The third-generation Mercedes-Benz SLK-Class / SLC-Class (R172), produced from 2011 to 2020, is a luxury retractable hardtop roadster known for its sporty performance, elegant styling, and advanced technology. The SLK was later renamed SLC as part of Mercedes-Benz’s updated naming strategy, maintaining its reputation for dynamic driving and open-top enjoyment.
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Looking for the right fuse or relay?
Search common fuse types, fuse kits and relay options for your vehicle.
In this article, you will find fuse box diagrams for the Mercedes-Benz SLK-Class and SLC-Class, covering models SLK200, SLK250, SLK350, SLK55, SLC180, SLC200, SLC250, SLC300, and SLC43 for the years 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, and 2020. These diagrams provide essential insights into the fuse layout, helping vehicle owners, mechanics, and technicians locate and understand the function of each fuse and relay.
What’s Included:
Fuse Box Diagrams – Clear and detailed visuals to help identify fuses, relays, and circuit breakers.
Fuse Panel Locations – Step-by-step guidance on where to find the fuse panels inside the Mercedes-Benz SLK / SLC.
Fuse Assignments – Comprehensive descriptions of each fuse and relay function for accurate diagnostics and troubleshooting.
Whether you’re searching for the fuse panel layout, replacing a blown fuse, or diagnosing an electrical issue, this guide is an essential resource. It ensures that your Mercedes-Benz SLK / SLC’s electrical system remains functional and reliable for spirited driving, long road trips, and top-down cruising.
Keep your Mercedes-Benz SLK-Class / SLC-Class (2011–2020) performing at its best with this detailed fuse box, fuse panel, and relay guide!
The cigar lighter (power outlet) fuse in the Mercedes-Benz SLK/SLC-Class is:
fuse â„–9 (Front Interior Socket, Cigarette Lighter), located in the Engine Compartment Fuse Box.
Headlamp control unit (up to model year 2017) Valid for diesel engine: Fuel filter condensation sensor with heating element (up to model year 2017)
20
5
Rear SAM control unit with fuse and relay module Electrohydraulic power steering via engine compartment/FFS electrical connector (as of model year 2017) Exterior lights switch (as of model year 2017)
7.5
6
Valid for diesel engine: CDI control unit Valid for gasoline engine: ME-SFI control unit
10
7
Starter via starter circuit 50 relay
20
8
Supplemental Restraint System control unit
7.5
9
Vehicle interior socket, front Cigarette lighter with ashtray illumination
15
10
Wiper motor Wiper park position heater (up to model year 2017)
30
11
Audio/COMAND display Audio/COMAND control panel
7.5
12
ACC control and operating unit Overhead control panel control unit Steering column tube module control unit (as of model year 2017)
7.5
13
Steering column tube module control unit Multifunction camera
7.5
14
Electronic Stability Program control unit
7.5
15
Supplemental Restraint System control unit
7.5
16
Radio fan electrical connector (as of model year 2017) Valid with transmission 725: DIRECT SELECT INTERFACE (as of model year 2017) Navigation module electrical connector (up to model year 2017)
5
16
Valid for transmission 722: Electronic selector lever module control unit Valid with transmission 725: DIRECT SELECT INTERFACE
7.5
17
Left front lamp unit and right front lamp unit
30
17
Valid up to 31.05.2012: Overhead control panel control unit
7.5
18
Upper control panel control unit Overhead control panel control unit Backup relay (up to model year 2017)
7.5
19
Valid with transmission 725: Electronic ignition lock control unit Valid for manual transmission: Electronic ignition lock control unit Electric steering lock control unit
20
20
Electronic Stability Program control unit
40
21
Glove compartment lamp
7.5
22
Fan motor for internal combustion engine and air conditioning with integrated control (as of model year 2017) Valid for engine 152, 271, 274, 276, 651: Electrical connector for interior harness and engine wiring harness Valid for engine 276, 651: Engine compartment/vehicle interior electrical connector Valid for engine 152, 271, 276, 651: Circuit 87 M2e connector sleeve Valid for engine 274: Connector sleeve, circuit 87/2 Valid for diesel engine: CDI control unit Engine compartment/FFS [RBA] electrical connector (up to model year 2017)
15
23
Valid for engine 152, 271, 274, 276: Electrical connector for interior harness and engine wiring harness Valid for diesel engine: Quantity control valve Circuit 87 M1e connector sleeve (as of model year 2017) Valid for engine 276: Engine compartment/vehicle interior electrical connector (up to model year 2017)
20
24
Valid for engine 152, 271, 274, 276: Electrical connector for interior harness and engine wiring harness Valid for engine 274: Coolant circulation pump relay Valid for diesel engine: Engine compartment/vehicle interior electrical connector CDI control unit (up to model year 2017) China vehicles: Radiator shutters actuator (as of model year 2017)
15
25
Valid for engine 276: Circuit 87 M4e connector sleeve Valid for engine 274: Circuit 87 M1 connector sleeve Valid for engine 152: Circuit 87 connector sleeve Valid for diesel engine: Oxygen sensor upstream of catalytic converter Valid for engine 651: (as of 01.06.2015) NOx sensor control unit downstream of diesel particulate filter NOx sensor control unit downstream of SCR catalytic converter
15
26
Left front lamp unit and right front lamp unit (as of model year 2017) Radio (up to model year 2017) COMAND controller unit (up to model year 2017)
20
27
Electronic ignition lock control unit Valid for diesel engine: CDI control unit Valid for gasoline engine: ME-SFI control unit
7.5
28
Instrument cluster Analog clock
7.5
29
Right headlamp range adjustment actuator motor (as of model year 2017) Right front lamp unit (up to model year 2017)
10
30
Left headlamp range adjustment actuator motor (as of model year 2017) Left front lamp unit (up to model year 2017)
10
31A
Left fanfare horn Right fanfare horn
15
31B
Left fanfare horn Right fanfare horn
15
32
Valid for engine 274: Electric air pump (as of model year 2017) Valid for engine 651: AdBlue® control unit
40
33
Valid for transmission 722: Fully integrated transmission control unit
10
34
Fuel system control unit Valid for engine 651: AdBlue control unit
7.5
35
Electronic Stability Program control unit Right outer rear bumper integrated radar sensor and left outer rear bumper integrated radar sensor (as of model year 2017)
5
36
COLLISION PREVENTION ASSIST controller unit (as of model year 2017) DISTRONIC electric controller unit Left front bumper DISTRONIC (DTR) sensor (up to model year 2017) Right front bumper DISTRONIC (DTR) sensor (up to model year 2017)
7.5
Relay
J
Circuit 15 relay
K
Circuit 15R relay
L
Reserve relay
M
Starter circuit 50 relay
N
Engine circuit 87 relay
O
Horn relay
P
Valid for engine 271, 274 or 651.9 as of 01.06.2015: Adblue/secondary air injection relay
Q
Valid up to 29.02.2016: Backup relay
R
Chassis circuit 87 relay
Engine Pre-Fuse Box
Fuse box location
Fuse box diagram
With ECO start/stop
Without ECO start/stop
Engine Pre-Fuse Box
Fuse Data
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Driver seat NECK-PRO head restraint solenoid Front passenger seat NECK-PRO head restraint solenoid
7.5
38
Spare
–
39
Left door control unit
30
40
Adaptive damping system control unit
15
41
Right door control unit
30
42
Fuel system control unit
25
43
Spare
–
44
Spare
–
45
Spare
–
46
FM, AM and CL [ZV] antenna amplifier FM 2, DAB and TV antenna amplifier (up to model year 2017) Alarm siren Interior protection sensor
7.5
47
Spare
–
48
Spare
–
49
Rear window heater
30
50
Right reversible emergency tensioning retractor
50
51
Left reversible emergency tensioning retractor
50
52
Spare
–
53
Spare
–
54
Spare
–
55
Spare
–
56
Spare
–
57
Spare
–
58
Spare
–
59
Electric parking brake control unit
5
60
Spare
–
61
AIRSCARF control unit
25
62
Driver seat control unit
30
63
AIRSCARF control unit
25
64
Front passenger seat control unit
30
65
Valid for transmission 722, 725 (ECO start/stop) (up to model year 2017) Electric oil pump
10
66
Spare
–
67
Sound system amplifier control unit
40
68
Engine sound control unit (as of model year 2017)
15
69
Radio (as of model year 2017) COMAND controller unit (as of model year 2017)
20
70
Tire pressure monitor control unit
5
71
Valid for engine 274: Left exhaust flap actuator motor (as of model year 2017)
7.5
72
Center console stowage compartment socket (up to model year 2017)
15
73
Valid for engine 274, 276: Charge air cooler circulation pump relay (as of model year 2017)
10
74
KEYLESS-GO control unit
7.5
75
Vario roof control control unit
20
76
MAGIC SKY CONTROL control unit
7.5
77
Cellular telephone system antenna amplifier / compensator
5
78
Media interface control unit (up to model year 2017)
7.5
79
Multimedia connection unit (as of model year 2017) Radar sensors control unit (up to model year 2017)
5
80
Parking system control unit
7.5
81
Mobile phone contact plate
5
82
Reversing camera (as of model year 2017)
5
83
Dedicated Short-Range Communications control unit (as of model year 2017) VICS and Electronic Toll Collection power supply electrical connector (up to model year 2017)
7.5
84
Digital Audio Broadcasting control unit (up to model year 2017) Satellite digital audio radio (SDAR) control unit (up to model year 2017)
5
85
Tuner unit (as of model year 2017) Digital TV tuner (up to model year 2017)
7.5
86
Camera cover control unit (as of model year 2017)
5
87
HERMES control unit (as of model year 2017) eCall Russia control unit (GLONASS) (as of model year 2017) Emergency call system control unit (up to model year 2017)
7.5
88
Internal supply of rear SAM control unit with fuse and relay module
80
89
Electric parking brake control unit
30
90
Electric parking brake control unit
30
91
Spare
–
92
Spare
–
Relay
A
Terminal 15 relay
B
Circuit 15R relay (1)
C
Heated rear window relay
D
Fuel pump relay
R
Spare
F
Seat adjustment relay
G
Circuit 15R relay (2)
ECO start/stop function additional battery relay
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