Mercedes W205 is the fourth generation of C-class cars of the German automaker Mercedes-Benz, which was produced in 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 with various body options: S205 station wagon, w205 sedan, c205 coupe and A205 convertible. During this time, the model was restyled. In this publication, you can find a description of the fuses and relays of the Mercedes w205 with block diagrams, photo examples of execution and location. Let’s highlight the fuse responsible for the cigarette lighter.

The design of the blocks and the purpose of the elements in them may differ from that shown and depends on the year of manufacture and the level of equipment of your car.

Blocks in the cabin

Block in panel

In the passenger compartment, the fuse and relay block is located on the left end of the instrument panel (on the parent side) behind a protective cover.

Description

20050A Front SAM Control Unit
20140A Front SAM Control Unit
2025A Alarm Siren
A205: EDW/Towaway Protection/Interior Monitoring Control Unit
20320A Valid for vehicles with gearbox 716: Electric steering column lock control unit
2045A Diagnostic socket
2057.5A Electronic ignition switch control unit
2065A Analog Clock
20715A HVAC Control Unit
2087.5A Instrument cluster
2095A Air Conditioning Control Panel
Upper control panel control unit
2105A Signals from the electronic steering column module control unit
21125A AMG: Signals from the ESP electronic stability control unit
2125A Antenna Switch for Telephone and Autonomous Heater
2135A Signals from the ESP electronic stability control unit
21430A AMG: Electric parking brake control unit
215Reserve
2167.5A Glove box light
2175A Japan: DSRC Toll Data Communication Control Unit
2187.5A Supplemental Restraint System Control Unit
2195A Weight Sensing System Control Unit
220Reserve
Relay
FRelay terminal 15R

Power fuse box

A high-power fuse box may be installed in the front passenger’s footwell.

Description

  1. Engine compartment power fuse box
  2. 150A Hybrid: Additional battery relay for ECO Start-Stop function
  3. 40A Fan Controller
  4. Reserve
  5. 150A For vehicles with diesel engine: Additional electric heater
  6. 80A Fuse Box A-Pillar Right
  7. 150A Rear Fuse and Relay Module
  8. Reserve
  9. Reserve
  10. 60A Valid for vehicles with transmission 725: Control unit for fully integrated transmission management 100A Hybrid with transmission 724: Control unit for fully integrated transmission management
  11. Reserve
  12. 40A Rear Fuse and Relay Module
  13. 50A Fuse Box Pillar A Right
  14. F32/4k2 – Quiescent current cut-off relay

Location of additional elements

  • F96 – Fuses for terminal 30 of the additional battery
  • F96/1 – Fuses terminal 87 flap in the exhaust tract

Block under the panel

Under the instrument panel, on the passenger side, on the pillar behind the protective cover, there is another block with fuses.

Designation

3015A Hybrid: Pyro fuse (F63) via high voltage disconnecting device
30230A Front Right Door Control Unit
30330A W205, S205, V205: Rear left door control unit
A205, C205: Rear compartment systems control unit
30420A Valid for vehicles with gearbox 722: Automatic transmission servo drive module for DIRECT SELECT system
30530A Driver Seat Control Unit
Driver’s seat heating control unit (before 31.05.2015)
Front seat heating control unit (from 01.06.2015)
30630A Front Passenger Seat Control Module
Front passenger seat heating control unit (before 31.05.2015)
Front seat heating control unit (from 01.06.2015)
3075A AMG: Active engine mount control unit
30830A USA: Electrical plug connection for Elektric-Brake-Control function
30910A Emergency Call System Control Unit
5A HERMES Control Unit
Communication module of telecommunication services
31020A AMG: Active engine mount control unit
31110A Electronic control for additional rear passenger compartment fan
31210A Ceiling Control Panel
31310A Hybrid: Power Electronics Control Unit
3145A AMG: Electronic differential control unit
3155A Transmission Control Unit
On vehicles with a diesel engine: CDI control unit
For vehicles with a petrol engine: ME control unit
3167.5A Supplemental Restraint System Control Unit
31730A Panoramic sliding sunroof control module (panoramic sliding sunroof)
Sliding Sunroof Control Module (Sliding Sunroof)
31820A Autonomous Heater Control Unit
3195A Hybrid: High Voltage Electric Heater System
32025A AIRMATIC control unit
Adaptive damping system control unit
3215A Japan: DSRC Toll Data Communication Control Unit
32220A Head Unit
3235A Parking assistance control unit
MF1/17.5A Display audio system/ COMAND
Audio Fan Motor (COMAND APS)
MF1/27.5A Multifunctional Camera Mono
Multifunctional stereo camera
MF1/37.5A Rain and Light Sensor with Additional Functions
W205, S205, V205: Ceiling control panel
MF1/47.5A Driver Seat Control Unit
Driver’s seat heating control unit (before 31.05.2015)
Front seat heating control unit (from 01.06.2015)
MF1/57.5A Front Passenger Seat Control Unit
Front passenger seat heating control unit (before 31.05.2015)
Front seat heating control unit (from 01.06.2015)
MF1/67.5A Signals from the electronic steering column module control unit
MF2/15A Front Left Reversible Seat Belt Tensioner
MF2/25A Audio control panel/COMAND
Touch panel (radio receiver Audio 20 or COMAND APS)
MF2/35A Front Right Reversible Seat Belt Tensioner
MF2/45A Head-up Display
MF2/55A Multimedia Device Connection Module
MF2/65A Hybrid: Electric Air Conditioning Compressor
MF3/15A Front SAM Control Module Terminal 30g Reverse Sense Wire
MF3/25A Radar Sensor Control Unit
MF3/3Reserve
MF3/45A Driver side instrument panel button block
MF3/55A Rear air conditioning control panel
MF3/65A Tire pressure monitoring system control unit

Blocks under the hood

Fuse and relay box

In the engine compartment, under the hood on the left side, there is a main block with fuses and relays.

Purpose

10040A Hybrid: Vacuum Pump
10115A Except AMG: Cable end sleeve terminals 87/2
20A AMG: Cable end sleeve terminal 87/2
10220A Except AMG: Cable end sleeve terminals 87/1
25A AMG: Cable end sleeve terminal 87/1
10315A Except AMG: Cable end sleeve terminals 87/4
20A AMG: Cable end sleeve terminal 87/4
10415A Except AMG: Cable end sleeve terminals 87/3
20A AMG: Cable end sleeve terminal 87/3
10515A Valid for vehicles with gearbox 722.9 (except 722.930): Control unit for additional transmission oil pump
106Reserve
10760A Valid for engine 274.9: Electric coolant pump
10820A LED Static Lights:
Front right headlight
High Performance LEDs or LED dynamic headlights:
Front left headlight
Front right headlight
10930A Windscreen Wiper Motor
11020A LED Static Lights:
Front left headlight
High Performance LEDs or LED dynamic headlights:
Front left headlight
Front right headlight
11130A Starter
11215A Hybrid: Accelerator Pedal Position Sensor
113Reserve
11440A AIRMATIC Compressor
11515A Horn left and horn right
116Reserve
117Reserve
1185A Hybrid: Signals from the ESP electronic stability control unit
11915A Cable End Sleeve Terminal 87 C2
1205A Except AMG: Cable end sleeve terminals 87 C1
15A AMG: Cable end sleeve terminal 87 C1
1215A Signals from the ESP electronic stability control unit
1225A Реле CPC
123Reserve
124Reserve
1255A Front SAM Control Unit
1265A Transmission Control Unit
On vehicles with a diesel engine: CDI control unit
For vehicles with a petrol engine: ME control unit
1275A Hybrid: Voltage Dropout Suppressor
1285A Front left headlamp and exterior lighting switch
12930A Hybrid: Starter Terminal 50 Relay
129A30A Hybrid: Starter Terminal 50 Relay
Relay
GRelay terminal 15, engine compartment
HStarter terminal 50 relay
IHybrid: Vacuum Pump Relay (+)
JCPC relay
KValid for vehicles with gearbox 722.9 (except 722.930): Oil pump relay
LHorn relay
MWindscreen wiper heating relay
NRelay terminal 87M
THEHybrid: Starter Terminal 15 Relay
PValid for engine 274.9: Coolant pump relay
QHybrid: Vacuum Pump Relay (-)
RAIRMATIC relay

Power fuse box

Photo example

Option 1

Scheme

Option 2

Scheme

General explanation

1Reserve
2100A On vehicles with diesel engine: Glow plug output stage module
360A Engine Fuse and Relay Module
4On-board network battery connector
5150A Engine Fuse and Relay Module
6125A Fuse and Relay Module, Left
780A Fan Motor
8125A Electric Power Steering Control Unit
9150A Fan Motor (1000W)
10200A Passenger Compartment Fuse Box
11Reserve
12Hybrid: Power Electronics Control Unit
USA: Catalyst Heater Control Unit
13400A Generator
C1Hybrid: Trip relay
C2Hybrid: Terminal 31
C3/140A Signals from the ESP electronic stability control unit
C3/260A Signals from the ESP electronic stability control unit
F32/3k1Isolation relay

Block in the trunk

Another fuse and relay box is located in the trunk under the protective cover.

Option 1

Scheme

Option 2

Scheme

Description

40025A AdBlue® Control Unit
40115A AdBlue® Control Unit
40220A AdBlue® Control Unit
40330A Before 11/30/2015: Front passenger seat semi-electric adjustment switch
25A From 01.12.2015: Switch for partially electric adjustment of front passenger seat position
40430A Before 11/30/2015: Driver’s seat partially electric adjustment switch
25A From 01.12.2015: Switch for partially electric adjustment of driver’s seat position
405Reserve
40630A Front Left Door Control Unit
407Reserve
40830A W205, S205, V205: Rear right door control unit
A205, C205: Rear compartment systems control unit
409Reserve
41015A Receiver for remote control of independent heater
41130A Front Left Reversible Seat Belt Tensioner
4127.5A Hybrid: Battery Management System Control Unit
4135A Tailgate Drive Control Unit
4145A Tuner module (TV tuner, digital radio (DAB)) or satellite radio SIRIUS)
4155A Chamber Lid Control Unit
Air freshener generator
4167.5A Mobile Antenna Amplifier/Compensator
Mobile phone contact board
4175A 360° Camera Control Unit
Rear view camera
4185A Rear seat heating control unit
AIRSCARF system control unit
4195A Front passenger seat lumbar support adjustment control unit
4205A Driver’s seat lumbar support adjustment control unit
421Reserve
422Reserve
4235A Speaker Amplifier Control Unit
42415A Valid for vehicles with engine 276: Motorsound control unit
425Reserve
426Reserve
427Reserve
428Reserve
429Reserve
430Reserve
43125A Multifunctional control unit for special vehicles
43225A Multifunctional control unit for special vehicles
43315A Trailer Recognition Control Unit
43415A Trailer Recognition Control Unit
30A AMG: Electric parking brake control unit
43525A Trailer Recognition Control Unit
25A AMG: Electronic differential control unit
43615A Trailer Recognition Control Unit
43725A Trailer Recognition Control Unit
43830A AC/DC Converter Control Unit
4395A Taximeter
Taximeter in the interior rearview mirror
25A A205: Rear compartment systems control unit
44030A Rear seat heating control unit
AIRSCARF system control unit
44130A AIRSCARF system control unit
44225A Fuel Pump Control Unit
44330A Front Right Reversible Seat Belt Tensioner
44415A Tablet Computer Electrical Plug Connection
44515A S205: Socket in the trunk
44615A Cigarette lighter with illuminated ashtray front (socket inside)
44715A 12V socket in the rear right center console
44810A Valid for vehicles with gearbox 722, 725: Parking lock capacitor
4495A Valid for vehicles with engine 626: Fuel filter element with integrated heating
AMG: Electric parking brake control unit
4505A Rear SAM Control Unit
4515A Fuel Pump Control Unit
AdBlue® Control Unit
4525A Integrated radar sensor rear bumper outside right
Integrated radar sensor rear bumper outside left
Radar sensor in the rear bumper in the center
Radar sensor in the rear bumper on the right outside
Radar sensor in the rear bumper on the left outside
4535A Radar sensor in the front bumper on the left
Radar sensor in the front bumper, right
COLLISION PREVENTION ASSIST control module
4547.5A Valid for vehicles with gearbox 722: Control unit for fully integrated automatic transmission control system
5A Package for driving schools:
Footwell Light Switch
Pedal Pressure Monitoring Sensor
Valid for type 253: AdBlue® control unit
4555A AC/DC Converter Control Unit
4565A Front Far-Range Radar Sensor
Electrical control module DISTRONIC
4575A Hybrid:
Power electronic equipment control unit
Battery management system control unit
AMG:
Electronic differential control unit
Active Engine Mount Control Unit
4585A Keyless trunk lid opening module under rear bumper
4595A Hybrid: Charger
AMG: AMG Chassis Control Unit
46010A kEyLESS-GO Control Unit
4615A Antenna amplifier FM 1, AM, CZ and KEYLESS-GO
46240A Speaker Amplifier Control Unit
46330A W205, S205, V205: Rear window heating (R1) via rear window noise suppression capacitor
A205, C205: Electrical plug connection soft top/vehicle interior
46440A Tailgate Drive Control Unit
Control unit for tailgate drive
46540A Rear SAM Control Unit
46640A Rear SAM Control Unit
46740A Valid for vehicles with engine 626: Fuel filter element with integrated heating
A205: Rear compartment systems control unit
Relay
STerminal 15 interior relay
TRear window heating relay
INRelay for cup holder and sockets 2nd row of seats
INAdBlue ® relay
XRelay for the refrigeration box and sockets for the 1st row of seats/trunk
ANDBackup relay
ZR1Valid for vehicles with engine 626: Fuel filter heating relay
ZR2Backup relay
ZR3Backup relay