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Mercede-Benz C-Class w202 (1993 - 2001) - fuse box diagram

avatar Jonathan Yarden Feb 11, 2021 · 5 min. read

In this article you will find a description of fuses and relays Mercedes-Benz, with photos of block diagrams and their locations. Highlighted the cigarette lighter fuse (as the most popular thing people look for).
Get tips on blown fuses, replacing a fuse, and more.

Year of production: 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001

Main fuse box in engine compartment (up to 30.11.94)

Mercedes-Benz C-Class w202 - fuse box diagram - main box in engine compartment

Number A Description
1 7,5 Right low beam headlamp
2 15 Front cigar lighter with ashtray illumination
Glove box lamp with switch
Radio (up to 09/93)
3 10 Seat belt warning control module (USA)
Automatic heater pushbutton control module
Automatic air conditioning (AC) pushbutton control module
Air conditioning (tempmatic) pushbutton control module
Residual engine heat utilization time-limit relay
Radio
Seat belt and vehicle speed warning control module
4 15 Hazard warning flasher with trailer
Instrument cluster
Timer
Warning buzzer
Taxi roof sign
5 20 Seat belt and vehicle speed warning control module
Radio
Automatic heater pushbutton control module
Automatic air conditioning (AC) pushbutton control module
Air conditioning (tempmatic) pushbutton control module
Residual engine heat utilization time-limit relay
Fanfare horns
6 7,5 Turn signals with trailer
7 7,5 Left low beam headlamp
8 7,5 Rear window defroster switch
9 7,5 Cigar lighter illumination
License plate illumination
Instrument cluster, instrument illumination
10 Spare
11 7,5 Auxiliary fan relay, 1st and 2nd stage (K9) Air conditioning (automatic)/air conditioning (tempmatic)
Automatic air conditioning (AC) pushbutton control module
Air conditioning (tempmatic) pushbutton control module
12 10 Stop lamp switch:
Stop lamp
Trailer stop lamp
Brake signal for ABS
Brake signal for ASR
Brake signal for ASD
Brake signal for cruise control
Cruise control module
Instrument cluster, bulb failure indicator lamp
Exterior lamp failure monitoring module
13 30 Auxiliary fan relay, first and second stage
14 30 Heating systems recirculation unit:
Blower motor
Blower regulator
15 30 Combination switch:
Headlamp flasher
Headlamp cleaning system
Windshield washer pump
Wiper motor
Combination relay
16 30 Combination relay: Rear window defroster control
17 40 Air injection relay, engine 104 HFM-SFI
18 7,5 Via exterior lamp failure monitoring module:
Left parking lamp/taillamp
Front left side marker lamp
Rear left side marker lamp
Trailer taillamp
19 7,5 Right main beam headlamp
20 10 Rear window electric sun shade switch
Radio
Front heated seat (HS) control module
21 20 Automatic antenna
7,5 Radio
22 10 Right/left fog lamp
23 15 Overvoltage protection relay
Kick-down cut-out relay
Data link connector
Clutch pedal switch, idle speed control
Purge control valve
Preglow time-limit relay
Engine speed mixture preparation control module
Cruise control switch
Camshaft adjuster Intake manifold heater relay Tank vent valve
Variable resonance intake manifold switchover valve
24 10 Headlamp cleaning system
Via exterior lamp failure monitoring module:
Right parking lamp, taillamp
Front right side marker lamp
Rear right side marker lamp
Trailer taillamp
25 7,5 Left main beam headlamp
Main beam indicator lamp
26 7,5 Telephone transmitter/receiver
Convenience relay
Convenience control module
SRS malfunction indicator lamp
27 7,5 Left front door entrance/exit lamp
Right front door entrance/exit lamp
Data link connector
28 7,5 Rear fog lamp with trailer
29 15 Left/right heated windshield washer nozzle
Outside rearview mirror adjustment with heated mirrors:
Outside rearview mirror/interior mirror switch (S50)
Mirror heater
Reverse lamp switch, manual transmission
Starter lockout/reverse lamp switch, automatic transmission
30 10 Headlamp cleaning system:
Headlamp washer relay
Left and right headlamp wiper motor
31 Spare
32 7,5 Test coupling for diagnostic module II (USA)
Diagnostic module II (USA)
33 15 Front dome lamp with switch-off delay and reading lamp
Rear dome lamp
Trunk lamp
Left and right sun visor with illuminated vanity mirror
Pneumatic system equipment, central locking
34 10 Outside rearview mirror with fold-in/out feature
Head restraint release valve with shut-off delay
Daytime driving lamp control module
35 7,5 Pneumatic system equipment, central locking
Front dome lamp with switch-off delay and reading lamp
Immobilizer relay
ATA control module with/without infrared remote control
Trailer recognition control module

Main fuse box in engine compartment (1.12.94-31.5.97)

as of 1.12.94 up to 31.8.96

Mercedes-Benz C-Class w202 - fuse box diagram - main box in engine compartment

as of 1.9.96 up to 31.5.97

Mercedes-Benz C-Class w202 - fuse box diagram - main box in engine compartment

Number A Description
1 7,5 Turn signal lamps
Trailer turn signal lamps
Taximeter, taxi (up to 31.8.95)
2 20 as of 1.12.94 up to 31.8.95:
Fanfare horns
Automatic heater:
Hot water circulation pump
Automatic heater pushbutton control module
Duo valve
Automatic heater with recirculated air and residual engine heat utilization system:
Automatic heater control pushbutton unit with recirculating air
Aspirator blower
Air conditioning (tempmatic) pushbutton control module
Automatic air conditioning (AC) pushbutton control module
Daytime driving lamp control module
Seat belt warning control module
Seat belt and vehicle speed warning control module
as of 1.9.95 up to 31.5.97:
Fanfare horn
Air conditioning (Tempmatic):
Electric suction-type fan control module
Recirculated air valve
Air conditioning (Tempmatic) or Air conditioning (Automatic)
Electric suction-type fan control module
Daytime running lamp control module
15 as of 1.9.95 up to 31.5.97:
Fanfare horn
Automatic heater: Circulated air valve
Automatic heater
Daytime running lamp control module
3 10 as of 1.12.94 up to 31.8.95:
Instrument cluster
Exterior lamp failure monitoring module
Stop lamp switch:
Stop lamp
Trailer stop lamp
Brake signal for cruise control
Brake signal for ABS
Brake signal for ASR
Brake signal for ASD
Cruise control module/stop lamp switch with intermediate bridge
7,5 as of 1.9.95 up to 31.8.96:
Instrument cluster
Exterior lamp failure monitoring module
Taximeter, taxi
15 as of 1.9.96 up to 31.5.97:
Instrument cluster
Exterior lamp failure monitoring module
Stop lamp switch:
Stop lamps
Trailer stop lamps
Center high-mounted stop lamp
Traction system control module
Heated windshield washer nozzle
Left
Right
Heated washer nozzle hose
Left
Right
Taximeter
4 7,5 Right low beam headlamp
15 ATA low beam headlamp
5 7,5 Left low beam headlamp
6 7,5 Right main beam headlamp
7 7,5 Left main beam headlamp
Main beam headlamp indicator
8 10 Left fog lamp
Right fog lamp
9 40 up to 31.8.95: Blower regulator, air conditioning (automatic)/air conditioning (tempmatic)
30 as of 1.9.95 up to 31.5.97: Blower regulator, air conditioning (automatic)/air conditioning (tempmatic)
10 15 Hazard warning flasher with trailer
Instrument cluster
Taxi roof sign
11 40 Rear window defroster: Combination relay (turn/hazard signal, heated rear window, wiper motor)
12 20 up to 31.8.95:
Automatic heater with recirculated air and residual engine heat utilization system:
Hot water circulation pump
Fresh/recirculated air flap switch-over valve
Duo valve
Air conditioning (tempmatic) pushbutton control module
Automatic air conditioning (AC) pushbutton control module
Seat belt warning control module
Automatic heater with recirculated air and residual engine heat utilization system:
Residual engine heat utilization time-limit relay
Cigar lighter (customer option)
10 as of 1.9.95 up to 31.5.97:
Lamp warning buzzer
Automatic heater with recirculated air and residual engine heat utilization system
Air conditioning (tempmatic)
Air conditioning (automatic)
Minibar (customer option)
Cigar lighter (customer option)
15 as of 1.9.95 up to 31.5.97 (Only when cigar lighter is reconnected to t. 30):
Lamp warning buzzer
Automatic heater with recirculated air and residual engine heat utilization system
Air conditioning (tempmatic)
Air conditioning (automatic)
Minibar (customer option)
Cigar lighter (customer option)
13 40 Combination relay:
Wiper motor (interval circuit)
Rear window defroster control (as of 1.9.96 up to 31.5.97)
Rear window defroster (as of 1.9.95 up to 31.8.96):
Rear window defroster switch
Combination switch:
Headlamp flasher
Windshield wiper motor
Windshield washer pump
Wiper motor
Wiper motor (interval circuit)
14 15 Front cigar lighter with ashtray illumination
Glove box lamp with switch
Rear window defroster switch (as of 1.12.94 up to 31.8.95)
Garage door opener (USA; as of 1.9.96 up to 31.5.97)
Rear heated seat relay (customer option)
15 15 Right parking lamp
Right taillamp
Right front side marker lamp
Right rear side marker lamp
Right trailer taillamp
Instrument cluster
Headlamp cleaning system connected
License plate illumination
Cigar lighter illumination
16 7,5 Left parking lamp
Left taillamp
Left front side marker lamp
Left rear side marker lamp
Left trailer taillamp
17 7,5 Rear fog lamp
Rear fog lamp on trailer
18 40 up to 31.8.95:
Automatic heater:
Air volume switch, blower motor
Automatic heater with recirculated air and residual engine heat utilization system:
Air volume switch, blower motor
7,5 as of 1.12.94 up to 31.8.95:
Air conditioning (tempmatic) pushbutton control module
Automatic air conditioning (AC) pushbutton control module
as of 1.9.95 up to 31.8.96:
Automatic heater:
Air volume switch, blower motor
Automatic heater with recirculated air and residual engine heat utilization system:
Air volume switch, blower motor
Air conditioning (tempmatic):
Blower, auxiliary fan
Air conditioning (automatic):
Blower, auxiliary fan
as of 1.9.96 up to 31.5.97:
Automatic heater:
Blower
A/C pushbutton control module (Tempmatic A/C)
Blower, auxiliary fan
A/C pushbutton control module (Automatic A/C)
Blower, auxiliary
19 15 as of 1.9.95 up to 31.5.97: Cargo area connector box, T-models
20 7,5 Airbag malfunction indicator:
SRS malfunction indicator lamp
Emergency tensioning retractor control module with airbag
Convenience relay
21 15 Radio
Telephone transmitter/receiver
Front heated seat (HS) control module
22 10 Rear window electric sun shade switch
23 15 Front dome lamp with switch-off delay and reading lamp
ATA control module
Infrared remote central locking control module
Dimmable interior rearview mirror:
Electronic inside rearview mirror dimming
ATA:
Immobilizer relay
Rear head restraint release:
Head restraint release valve with shut-off delay
Socket, trailer coupling, 13-pin
24 15 Left/right outside mirror adjustment:
Mirror heater
Outside rearview mirror/interior mirror switch
Backup lamp switch
Left/right outside mirror adjustment with foldin/out feature:
Mirror heater
Outside rearview mirror/interior mirror switch
Outside rearview mirror with fold-in/out feature, mirror folding motors
Orthopedic backrest
25 20 Front heated seat (HS) control module
26 15 Radio
Telephone transmitter/receiver
27 15 Front dome lamp with switch-off delay and reading lamp
Rear dome lamp
Trunk lamp
Infrared remote central locking control module
Pneumatic system equipment, central locking
28 40 Via air injection relay: Electric air pump
29 30 Auxiliary fan ECE
Auxiliary fan (USA, Japan)
30 15 as of 1.12.94 up to 31.8.95:
Overvoltage protection relay
Preglow time-limit relay
Kick-down cut-out relay
Purge control valve
Electromagnetic actuator, adjustable camshaft timing
Clutch pedal switch, idle speed control
Tank vent valve
Variable resonance intake manifold valve
30 as of 1.9.95 up to 31.8.96:
Overvoltage protection relay
Preglow time-limit relay
Electromagnetic actuator, adjustable camshaft timing
Purge control valve
Kick-down cut-out relay
Stop lamp switch:
Stop lamp
Trailer stop lamp
Brake signal for cruise control
Brake signal for ABS
Brake signal for ASR
Brake signal for ASD
Cruise control module
Tank vent valve
Variable resonance intake manifold switchover valve, 6 cylinder
31 10 Left/right heated windshield washer nozzle
Windshield washer water heater
Starter lockout/reverse lamp switch
Automatic transmission
Auxiliary fan relay, 1st stage and 2nd stage (up to 31.8.95)
32 7,5 Data link connector
Diesel shut-off valve (up to 31.8.95)
33 7,5 Test coupling for diagnostic module II (USA)
Diagnostic module II (USA)

Main fuse box in engine compartment (as of 31.5.97)

Mercedes-Benz C-Class w202 - fuse box diagram - main box in engine compartment

Number A Description
1 5 Front heated seat (HS) control module
Left front seat belt comfort feature solenoid (up to 31.5.98)
Right front seat belt comfort feature solenoid (up to 31.5.98)
Seat adjustment relay (as of 1.6.98 up to 31.5.99)
Automatic seat belt convenience feature (as of 1.6.99)
2 5 Emergency tensioning retractor (ETR) control module with airbag (AB)
Automatic child seat recognition sensor (ACSR)
Left side airbag sensor
Right side airbag sensor
3 15 as of 1.6.97 up to 31.5.99:
Radio
CTEL transmitter receiver for MB D-net telephone or “Standard” D-net telephone (up to 31.5.98)
CTEL interface for “Handy” D-net telephone (up to 31.5.98)
Voice control system (as of 1.6.98 up to 31.5.99)
5 as of 1.6.99:
Cellular telephone/Handy (USA; as of 1.6.99)
CTEL transmitter and receiver with permanent installation
Cellular telephone interface with “Handy” telephone
Voice control system (VCS)
4 5 Instrument cluster: Airbag indicator and warning lamp, supplemental restraint system (SRS)
5 15 as of 1.6.97 up to 31.5.98:
Rear window sun shade switch (center console)
Navigation processor
Load compartment socket (model 202 T-model)
20 as of 1.6.98:
Rear window sun shade switch (center console)
Center console: Outside rearview mirror switch (with fold-in/out feature)
6 7,5 as of 1.6.97 up to 31.5.98:
Center console: Outside rearview mirror switch (with fold-in/out feature)
as of 1.6.98 up to 31.5.99:
Auto pilot system (APS)
Navigation processor
CTEL transmitter and receiver with D-network telephone, permanent installation
Cellular telephone interface with “Handy” D-network
Emergency call system, TELE AID
as of 1.6.99:
Emergency call system
7 7,5 Lower control panel:
Outside rearview mirror adjustment
Left/right power window
Switch illumination
Reverse gear recognition
Trunk lid remote control
Auto pilot system (APS) (up to 31.5.99)
CTEL transmitter and receiver with D-network telephone, permanent installation (as of 1.6.98)
Cellular telephone interface with “Handy” D-network (as of 1.6.98)
Emergency call system, TELE AID (as of 1.6.98 up to 31.5.99)
Navigation processor (as of 1.6.98 up to 31.5.99)
8 30 Front driver-side door control module:
Exit lamp
Outside mirror adjustment, defroster
Power window
Seat memory switch
Switch illumination
Central locking
Convenience closing
9 25 Overhead control panel:
Sliding/pop-up roof
Front/rear dome lamp
Rain sensor
Convenience closing
Make-up mirror
Inside rearview mirror dimmer
Interior RF receiver
Outside rearview mirror dimmer
Switch illumination
Garage door opener (USA)
10 15 Radio
CTEL transmitter receiver for MB D-net telephone or “Standard” D-net telephone or CTEL interface for “Handy” D-net telephone (up to 31.5.98)
11 20 Front heated seat
12 25 Sound system: Left/right audio power amplifier
13 15 Headlamp range adjustment control module (with xenon headlamp)
Reverse lamp (to switch) (as of 1.6.98)
14 5 Parktronic system (PTS)
Taximeter
15 15 as of 1.6.97 up to 31.5.99 (T-models):
Rear wiper
as of 1.6.99:
Stop lamp (NO contact):
Stop lamps
Traction systems control module
3rd stop lamp
Trailer stop lamps
16 5 as of 1.6.97 up to 31.5.99:
Steering angle sensor, for electronic stability program (ESP)
as of 1.6.99:
Rear window wiper (T-model)
17 30 Rear driver-side door control module:
Comfort closing
Switch illumination
Central locking
Exit lamp
Outside rearview mirror adjustment, defroster
Power window
Seat memory switch
18 25 Flasher with trailer
Hazard warning flasher with trailer (up to 31.5.98)
Auxiliary turn signals (up to 31.5.98)
Trailer continuous positive (up to 31.5.98)
19 10 Instrument cluster
Exterior lamp failure monitoring unit
Daytime running lamp control module
Stop lamp (normally open contacts; up to 31.5.99):
Stop lamps
Traction system control module
Center high-mounted stop lamp
Trailer stop lamps
20 15 Automatic heater (HEAT):
Heater pushbutton control module
In-car temperature sensor
Fresh/recirculated air flap switch-over valve
Air conditioning (Tempmatic):
A/C pushbutton control module (Tempmatic A/C)
In-car temperature sensor
Fresh/recirculated air flap switch-over valve
Air conditioning (automatic):
A/C pushbutton control module (automatic A/C)
Emissions sensor (up to 31.5.98)
21 15
22 10 Combination switch:
Windshield wiper
Headlamp flasher
Windshield washer pump
Turn signals, turn signal indicator, control
23 15 Front cigar lighter (with ashtray illumination)
Glove compartment lamp
Garage door opener (USA; up to 31.5.98)
24 15 Right parking lamp
Right taillamp
Front and rear right side marker lamps
Right trailer taillamp
Instrument cluster
License plate illumination
Cigar lighter illumination
Headlamp cleaning system
25 7,5 Left parking lamp
Left taillamp
Front and rear left side marker lamps
Left trailer taillamp
26 7,5 Rear fog lamp
Rear fog lamp, trailer
27 15 Electronic steering column lock:
Electric steering column (ESC) control module
Coil
28 10 as of 1.6.97 up to 31.5.99:
Roof sign (taxi; up to 31.5.98)
Cigar lighter
Minibar
5 as of 1.6.99: Steering angle sensor, with Electronic Stability Program (ESP)
29 30 Blower motor
as of 1.9.96: Auxiliary fan (engines 111.943/.973, 112, 604, 605 with code 581a)
40 as of 1.9.96: Electric suction-type fan (engine 111 with code 581a)
30 10 Instrument cluster Automatic heater (HEAT):
Heater pushbutton control module
Coolant circulation pump
Duovalve
Air conditioning (Tempmatic):
A/C pushbutton control module (Tempmatic A/C)
Coolant circulation pump
Duovalve
Air conditioning (automatic):
A/C pushbutton control module (automatic A/C)
Emissions sensor (up to 31.5.98)
31 7,5 up to 31.5.98: Right low beam headlamp
15 as of 1.6.98: Right low beam
32 7,5 up to 31.5.98: Left low beam headlamp
15 as of 1.6.98: Left low beam
33 7,5 Right high beam headlamp
34 7,5 Left high beam headlamp
High beam indicator
35 15 Left and right fog lamps
Headlamp switch-off (USA)
36
37 25 as of 1.6.98: Heater booster
40 as of 1.6.99: For ESP (Bosch) return pump (M112, M113)
38 30 Auxiliary fan (engines 111, 112, 601, 604, 605 with automatic air conditioning)
40 Electric fan 380W (engine 111 with automatic air conditioning), M112 USA/Japan
60 550 W electric suction-type fan for engines 112, 611 with automatic air conditioning

Mercedes-Benz C-Class w202 - fuse box diagram - engine compartment

Number A Description
39
40 10 Fanfare horns
41 15 Turn signal lamps
Turn signal indicator
Fanfare horns
Windshield wiper
Windshield washer pump
Rain sensor
Rear window defroster
Engine fan
Residual engine heat utilization system
Headlamp cleaning system
Hazard warning flashers
42 7,5 Windshield washer water heater
43 7,5 Windshield washer pump
44 40 Windshield wiper Rain senso
45 15 Headlamp cleaning system

Fuse box in the trunk (up to 30.11.94)

Mercedes-Benz C-Class w202 - fuse box diagram - trunk

Number A Description
1 25 Left front power seat switch:
Head restraint
Backrest
Seat height
2 25 Right front power seat switch:
Seat height
Seat forward/back
3 25 Left front power seat switch:
Seat height
Seat forward/back
4 25 Right front power seat switch:
Head restraint
Backrest
Seat height
5 25 Sound system: Amplifier (left/right speakers) control module
6 7,5 CD player with change
7 30 Convenience control module: Power windows, tilting/sliding roof – Rear power windows
8
9 7,5 Convenience relay
Convenience control module: Power windows, tilting/sliding roof
10 30 Convenience control module: Power windows, tilting/sliding roof – Front power windows
11 7,5 ATA control module
Towing sensor control module
12 20 Front heated seat (HS) control module
13 20 Tilting/sliding roof
14
15
16
17 7,5 Telephone transmitter/receiver
18 25 Socket, trailer coupling, 13-pin
Fuel pumps relay
19

Fuse box in the trunk (as of 1.12.94)

Mercedes-Benz C-Class w202 - fuse box diagram - trunk

Number A Description
1 25 up to 31.5.97: Sound system: Amplifier (left/right speakers) control module
as of 1.6.97: Fuel pump
2 7,5 Injection system
30 as of 1.6.97:
Pneumatic system equipment (PSE):
Central locking (pump)
Headlamp, terminal 56b for anti-theft alarm (ATA)
3 20 up to 31.5.97:
ATA control module
Towing sensor control module
Infrared remote control (as of 1.12.94 up to 31.8.96)
30 as of 1.6.97: Front driver-side door control module
4 7,5 as of 1.12.94 up to 31.8.96: Automatic antenna, sedans
40 as of 1.6.97:
Pneumatic system equipment (PSE):
Rear window defroster
Central locking
Alarm horn for anti-theft alarm (ATA)
5 7,5 up to 31.5.97:
Left front door entrance/exit lamp
Right front door entrance/exit lamp
30 as of 1.6.97: Rear driver-side door control module
6 25 up to 31.5.97: Socket, trailer coupling, 13-pin
5 as of 1.6.97:
Rear dome lamp
Trunk lamp
Seat adjustment relay
Rear dome lamp (taxi)
7 30 up to 31.5.97: Convenience control module: Power windows, tilting/sliding roof – Rear power windows
5 as of 1.6.97:
For ATA:
ATA inclination sensor
Left infrared transmitter and receiver (interior protection system)
Right infrared transmitter and receiver (interior protection system)
Alarm signal siren with additional battery
8 30 up to 31.5.97: Convenience control module: Power windows, tilting/sliding roof – Front power windows
10 as of 1.6.98 up to 31.5.99: Emergency call system
as of 1.6.99:
Emergency call system (except USA)
E-call control module
E-call telephone
9 20 up to 31.5.97: Tilting/sliding roof
as of 1.6.98: Official vehicles
10 25 Left front power seat switch:
Rear seat height
Head restraint up/down
Backrest
11 25 Left front power seat switch:
Seat forward/back
Front seat height
12 25 Right front power seat switch:
Seat forward/back
Front seat height
13 25 Right front power seat switch:
Rear seat height
Head restraint up/down
Backrest
14 Rear heated seat (as of 1.12.94 up to 31.5.97)
15 Spare
16 Spare
17 Spare

Relay box

Mercedes-Benz C-Class w202 - fuse box diagram - relay box

Number Relay
A O2S 2 (after TWC) heater relay module
B ASR charging pump relay module (up to 11/94)
AIR relay module
C Auxiliary fan relay module (stage 1) (11/94-08/95)
Reserve (as of 09/95)
C+D Auxiliary fan relay module (Stage 1 [up to 11/94] and 2)
Auxiliary fan relay (stage 1) (up to 11/94)
Auxiliary fan relay (stage 2) (up to 11/94)
D Auxiliary fan relay module (stage 2) (11/94-08/95)
Reserve (as of 09/95)
E HCS relay module
F Horn relay module
G Separation relay module (terminal 56/56b, daytime running lamps) (Canada)
H High-pressure/return pump relay (as of 06/94)
K Combination relay (turn/hazard signal, heated rear window, wiper motor)
L Exterior lamp failure monitoring module

Engine 111

Mercedes-Benz C-Class w202 - fuse box diagram - engine 111

Number Description
A1e26 “CHECK ENGINE” MIL
K1/2 Overvoltage protection relay module (9-pole)
K17 AIR relay module
K27 Fuel pump relay module
K35 O2S 2 (after TWC) heater relay module
N3/4 Engine control module (HFM-SFI)
X11/4 Data link connector (DTC readout)
Y3/3 Upshift delay switchover valve

Engine

Mercedes-Benz C-Class w202 - fuse box diagram - engine

Number Description
N3/4 HFM Engine Controller
K1/2 Overvoltage Protection Relay
K27 Fuel Pump(s) Relay

WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

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