Mercedes W169 represents the second generation of the A-class Mercedes-Benz which was produced in 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 and was designated as Mercedes A150, Mercedes A160, Mercedes A170. During this time, the model has been restyled. In this material you will find information about the location of all electronic control units, a description of the fuses and relays Mercedes w169 with box diagrams and photo examples of their execution. Note the cigarette lighter fuse.
The execution of the boxes and the arrangement of elements in them may differ from those provided and depend on the year of manufacture and the level of electrical equipment of your car.
Contents
Location
Layout
Assignment
| 1 | ABS electronic control unit |
| 2 | Air conditioning control unit – in the heater control panel |
| 3 | Antenna amplifier 1 |
| 4 | Antenna Signal Amplifier 2 |
| 5 | Side impact sensor (left) |
| 6 | Side impact sensor (right) |
| 7 | Anti-theft system control unit |
| 8 | Vehicle tilt sensor (anti-theft system) |
| 9 | Anti-theft horn – on intake resonator |
| 10 | Volume change sensors (anti-theft system) |
| 11 | Audio system |
| 12 | Additional heater |
| 13 | Accumulator battery |
| 14 | CAN data bus, gateway control unit |
| 15 | Central locking signal sensor (infrared) – in the handle of the driver’s door |
| 16 | Diagnostic connector (DLC) |
| 17 | Left front door electrical control unit |
| 18 | Left rear door electrical control unit |
| 19 | Right front door electrical control unit |
| 20 | Right rear door electrical control unit |
| 21 | Fuse box/relay dashboard |
| 22 | Fuse/Relay Box, Footwell |
| 23 | Horns – behind the front bumper |
| 24 | Ignition lock control unit |
| 25 | Electronic immobilizer control unit – (integrated with ignition lock control unit) |
| 26 | Immobilizer Ring Antenna |
| 27 | Turn signal/alarm relay-in multifunction control box |
| 28 | Lighting control unit |
| 29 | Multifunctional control unit – connected to the fuse/relay box in the footwell -functions: Interior lamps, exterior lamps, horns, windshield wipers, central locking, power windows, direction indicators, anti-theft system, sunroof, seat heaters, immobilizer |
| 30 | Multifunction steering wheel controls |
| 31 | Multifunction switch control unit |
| 32 | Navigation system control unit |
| 33 | Ambient temperature sensor |
| 34 | Parking system control unit |
| 35 | Power steering control unit |
| 36 | Rain sensor – in the interior rearview mirror |
| 37 | Seat heating control unit |
| 38 | Passenger seat sensor – in the passenger seat |
| 39 | Steering column electrical control unit |
| 40 | SRS electronic control unit |
| 41 | Telephone network connection module |
| 42 | Phone interface control unit |
| 43 | Trailer control unit |
| 44 | Electronic transmission control unit – in the gearbox |
| 45 | Windshield Wiper Intermittent Relay |
Fuse box
The main fuse box is located next to the battery in the front passenger footwell. To access it, you need to remove the floor lining.
Diagram
Designation
| F1 | 10A Dorestyling: Brake light switch |
| 5A Facelift and restyle 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 |
| Control panel KLA (automatic climate control) | |
| F6 | 15A Left horn |
| Right horn | |
| F7 | 25A Fuel pump with fuel level sensor |
| F8 | 25A Ceiling Control Panel |
| F9 | 40A ESP and BAS control unit |
| F10 | 40A Fan motor |
| F11 | 30A Engines 266: Relay el. terminal 87 circuits, motor |
| 40 Engines 640: Relay el. terminal 87 circuits, motor | |
| F12 | 5A Steering column electronic module |
| Multifunction steering wheel | |
| F13 | 25A Front left door control unit |
| F14 | 25A Front right door control unit |
| F15 | 25A ESP and BAS control unit |
| F16 | 10A Diagnostic connector |
| PTS control unit (parktronic, dorestyling) | |
| F17 | 5A Exterior lighting rotary switch |
| F18 | 7.5A Transmission 711, 716: Reverse signal switch |
| F19 | 5A Micromechanical angular rate sensor AY |
| F20 | 7.5A SRS control unit |
| F21 | 30A Starter |
| F22 | 7.5A Instrument cluster |
| F23 | 20A Engines 640 (from 1.9.08): Fuel filter condensation sensor with heating element |
| 7.5A Dorestyling: Heated washer nozzles | |
| F24 | 7.5A Electric power steering (ES) control unit |
| F25 | 7.5A Brake light switch |
| ESP and BAS control unit | |
| F26 | 7.5A Gearbox 722: Selector lever electronic module control unit |
| F27 | 10A Transmission 722: Electrical control module CVT (continuously variable automatic transmission) |
| F28 | 5A Exterior lighting rotary switch |
| F29 | 30A SAM control unit |
| F30 | 25A Relay el. circuit terminal 87F |
| F31 | 5A Exterior lighting rotary switch |
| Central interface control unit (vehicles before 11/30/05) | |
| F32 | 7.5A Engines 266: ME control unit |
| F33 | 15A Audio system |
| Audio module and navigation unit | |
| Block-panel for control and indication COMAND | |
| F34 | 25A Rear left door control unit |
| F35 | 25A Rear right door control unit |
| F36 | 10A Facelift: PTS control unit (Parktronic) |
| trailer control unit | |
| 7.5A Dorestyling: Trailer control unit | |
| Electrical connector mobile phone chain | |
| F37 | 7.5A SRS control unit |
| Passenger/Child Seat Recognition Sensor on the Front Passenger Seat | |
| Front passenger seat occupied recognition | |
| F38 | 25A Cigarette lighter, front |
| F39 | 25A Wiper motor |
| F40 | 25A Sectional roof: Overhead control box (sunroof motor) |
| 7.5A Ceiling control box | |
| F41 | 15A Tailgate wiper motor |
| F42 | 7.5A Glove box lighting with microswitch |
| Vanity mirror lighting left and right | |
| Pedal Depression Sensor (Driving School Package) | |
| Footwell light switch (driving school package) | |
| Detachable connection VICS+ETC power supply (Japan) | |
| Emergency call system control unit (USA) | |
| F43 | 7.5A Motors 266: Cable lug electr. circuit terminals 87M1e |
| 15A Motors 640: Cable lug electr. circuit terminals 87M1e | |
| Dual-fuel gas-petrol engine: Cable lug electr. circuit terminals 87M1e | |
| F44 | 15A Motors 266: Cable lug electr. circuit terminals 87M2e |
| 20A Motors 640: Cable lug electr. circuit terminals 87M2e | |
| F45 | 25A Engines 640: CDI system control unit |
| F46 | 25A Woofer (Japan, facelift) |
| 40A Speaker amplifier (restyling) | |
| 7.5A UHI control unit (universal mobile phone interface) (pre-styling) | |
| GSM network compensator 1800 (dorestyling) | |
| Phone control unit (Japan, doestyling) | |
| F47 | 7.5A Electrical connector mobile phone chain |
| UHI control unit (universal mobile phone interface) | |
| Voice control system control unit (dorestyling) | |
| Phone control unit (Japan, doestyling) | |
| F48 | 7.5A EDW control unit / towing protection / interior protection system |
| alarm siren | |
| F49 | 25A Upper control box |
| Front left seat cushion heating element (dorestyling) | |
| Element for heating the back of the front left seat (dorestyling) | |
| Front right seat cushion heating element (dorestyling) | |
| Front right seat back heating element (dorestyling) | |
| F50 | 7.5A Multimedia interface control unit (restyling) |
| Digital TV tuner (restyling) | |
| Control unit for digital sound broadcasting system (restyling) | |
| CD changer (dorestyling) | |
| Detachable connection VICS + ETC power supply (Japan, doestyling) | |
| 30A Service vehicles: Roof beam | |
| Cable lug electr. terminal 30 circuits | |
| F51 | 10A Passenger weight system (WSS) control unit (Canada) |
| Control panel for special signals (service vehicles) | |
| F52 | 7.5A Emergency call system control unit (ve/m up to 31.5.06) |
| 5A Power supply VICS+ETC connector (Japan, vehicles before 5/31/06) | |
| F53 | 30A Interior socket |
| Cigar lighter with ashtray light, rear | |
| F54 | 15A Service vehicles: Socket 2-pole 12V |
| 25A Speaker system amplifier (pre-styling) | |
| Woofer (dorestyling) | |
| F55 | 7.5A Dorestyling and restyling with code 614: |
| Front left headlight | |
| Front right headlight | |
| 10A Facelift: Front left headlight | |
| F56 | 10A Facelift: Front right headlight |
| F57 | 15A AHV drawbar connector, 13-pin (restyled) |
| 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 drawbar connector, 13-pin |
| Trailer control unit (vehicles up to 31.5.05) | |
| F60 | 20A Driver’s seat contact strip |
| F61 | 20A Contact strip, front passenger seat |
| F62 | 40A Restyling: Relay el. terminal 15 circuits (2) (optional equipment: xenon headlights, mobile phone) |
| 25A Dorestyling: Relay el. terminal 15 circuits (2) (optional equipment: xenon headlights, mobile phone) | |
| F63 | 7.5A SDAR control unit (Canada) |
| 25A Roof beam (service vehicles) | |
| F64 | 40A Engines 266: Air pump relay |
| 80A Engines 640: End of glow plug time | |
| F65 | 80A Electric power steering (ES) control unit |
| F66 | 60A SAM control unit |
| F67 | 50A Relay el. terminal 15R circuits (2) (accessory) |
| F68 | 50A Standard equipment (facelift): Electric suction fan for engine and air conditioner with integrated regulator |
| 60A Special equipment (restyling): Dorestyling: (valid for engines 640.940, 640.941, 266.960, 266.980 and for engines 266.920, 266.940 with code (550): Drawbar)) | |
| F69 | 50A Relay el. circuit terminal 15R (1) |
| F70 | 60A Relay el. terminal 15 circuits (1) |
| F71 | 150A Engines 640: Additional PTC heater |
| F72 | 60A Dorestyling: Cable lug electr. terminal 30 circuits |
| Service vehicles: | |
| Fuse 7 (F7f7) | |
| Fuse 10 (F7f10) | |
| Taxi: | |
| Special vehicle multifunction control unit (MSS) |
Fuses 38 and 53 are responsible for the operation of the cigarette lighters.
Relay box
Under the instrument panel, at the feet of the front passenger, there is a block with a relay. You have to remove the trim to access it. The glove box does not need to be removed.
Diagram
Allocation
| Fuses | |
| 80 | 30A Taxi, company, rental cars: Special vehicle multifunction control unit (MSS) |
| 81 | 30A Taxi, company, rental cars: Special vehicle multifunction control unit (MSS) |
| 82 | 30A Taxi, company, rental cars: Special vehicle multifunction control unit (MSS) |
| 83 | 30A Taxi, company, rental cars: Special vehicle multifunction control unit (MSS) |
| Realy | |
| А | Relay el. circuit terminals 15R (2) |
| B | Relay el. circuit terminal 15R (1) |
| C | Horn relay |
| D | Heated rear window relay |
| E | Wiper relay, mode 1/2 |
| F | Wiper relay ON/OFF |
| G | Relay el. terminal 15 circuits (1) |
| H | Backup relay |
| I | Air pump relay |
| K | Fuel pump relay |
| L | Relay el. terminal 87 circuits, motor |
| М | Starter relay |
| N | Relay el. circuit terminal 87F |
| O | Relay el. terminal 15 circuits (2) |
That’s all. If you know how to make the material better – write in the comments.
Thanks for this info.
I really needed it, because my car will not start.