Fuses and relays Mercedes C-class (W204; 2007–2014)

The third-generation Mercedes-Benz C-Class made its world premiere in Stuttgart in January 2007. The W204 sedan features a highly refined aesthetic and improved aerodynamics. A large radiator grille, redesigned lighting assemblies, and a front bumper with enlarged air intakes give it a more aggressive stance. This article provides a comprehensive overview of the fuse box diagrams for the Mercedes-Benz C-Class W204 (3rd Gen; C180, C230, C280, C350, C63 AMG) covering the 2007, 2008, 2009, 2010, 2011, 2012, 2013, and 2014 model years.

Below you will find the locations and photographs of the power distribution boxes. The fuses protecting the “Cigarette Lighter” and “Fuel Pump” circuits are highlighted in bold.

Luggage Compartment

Location of the fuse box (sedan).

Location of the fuse box (estate/wagon).

Example of access.

General view.

Diagram
Models before June 2009
No.	Circuit / Component	A
F37	Supplemental Restraint System (SRS)	7.5
F38		15
F39	Left rear door control module	30
F41	Right rear door control module	30
F42		20
F44	Multifunction seat switch (front right)	30
F45	Multifunction seat switch (front left)	30
F46		7.5
F49	Rear window defroster	40
F50		50
F51		50
F53	Trailer control module	30
F54	Trailer control module
F56	Trailer control module	15
F57		20
F58		30
F59	Parking assist control module	7.5
F61	Tailgate/trunk lid power closing module	40
F67	Audio amplifier	40
F70	Tire Pressure Monitoring System (TPMS) control module	5
F71	Cigarette lighter fuse (Mercedes-Benz W204: C180, C230, C280, C350, C63 AMG)	15
F72		15
F74	Keyless entry and engine start control module	15
F76	Auxiliary power outlet	15
F79	Parking assist control module	7.5
F81	Audio interface control module	7.5
F83	Tele Aid / Emergency call system	7.5
F84	Audio system
F87	Tele Aid / Emergency call system	7.5
3	Rear window defroster relay
6	Power seat relay
Models after June 2009
No.	Circuit / Component	A
F37	Supplemental Restraint System (SRS)	5
F38		15
F39	Left rear door control module	30
F41	Right rear door control module	30
F42	Fuel pump control module (fuel pump fuse)	20
F43		7.5
F44	Multifunction seat switch (front right)	30
F45	Multifunction seat switch (front left)	30
F46		7.5
F49	Rear window defroster	40
F50	Supplemental Restraint System (SRS)	50
F51		50
F53	Trailer control module	30
F54	Trailer control module
F56	Trailer control module	15
F57		20
F58		20
F59	PARKTRONIC	5
F60	Multicontour seat pneumatic pump	7.5
F61	Tailgate/trunk lid power closing module	40
F62		30
F63		30
F65	Suspension control module	15
F67	Audio amplifier	30
F70	Tire Pressure Monitoring System (TPMS) control module	5
F71	Cigarette lighter fuse (Mercedes-Benz W204: C180, C230, C280, C350, C63 AMG)	15
F72		15
F73		7.5
F74	Keyless entry and engine start control module	15
F75	Auxiliary heater control module	20
F76	Auxiliary power outlet	15
F81	Audio interface control module	7.5
F82	Telephone	5
F83	Tele Aid / Emergency call system	7.5
F84		7.5
F87	Tele Aid / Emergency call system	7.5
F89		20
F91	Up to 06/2010: Not used
3	Rear window defroster relay
6	Power seat relay

Passenger Compartment

The power distribution box is located on the driver's side at the outer edge of the instrument panel, behind a protective cover.

Example of access.

Mercedes-Benz W204 Interior Fuse Box Diagram
No.	A	Description
116	30	Driver's seat control module (up to 05/31/2009)
117	15	Adaptive Damping System (ADS) control module (up to 05/31/2009)
118	-	Spare
119	7.5	Rear climate control blower motor (up to 05/31/2009)
		AMG Performance Media control module (up to 06/01/2012)
120	-	Spare
121	-
122	-
123	10	Steering column module
124	-	Spare
125	-
126	30	Front passenger seat control module (up to 05/31/2009)
127	-	Spare
128	-
129	20	Oil cooler fan motor relay (M156 engine; up to 05/31/2009)
130	-	Spare
131	-
132	-
133	-
134	-
135	-

Engine Compartment

The power distribution box is located on the upper right side of the engine compartment.

General view of the Mercedes-Benz C-Class W204 underhood fuse box.

Diagram
No.	Relay Description
J	Circuit 15 relay (ignition)
K	Circuit 15R relay (accessory)
L	Spare
M	Starter relay (Circuit 50)
N	Engine control relay (Circuit 87)
O	Horn relay
P	Secondary air injection pump relay
Q	Oil cooler fan relay
R	Chassis control relay (Circuit 87)
No.	A	Description
1	25	Electronic Stability Program (ESP) control module
2	30	Left front door control module
3	30	Right front door control module (up to 03/31/2010)
4	7.5	Fuel pump module (gasoline engines)
		Left fuel pump module (M156 engine)
		Right fuel pump module (M156 engine)
		Fuel filter water-in-fuel sensor and heater (OM642, OM651 engines)
		Fuel filter water-in-fuel sensor and heater control module (OM651 engine up to 05/31/2010, OM646 engine)
	20	Headlamp control module (from 03/01/2011)
5	7.5	Rear Signal Acquisition and Actuation Module (SAM)
		Rear differential cooling pump relay (M156 engine from 07/01/2011)
		Exterior lamp switch (from 12/01/2009)
6	10	CDI control module (diesel engines)
		ME-SFI control module (gasoline engines)
7	20	Starter
8	7.5	Supplemental Restraint System (SRS) control module
9	15	12V socket in the glove compartment
10	30	Windshield wiper motor
11	7.5	Audio display / COMAND
		Audio control panel / COMAND
		Navigation module cradle
12	7.5	Climate control module
		Upper control panel
13	7.5	Steering column module
		Multifunction camera (from 03/01/2011)
14	7.5	Electronic Stability Program (ESP) control module
15	7.5	Supplemental Restraint System (SRS)
		Passive safety systems
16	5	Data Link Connector (DLC) / OBD-II port (up to 05/31/2009)
		Cellular telephone pre-installation (up to 2008)
		Electronic Selector Lever Module (ESM) (722 transmission)
17	30	Panoramic roof control module
		Overhead control panel
18	7.5	Exterior lamp switch (up to 2008)
		Upper control panel (from 03/01/2011)
		LIN bus power distribution for climate control (up to 02/28/2011)
		Interior wiring harness connector for rear lighting
19	20	Electronic Steering Lock (ESL)
		Electronic Ignition Switch (EIS)
20	40	Electronic Stability Program (ESP) control module
21	7.5	Brake light switch
		Glove compartment illumination switch
		Front passenger seat occupancy sensor (AKSE / WSS)
		Electronic Toll Collection (ETC) system pre-installation (Japan)
22	15	Engine cooling fan module
		Engine and interior wiring harness connector
		Circuit 87 M2e terminal (M271 engine, South Korea; M272 engine, USA)
		ME-SFI control module (M271 engine; South Korea)
		Purge control valve (M271 engine, South Korea; M272 engine, USA)
		CDI control module (OM642, OM646 engines)
		Crankcase ventilation heater (OM642 engine)
		Circuit 87 terminal (OM646 engine)
23	20	Engine and interior wiring harness connector
		Rear SAM control module (diesel engines)
		CDI control module (diesel engines up to 2008)
		Circuit 87 terminal (diesel engines up to 2008)
		Circuit 87 M1e terminal (M271 engine up to 2008)
		Circuit 87 M1i terminal (M272 engine up to 2008)
24	15	Engine and interior wiring harness connector
		Radiator shutter actuator (OM642 engine)
		CDI control module (OM646 engine)
		Circuit 87 M1i terminal (M272 engine up to 2008)
		Circuit 87 terminal (diesel engines up to 2008)
25	15	ME-SFI control module (M156, M271, M272, M274, M276 engines)
		Upstream oxygen sensor (OM651 engine)
		Exhaust gas treatment control module (OM651 engine)
26	20	Audio module
		Audio module with Auto-Pilot system
		COMAND module
27	7.5	Electronic Ignition Switch (EIS)
		Electronic Steering Lock (ESL) (up to 2008)
		CDI control module (diesel engines)
		ME-SFI control module (gasoline engines)
28	7.5	Instrument cluster
29	10	Right front headlamp
30	10	Left front headlamp
		Engine and interior wiring harness connector (OM642 engine)
31A	15	Left horn
		Right horn
31B	15	Left horn
		Right horn
32	40	Secondary air injection pump (M156, M271, M272 engines)
33	10	Transmission Control Module (TCM) (722.6 transmission)
		Fully Integrated Transmission Control (VGS) (722.9 transmission)
34	7.5	Fuel pump control module (M274, M276 engines), (M271, M272, OM651 from 06/01/2009), (OM642 from 12/01/2009)
35	5	Electronic Stability Program (ESP) (from 2009)
36	7.5	DISTRONIC control module
		Electrohydraulic power steering pump (from 2009)