Table of Contents
Mercedes-Benz W176 is a compact car of the German concern Daimler AG. Formally, it is considered a model of the 3rd generation of A-Class. But from the previous two generations it is distinguished by a much lower “sporty” body. In this material we will analyze in detail the fuse diagrams of Mercedes A-Class W176 (third generation; designations A180, A200, A250, A180, A200, A220) 2013, 2014, 2015, 2016, 2017, 2018 year of manufacture.
Here you will find the location and photos of distribution boxes. The fuses responsible for the “Cigarette lighter” and “Fuel Pump” are highlighted in bold.
In the engine compartment
There are two fuse boxes for the protection of the vehicle's electrical circuits.
Power fuse box (1)
Located on the side of the main fuse box.
General view.
| Diagram | ||
|---|---|---|
|
||
| № | Description | Amps |
| F32k1 | Decoupling relay (F32k1) | - |
| F1 | Generator | 300 |
| F2 | Fuse box in the passenger compartment (gasoline engines) | 200 |
| Fuse box in the passenger compartment (diesel engines) | 250 | |
| F3 | Electric power steering control unit | 100 |
| F4 | SAM control unit | 40 |
| F5 | Fan motor | 80 |
| F6 | Fuel heater control unit (607 engine) | 70 |
| F7 | DPF regeneration auxiliary heater control unit (607 engine) | 125 |
| F8 | Glow plug output stage module (engines: 651, 607) | 100 |
Main fuse box (2)
General view.
| Diagram | ||
|---|---|---|
|
||
| № | Description | Amps |
| J | Horn relay | - |
| K | Wiper speed relay 1/2 | - |
| L | Wiper on/off relay. | - |
| M | Relay for starter terminal 50 | - |
| N | 87M terminal circuit relay | - |
| O | Transmission oil coolant circulation pump relay | - |
| P | Backup relay | - |
| Q | Relay of terminal 15 (unprotected) | - |
| R | Relay of terminal 15 | - |
| S | Terminal relay 87 | - |
| T | Electric heated windshield relay | - |
| 201 | Alarm siren | 5A |
| 202 | Autonomous heater control unit | 20A |
| 203 | Front right headlight unit | 15A |
| 204 | Electronic stability control unit | 25A |
| 205 | Left buzzer and right buzzer | 15A |
| 206 | CDI control unit (engine 651) | 5A |
| 207 | 87M terminal circuit relay (diesel) | 5A |
| 208 | Relay terminal 87 (engines: 133, 607) | 7,5A |
| 209 | Front left headlight assembly | 15A |
| 210 | Starter pre relay, Heated front window relay | 5A |
| 211 | Not used | 7,5A |
| 212 | Ventilation line heater and cooling system thermostat heater, Exhaust gas recirculation cooler bypass switch valve (engine 651); Cable lug of electrical circuit terminal 87M3 (engines 133, 270); Lambda probe before catalytic converter, Boost pressure control servomechanism, CDI control unit (engine 607) | 15A |
| 213 | Cable end coupling terminal 87 (133, 270, 651 engines) / CDI Control Unit, Metering Valve, Camshaft Hall Sensor, Lambda Probe After Catalyst (607 engine) | 15A |
| 214 | Cable end coupling terminal 87 (133, 270, 651 engines) | 10A |
| 215 | Ignition coils for cylinders 1, 2, 3 and 4 (gasoline engines) / Metering valve (engine 651) / CDI control unit, Boost pressure control servomechanism, Metering valve (engine 607) | 20A |
| 216 | ME Control Box (gasoline engines) / Transmission Control Box (Engine 607) | 5A |
| 217 | Control unit for the fully integrated dual-clutch transmission control system (transmission 724) | 25A |
| 218 | Electronic Stability Control Unit | 5A |
| 219 | Not used | 5A |
| 220 | Transmission oil cooling circulating pump (gearbox 724) | 10A |
| 221 | Not used | 40A |
| 222 | Not used | 7,5A |
| 223 | Not used | - |
| 224 | COLLISION PREVENTION ASSIST control module and DISTRONIC electrical control module | 7,5A |
| 225 - 228 | Reserve | 5A |
| 229 | Front left headlight unit | 5A |
| 230 | Electronic traffic stabilization system control module | 5A |
| 231 | Front right headlight unit | 5A |
| 232 | Headlamp control module | 15A |
| 233 | Reserve | |
| 234 | Transmission Control Unit (607 engine) | 5A |
| 235 | Fan motor and Radiator louver actuator (Engine 607) / Charge air cooler circulation pump (Engine 133) | 7,5A |
| 236 | SAM control unit | 40A |
| 237 | Electronic Stability Control Unit | 40A |
| 238 | Heated windshield | 50A |
| 239 | Wiper mode relay 1/2 | 30A |
| 240A | Relay for starter terminal 50 | 25A |
| 240B | Relay terminal 15 (unsupported) | 25A |
| 241 | Reserve | 7,5A |
In the passenger compartment
The fuse box is located behind the floor panelling in the front passenger's feet.
For access, remove part of the panelling and the fuse box cover.
General view.
| Diagram | ||
|---|---|---|
|
||
| № | Description | Amps |
| A | Relay terminal 15 | - |
| B | Rear window wiper relay | - |
| C | Relay terminal 15R2 | - |
| D | Rear window heater relay | - |
| E | Relay terminal 15R1 | - |
| F | Relay terminal 30g | - |
| G | Not used | - |
| 21 | Additional electric heater (cars with diesel engine) | 150A |
| 22 | ECO Start-Stop function auxiliary battery relay | 200A |
| 23 | Front left door control unit | 30A |
| 24 | Front right door control unit | 30A |
| 25 | SAM control unit | 30A |
| 26 | Cable end coupling for additional battery for ECO Start-Stop function | 10A |
| 27 | Engine compartment fuse and relay module | 30A |
| 28 | Control unit for the interior sound generator | 5A |
| 29 | Trailer socket (up to 02.11.2014) or Trailer detection control unit (from 03.11.2014) | 15A |
| 30 | Trailer detection control unit | 5A |
| 31 | Four-wheel drive control unit | 5A |
| 32 | Signals from the steering column electronics module control unit | 5A |
| 33 | Audio module / COMAND system control panel | 5A |
| 34 | Climate control system control unit control panel | 7,5A |
| 35 | Rear window heater | 40A |
| 36 | Driver's seat lumbar support adjustment control unit, Driver's seat control unit | 7,5A |
| 37 | Audio module / COMAND system display | 7,5A |
| 38 | Passenger Restraint System Control Unit (Supplemental Restraint System) | 7,5A |
| 39 | Ceiling control panel | 10A |
| 40 | Transmission control unit (engine 651) | 15A |
| 41 | Panoramic sliding sunroof control module | 30A |
| 42 | Audio module and COMAND 5A or Audio module 25A control module | 5A / 25A |
| 43 | Parking Assist Control Unit | 5A |
| 44 | Reversible front left front seat belt tensioner | 40A |
| 45 | Reverse front right front seat belt tensioner | 40A |
| 46 | Front passenger seat lumbar support adjustment control unit, Front passenger seat control unit | 7,5A |
| 47 | Navigation module 7.5A, Adaptive damping system control unit 25A | 7,5A / 25A |
| 48 | Reserve | - |
| 49 | iPhone Drive Kit Control Unit 7.5A; COMAND Fan Motor 5A | 7,5A / 5A |
| 50 | Camera Cover Control Unit | 5A |
| 51 | Reserve | - |
| 52 | Parking interlock actuator motor signal | 30A |
| 53 | Reserve | |
| 54 | Reserve | |
| 55 | KEYLESS-GO control unit, Telecommunication Services Communication Module | 5A |
| 56 | Signals from the steering column electronic module control unit | 10A |
| 57 | Multifunction control unit for special vehicle 30A; | 30A / 7.5A / 5A |
| Multifunction control unit for special vehicle 7.5A; | ||
| Relay terminal 87 parking interlock actuator motor 5A | ||
| 58 | Special purpose vehicle fuse box | 30A |
| 59 | Front passenger seat control unit | 30A |
| 60 | Driver's seat control unit | 30A |
| 61 | Speaker amplifier control unit | 40A |
| 62 | Electric steering lock control unit (gearbox 711) | 20A |
| 63 | Fuel pump control unit (Mercedes w176 fuel pump fuse) | 25A |
| 64 | Toll data transmission control unit in DSRC standard, “Electronic Toll Collection” control unit | |
| 65 | Glove box illumination lamp | 5A |
| 66 | Special purpose vehicle fuse box 15A; Special purpose vehicle interface 5A | 15A / 5A |
| 67 | Reserve | - |
| 68 | Reserve | - |
| 69 | Reserve | - |
| 70 | Mercedes A-class W176 cigarette lighter socket on the center console at the rear of the passenger compartment | 25A |
| 71 | Socket in the trunk | 25A |
| 72 | Cigarette lighter with illuminated ashtray in front, Socket in passenger compartment | 25A |
| 73 | Electric parking brake control unit | 30A |
| 74 | 30A | |
| 75 | Trailer Recognition Control Unit | 20A |
| 76 | 25A | |
| 77 | 25A | |
| 78 | Special-purpose vehicle fuse box; Trunk lid control unit / tailgate tilt actuator control unit | 40A |
| 79 | SAM control unit | 40A |
| 80 | SAM control unit | 40A |
| 81 | Fan controller | 40A |
| 82 | Ceiling control panel | 10A |
| 83 | Electronic ignition switch control unit | 7,5A |
| 84 | Upper control panel | 5A |
| 85 | EDW / towing protection / interior security system control unit | 5A |
| 86 | Antenna amplifier / cell phone compensator (from 01.06.2016); FM, AM and ZV antenna amplifier | 5A |
| 87 | Diagnostic socket | 10 |
| 88 | Instrument cluster | 10 |
| 89 | Exterior lighting switch | 5A |
| 90 | Intelligent radar sensors in the rear bumper (left and right) | 5A |
| 91 | Footwell Light Switch, Pedal Press Control Sensor | 5A |
| 92 | Fuel pump control unit | 5A |
| 93 | Electric parking brake control unit | 5A |
| 94 | Supplemental Restraint System Control Unit (Supplemental Restraint System) | 7,5A |
| 95 | Weight Sensing System Control Unit, Front Passenger Seat Occupancy Recognition System | 7,5A |
| 96 | Trunk door windshield wiper motor | 15A |
| 97 | Cell phone electrical plug connection | 5A |
| 98 | SAM control unit | 5A |
| 99 | Tire pressure monitoring system control unit | 5A |
| 100 | DIRECT SELECT interface (Engine 133) | 5A |
| 101 | Four-wheel drive control unit | 10A |
| 102 | Remote control receiver for the autonomous heater or Drive mode control unit (AMG, from 01.09.2015) or Antenna switch for telephone and autonomous heater (from 01.06.2016) | 5A |
| 103 | Emergency call system control unit, telecommunications module, HERMES control unit | 5A |
| 104 | Multimedia connection module, Multimedia interface control unit | 5A |
| 105 | Satellite Digital Audio Radio (SDAR) control unit and digital radio control unit 5A / Tuner module 7.5A | 5A / 7,5A |
| 106 | Multifunction Camera | 5A |
| 107 | Digital TV tuner | 5A |
| 108 | Rear view camera | 5A |
| 109 | Electrical plug in cargo socket connection | 20A |
| 110 | Audio module, COMAND control module, Motorsound control unit | 30A |
