine 273
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 rear trim panel
36Lighting control unit
37Multifunction control box 1 – Attached to engine compartment fuse/relay box 1 – Functions: A/C compressor, A/C pressure control, brake fluid level, coolant level, headlights, alarms, windshield washer jet heaters, headlight washers, gauges turn signal, interior lamps, ambient temperature, windshield washer, windshield wipers
38Multifunctional control unit 2- attached to the fuse/relay box in the luggage compartment 1 -functions: Anti-theft system, central locking – trunk lid, power seats, fuel filler hatch/cap, rear window defogger, seat heater, rear lights, rear seat headrests, rear window shade
39Multifunction switch control module 1 – Functions: Auxiliary heater, front seat ventilation, front seat heater, parking assist, rear headrests, rear blind, stop-start system
40Multifunction switch control unit 2 – functions: Air conditioning, anti-theft system, interior lamps, local illumination lamps, sunroof
41Ambient temperature sensor
42Parking system control unit – under the mat
43Seat adjustment control unit (left) – on the seat
44Seat Adjustment Control Unit (Right) – On Seat
45Seat heating control unit – behind right rear trim panel
46Steering column electrical control unit – under the steering wheel
47Steering column lock control unit (some models)
48Sunroof electric control unit
49SRS electronic control unit
50Suspension control unit – under the mat
51Trailer ECU – Behind Right Rear Trim Panel
52Electronic transmission control unit (722.6) – under the mat
53Electronic gearbox control unit (722.9) – in the gearbox
54Gear shift control unit – selector
55Tire pressure monitoring control unit – above the rear axle
56Distance control (cruise control) – under the mat

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

Photo

Diagram

Diagram

Allocation

11630A Driver’s seat control unit
11715A Control unit for adaptive damping system
118Reserve
1197,,5A Rear fan motor
AMG Performance Media control unit
120Reserve
121Reserve
122Reserve
12310A Steering column electronic module control unit
124Reserve
125Reserve
12630A Front passenger seat control unit
127Reserve
128Reserve
12920A Oil cooler fan motor relay
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

Designation

125A ESP control unit (left-hand drive vehicles)
ESP Premium electronic motion stabilization control unit (left-hand drive vehicles)
Regenerative brake system control unit (left-hand drive vehicles)
Fan Regulator (Right Hand Drive Vehicles)
230A Front left door control unit (up to 05/31/2010)
Rear left door control unit (from 06/01/2010; right-hand drive vehicles)
330A Front right door control unit (until 05/31/2010)
Rear right door control unit (from 06/01/2010; LHD vehicles)
420A Fuel pump control unit (engine 157)
7.5A Fuel filter condensation sensor control unit with heating element (engine 651)
20A Fuel filter condensation sensor with heating element (engines 642, 651; before 05/31/2010)
57.5A Instrument cluster
The switch of partings of external lighting
SAM control unit with fuse and relay module in the rear
ESP electronic motion stabilization control unit (from 03/01/2013)
ESP Premium electronic motion stabilization control unit (from 03/01/2013)
610A On vehicles with a diesel engine:
CDI control unit
For vehicles with petrol engine:
ME control unit
Engines 271.958, 274.920
CNG control unit
720A Connected via starter terminal 50 relay: Starter
87.5A Control unit for passenger restraint system (Supplemental Restraint System)
915A Socket in glove box
1030A Wiper motor
30A Heated wiper blades
117.5A Audio display /COMAND
Audio control panel /COMAND
Navigation module
Holder for navigation module
COMAND fan motor
127.5A Climate control panel
Upper Control Panel Control Unit
Valid for vehicles with gearbox 722, 724, 725:
Automatic transmission mode button
Valid with code 489 (AIRMATIC):
Chassis button block
137.5A Steering column electronic module control unit
Multifunction camera
Multifunctional stereo camera (from 03/01/2013)
147.5A Control unit for electronic stabilization system ESP
Control unit for electronic motion stabilization system ESP Premium
157.5A Control unit for passenger restraint system (Supplemental Restraint System)
165A Electric air conditioner compressor
DIRECT SELECT interface (gearboxes 722.930/931)
Selector lever electronic module control unit (gearboxes 722, except 722.930/931)
1730A Ceiling control box
Panoramic sunroof control module
187.5A Switch for exterior lighting
Instrument panel switch block (until 02/28/2013)
Upper block control panel control unit (until 02/28/2013)
Auxiliary Transmission Oil Pump Relay (722 Transmissions)
Power electronic equipment control unit
1920A Electronic ignition lock control unit
Electric steering lock control unit
2040A ESP control unit (left-hand drive vehicles)
ESP Premium electronic motion stabilization control unit (left-hand drive vehicles)
Regenerative brake system control unit (left-hand drive vehicles)
217.5A Brake signal sensor (02/28/2013)
Hybrid brake light switch (02/28/2013)
Glove box light
Occupancy recognition and AKSE, front passenger seat
Weight Sensing System control unit
2215A Internal combustion engine fan motor air conditioner with built-in control (650W, 800W)
Engine 156:
Electrical plug-in connection for passenger compartment and engine wiring harness
Cable termination terminal 87 M2e
Engines 271, 272.98, 274.9, 276 and engine 651 (except 4MATIC system):
Radiator shutter actuator
Engines 157, 271, 272, 273, 274, 276, 278:
Electrical plug-in connection for passenger compartment and engine wiring harness
Engines 642, 651:
CDI control unit
Electrical plug-in connection for passenger compartment and engine wiring harness
2320A On vehicles with a diesel engine:
SAM control unit with fuse and relay module in the rear
Engines 271, 642, 651:
Cable termination terminal 87 M1e
Engines 156, 157, 271, 272, 273, 274, 276, 278, 642, 651:
Electrical plug-in connection for passenger compartment and engine wiring harness
Engine 271:
ME control unit
2415A Engines 156, 157, 271, 272, 273, 274, 276, 278, 642, 651:
Electrical plug-in connection for passenger compartment and engine wiring harness
On vehicles with a diesel engine:
CDI control unit
For vehicles with petrol engine:
ME control unit
Engines 271.958, 274.920
CNG control unit
2515A Engines 642, 651:
Nitrogen oxide control unit after particulate filter
Nitrogen oxide control unit after SCR catalytic converter
Soot sensor control unit
For vehicles with petrol engine:
ME control unit
Valid for vehicle type 212.095/098/298:
Relay for the circulation pump of the gearbox oil cooling system
HYBRID Power Electronics Coolant Circulation Pump Relay
Engine 156:
Cable termination terminal 87 M3e
2620A Audio module
Audio module with Auto-Pilot system
COMAND control module
277.5A Electronic ignition lock control unit
On vehicles with a diesel engine:
CDI control unit
For vehicles with petrol engine:
ME control unit
Engines 271.958, 274.920
CNG control unit
287.5A Instrument cluster
2910A Front right headlight (until 02/28/2013)
3010A Front left headlight (until 02/28/2013)
31A15A Left horn
Right horn
31B15A Left horn
Right horn
32Electric air pump
3310A Control unit for automatic transmission electronic control system (gearbox 722.6)
10A Fully integrated automatic transmission control unit (gearboxes 722.9, 724, 725)
347.5A Engine 156:
Fuel pump control unit
Engines 271, 272, 273, 642, 651:
Fuel pump control unit
357,5A Power supply relay for HYBRID control units
367.5A Night vision control unit
Electric control module DISTRONIC (until 02/28/2013)
Far-field radar sensor, front (as of 03/01/2013)
COLLISION PREVENTION ASSIST control module (from 03/01/2013)
Relay
JRelay terminal 15
KRelay terminal 15R
LWiper heater relay
MTerminal 50 relay, starter
NTerminal 87 relay, motor
OHorn relay
PCatalyst purge relay (272 engines)
QAuxiliary transmission oil pump relay
RTerminal 87 relay, running gear

Power fuse box

Installed on the right side, next to the rack.

Photo

Type 1

Diagram for models without “ECO Start-Stop”

Type 1

Decoding

MR8Pyro-fuse, triggered by Supplemental Restraint System control unit
MR150A Electric power steering control unit
MR2Reserve
MR3Reserve
MR4100A Combustion engine fan motor and air conditioner with integrated control (650W, 800W)
MR5150A On vehicles with a diesel engine:
Additional electric heater
MR660A Front SAM control box with fuse and relay module
MR7150A Front SAM control box with fuse and relay module
PIN150A Fan regulator (left-hand drive vehicles)
Signals from the ESP control unit (right-hand drive vehicles)
ESP Premium electronic motion stabilization control unit (right-hand drive vehicles)
PIN250A Signals from the ESP control unit (right-hand drive vehicles)
ESP Premium electronic motion stabilization control unit (right-hand drive vehicles)
PIN360A Relay AIRMATIC
Fully Integrated Transmission Control Module (725 Transmission)
MRG1Reserve
MRG2100A Front SAM control box with fuse and relay module
IG1150A SAM control unit with fuse and relay module in the rear
I1100A SAM control unit with fuse and relay module in the rear

Type 2

Diagram for models with “ECO Start-Stop”

Type 2

Assignment

R8350A Generator
Autonomous heater control unit
MR4100A Combustion engine fan motor air conditioner with built-in regulation (650W, 800W)
MR5150A On vehicles with a diesel engine:
Additional electric heater
MR660A Front SAM control box with fuse and relay module
MR7150A Front SAM control box with fuse and relay module
MR9Reserve
MG2100A Front SAM control box with fuse and relay module
MR380A Electric power steering control unit
IG1150A SAM control unit with fuse and relay module in the rear
IM1100A SAM control unit with fuse and relay module in the rear
PIN150A Fan regulator (left-hand drive vehicles)
Signals from the ESP control unit (right-hand drive vehicles)
ESP Premium electronic motion stabilization control unit (right-hand drive vehicles)
PIN250A Signals from the ESP control unit (right-hand drive vehicles)
ESP Premium electronic motion stabilization control unit (right-hand drive vehicles)
PIN360A Relay AIRMATIC
Fully Integrated Transmission Control Module (725 Transmission)

Type 3

Diagram for models “Hybrid”

Type 3

Designation

MR8Pyro-fuse, triggered by Supplemental Restraint System control unit
MR4100A Combustion engine fan motor air conditioner with built-in regulation (650W, 800W)
MR5150A On vehicles with a diesel engine:
Additional electric heater
MR660A Front SAM control box with fuse and relay module
MR7150A Front SAM control box with fuse and relay module
MR9150A Fuse and relay module HYBRID
MG2100A Front SAM control box with fuse and relay module
MR380A Electric power steering control unit
IG1150A SAM control unit with fuse and relay module in the rear
IM1100A SAM control unit with fuse and relay module in the rear
PIN150A Fan regulator (left-hand drive vehicles)
Regenerative brake system control unit (right-hand drive vehicles)
PIN250A Regenerative brake system control unit (right-hand drive vehicles)
PIN360A Relay AIRMATIC

Luggage compartment

Fuse and relay box

Installed on the right side behind the side protection.

Photo 4

Diagram

Diagram 4

Allocation

377,5A Solenoid coil, driver seat NECK-PRO headrest
Solenoid Coil, Passenger Seat NECK-PRO Headrest
3815A Tailgate wiper motor
3930A Rear left door control unit (until 05/31/2010)
Front left door control unit (from 06/01/2010; RHD)
40Reserve
4130A Rear right door control unit (until 05/31/2010)
Front right door control unit (from 06/01/2010; LHD)
4225A Electric fuel pump relay
25A Engines 156, 276, 278:
Fuel pump control unit
Engines 271, 272, 273, 274, 642, 651:
Fuel pump control unit
437.5A Telecom Services Communication Module
4430A Switch for partially electric seat adjustment, front passenger
4530A Driver’s seat partially electric adjustment switch
467.5A Antenna amplifier FM 1, AM, ZV and KEYLESS-GO
Valid for type 212.0/1:
Antenna amplifier 1 rear window
Valid for type 212.2:
DAB III band antenna
Alarm Siren (H3/1)
Control unit for interior monitor and towing protection
Valid from 06/01/2011 for engine 157, 276, 278:
Coolant circulation pump relay
47Reserve
48Reserve
4940A The rear window heating relay switches on: Rear window heating
5050A Front right seat belt reversible pretensioner
5150A Front left reversible seat belt pretensioner
52Reserve
5330A Trailer detection control unit
5415A Trailer detection control unit
55Reserve
5615A Trailer socket
5720A Trailer detection control unit
7.5A Valid for type 212.074/075/076/077/092/274/275/276/277/292:
Illuminated treadplate transformer front left
Illuminated treadplate transformer front right
5825A Trailer detection control unit
597,5A DiStRONIC sensor (DTR) front bumper left
DISTRONIC sensor (dTr) front bumper right
607.5A Air pump for multicontour seat
30A Air pump for multi-contour seat with dynamic support
6140A Trunk lid actuator control unit
Tailgate control system control unit
6225A Driver seat control unit
6325A Seat heating control unit, rear
6425A Front passenger seat control unit
657.5A Steering wheel heating control unit (up to 02/28/2013)
10A Steering column electronic module control unit (from 03/01/2013)
667.5A Rear blower motor
6740A Speaker amplifier control unit
6815A AIRMATIC control unit
15A Control unit for electronic vehicle level control on the rear axle
6925A Rear subwoofer amplifier
705A Tire pressure monitoring control unit
7115A Socket in front of passenger compartment
Cigarette lighter with illuminated ashtray in front
7215A Socket in trunk
735A Diagnostic socket
Remote radio remote control receiver for auxiliary heater
Driving modes control unit (gearbox 722.930/931)
7415A KEYLESS-GO control unit
Valid from 01.03.2013 with code 641 (Dynamic LED headlights for left-hand traffic) or code 642 (Dynamic LED headlights for right-hand traffic):
Front right headlight
Valid with code 631 (LED headlights, static for left-hand traffic) or code 632 (LED headlights, static for right-hand traffic):
Front left headlight (from 03/01/2013)
Front right headlight
DC/AC converter control unit (from 12/01/2011)
7520A Auxiliary heater heater
25A Oil cooler fan motor relay (156 engines:)
20A Valid from 03/01/2013 with code 641 (Dynamic LED headlights for left-hand traffic) or code 642 (Dynamic LED headlights for right-hand traffic):
Front left headlight
Valid from 03/01/2013 with code 631 (Static LED headlights for left-hand traffic) or code 632 (Static LED headlights for right-hand traffic):
Front left headlight
Front right headlight
7615A Rear cup holder
Center console socket in the rear
Electrical USB connection at the rear of the vehicle
777.5A Weight Sensing System control unit (up to 02/28/2013)
Navigation computer (China, Korea)
Rear cup holder
787.5A Media Interface control unit
Media Connectivity Module
795A Radar sensors control unit (until 05/31/2010)
Control unit for video sensors and radar sensors (from 06/01/2010)
Chassis data bus interface control unit (as of 03/01/2013)
805A Parking assistance control unit
815A Antenna Amplifier / Mobile Phone Compensator
Mobile phone electrical plug
Navigation computer (China, Korea)
8210A Front left seat ventilation fan control
Front Right Seat Ventilation Fan Regulator
837.5A Terminal 15R cable termination
Navigation computer (China, Korea)
Emergency call control unit
Control unit “Electronic Toll Collection” (Japan)
845A Rear view camera (from 01.03.2013)
360° camera control unit (from 03/01/2013)
SDAR/High Definition Tuner Control Unit (SIRIUS Satellite Radio) (until 05/31/2010)
Satellite Digital Audio Radio (SDAR) control unit (SIRIUS satellite radio) (from 06/01/2010)
Digital audio broadcasting control unit (Digital radio (DAB)
Rear view camera control unit (Japan)
Rear View Camera Power Module (Japan)
857.5A TV tuner (analog/digital) (until 02/28/2015)
Digital TV tuner (until 02/28/2015)
Tuner module (from 03/01/2015)
867.5A DVD player
Rear left display
Rear right display
877.5A Emergency call system control unit
Coolant circulation pump relay (as of 06/01/2011; USA)
Communication module of telecommunication services (from 01.03.2015)
Multifunction control unit for special vehicle (N26/14)
8815A Automatic transmission servo drive module for DIRECT SELECT system (gearbox 722.9)
8930A Trailer detection control unit
Special vehicle multifunction control unit (MSS)
Fuel pump control unit (up to 02/28/2013; engine 157)
Valid from 03/01/2013 with code 632 (LED static headlights for right-hand traffic) and code 494 (US version):
Front right headlight
Valid from 03/01/2013 with code 642 (SAE dynamic LED headlights for right-hand traffic) and code 494 (US version):
Front left headlight
Front right headlight
9040A AdBlue® fuse box (engine 642.8)
Valid for type 212.076/276:
Coolant circulation pump relay
9110A Front SAM control unit with fuse and relay module (transmission 722)
9215A KEYLESS-GO control unit
Module for keyless opening of the trunk lid under the rear bumper (from 03/01/2013)
AC/DC converter control unit (until 11/30/2011)
Relay
ARelay terminal 15
BRelay terminal 15R (1)
CHeated rear window relay
DOn vehicles with a diesel engine:
Fuel pump relay
ETailgate Wiper Relay
FSeat adjustment relay
GRelay terminal 15R (2)

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

Appointment

  • F170 – Reserve
  • F171 – 60A Front SAM control unit with fuse and relay module
  • F172 – 100A SAM control unit with fuse and relay module in the rear

Next to the AdBlue unit (if any), additional protection elements can be installed that are responsible for its operation.

Found a mistake or have something to add – write in the comments.

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