Fuses and relays Mercedes C-class (W203; 2000 - 2007)

The second generation C-Class (W203) appeared in 2000 and was produced in three bodies: sedan, station wagon and coupe, which was a sporty three-door hatchback. The sedan that served as the basis for the C-Class family in this generation differs from its predecessor in a sporty design with a dynamic silhouette. In this material, we will analyze in detail the fuse circuits for the Mercedes C-class of the 2nd generation (W203: C160, C180, C230, C240, C280, C320) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 release.

Photo of mercedes w203
Here you will find the locations and photos of the fuse blocks. Separately, we note the elements responsible for the cigarette lighter and fuel pump.

In the engine compartment

The location of the fuse box in the engine compartment of the car
The mounting block is located on the left side of the engine compartment. 

Photo of fuse box under the hood W203
General form.

Diagram
Diagram of fuses
No. Decoding A
F43a Horn relay 15
F43b 15
F44 Telephone 5
F45 SRS electronic unit 7.5
F46 Windshield wiper motor relay 40
F47 Glove box illumination lamp, front cigarette lighter fuse w203 - C160, C180, C230, C240, C280, C320 . 15
F48 Brake booster control unit (engine 112) 15
F49 SRS electronic unit 7.5
F50 Lighting control unit 5
F51 Air conditioning system, headlight range control unit, instrument panel, cooling fan motor 7.5
F52 Starter 15
F53 Engine management system (petrol), multifunction control unit 2 15
F54 Engine management system, air conditioning system (petrol) 7.5
F55 Steering wheel position sensor, sequential manual transmission - with manual transmission 7.5
F56 Brake light switch (brake pedal position sensor), electronic stability control (ESP) 5
F57 Steering wheel position sensor, electronic engine control module (ECM) (engine 112), electronic ignition switch 5
F58 Gearbox (sequential manual transmission) 40
F59 ESP (Vehicle Stability Support) 50
F60 40
F61 Gearbox (sequential manual transmission) 15
F62 Diagnostic connector (DLC), lighting control unit, brake light switch (brake pedal position sensor) 5
F63 Lighting control unit 5
F64 Audio system 10
F65 Exhaust air pump motor (if equipped) 40
No. Relay
I Horn
K Transmission (sequential manual transmission)
L Windshield wiper motor relay (1st and 2nd speed)
M Ignition circuit
N Gearbox pump (sequential manual gearbox)
O Exhaust air pump (112/113/271 engines)
P Ignition circuit
Q Windshield wiper motor (ON / OFF)
R Engine management system
S Starter


Next to the battery is a board consisting of power fuses.

Diagram
No. Description A
1 Fuse box in the cabin 125
2 SAM control unit, rear 200
3 Additional fuse box 125
4 SAM control unit, front 200
5 Electric suction fan for engine and air conditioner with integrated regulator 125
Diesel engines: Preheat output stage 125
6 SAM control unit, front 60

In the passenger compartment

The location of the fuse box in the passenger compartment
The fuse box is located in the left end of the dashboard behind a plastic cover.


Access example.

 Diagram
No. Description A
F21 electrical equipment of the left front door 30
F22 electrical equipment of the right front door 30
F23 Cigarette lighter fuse mercedes w203 - C160, C180, C230, C240, C280, C320. 15
F24 -  
F25 Heated rear window 10
F26 Audio system output amplifier 30
F27 Front left power seat control unit 30
F28 -  
F29 Multifunctional control unit (taxi) 30
F30 Air conditioner / heater fan motor 40
F31 egnition lock 20
F32 electrical equipment of the left rear door 30
F33 electrical equipment of the right rear door 30
F34 Telephone 7.5
F35 Additional heater 30
F36 -  
F37 Brake booster vacuum pump 25
F38 power front right seat 30
F39 -  
F40 Multifunctional control unit (taxi) 30
F41 Air conditioning / heater, multifunction switch control unit (upper) - center console (^ 05/01) 7.5
F42 Instrument cluster 7.5

In the luggage compartment

Location of the fuse box in the luggage compartment of the car
The unit is located on the left side of the luggage compartment. 


Photo is an example.

Diagram
No. Circuit breakers A
F1 power front left seat 30
F2 electric seat, right front. power seat relay (front) 30
F3 tire pressure monitoring system, interior lamp (rear) 7.5
F4 Fuel pump fuse w203 (gasoline engines) 20
F5 -  
F6 -  
F7 -  
F8 Antenna signal amplifier, anti-theft alarm horn, vehicle tilt sensor (anti-theft system) 7.5
F9 electric sunroof 25
F10 Heated rear window 40
F11 -  
F12 Accessory power connector (rear cigarette lighter) 15
F13 Lumbar support pump, spotlights (rear), telephone 5
F14 Rear window wiper motor (station wagon) 10
F15 Relay 1 of the drive of the lock of the fuel filler neck 10
F16 Telephone 20
F17 Trailer control unit 20
F18 Trailer electrical connector 20
F19 Lumbar support pump 20
F20 Rear window blind relay 7.5
No. Relay modules
A Fuel pump relay
B Ignition circuit
C -  
D -  
E heated rear window
F Ignition circuit
G Actuators 1 and 2 of the fuel filler neck lock
H
General layout of electrical equipment in the Mercedes W203
No. Element
1 Air conditioning / heater control module - in the heater control panel
2 A / C / Heater Fan Control Module - Near Fan Motor
3 Air purity sensor (air conditioning system)
4 Sunlight sensor (air conditioning system)
5 Antenna amplifier - 1, upper part of rear window
7 Anti-theft control module (combined with the multifunction control unit) - left side of the luggage compartment
8 Vehicle tilt sensor (anti-theft system) - left side of luggage compartment
9 Anti-theft alarm sound - behind the wheel arch trim
10 Volume change sensors (anti-theft system)
11 Audio module - in the navigation system
12 Audio Output Amplifier (If Equipped) -Right Luggage Compartment
13 Additional heater control unit
14 Additional heater remote control receiver - under dash (rear luggage compartment)
15 Battery
16 Brake booster vacuum pump control unit
17 Central locking signal sensor (infrared) - in the driver's door handle
18 Diagnostic connector (DLC)
19 Driver's door control module
20 Rear left door electrical control module
21 Passenger door electrical control module
22 Rear right door electrical control module
23 Fuse / relay box, engine compartment 1
24 Passenger compartment fuse box
25 Fuse / Relay Box, Luggage Compartment
26 Headlamp control module, left (models with xenon headlights)
27 Headlamp control module, right (models with xenon headlights)
28 Sound signals 1 / 2- behind the grille
29 Ignition switch control module
30 Electronic immobilizer control module - (combined with the ignition switch control unit)
31 Turn signal / alarm relay - in multifunction control unit 2
32 Lighting control module - behind the headlight switch
34 Multifunction control unit 1 - Attached to engine compartment fuse / relay box - Functions: Interior lamps, headlights, horns, windscreen wipers, air conditioning pressure monitoring, headlight washers, coolant level, brake fluid level, thermometer, electric drive door mirrors
35 Multifunctional control unit 2 - interconnected by fuse / relay box, luggage compartment-functions: Central locking, fuel level, anti-theft system, alarm, rear window defogger, taillights, tailgate opening drive, rear window wiper (station wagon)
36 Navigation control module
37 Ambient temperature sensor
38 Parking system control module - under the dash, in the rear of the luggage compartment
39 Rain Sensor - Windshield Upper Center
40 Seat power control module (with memory), front left - under the seat
41 Seat power control module (with memory), front right - under the seat
42 Seat heating control module, front -in the block of switches
43 Electronic control unit for gearbox - sequential manual gearbox
44 Side impact sensor, left - under the rear seat
45 Side impact sensor, right-under the rear seat
46 SRS electronic control unit
47 Steering column control module - behind the steering wheel
48 Steering column lock control module - integrated in the ignition lock control unit
49 Sunroof control module
50 Height sensor, front (models with xenon headlights) - front anti-roll bar
51 Height sensor, rear (models with xenon headlights) - rear axle
52 Telephone connection module - under the panel, in the rear of the luggage compartment
53 Phone interface control module - under the dash, in the rear of the luggage compartment
54 Telephone transceiver - under the dash, in the rear of the luggage compartment
55 Trailer electrical control module - under the panel, in the rear of the luggage compartment
56 gearbox control unit
57 Gear Shift Control Module - Automatic Transmission Selector
59 Voice activation system module - under the dash, in the rear of the luggage compartment
60 Fuse box, engine compartment 2
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