Mercedes-Benz C-Class Fuse Box Locations and Diagrams (2015-2021)

The fourth-generation Mercedes-Benz C-Class (W205), produced from 2015 to 2021, brought advanced technology, refined design, and expanded powertrain options to the compact executive segment. Models include C180, C200, C220, C250, C300, C350, C400, C450, and C63 AMG, each offering a balance of efficiency, luxury, and performance.

In this article, you will find fuse box diagrams for the Mercedes-Benz C-Class W205 for model years 2015, 2016, 2017, 2018, 2019, 2020, and 2021. You will also get detailed fuse layouts, providing information about the assignment of each fuse and relay across various systems in the vehicle.

What This Guide Covers:

Fuse Box Diagrams – Clear illustrations showing the location and numbering of fuses and relays.
Fuse Panel Locations – Information about where each fuse box is located in the car, typically found in the engine compartment, under the dashboard, and in the trunk.
Fuse Assignments – Comprehensive listings of what each fuse and relay controls — from lighting, infotainment, and climate control to safety systems and engine components.

Whether you’re troubleshooting electrical issues or replacing a specific fuse, this guide offers the essential information to maintain and repair the electrical systems of your Mercedes-Benz C-Class (W205) effectively.

Instrument Panel Fuse Box

Fuse box location

The fuse box is located on the edge of the instrument panel, on the driver’s side, behind the cover.

The location of the fuses in the passenger compartment: Mercedes-Benz C-Class (2015-2019-..)

Fuse box diagram

Assignment of the fuses in the instrument panel

Premium fuse data

Full access is available to registered users — log in or register to unlock this content.

№	Fused component	Amp
200	Front SAM control unit	50
201	Front SAM control unit	40
202	Alarm siren ATA [EDW]/tow-away protection/interior protection control unit (A205)	5
203	Valid with transmission 716: Electric steering lock control unit	20
204	Diagnostic connector	5
205	Electronic ignition lock control unit	7.5
206	Analog clock	5
207	Climate control control unit	15
208	Instrument cluster	7.5
209	Climate control operating unit Upper control panel control unit	5
210	Steering column tube module control unit	5
211	AMG: Electronic Stability Program control unit	25
212	as of 01.06.2016: Antenna changeover switch for telephone and stationary heated	5
213	Electronic Stability Program control unit	5
214	AMG: Electric parking brake control unit	30
215	Spare	–
216	Glove compartment lamp	7.5
217	Japan version: Dedicated Short-Range Communications control unit	5
218	Supplemental Restraint System control unit	7.5
219	Weight sensing system (WSS) control unit	5
220	Spare	–

	Relay
F	Relay, circuit 15R

Front-Passenger Footwell Fuse Box

Fuse box location

Fold cover (1) out towards the rear and remove it.

Fuse box diagram

Assignment of the fuses in the Front-Passenger Footwell Fuse Box

Premium fuse data

Full access is available to registered users — log in or register to unlock this content.

№	Fused component	Amp
301	Hybrid: Pyrofuse via high-voltage disconnect device	5
302	Right front door control unit	30
303	W205, S205, V205: Left rear door control unit A205, C205: Rear control unit	30
304	Valid for transmission 722: Intelligent servo module for DIRECT SELECT	20
305	Driver seat control unit Driver seat heater control unit Front seat heater control unit	30
306	Front passenger seat control unit Front passenger seat heater control unit Front seat heater control unit	30
307	AMG: Active engine mounts control unit	5
308	USA version: Electric Brake Control electrical connector	30
309	Emergency call system control unit	10
309	HERMES control unit Telematics services communications module	5
310	AMG: Active engine mounts control unit	20
311	Booster blower electronic blower regulator	10
312	Overhead control panel control unit	10
313	Hybrid: Power electronics control unit	10
314	AMG: Electronic differential control unit	5
315	Powertrain control unit Valid for diesel engine: CDI control unit Valid for gasoline engine: ME-SFI control unit	5
316	Supplemental Restraint System control unit	7.5
317	Panoramic sliding sunroof control module Sliding roof control module	30
318	Stationary heater control unit	20
319	Hybrid: High-voltage PTC heater	5
320	AIRMATIC control unit Adaptive damping system control unit	25
321	Japan version: Dedicated Short-Range Communications control unit	5
322	Head unit	20
323	Parking system control unit	5
MF1/1	Audio/COMAND display Audio equipment fan motor	7.5
MF1/2	Stereo multifunction camera Mono multifunction camera	7.5
MF1/3	Rain/light sensor with additional functions W205, S205, V205: Overhead control panel control unit	7.5
MF1/4	Driver seat control unit Driver seat heater control unit Front seat heater control unit	7.5
MF1/5	Front passenger seat control unit Front passenger seat heater control unit Front seat heater control unit	7.5
MF1/6	Steering column tube module control unit	7.5
MF2/1	Left front reversible emergency tensioning retractor	5
MF2/2	Audio/COMAND control panel Touchpad	5
MF2/3	Right front reversible emergency tensioning retractor	5
MF2/4	Heads-up display	5
MF2/5	Multimedia connection unit	5
MF2/6	Hybrid: Electrical refrigerant compressor	5
MF3/1	Feedback line, terminal 30g, front SAM control unit	5
MF3/2	Radar sensors control unit	5
MF3/3	Spare	–
MF3/4	Driver side instrument panel button group	5
MF3/5	Rear air conditioning operating unit	5
MF3/6	Tire pressure monitor control unit	5

Interior Pre-Fuse Box

Fuse box location

Fuse box diagram

Interior Pre-Fuse Box

Premium fuse data

Full access is available to registered users — log in or register to unlock this content.

№	Fused component	A
1	Engine compartment prefuse box	–
2	Hybrid: Additional battery relay for ECO start/stop function	150
3	Blower regulator	40
4	Spare	–
5	Valid for diesel engine: PTC heater booster	150
6	Right A-pillar fuse box	80
7	Rear fuse and relay module	150
8	Spare	–
9	Spare	–
10	Valid for transmission 722, 725: Fully integrated transmission control unit	60
10	Hybrid: Fully integrated transmission control unit	100
11	Spare	–
12	Rear fuse and relay module	40
13	Right A-pillar fuse box	50
F32/4k2	Quiescent current cutout relay
F96	Additional battery circuit 30 fuses
F96/1	Exhaust flaps circuit 87 fuses

Engine Compartment Fuse Box

Fuse box location

The fuse box is located in the engine compartment (left-side), under the cover.Press safety clips (1) on the cover together, remove fuse box cover (2) upwards.

The location of the fuses in the engine compartment: Mercedes-Benz C-Class (2015-2019-..)

Fuse box diagram

Assignment of the fuses and relay in the engine compartment

Premium fuse data

Full access is available to registered users — log in or register to unlock this content.

№	Fused component	Amp
100	Hybrid: Vacuum pump	40
101	Valid except AMG: Connector sleeve, circuit 87/2	15
101	AMG: Connector sleeve, circuit 87/2	20
102	Valid except AMG: Connector sleeve, circuit 87/1	20
102	AMG: Connector sleeve, circuit 87/1	25
103	Valid except AMG: Connector sleeve, circuit 87/4	15
103	AMG: Connector sleeve, circuit 87/4	20
104	Valid except AMG: Connector sleeve, circuit 87/3	15
104	AMG: Connector sleeve, circuit 87/3	20
105	Valid for transmission 722.9 (except 722.930): Automatic transmission fluid auxiliary oil pump control unit	15
106	Spare	–
107	Valid with engine 274.9: Electric coolant pump	60
108	Static LED headlamp: Right front lamp unit High performance LED, Dynamic LED headlamp: Left front lamp unit, Right front lamp unit	20
109	Wiper motor	30
110	Static LED headlamp: Left front lamp unit	20
110	High performance LED, Dynamic LED headlamp: Left front lamp unit, Right front lamp unit
111	Starter	30
112	Hybrid: Accelerator pedal sensor	15
113	Spare	–
114	AIRmatic compressor	40
115	Left horn and right horn	15
116	Spare	–
117	Spare	–
118	Hybrid: Electronic Stability Program control unit	5
119	Circuit 87 C2 connector sleeve	15
120	Valid except AMG: Circuit 87 C1 connector sleeve	5
120	AMG: Circuit 87 C1 connector sleeve	15
121	Electronic Stability Program control unit	5
122	CPC relay	5
123	Spare	–
124	Spare	–
125	Front SAM control unit	5
126	Powertrain control unit Valid for diesel engine: CDI control unit Valid for gasoline engine: ME-SFI control unit	5
127	Hybrid: Voltage dip limiter	5
128	Left front lamp unit and exterior lights switch	5
129	Hybrid: Starter circuit 50 relay	30
129A	Hybrid: Starter circuit 50 relay	30

	Relay
G	Engine compartment circuit 15 relay
H	Starter circuit 50 relay
I	Hybrid: Vacuum pump relay (+)
J	CPC relay
K	Valid for transmission 722.9 (except 722.930): Oil pump relay
L	Horn relay
M	Wiper park position heater relay
N	Circuit 87M relay
O	Hybrid: Starter circuit 15 relay
P	Valid with engine 274.9: Coolant pump relay
Q	Hybrid: Vacuum pump relay (-)
R	AIRmatic relay

Engine Pre-Fuse Box

Version 1

Version 2

Engine Pre-Fuse Box

Premium fuse data

Full access is available to registered users — log in or register to unlock this content.

№	Fused component	Amp
1	Spare	–
2	Valid for diesel engine: Glow output stage	100
3	Engine fuse and relay module	60
4	On-board electrical system battery connection	–
5	Engine fuse and relay module	150
6	Left fuse and relay module	125
7	Fan motor (600 W / 850 W)	80
8	Electrical power steering control unit	125
9	Fan motor (1000 W)	150
10	Vehicle interior prefuse box	200
11	Spare	–
12	Hybrid: Power electronics control unit With engine 651.9 and USA version: Catalytic converter heater control unit	–
13	Alternator	400
Cl	Hybrid: Decoupling relay	–
C2	Hybrid: Circuit 31	–
C3/1	Valid except AMG: Electronic Stability Program control unit	40
C3/2	Electronic Stability Program control unit	60
F32/3k1	Decoupling relay

Luggage Compartment Fuse Box

Fuse box location

The fuse box is located in the luggage compartment (on the right-side), under the floor.Lift the trunk floor upwards, swing cover (1) upwards in the direction of the arrow.

The location of the fuses in the trunk: Mercedes-Benz C-Class (2015-2019-..)

Fuse box diagram

Version 1

Version 2

Assignment of the fuses and relay in the trunk

Premium fuse data

Full access is available to registered users — log in or register to unlock this content.

№	Fused component	Amp
1	Terminal 30 “E1” feed
2	Terminal 30g “E2” feed
400	BlueTEC: AdBlue® control unit	25
401	BlueTEC: AdBlue® control unit	15
402	BlueTEC: AdBlue® control unit	20
403	Valid up to 30.11.2015: Front passenger seat partially electric seat adjustment switch	30
403	Valid as of 01.12.2015: Front passenger seat partially electric seat adjustment switch	25
404	Valid up to 30.11.2015: Driver seat partially electric seat adjustment switch	30
404	Valid as of 01.12.2015: Driver seat partially electric seat adjustment switch	25
405	Spare	–
406	Left front door control unit	30
407	Spare	–
408	W205, S205, V205: Right rear door control unit A205, C205: Rear control unit	30
409	Spare	–
410	Stationary heater radio remote control receiver Antenna changeover switch for telephone and stationary heater	5
411	Left front reversible emergency tensioning retractor	30
412	Hybrid: Battery management system control unit	7.5
413	Trunk lid control control unit	5
414	Tuner unit	5
415	Camera cover control unit Perfume atomizer generator	5
416	Cellular telephone system antenna amplifier/compensator Mobile phone contact plate	7.5
417	360° camera control unit Reversing camera	5
418	Rear seat heater control unit AIRSCARF control unit	5
419	Front passenger seat lumbar support adjustment control unit	5
420	Driver seat lumbar support adjustment control unit	5
421	Spare	–
422	Spare	–
423	Sound system amplifier control unit	5
424	AIR BODY CONTROL Plus control unit Valid for engine 276: Engine sound control unit	15
425	Spare	–
426	Spare	–
427	Spare	–
428	Spare	–
429	Spare	–
430	Spare	–
431	Special-purpose vehicle multifunction control unit	25
432	Special-purpose vehicle multifunction control unit	25
433	Trailer recognition control unit	15
434	Trailer recognition control unit	15
434	AMG: Electric parking brake control unit	30
435	Trailer recognition control unit AMG: Electronic differential control unit	25
436	Trailer recognition control unit	15
437	Trailer recognition control unit	25
438	DC/AC converter control unit	30
439	Taximeter Mirror taximeter	5
439	A205: Rear control unit	25
440	Rear seat heater control unit AIRSCARF control unit	30
441	AIRSCARF control unit	30
442	Fuel system control unit	25
443	Right front reversible emergency tensioning retractor	30
444	Tablet PC electrical connector	15
445	S205: Luggage compartment socket	15
446	Front cigarette lighter with ashtray illumination Vehicle interior power outlet	15
447	Right rear center console socket 12V	15
448	Valid for transmission 722, 725: Park pawl capacitor	10
449	Valid for engine 626: Fuel filter element with integrated heater AMG: Electric parking brake control unit	5
450	Rear SAM control unit	5
451	Fuel system control unit BlueTEC: AdBlue® control unit	5
452	Integrated outer right rear bumper radar sensor Integrated outer left rear bumper radar sensor Center rear bumper radar sensor Outer right rear bumper radar sensor Outer left rear bumper radar sensor	5
453	Left front bumper radar sensor Right front bumper radar sensor COLLISION PREVENTION ASSIST controller unit	5
454	Valid for transmission 722: Fully integrated transmission control unit	7.5
454	Driving school package: Footwell illumination switch Pedal operation monitor switch BlueTEC: AdBlue® control unit	5
455	DC/AC converter control unit	5
456	Front long-range radar sensor DISTRONIC electric controller unit	5
457	Hybrid: Power electronics control unit Battery management system control unit AMG: Electronic differential control unit Active engine mounts control unit	5
458	Rear switching module	5
459	Hybrid: Charger AMG: AMG suspension control unit	5
460	KEYLESS-GO control unit	10
461	FM 1, AM, CL [ZV] and KEYLESS-GO antenna amplifier	5
462	Sound system amplifier control unit	40
463	W205, S205, V205: Rear window heater via rear window interference suppression capacitor A205, C205: Soft top/vehicle interior electrical connector	30
464	Trunk lid control control unit Liftgate control control unit	40
465	Rear SAM control unit	40
466	Rear SAM control unit	40
467	Valid for engine 626: Fuel filter element with integrated heater A205: Rear control unit	40

	Relay
S	Vehicle interior circuit 15 relay
T	Rear window heater relay
U	2nd seat row cup holder and sockets relay
V	BlueTEC: AdBlue® relay
X	1 st seat row/trunk refrigerator box and sockets relay
Y	Spare relay
ZR1	Valid for engine 626: Fuel filter heater relay
ZR2	Reserve relay
ZR3	Reserve relay