Mercedes-Benz R-Class (W251) (2006-2012) Fuse Diagram

Fuse box diagram (fuse layout), location, and assignment of fuses and relays Mercedes-Benz R-Class (W251) (R280, R300, R320, R350, R400, R500, R63 AMG) (2006, 2007, 2008, 2009, 2010, 2011, 2012).

Mercedes-Benz R-Class (W251) (2006-2012)

Checking and Replacing Fuses

The fuses in your vehicle serve to close down faulty circuits. If a fuse blows, all the components on the circuit and their functions stop operating. If a fuse has blown, the inside element will be melted. Blown fuses must be replaced with fuses of the same rating, which you can recognize by the color and value. The fuse ratings are listed in the fuse allocation chart (located in the vehicle tool kit in the stowage compartment under the trunk floor).

If a newly inserted fuse also blows, have the cause traced and rectified at a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center.

Notice

  • Before changing a fuse, secure the vehicle against rolling away and switch off all electrical consumers.
  • Always disconnect the battery before servicing high current fuses.
  • Always replace faulty fuses with the specified new fuses having the correct amperage. If you manipulate or bridge a faulty fuse or if you replace it with a fuse with a higher amperage, the electric cables could be overloaded. This could result in a fire. There is a risk of an accident and injury.
  • Only use fuses that have been approved for Mercedes-Benz vehicles and which have the correct fuse rating for the system concerned. Otherwise, components or systems could be damaged.

Location

Location of the fuses

  • F3 – Cockpit fuse box
  • F4 – Load compartment fuse and relay
  • F32 – Front prefuse
  • F33 – Battery compartment prefuse box box
  • F58 – Engine compartment fuse and relay

Passenger Compartment Fuse Box

The fuse panel is located on the front passenger side of the dashboard.

Passenger Compartment Fuse Box Location

To open:

  1. Open the front passenger door.
  2. Pull cover (1) in the direction of the arrow.

To close:

  1. Clip upper end of cover (1) into the opening.
  2. Push on the lower end of cover (1) until it engages.

Passenger Compartment Fuse Box Diagram

Fused functionA
10Booster blower electronic blower controller10
11Instrument cluster5
12Automatic air conditioning [KLA] control and operating unit15
Comfort automatic air conditioning [KLA] control and operating unit
13Upper control panel control unit5
Steering column module
14CD changer (up to 2008)7.5
EZS control unit
15Electronic compass5
Media interface control unit (as of 2009)
16--
17--
18--

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Battery Compartment Prefuse Box

It is located near the battery under the front passenger’s seat.

Battery Compartment Prefuse Box Diagram

Fused functionA
78Diesel engine: Heater booster control unit150
79Rear SAM control unit60
80Rear SAM control unit60
81as of 2009:40
   Valid for engine 642.870: AdBlue® supply relay
   Valid with engine 276: Engine compartment fuse and relay box
82up to 2008: Load compartment fuse and relay box150
as of 2009: Load compartment fuse and relay box100
83USA version: WSS (Weight Sensing System) control unit5
84Restraint systems control unit10
85as of 2009: DC/AC converter control unit (115 V socket)25
86Cockpit fuse box30
87-30
88up to 2008: Front SAM control unit70
as of 2009: Front SAM control unit40
89Front SAM control unit70
90Front SAM control unit70
91Blower regulator40

Engine Compartment Fuse Box

It is on the right-hand side of the vehicle, when viewed in the direction of travel.

Engine Compartment Fuse Box Location

To open:

  1. Open the hood.
  2. With a dry cloth, remove any moisture from the fuse box (1).
  3. Pull clamp (1) in direction of arrow.
  4. Lift fuse box cover (2) up.

To close:

  1. Make sure the sealing rubber is positioned properly.
  2. Press fuse box cover (2) down and secure with clamp (1).
  3. Close the hood after checking or replacing fuses.

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Engine Compartment Fuse Box Diagram

Fused functionA
100Wiper motor30
101up to 2008:15
   AAC with integrated control additional fan motor
   Valid for engines 113, 272: Purge control valve
  Valid for engine 272:
      Radio interference suppression capacitor 1
      Radio interference suppression capacitor 2
      Cylinder 1 ignition coil
      Cylinder 2 ignition coil
      Cylinder 3 ignition coil
      Cylinder 4 ignition coil
      Cylinder 5 ignition coil
      Cylinder 6 ignition coil
   Valid for engine 642:
      O2 sensor upstream of CAT
      CDI control unit
as of 2009:
   Engine and air conditioning electric suction fan with integrated control
   Valid for engine 272, 273:
      Purging switchover
      Circuit 87 M1e connector sleeve
   Valid with engine 642:
      CDI control unit
      O2 sensor upstream of CAT
   Valid for engine 642.870/872:
      O2 sensor upstream of CAT
102up to 2008:15
   Valid for engine 642:
      Recirculation pump for transmission oil cooler
  Valid for engine 156:
      Engine coolant circulation pump
as of 2009:
   Valid for engine 642, engine 642.870 up to 31.7.10:
      Transmission cooler circulation pump
   Valid with engine 276:
      Charge air cooler circulation pump
103up to 2008:25
   Valid for engine 113:
      ME-SFI [ME] control unit
      Cylinder 1 fuel injection valve
      Cylinder 2 fuel injection valve
      Cylinder 3 fuel injection valve
      Cylinder 4 fuel injection valve
      Cylinder 5 fuel injection valve
      Cylinder 6 fuel injection valve
      Cylinder 7 fuel injection valve
      Cylinder 8 fuel injection valve
    Valid for engine 642:
      CDI control unit
as of 2009:
   Valid for engine 642.950, 642.870/872: CDI control unit
   Valid for engine 272: ME-SFI [ME] control unit
   Valid with engine 276:
      ME-SFI [ME] control unit
      Engine/engine compartment connector
104up to 2008:15
   Valid for engine 113:
      Left O2 sensor upstream TWC [KAT]
      Right oxygen O2 sensor upstream of catalytic converter
      Left O2 sensor downstream TWC [KAT]
      Right O2 sensor downstream TWC [KAT]
      Variable intake manifold switchover valve
      EGR vacuum transducer
      Air pump change-over valve
  Valid for engine 272:
      Heating system shutoff valve
      Intake manifold tumble flap switchover valve
      Air pump change-over valve
      Three-disk thermostat valve
      Pressure regulating on the valve power steering unit pump
   Valid for engine 642:
      Left hot film mass air flow sensor
      Right hot film mass air flow sensor
      Intake port shutoff motor
      Glow time output stage
      Vent line heater element
      Power steering pump pressure regulator valve
      Left exhaust gas recirculation positioner
      Boost pressure positioner
as of 2009:
   Valid for engine 272, 273: Connector sleeve, circuit 87 M2e
   Valid for engine 642.950: Circuit 87 connector sleeve
   Valid for engine 642.870/872: Circuit 87D2 connector sleeve
105up to 2008:15
   Valid for engine 113:
      ME control unit
      Radio interference suppression capacitor 1
      Radio interference suppression capacitor 2
      Cylinder 1 ignition coil
      Cylinder 2 ignition coil
      Cylinder 3 ignition coil
      Cylinder 4 ignition coil
      Cylinder 5 ignition coil
      Cylinder 6 ignition coil
      Cylinder 7 ignition coil
      Cylinder 8 ignition coil
   Valid for engine 272:
      ME control unit
      Hot film mass air flow sensor
      Hall sensor for left inlet camshaft
      Right intake camshaft Hall sensor
      Left exhaust camshaft Hall sensor
      Right exhaust camshaft Hall sensor
      Left intake camshaft solenoid
      Right camshaft intake solenoid
      Left exhaust camshaft solenoid
      Right exhaust camshaft solenoid
      Cylinder 1 fuel injection valve
      Cylinder 2 fuel injection valve
      Cylinder 3 fuel injection valve
      Cylinder 4 fuel injection valve
      Cylinder 5 fuel injection valve
      Cylinder 6 fuel injection valve
   Valid for engine 642: CDI control unit
as of 2009:
   Valid for engine 272, 273:
      ME-SFI [ME] control unit
      Circuit 87 M1i connector sleeve
   Valid with engine 276: Engine/engine compartment connector
   Valid for engine 642.950:
      CDI 1.0 PK control unit
      Engine compartment/interior compartment connector
   Valid for engine 642.870/872:
      CDI control unit
      Engine compartment/interior compartment connector
      Circuit 87 connector sleeve
106--
107Valid for engine 113, 272, 273: Electric air pump40
108AIRmatic compressor unit40
109ESP control unit25
110Alarm signal horn with additional batteryAlarm siren10
111Intelligent servo module for DIRECT SELECT30
112Left front lamp unit7.5
Right front lamp unit
113Left fanfare horn15
Right fanfare horn
114up to 2008:5
   Front SAM control unit
   Valid for engine 272: ME control unit
as of 2009: Front SAM control unit
115ESP control unit5
116Electric controller unit (VGS)7.5
117Distronic (DTR) controller unit7.5
118Valid for engine 272, 273, 276: ME control unit5
Valid for engine 642: CDI control unit
119Valid for engine 642.870/872: CDI control unit5
120up to 2008:10
   Valid for engine 113, 272: ME control unit
   Valid for engine 642: CDI control unit
as of 2009:
   Valid for engine 272, 273, 276:
      Engine circuit 87 relay
      ME-SFI [ME] control unit
   Valid with engine 642: Engine circuit 87 relay
121STH heater unit20
122Valid for engine 113, 272, 273, 276, 642: Starter25
123Valid for diesel engine as of 1.9.08: Fuel filter condensation sensor with heating element20
124as of 2009: Electrohydraulic power steering7.5
125--
Relays
AWiper stage 1 and 2 relay
BWiper ON / OFF
CValid for engine 642: Additional circulation pump for transmission oil cooling
Valid for engine 156: Engine coolant circulation pump
DTerminal 87 engine
ESecondary air injection pump
FHorn
GAir suspension compressor
HCircuit 15
IStarter

Front Prefuse Box

Front Prefuse Box

Fused functionA
4--
5Valid as of 1.7.09: ESP control unit40
6Valid up to 30.6.09: ESP control unit40
Valid as of 1.7.09: Electrohydraulic power steering100
7AAC with integrated control additional fan motor100
8Engine compartment fuse and relay box150

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Luggage Compartment Fuse Box

The fuse block is placed in the stowage well under the trunk floor.

Luggage Compartment Fuse Box Location

To open:

  1. Open the cargo compartment.
  2. Lift the cargo compartment cover.
  3. Secure cargo compartment cover with securing hook.
  4. Fold cover 1 to the left as indicated by the arrow.

To close:

  • Install cover 1 in reverse order.

Luggage Compartment Fuse Box Diagram

Fused functionA
20Interference suppression filter for radio antenna5
Microphone array control unit (up to 2008; except Japan version)
Voice control system (VCS [SBS]) control unit (up to 2008; USA version)
21RCP [HBF] control unit5
22Parktronic system (PTS) control unit5
Stationary heater (STH) radio remote control receiver (as of 2009)
23DVD player (rear entertainment system)10
E-net compensator
Rear audio control unit (up to 2008)
Portable CTEL separation point (up to 2008; Japan version)
Universal Portable CTEL Interface (UPCI [UHI]) control unit (up to 2008; Japan version)
COMAND operating, display and controller unit (as of 2009)
24Right front reversible emergency tensioning retractor40
25up to 2008:15
   Radio (except USA version and Japan version)
   Radio and navigation unit (except USA version and Japan version)
   COMAND operating, display and controller unit
as of 2009:20
   Radio
   Radio and navigation unit
   COMAND operating, display and controller unit
26Right front door control unit25
27Front passenger seat adjustment comfort relay (up to 2008)30
Passenger-side front seat adjustment control unit with memory
28Driver seat adjustment comfort relay (up to 2008)30
Driver-side front seat adjustment control unit, with memory
29Left front reversible emergency tensioning retractor40
30up to 2008:40
   Valid for engine 156:
      Left fuel pump control unit
      Right fuel pump control unit
as of 2009: Fuel system control unit
31HS [SIH], seat ventilation and steering wheel heater control unit10
32AIRmatic with ADS control unit15
Rear axle level control system control unit
33Keyless Go control unit25
34Left front door control unit25
35Amplifier for sound system30
Subwoofer amplifier (as of 2009)
36up to 2008: Emergency call system control unit5
up to 2008:10
   Japan version:
      VICS+ETC voltage supply separation point
as of 2009: Emergency call system control unit
37Backup camera voltage supply module (as of 01.06.2006, except USA version and Japan version)5
Backup camera control unit (as of 01.06.2006, Japan version)
38Audio gateway control unit (up to 2008; Japan version)10
Digital TV tuner
TV combination tuner (analog/digital)
39up to 2008:7.5
   SDAR control unit (USA version)
   Tire pressure monitor (TPM) [RDK] control unit
as of 2009:
   Tire pressure monitor (TPM) [RDK] control unit
   High definition tuner control unit
   Digital Audio Broadcasting control unit
   External navigation separating point (South Korea version)
40up to 2008: Rear-end door closing control unit40
as of 2009: Rear-end door closing control unit30
41Overhead control panel control unit25
42Overhead control panel control unit25
43Up to 31.05.2006:20
   Tailgate wiper motor
   Left 3rd seat row socket
   Right 3rd seat row socket
as of 2009:
   Valid for engine 272, 273, 276: Fuel system control unit
   Valid for engine 642.872: Right fuel system control unit
44Up to 31.05.2006:20
   Left 2nd seat row socket
   Right 2nd seat row socket
as of 2009:
   USA version:
      Front interior socket
      115 V socket
45up to 2008:20
   Cargo area connector box
   up to 31.05.2006:
      Front interior socket
   as of 01.06.2006:
      Left 2nd seat row socket
      Right 2nd seat row socket
as of 2009:
   Right 2nd seat row socket
   Luggage compartment socket
46Front cigar lighter with ashtray illumination15
47as of 2009:10
   Valid for retrofit:
      Left front illuminated door sill molding
      Right front illuminated door sill molding
48as of 2009:5
   Valid for engine 642.870: AdBlue® supply relay
49Right antenna coil (up to 2008)30
Heated rear window
50up to 2008: Tailgate wiper motor10
as of 2009: Tailgate wiper motor15
51Activated charcoal filter shutoff valve5
52up to 30.6.09:  5
   Left front reversible emergency tensioning retractor
   Right front reversible emergency tensioning retractor
53AIRmatic with ADS control unit5
Rear axle level control system control unit
up to 2008:
   Valid for engine 156:
      Left fuel pump control unit
      Right fuel pump control unit
as of 2009:
   Valid for engine 272, 273, 276: Fuel system control unit
   Valid for engine 642.872: Right fuel system control unit
54Front SAM control unit5
Headlamp range adjustment control unit (bi-xenon headlamp unit)
55Rotary light switch7.5
Instrument cluster
56up to 2008: Data link connector5
as of 2009:
   Valid for engine 642.870: AdBlue® control unit
57up to 2008: Fuel pump with fuel gauge sensor20
as of 2009:
   Valid for engine 642.870: Fuel pump
58Data link connector7.5
Central gateway control unit
59Driver NECK-PRO head restraint solenoid7.5
Front passenger NECK-PRO head restraint solenoid
60up to 2008:5
   Glove compartment illumination with switch
   Rear SAM control unit
   Engine compartment fuse and relay box
   CTEL separation point
   VICS+ETC voltage supply separation point (Japan version)
   Emergency call system control unit
as of 2009:
   Glove box illumination with switch
   Engine compartment fuse and relay box
   Rear SAM control unit)
   Cell phone separation point
   VICS+ETC power supply separating point (Japan version)
   Multicontour seat pneumatic pump
   External navigation separating point (South Korea version)
   Emergency call system control unit
   Rear bumper interior Blind Spot Monitoring electrical connector
61Restraint systems control unit 10
Right front seat contacting strip
62Front passenger seat adjustment switch30
Front passenger lumbar support regulator control unit
63Driver seat adjustment switch30
Driver lumbar support regulator control unit
64--
65--
66as of 2009: Multicontour seat pneumatic pump30
67Rear air conditioning blower motor25
68up to 2008: Heated rear seats25
as of 2009: Seat heater, seat ventilation and steering wheel heater control unit
69-30
70Trailer hitch socket (13-pin)20
Trailer hitch socket (7-pin) (USA version)
71USA version: Electric brake control separation point30
72Trailer hitch socket (13-pin)15
Relays
Kto 31.05.2006: Terminal 15R power outlet relay, with power-down
as of 01.06.2006: Relay, circuit 15R sockets (with power-down) (power supply of electric seat adjustment)
LTerminal 30X
MHeated rear window relay
NCircuit 15 relay / terminal 87FW
OFuel pump relay
PRear wiper relay
RCircuit R relay 15R
SReserve 1 (changer) (power supply for front socket)
Tas of 01.06.2006: Reserve 2 (normally open contact) (power supply for center and rear sockets)
Uas of 01.06.2006: Trailer relay terminal 30
Vas of 01.06.2006: Spare relay 2