Mercedes 202 is a passenger car of a German auto manufacturer from the C-class series that was produced in 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001 with various engine options (C180, C200, C220 CDI, C230, C240, C280 ) in the w202 sedan and s202 station wagon. During this time, the model has been restyled. In this publication you will find information on the location of all electronic control units, a detailed description of the fuses and relays Mercedes 202 with box diagrams and photo examples. Note the cigarette lighter fuse.
The location of the blocks and the purpose of the elements in them may differ from those presented and depend on the year of manufacture and the level of equipment of your car. Check the information against your diagrams on the brochures in or next to the box covers.
Example of a brochure from a box cover
Contents
Location
Layout
Assignment
| 1 | Air conditioning electronic control unit |
| 2 | Antenna signal booster – ceiling panel (wagon) |
| 3 | Anti-theft control unit – right side of the luggage compartment |
| 7 | Vehicle tilt sensor (anti-theft system) |
| 8 | Anti-theft horn – behind the front left wheel arch trim |
| 9 | Volume change sensor (anti-theft system), left – B-pillar |
| 10 | Volume change sensor (anti-theft system), right – B-pillar |
| 11 | Audio Output Amplifier – LH Trunk |
| 12 | Additional heater control unit |
| 13 | Battery – spare wheel well |
| 14 | Central locking control unit – functions: Rear window defroster, interior lamp – rear, anti-theft system, trunk lid / rear door lamp, trunk lid / tailgate lock – right side of the luggage compartment |
| 15 | Diagnostic connector (DLC) |
| 16 | Door electrical control unit, driver’s side |
| 17 | Door electrical control unit, passenger side |
| 18 | Door electrical control unit, driver’s side (rear) |
| 19 | Door electrical control unit, passenger side (rear) |
| 20 | Power window control unit / power door mirror control unit – in the center console switch box |
| 21 | Fuse /Relay Box, Luggage Compartment (spare wheel well) |
| 22 | Fuse /Relay Box, Engine Compartment 1 |
| 23 | Fuse /Relay Box, Engine Compartment 2 |
| 24 | Headlight range control unit (xenon lamps) |
| 25 | Horns – behind the front bumper |
| 26 | Ignition lock control unit |
| 29 | Multifunctional control unit 1 – functions: Central locking, alarm, rear window defroster, direction indicators, windshield wipers, headlight washers, air conditioning, head restraints (rear), horns |
| 30 | Multifunctional control unit 2-functions: Interior lamps, sunroof, vanity mirror lamps |
| 31 | Navigation control unit – spare wheel well |
| 32 | Ambient temperature sensor |
| 33 | Parking system control unit – right footwell |
| 34 | Rain sensor – in the interior rearview mirror |
| 35 | Rear Wiper/Washer Relay – Behind Tailgate Lower Trim (Wagon) |
| 36 | Relay Box-Functions: Overload/Surge Protection Relay, Starter Relay, Exhaust Air Pump Relay (Gasoline), Transmission Control System Relay (Diesel) |
| 37 | Seat heating control unit, front – in the switch block |
| 38 | Side impact sensor, left – under the front seat |
| 39 | Side impact sensor, right – under the front seat |
| 40 | SRS electronic control unit |
| 41 | Body height sensor, front – headlight control (xenon lamps) |
| 42 | Body height sensor, rear – headlight control (xenon lamps) |
| 43 | Phone interface control unit – spare wheel well |
| 44 | Phone interface control unit – luggage compartment left side (for mobile phone) |
| 45 | Phone interface control unit – luggage compartment right side (for mobile phone) (station wagon) |
| 46 | Electronic Transmission Control Module – Front Right Footwell |
| 48 | Voice Activation Unit – LH Trunk |
| 49 | Voice activation system unit – right side of the luggage compartment (station wagon) |
Engine compartment
Main fuse and relay box
It is located under the hood on the left side of the engine compartment and can consist of two sections (fuses and relays).
Relay
Type 1
Diagram
Designation
- Horn relay
- Windshield washer pump relay
- Windshield wiper motor relay 1
- Windshield wiper motor relay 2
- Headlight washer pump relay
- ABS Pump Motor Relay (TCS/ESP)
Type 2
Diagram
Allocation
- A – K3/1 Relay for additional heating of the exhaust turbo line (PSV)
- B – K20 Pre-fuel pump relay
- C/D – K9 Auxiliary Fan Relay
- E – K2 Headlight wiper/washer relay
- F – K39 Horn relay
- G – K19/1 Option module relay
- H – K17 Fan relay
- K – N10 Combination relay (direction indicators, heated rear window, wiper motor, etc.)
- L – N7 Lamp control relay
Fuses
Type 1
Diagram
Appointment
| F1 | (5A) Seat heating control unit (front), seat belt drive (comfort) |
| F2 | (5A) Passenger seat sensor, side impact sensors, seat belt pretensioner control unit |
| F3 | (15A) Audio system, telephone, voice activation system unit |
| F4 | (5A) Instrument cluster |
| F5 | (15A) Accessory power connector (station wagon), navigation system, sunblind |
| F6 | (7.5A) Folding door mirrors |
| F7 | (7.5A) Power door mirrors, power windows, rheostat for dimming the illumination of the instrument cluster, reversing light switch, rear door / trunk lid lock, navigation system, telephone (06/98), control unit (in case of accident) (06/98-05/99) |
| F8 | (30A) Door electrical control module, driver’s side |
| F9 | (25A) Sunroof, interior lamps, rain sensor, full door lock, instrument cluster illumination rheostat, auto-dimming mirrors, remote central locking system |
| F10 | (15A) Audio system, telephone |
| F11 | (20A) Seat heater |
| F12 | (25 A) Audio system |
| F13 | (15A) Reversing lamp(s) (06/98), headlight range control unit (xenon lamps) |
| F14 | (5A) Parking system control unit |
| F15 | (15A) Rear window wiper/washer (station wagon) |
| F16 | (5A) Stability Program |
| F17 | (30A) Door electrical control unit, driver’s side (rear) |
| F18 | (25A) Turn signal repeaters (^05/98), trailer electrical connector |
| F19 | (10A) Instrument cluster, lamp health monitoring unit, daytime lighting control unit |
| F20 | (15A) Air conditioning system, heating / ventilation |
| F21 | — |
| F22 | (10A) Combination Switch (Wiper/Windshield Washer, Turn Signals, Low/High Beams, Headlight Washers) |
| F23 | (15 A) Cigarette lighter fuse, glove box light |
| F24 | (15A) Front/rear markers (right), trailer electrical connector (rear left marker), instrument cluster, license plate lamps, cigarette lighter lamp, headlight washers |
| F25 | (7.5A) Front / rear markers (right), trailer electrical connector (rear right marker) |
| F26 | (7.5A) Fog lights, trailer electrical connector (fog lights) |
| F27 | (15A) Steering column adjustment actuator |
| F28 | (10A) Cigarette lighter, minibar |
| F29 | (30A) A/C/heater fan motor |
| F30 | (10A) Instrument cluster, air conditioning system, heating/ventilation |
| F31 | (7.5A / 15A) Right headlight – dipped beam |
| F32 | (7.5A/15A) Left headlight – low beam |
| F33 | (7.5A) Right headlight – high beam |
| F34 | (7.5A) Left headlight – high beam |
| F35 | (15A) Fog lights |
| F36 | — |
| F37 | — |
| F38 | (30A/40A/60A) Air conditioner |
| F39 | — |
| F40 | (10A) Sound signals |
| F41 | (15A) Direction indicators, instrument cluster lamps – indicators, horns, windshield wiper/washer, rain sensor, rear window defroster, cooling fan motor, auxiliary heating/air conditioning system, headlight washers, hazard warning lights |
| F42 | (7.5A) Windshield washer fluid heater |
| F43 | (7.5A) Windshield washer pump motor |
| F44 | (40A) Windshield wipers, rain sensor |
| F45 | (15A) Headlight washers |
The number 23 fuse is responsible for the cigarette lighter.
Type 2
Diagram
Decoding
| F1 | (7.5A) Direction indicators |
| F2 | (15A) Horns, heater control unit |
| F3 | (15A) Brake lights, instrument cluster, lamp health monitor, windshield washer jet heaters |
| F4 | (7.5A) Dipped beam – right headlight |
| F5 | (7.5A) Dipped beam – left headlight |
| F6 | (7.5A) High beam – right headlight |
| F7 | (7.5A) High beam – left headlight, high beam indicator |
| F8 | (10A) Fog lights |
| F9 | (30A) Heater fan motor |
| F10 | (15A) Instrument cluster and alarm |
| F11 | (40A) Rear window heater |
| F12 | (10A) Air conditioning system, heater |
| F13 | (40A) Windshield wiper motor, windshield washers, headlight high beam switch |
| F14 | (15A) Cigarette lighter, glove box light |
| F15 | (15A) Front marker – right, rear marker – right, instrument cluster illumination, license plate lamps |
| F16 | (7.5A) Front marker – left, rear marker – left |
| F17 | (7.5A) Rear fog lamp |
| F18 | (7.5A) Heater fan motor control unit, air conditioner condenser fan motor |
| F19 | (15A) Trailer electrical connector |
| F20 | (7.5A) SRS indicator |
| F21 | (15A) Audio system, telephone, seat heating control unit |
| F22 | (10A) Rear window blinds |
| F23 | (15A) Interior lamps, anti-theft system, rear seat head restraints, rear window wiper/washer |
| F24 | (15A) Reversing lights, electric door mirrors |
| F25 | (20A) Seat heater |
| F26 | (15A) Audio system, telephone |
| F27 | (15A) Interior lamps, luggage compartment lamps, central locking, anti-theft system |
| F28 | — |
| F29 | (30A) Air conditioning condenser fan |
The number 14 fuse is responsible for the cigarette lighter.
Type 3
Diagram
Assignment
| F1 | (7.5A) Dipped beam – right headlight |
| F2 | (10A/15A) Cigarette lighter, glove box light, audio system |
| F3 | (10A) Audio system, heater control, air conditioning |
| F4 | (15A) Direction indicators, alarm, clock |
| F5 | (20 A) Sound signals, heater control unit, air conditioning |
| F6 | (7.5A) Direction indicators – left |
| F7 | (7.5A) Dipped beam – left headlight |
| F8 | (7.5A) Rear window heater, interior rear view mirrors |
| F9 | (7.5A) Cigarette lighter lamp, license plate lamps, instrument cluster |
| F10 | Spare |
| F11 | (7.5A) Air conditioner |
| F12 | (10A) Stop lights, instrument cluster, lamp health monitor |
| F13 | (30A) auxiliary heater fan motor |
| F14 | (30A) Heater fan motor |
| F15 | (30A) Windshield wiper motor |
| F16 | (30A) Rear window heater |
| F17 | (40A) Air outlet pump motor |
| F18 | (7.5A) Front marker – left, rear marker – left |
| F19 | (7.5A) High beam – right headlight |
| F20 | (10A/15A) Seat heaters, audio system, telephone, sunblind – rear |
| F21 | (7.5A) Antenna |
| F22 | (10A) Fog lights |
| F23 | (15A) Diagnostic connector, overload protection, EVAP valve, exhaust gas recirculation (EGR) valve, variable valve timing actuator, glow plug relay |
| F24 | (10A) Front marker – left, rear marker – left |
| F25 | (7.5A) High beam – left headlight, high beam indicator |
| F26 | (7.5A) SRS indicator, power window control unit, telephone |
| F27 | (7.5A) Local lighting lamps Interior lighting lamp |
| F28 | (7.5A) Rear fog lights |
| F29 | (15A) Reversing lights, power door mirrors, door mirror heaters, windshield washer jet heaters, gear selector position sensor |
| F30 | (10A) Washer/headlight cleaner |
| F31 | Spare |
| F32 | (7.5A) Diagnostic unit |
| F33 | (15A) Interior lamps, trunk lamp, vanity mirror lamps, central locking |
| F34 | (7.5A) Electric headrest adjustment motors, daytime lighting system |
| F35 | (7.5A) Interior lamp – front, anti-theft system, trailer electrical control unit |
The number 2 fuse is responsible for the cigarette lighter.
Additional fuse and relay box
It is installed in the pave part of the engine compartment.
Diagram
Designation
| 1 | Electronic engine control unit |
| 2 | ABS/ESP electronic control unit |
| 3 | Relay Box – Includes: Overload/Surge Protection Relay, Starter Relay, Exhaust Air Pump Relay – Gasoline |
| 4 | Starter relay |
| 5 | Diagnostic connector (DLC) |
| F1 | (7.5A) Diagnostic connector (DLC) |
| F2 | (10A) ABS/ESP-petrol |
| F3 | (10A/25A) Automatic transmission |
| F4 | (15A) Mercedes 202 engine management system – gasoline |
| F5 | (20A) Engine management system – gasoline |
| F6 | (15A) Engine management system – gasoline |
| F7 | (40A) Exhaust air pump – petrol |
Luggage compartment
There is another fuse box in the luggage compartment next to the battery. Next to it is the fuel pump relay.
Type 1
Diagram
Allocation
| F1 | 25A Audio system |
| F2 | 7.5A Multifunctional control box |
| F3 | 20A Anti-theft system |
| F4 | 7.5A Antenna |
| F5 | 7.5A Interior lamps |
| F6 | 25A Trailer electrical equipment |
| F7 | 30A Power windows – rear |
| F8 | 30A Power windows – front |
| F9 | 20A Luke |
| F10 | 30A Power seat – left |
| F11 | 20A Power seat – left |
| F12 | 20A Power seat – right |
| F13 | 20A Power seat – right |
Type 2
Diagram
Appointment
| F1 | 25A Fuel pump |
| F2 | 30A Central locking control unit |
| F3 | 30A Power window (driver’s door) |
| F4 | 40A Central locking control unit |
| F5 | 30A Power window, driver’s side (rear) |
| F6 | 5A Interior lamp – rear, rear door / trunk lid illumination lamp, power seats |
| F7 | 5A Anti-theft system |
| F8 | — |
| F9 | — |
| F10 | 25A Electric drive of the left front seat |
| F11 | 25A Electric drive of the left front seat |
| F12 | 25A Power right front seat |
| F13 | 25A Power right front seat |
| F14 | — |
| F15 | — |
| F16 | — |
| F17 | — |
Type 3
Diagram
Decoding
| F1 | 25A Power seat (left) |
| F2 | 25A Power seat (right) |
| F3 | 25A Power seat (left) |
| F4 | 25A Power seat (right) |
| F5 | 25A Audio system |
| F6 | 7.5A CD changer |
| F7 | 30A Power windows – rear |
| F8 | 7.5A Anti-theft system control unit |
| F9 | 7.5A Multifunctional control box |
| F10 | 30A Power windows – front |
| F11 | 20A Anti-theft system, horns |
| F12 | 20A Seat heater |
| F13 | 20A Luke |
| F14 | 25A Anti-theft system |
| F15 | Spare |
| F16 | Spare |
| F17 | 30A Telephone |
| F18 | 25A Trailer electrical equipment |
| F19 | Spare |
Found a mistake or have something to add? We welcome your comments.
Tengo un c180 w202 1998 y no me sirven las intermitentes de emergencia. Ni me enciende la luz de reversa.
Thanks. I was able to fix my faulty horns from the information I got
I bought a 00 Mercedes C230 Kompressor, I check the fuel pump to see if it has current, I had a hard time location the fuel pump fuse. Thanks for your diagram i solve the problem.