Mercedes W245 is a series of compact B-class cars of the German brand Mercedes-Benz, which was produced in 2005, 2006, 2007, 2008, 2009, 2010 and 2011 with the designation B160, B170, B180, B200. During this time, the model has undergone restyling. In this publication, we will provide information about the location of all electronic control units, a description of fuses and relays of the Mercedes w245 with block diagrams and photo examples of their execution. We will highlight the fuse responsible for the cigarette lighter.
The design of the blocks and the location of the elements in them may differ from the one provided and depends on the year of manufacture and the level of electrical equipment of your car.
Arrangement
General layout of control units
Description
| 1 | ABS electronic control unit |
| 2 | Heater/Air Conditioner Fan Motor Resistor – In the Heater Unit |
| 3 | Air conditioner/heater control unit – behind the air conditioner/heater control panel |
| 4 | Air conditioning/heating humidity sensor – on the intake system resonator |
| 5 | Antenna unit 1 – on the ceiling panel |
| 6 | Antenna unit 2 – on the ceiling panel |
| 7 | Side impact sensor, driver’s side – in the center pillar |
| 8 | Side impact sensor, passenger side – in the center pillar |
| 9 | Anti-theft system control unit – behind the front interior lighting lamp |
| 10 | Anti-theft system siren – on the intake system resonator |
| 11 | Sunlight sensor |
| 12 | Audio system amplifier – behind the right rear side trim panel |
| 13 | Auxiliary heater control unit – in the air conditioner/heater control panel |
| 14 | Battery – legroom |
| 15 | CAN data bus, gateway control unit, audio system – behind the right rear side trim panel |
| 16 | CAN data bus, gateway control unit – behind the instrument panel |
| 17 | Compass control unit – by instrument cluster |
| 18 | Diagnostic Connector (DLC) |
| 19 | Driver’s door electrical control unit – in the door |
| 20 | Left rear door electrical control unit – in the door |
| 21 | Right rear door electrical control unit – in the door |
| 22 | Passenger door electrical control unit – in the door |
| 23 | Electronic engine control unit-Diesel |
| 24 | Electronic engine control unit – gasoline |
| 25 | Fuse/relay block, instrument panel |
| 26 | Fuse/relay block, footwell |
| 27 | Xenon headlight control unit, left – Under the left headlight |
| 28 | Xenon headlight control unit, right – Under the right headlight |
| 29 | Headlight leveling motor, left |
| 30 | Headlight leveling motor, right |
| 31 | Sound signal |
| 32 | Ignition lock control unit |
| 33 | Electronic immobilizer control unit – in the ignition lock control unit |
| 34 | Immobilizer ring antenna – ignition switch |
| 35 | Electronic control unit of the gas cylinder supply system |
| 36 | Multifunction control unit – functions: Low brake fluid level sensor, central locking, coolant level sensor, exterior lights, interior lights, hazard warning lights, turn signals, rear window heater, horn, reversing light switch, windshield wiper/washer, rear window wiper/washer |
| 37 | Multimedia control unit |
| 38 | Multifunction switch control unit |
| 39 | Navigation system control unit – in the audio system unit |
| 40 | Ambient air temperature sensor – behind the bumper |
| 41 | Parking system control unit – behind the right rear side trim panel |
| 42 | Power steering control unit – on the steering rack |
| 43 | Rain sensor – upper center of windshield |
| 44 | Steering column electrical control unit – under the steering wheel |
| 45 | Steering column lock control unit – on the steering column |
| 46 | Subwoofer – behind the left rear side trim panel |
| 47 | SRS electronic control unit – under the center console |
| 48 | Phone interface control unit – under the seat |
| 49 | Trailer electrical control unit – behind the right rear side trim panel |
| 50 | Electronic gearbox control unit – in the gearbox |
| 51 | Gear shift control unit – selector |
Fuse block
The main fuse box is located next to the battery in the front passenger footwell. The floor covering must be removed to access it.
Marking
| F1 | 10A Dorestyling: Brake light switch |
| 5A Restyling and restyling with code U58 (exterior lighting package): Brake light switch | |
| F2 | 25A Heated rear window |
| F3 | 7.5A Instrument cluster |
| EZS control unit | |
| F4 | 15A EZS control unit |
| Electric steering lock control unit | |
| F5 | 7.5A HAU control panel |
| KLA control panel (automatic air conditioning system) | |
| F6 | 15A Left horn |
| Right beep | |
| F7 | 25A Fuel pump with fuel level sensor |
| F8 | 25A Ceiling control panel |
| F9 | 40A ESP and BAS system control unit |
| F10 | 40A Fan Motor |
| F11 | 30A Engines 266: Relay for electrical circuit terminal 87, engine |
| 40A Engines 640: Relay electrical circuit terminal 87, engine | |
| F12 | 5A Electronic steering column module |
| Multifunction steering wheel | |
| F13 | 25A Front left door control unit |
| F14 | 25A Front right door control unit |
| F15 | 25A ESP and BAS system control unit |
| F16 | 10A Diagnostic connector |
| PTS control unit (parking sensors, pre-styling) | |
| F17 | 5A Outdoor Light Rotary Switch |
| F18 | 7.5A Transmission 711, 716: Reverse signal switch |
| F19 | 5A Micromechanical Angular Velocity Sensor AY |
| F20 | 7.5A Passive safety system control unit |
| F21 | 30A Starter |
| F22 | 7.5A Instrument cluster |
| F23 | 20A Engines 640 (from 1.9.08): Fuel filter condensate sensor with heating element |
| 7.5A Pre-styling: Washer nozzle heating | |
| F24 | 7.5A Electric power steering control unit (ES) |
| F25 | 7.5A Brake signal switch |
| ESP and BAS system control unit | |
| F26 | 7.5A Transmission 722: Electronic selector lever module control unit |
| F27 | 10A Transmission 722: CVT (Continuously Variable Transmission) Electric Control Module |
| F28 | 5A Outdoor Light Rotary Switch |
| F29 | 30A SAM control unit |
| F30 | 25A Relay electrical circuit terminal 87F |
| F31 | 5A Outdoor Light Rotary Switch |
| Central interface control unit (vehicles before 30.11.05) | |
| F32 | 7.5A Engines 266: ME control unit |
| F33 | 15A Audio system |
| Audio module and navigation unit | |
| COMAND control and display unit | |
| F34 | 25A Rear left door control unit |
| F35 | 25A Rear right door control unit |
| F36 | 10A Restyling: PTS control unit (parking system) |
| Trailer control unit | |
| 7.5A Dorestyling: Trailer control unit | |
| Mobile phone circuit connector | |
| F37 | 7.5A Passive safety system control unit |
| Passenger/child seat detection sensor on the front passenger seat | |
| Front passenger seat occupancy recognition system | |
| F38 | 25A Cigarette lighter with light, front |
| F39 | 25A Wiper motor |
| F40 | 25A Sectional roof: Ceiling control panel (sunroof motor) |
| 7.5A Ceiling control panel | |
| F41 | 15A Tailgate wiper motor |
| F42 | 7.5A Glove box lighting with microswitch |
| Cosmetic mirror lighting on the left and right | |
| Pedal pressure control sensor (driving school package) | |
| Footwell lighting switch (driving school package) | |
| VICS+ETC power supply connector (Japan) | |
| Emergency call system control unit (USA) | |
| F43 | 7.5A Engines 266: Cable lug electrical circuit terminal 87M1e |
| 15A Engines 640: Cable lug electrical circuit terminal 87M1e | |
| Dual-fuel LPG engine: Cable lug electrical circuit terminal 87M1e | |
| F44 | 15A Engines 266: Cable lug electrical circuit terminal 87M2e |
| 20A Engines 640: Cable lug electrical circuit terminal 87M2e | |
| F45 | 25A 640 Engines: CDI System Control Unit |
| F46 | 25A Woofer (Japan, Restyling) |
| 40A Speaker system amplifier (restyling) | |
| 7.5A UHI control unit (universal mobile phone interface) (pre-styling) | |
| GSM 1800 network compensator (pre-styling) | |
| Phone control unit (Japan, pre-styling) | |
| F47 | 7.5A Mobile phone circuit connector |
| UHI (Universal Mobile Phone Interface) control unit | |
| Voice control system control unit (pre-restyling) | |
| Phone control unit (Japan, pre-styling) | |
| F48 | 7.5A EDW/towing protection/interior protection system control unit |
| Alarm siren | |
| F49 | 25A Top control panel |
| Front left seat cushion heating element (pre-styling) | |
| Front left seat backrest heating element (pre-styling) | |
| Front right seat cushion heating element (pre-styling) | |
| Front right seat backrest heating element (pre-styling) | |
| F50 | 7.5A Multimedia interface control unit (restyling) |
| Digital TV tuner (restyling) | |
| Digital audio broadcasting system control unit (restyling) | |
| CD changer (pre-styling) | |
| Detachable VICS+ETC power supply connection (Japan, pre-styling) | |
| 30A Company cars: Roof beam | |
| Cable lug electrical circuit terminal 30 | |
| F51 | 10A Passenger Weight Sensing System (WSS) Control Unit (Canada) |
| Special signal system control panel (official vehicles) | |
| F52 | 7.5A Emergency call system control unit (vehicles before 31.5.06) |
| 5A VICS+ETC power supply connector (Japan, vehicles before 31.5.06) | |
| F53 | 30A Interior socket |
| Cigar lighter with ashtray light, rear | |
| F54 | 15A Company cars: 2-pole socket 12V |
| 25A Speaker system amplifier (pre-styling) | |
| Woofer (pre-styling) | |
| F55 | 7.5A Pre-styling and restyling with code 614: |
| Front left headlight | |
| Front right headlight | |
| 10A Restyling: Front left headlight | |
| F56 | 10A Restyling: Front right block headlight |
| F57 | 15A AHV towbar connector, 13-pin (restyling) |
| 20A Audio interface control unit (Japan. Pre-styling) | |
| 7.5A Emergency call system control unit | |
| SDAR control unit | |
| F58 | 25A Trailer control unit |
| F59 | 20A AHV towbar plug, 13-pin |
| Trailer control unit (vehicles before 31.5.05) | |
| F60 | 20A Driver’s seat contact strip |
| F61 | 20A Front passenger seat contact strip |
| F62 | 40A Restyling: Relay of electrical circuits terminal 15 (2) (additional equipment: xenon headlights, mobile phone) |
| 25A Dorestyling: Relay of electrical circuit terminal 15 (2) (additional equipment: xenon headlights, mobile phone) | |
| F63 | 7.5A SDAR control unit (Canada) |
| 25A Roof beam (company cars) | |
| F64 | 40A Engines 266: Air Pump Relay |
| 80A Engines 640: Glow plug end time | |
| F65 | 80A Electric power steering control unit (ES) |
| F66 | 60A SAM control unit |
| F67 | 50A Relay electrical circuit terminals 15R (2) (optional equipment) |
| F68 | 50A Standard equipment (restyling): Electric suction fan for the engine and air conditioning with integrated regulator (Pre-styling: (valid for engine 266.920 and 266.940 with KP 722)) |
| 60A Special equipment (restyling): Pre-styling: (valid for engines 640.940, 640.941, 266.960, 266.980 and for engines 266.920, 266.940 with code (550)) | |
| F69 | 50A Relay electrical circuit terminal 15R (1) |
| F70 | 60A Relay electrical circuit terminal 15 (1) |
| F71 | 150A Motors 640: PTC auxiliary heater |
| F72 | 60A Dorestyling: Cable lug electrical circuit terminal 30 |
| Company cars: | |
| Fuse 7 (F7f7) | |
| Fuse 10 (F7f10) | |
| Taxi: | |
| Multifunctional control unit of a special vehicle (MSS) |
Fuses 38 and 53 are responsible for the operation of the cigarette lighters.
Relay block
There is a relay block under the dashboard at the front passenger’s feet. To access it, you need to remove the interior trim. The glove compartment does not need to be removed.
Appointment
| Fuses | |
| 80 | 30A Taxi, service, rental cars: Multifunctional special vehicle control unit (MSS) |
| 81 | 30A Taxi, service, rental cars: Multifunctional special vehicle control unit (MSS) |
| 82 | 30A Taxi, service, rental cars: Multifunctional special vehicle control unit (MSS) |
| 83 | 30A Taxi, service, rental cars: Multifunctional special vehicle control unit (MSS) |
| Relay | |
| A | Relay electrical circuit terminals 15R (2) |
| B | Relay electrical circuit terminals 15R (1) |
| C | Audible signal relay |
| D | Rear window heating relay |
| E | Scum cleaner relay, mode 1/2 |
| F | Wiper relay ON/OFF |
| G | Relay electrical circuit terminal 15 (1) |
| H | Backup relay |
| I | Air pump relay |
| K | Fuel pump relay |
| L | Relay electrical circuit terminal 87, engine |
| M | Starter relay |
| N | Relay electrical circuit terminal 87F |
| O | Relay electrical circuit terminals 15 (2) |