Mercedes-Benz GLK X204 represents a series of luxury compact crossovers, which were produced in 2008, 2009, 2010, 2011, 2012, 2103, 2014, 2015 in various modifications GLK 200, GLK 2 320, GLK 350 4MATIC. In this article you will find a description of the fuses and relays of the Mercedes x204 with block diagrams and their locations. Let’s highlight the cigarette lighter fuse.

The purpose of fuses and relays may differ from those presented and depends on the year of manufacture and the level of electrical equipment.
Blocks under the hood
Fuse and relay block
The main unit with fuses and relays is located under the hood on the left side and is covered by a protective cover.

To access it, you need to press the latches under the numbers (1) and remove the electrical wires (2). The block itself will look something like this.


Description
| F1 | 25A ESP electronic stability control unit (N30/4) |
| F2 | 30A Front left door control unit (N69/1) |
| F3 | 30A Valid until 31.3.10: |
| Front door control unit right (N69/2) | |
| F4 | 7.5A Valid for vehicles with engines 271, 272 until 31.8.08: |
| Fuel pump control unit (N118) | |
| Valid for vehicles with engine 156: | |
| Left fuel pump control unit (N118/3) | |
| Right fuel pump control unit (N118/4) | |
| Valid for vehicles with engine 642 with code (U41) Fuel filter with moisture separator and service package for the lubrication system, engine 651: | |
| Condensation sensor in fuel filter with heating element (B76/1) | |
| 20A Headlight control unit (N71/1) | |
| 7.5A Valid for vehicles with engine 651, until 31.5.10 or engine 646 with code (71o) Additional installation of a heated fuel filter: | |
| Condensate sensor control unit in fuel filter with heating element (N33/7) | |
| F5 | 7.5A SAM control unit with fuse and relay module in the rear of the cabin (N10/2) |
| Valid for vehicles with 156 engine with code (P98) Black Series, starting from 1.7.11: | |
| Rear axle gearbox coolant circuit relay (K36/3) | |
| Indeed, starting from 1.12.09: | |
| Exterior light switch (S1) | |
| F6 | 10A On vehicles with a diesel engine: |
| CDI control unit (N3/9) | |
| On a vehicle with a gasoline engine: | |
| ME control unit (N3/10) | |
| F7 | 20A Connected via relay terminal 50 of starter (N10/1kM): |
| Starter (M1) | |
| F8 | 7.5A Passenger restraint system control unit (N2/10) |
| F9 | 15A Socket in the glove box (X58/31) |
| F10 | 30A Valid for type 204.9: |
| Wiper motor (M6/1) | |
| F11 | 7.5A Valid for vehicles with code (523) Audio module MB Audio 20 or code (510), Audio 20 incl. CD changer, or code (525) Audio module Mb Audio 50 APS, or code (511) Audio 50 aPs incl. DVD changer, or code (527) COMAND APS with single-disc DVD drive (with navigation function), or code (512) COMAND APS incl. DVD changer or, from 1.6.09 for code (528) COMAND incl. DVD changer: |
| Audio/COMAND display (A40/8) | |
| Audio control panel/COMAND (A40/9) | |
| Valid for vehicles with code (509), navigation module: | |
| Holder for navigation module (A2/30-1) | |
| F12 | 7.5A Climate control system control panel (N22/7) |
| Indeed, for vehicles of type 204.0/2, until 28.2.11, type 204.9: | |
| Upper control panel (N72/1) | |
| F13 | 7.5A Steering column electronic module control unit (N80) |
| Indeed, starting from 1.3.11 on vehicles with code (238) Active Lane Keeping Assist, code (476) Automatic Lane Departure Warning, code (513) Speed Limit Warning or code (608) Adaptive High Beam Control: | |
| Multifunctional camera (A40/11) | |
| F14 | 7.5A ESP electronic stability control unit (N30/4) |
| F15 | 7.5A Passenger restraint system control unit (N2/10) |
| F16 | 5A Valid for vehicles of type 204.0/2, until 31.5.09: |
| Diagnostic connector (X11/4) | |
| 5A Valid for vehicles with KP 722: | |
| Selector lever electronic module control unit (N15/5) | |
| F17 | 30A Valid for vehicles with code (413) Panoramic glass roof with lift-and-slide sunroof: |
| Panoramic roof control module with sliding sunroof (A98) | |
| 30A Valid for vehicles of type 204.0/2/3 with code (414) Electric lift-and-slide glass sunroof: | |
| Ceiling unit control panel control unit (N70) | |
| F18 | 7.5A Valid for vehicles type 204.0/2, starting from 1.3.11, type 204.3: |
| Control unit of the upper control panel (N72/1) | |
| Indeed, for vehicles of type 204.0/2, until 28.2.11, type 204.9: | |
| Terminal connector for the positive wire of the LIN data bus of the air conditioning system of the instrument panel (Z68/2) | |
| Electrical plug connection for the vehicle interior and the wiring harness for the rear position light (X18) | |
| F19 | 20A Electric steering lock control unit (N26/5) |
| Electronic ignition lock control unit (N73) | |
| F20 | 40A ESP electronic stability control unit (N30/4) |
| F21 | 7.5A Valid for vehicles type 204.0/2 until 28.2.11, type 204.9 until 31.5.11: |
| Brake signal sensor (S9/1) | |
| Glove box light switch (S17/9) | |
| Valid for vehicles with code (U18), automatic child seat recognition system (AKSE): | |
| Seat occupancy recognition system and front passenger seat AKSE (B48) | |
| Valid for vehicles with code (498), version for Japan: | |
| Electrical fuse for preparation of Electronic Toll Collection system (F34/5) | |
| F22 | 15A Electric motor for the internal combustion engine fan and air conditioning with integrated regulation (M4/7) |
| Electrical plug connection for interior and engine wiring harness (X26) | |
| F23 | 20A Electrical plug connection for interior and engine wiring harness (X26) |
| On vehicles with a diesel engine: | |
| SAM control unit with fuse and relay module in the rear of the cabin (N10/2) | |
| Electrical plug connection for interior and engine wiring harness (X26) | |
| F24 | 15A Electrical plug connection for interior and engine wiring harness (X26) |
| Valid for vehicles with 642 engine: | |
| Radiator louver actuator (Y84) | |
| Valid for vehicles with 646 engine: | |
| CDI control unit (N3/9) | |
| F25 | 15A Valid for vehicles with engines 156, 271, 272, 274, 276: |
| ME control unit (N3/10) | |
| Valid for vehicles with engine 651: | |
| Lambda probe before the catalytic converter (G3/2) | |
| Indeed, starting from 1.6.10 for type 204.3 with engine 651 and with code (P84) Sport Edition: | |
| Exhaust system sound generator control unit (N12) | |
| F26 | 20A Valid for vehicles with code (523) Audio module MB Audio 20 or code (510) Audio 20, incl. CD changer: |
| Audio module (A2) | |
| Valid for vehicles with code (525) Audio module MB Audio 50 APS or code (511) Audio 50 APS, incl. DVD changer: | |
| Audio module with Auto-Pilot system (A2/56) | |
| Valid for vehicles with code (527) COMAND APS with single-disc DVD drive (with navigation function) or with code (512) COMAND APS incl. DVD changer or from 1.6.09 for code (528) COMAND incl. DVD changer: | |
| COMAND control module (A40/3) | |
| F27 | 7.5A Electronic ignition lock control unit (N73) |
| On vehicles with a diesel engine: | |
| CDI control unit (N3/9) | |
| On a vehicle with a gasoline engine: | |
| ME control unit (N3/10) | |
| F28 | 7.5A Instrument cluster (A1) |
| F29 | 10A Front right block headlight (E2) |
| F30 | 10A Front left block headlight (E1) |
| Valid for vehicles with 642 engine: | |
| Electrical plug connection for interior and engine wiring harness (X26) | |
| F31A | 15A The following are switched on via the sound signal relay (N101 kO): |
| Left horn (H2) | |
| Right horn (H2/1) | |
| F31B | 15A The following are switched on via the sound signal relay (N101 kO): |
| Left horn (H2) | |
| Right horn (H2/1) | |
| F32 | 40A Valid for vehicles with engines 156, 271, 272: |
| Activated via the catalyst purge relay (N10/1 kP): | |
| Electric air pump (M33) | |
| F33 | 10A Valid for vehicles with gearbox 722.6: |
| Automatic transmission electronic control system control unit (N15/3) | |
| Valid for vehicles with KP 722.9: | |
| Fully integrated automatic transmission control unit (Y3/8) | |
| F34 | 7.5A Valid for vehicles with engines 274, 276: |
| Fuel pump control unit (N118) | |
| Valid for vehicles with engines 271, 272, 651, starting from 1.6.09, engine 642, starting from 1.12.09: | |
| Fuel pump control unit (N118) | |
| F35 | 5A ESP electronic stability control unit (N30/4) |
| F36 | 7.5A Valid for vehicles with code (233) Distronic Plus: |
| DISTRONIC electrical control module (A89) | |
| Valid for vehicles of type 204.902/982/984: | |
| Electro-hydraulic power steering (A91/1) | |
| Relay | |
| J | Relay terminals 15 |
| K | Relay terminals 15R |
| L | Relay reserve |
| M | Relay terminals 50, starter |
| N | Relay terminal 87, engine |
| THE | Horn relay |
| P | Valid for vehicles with engines 156, 272, 276: |
| Catalyst purge relay | |
| Q | Valid for code (B03) “ECO Start-Stop function”: |
| Oil cooler fan motor relay | |
| R | Relay terminal 87, chassis |
Fuse number 9 at 15A is responsible for the cigarette lighter in the glove compartment.
Power fuse block
A power fuse box can be installed on the right side of the engine compartment next to the battery.



Marking
| F88 | Pyro fuse: |
| Generator (G2), | |
| Starter (M1) | |
| F89 | 125A SAM front control unit with fuse and relay module (N10/1) |
| F90 | 40A Indeed, except for code (B03) “ECO Start-Stop function”: |
| SAM control unit with fuse and relay module in the rear of the cabin (N10/2) | |
| F91 | 80A Electric motor for internal combustion engine fan and air conditioning with integrated regulation (M4/7) |
| F100 | 40A Fan Controller (A32n1) |
| F101 | 60A Valid for front battery: |
| SAM front control unit with fuse and relay module (N10/1) | |
| Valid for diesel engine with code (833) “UK version”: | |
| Fuse holder, rear left door control unit (F64/1) | |
| Fuse holder, rear right door control unit (F64/2) | |
| F103 | 150A On vehicles with a diesel engine: |
| Additional electric heater (R22/3) | |
| Valid for petrol engine and code (833) “UK version”: | |
| Fuse holder, rear left door control unit (F64/1) | |
| Fuse holder, rear right door control unit (F64/2) | |
| F104 | 70A Passenger compartment fuse box (F34) |
| F105 | 100A SAM front control unit with fuse and relay module (N10/1) |
| F106 | 150A SAM control unit with fuse and relay module in the rear of the cabin (N10/2) |
| F107 | Reserve |
| F108 | Reserve |
| F109 | Reserve |
| F110 | Reserve |
Option 2
Scheme

Appointment
| F150 | 400A For vehicles without code (B03), “ECO Start-Stop” function: |
| Pyro fuse 88 (F32f88) | |
| 200A Valid for vehicles with code (B03), “ECO Start-Stop” function: | |
| Generator (G2) | |
| Starter (M1) | |
| F151 | 100A Electric motor for internal combustion engine fan and air conditioning with built-in regulation (M4/7) |
| F152 | 150A SAM front control unit with fuse and relay module (N10/1) |
| F153 | For vehicles without code (B03), the “ECO Start-Stop” function: |
| Reserve | |
| 60A Valid for vehicles with code (B03) “ECO Start-Stop” function and front battery location: | |
| SAM front control unit with fuse and relay module (N10/1) | |
| F154 | 60A Valid for vehicles without code (B03) “ECO Start-Stop” function and front battery location: |
| SAM front control unit with fuse and relay module (N10/1) | |
| 150A Valid for vehicles with diesel engine and code (B03) “ECO Start-Stopp” function: | |
| Additional electric heater (R22/3) | |
| F155 | Reserve |
| F156 | 150A Valid for vehicles with diesel engine and without code (B03) “ECO Start-Stopp” function: |
| Additional electric heater (R22/3) | |
| 100A Valid for vehicles with code (B03) “ECO Start-Stop” function: | |
| SAM front control unit with fuse and relay module (N10/1) | |
| F157 | 100A Valid for vehicles of type 204.902/982/984 or type 204.987, starting from 1.7.10 to 31.5.11, with code (494) USA version, or code (460) Canada version): |
| Electro-hydraulic power steering (A91/1) | |
| Valid for vehicles of type 204.0/2/3 with engine 274.9, type 204.002, starting from 01.12.12, with engine 651, with gearbox 722.9, type 204.002/202/302, starting from 01. engine, 651 with gearbox 711.6, type 204.9 (except type 204.902/982/984) and type 204.987, starting from 1.7.10, until 31.5.11, with code (494) Version for the USA, or code ) Version for Canada: | |
| Electric power steering control unit (N68) | |
| F158 | 50A Valid on vehicles without code (B03), “ECO Start-Stopp” function: |
| Fan controller (A32n1) | |
| 150A Valid for vehicles with code (B03), “ECO Start-Stop” function: | |
| SAM control unit with fuse and relay module in the rear of the cabin (N10/2) | |
| F159 | 50A Valid for vehicles with code (965) Basic equipment for the electrical equipment of rental vehicles and without code (B03) “ECO Start-Stopp” function: |
| Multifunctional control unit for special vehicle (N26/9) | |
| 200A Valid for vehicles with code (B03), “ECO Start-Stop” function: | |
| Auxiliary battery relay (K57/2) | |
| F160 | 60A Valid for vehicles of type 204.0/2/3, starting from 1.6.12, without code (B03) “ECO Start-Stopp” function: |
| Passenger compartment fuse box (F34) | |
| 50A Valid for vehicles with code (B03), “ECO Start-Stop” function: | |
| Fan controller (A32n1) | |
| F161 | 100A Valid on vehicles without code (B03), “ECO Start-Stopp” function: |
| SAM front control unit with fuse and relay module (N10/1) | |
| 50A Valid for vehicles with code (965) Basic equipment for rental vehicle electrical equipment and code (B03) “ECO Start-Stopp” function: | |
| Multifunctional control unit for special vehicle (N26/9) | |
| F162 | Indeed, a vehicle without a code (B03), “ECO Start-Stopp” function: |
| Reserve | |
| 60A Valid for vehicles of type 204.0/2/3, starting from 1.6.12, with code (B03) “ECO Start-Stopp” function: | |
| Passenger compartment fuse box (F34) | |
| F163 | 150A No code (B03) “ECO Start-Stop function”: |
| SAM control unit with fuse and relay module in the rear of the cabin (N10/2) | |
| F164 | 80A Valid on vehicles without code (B03), “ECO Start-Stopp” function: |
| SAM control unit with fuse and relay module in the rear of the cabin (N10/2) |
Cabin block
There is a fuse box on the left side of the instrument panel.


Transcript
| F116 | 30A Valid until 05/31/09 on vehicles with code (275) Memory function package (Driver’s seat, steering column, mirror): |
| Driver’s seat control unit (N32/1) | |
| F117 | 15A Valid until 31.05.09 on vehicles of type 204.0/2 with code (483) ADVANCED AGILITY package: |
| Adaptive Damping System Control Unit (N51/5) | |
| F118 | Reserve |
| F119 | 7.5A Valid until 05/31/09 for vehicles with code (581) Comfort climate control: |
| Rear passenger compartment fan motor (M2/1) | |
| Valid until 1.6.12 on vehicles with code (255) AMG Performance Media: | |
| AMG Performance Media control unit (N125/3) | |
| F120 | Reserve |
| F121 | Reserve |
| F122 | Reserve |
| F123 | 10A Valid on vehicles of type 204.0/2/3 with code (443) Heated steering wheel or with code (476) Automatic lane recognition: |
| Steering column electronic module control unit (N80) | |
| F124 | Reserve |
| F125 | Reserve |
| F126 | 30A Valid until 31.05.09 on vehicles with code (242) Front passenger seat with electric adjustment and memory: |
| Front passenger seat control unit (N32/2) | |
| F127 | Reserve |
| F128 | Reserve |
| F129 | 20A Valid until 31.05.09 for vehicles with engine 156: |
| Oil cooler fan motor relay (K25) | |
| F130 | Reserve |
| F131 | Reserve |
| F132 | Reserve |
| F133 | Reserve |
| F134 | Reserve |
| F135 | Reserve |
Blocks in the trunk
Fuse and relay block
In the luggage compartment under the luggage compartment floor marked (2) there is a main unit with fuses and relays, covered by a cover (3).



Description
| F37 | 5A Indeed, except for type 204.077/277/377: |
| NECK-PRO driver’s seat headrest solenoid coil (Y24/12) | |
| Front passenger seat headrest NECK-PRO solenoid coil (Y24/13) | |
| F38 | 15A Valid for type 204.2/9: |
| Activated via the tailgate wiper relay (N10/2kE): | |
| Tailgate wiper motor (M6/4) | |
| F39 | 30A Valid for type 204.0/2/9 except for vehicles for the UK until 31.5.09 or for type 204.0/2/9 from 1.6.09: |
| Rear door control unit left (N69/3) | |
| F40 | Reserve |
| F41 | 30A Valid for type 204.0/2/9 until 31.3.10: |
| Right rear door control unit (N69/4) | |
| Effective from 1.4.10: | |
| Front door control unit right (N69/2) | |
| F42 | 25A Valid for gasoline or 642 engine 1.12.09 or 651 engine from 1.6.09: |
| Fuel pump control unit (N118) | |
| 20A Valid for engine 646 or engine 642 from 11/30/09 or engine 651 from 5/31/09: | |
| The following are switched on via the fuel pump relay (N10/2kD): | |
| Fuel pump (M3) | |
| F43 | 5A Valid from 1.6.09 for code (581) “Automatic climate control system of increased comfort”: |
| Rear passenger compartment fan motor (M2/1) | |
| F44 | 30A Valid for type 204.0/3/9 with code (494) “USA version” or with code (460) “Canada version” and without code (275) “Memory function package (driver’s seat, steering column, mirrors)”: |
| Front right seat position adjustment switch block (S23) | |
| Valid without code (494) “USA version” and without code (460) “Canada version” and without code (275) “Memory function package (driver’s seat, steering column, mirrors)”: | |
| Front passenger partially electric seat adjustment switch (S23/1) | |
| F45 | 30A Valid for type 204.0/3/9 with code (494) “USA version” or with code (460) “Canada version” and without code (275) “Memory function package (driver’s seat, steering column, mirrors)”: |
| Front left seat position adjustment switch block (S22) | |
| Valid without code (494) “USA version” and without code (460) “Canada version” and without code (275) “Memory function package (driver’s seat, steering column, mirrors)”: | |
| Driver’s seat partially electrically adjustable switch (S22/1) | |
| F46 | 7.5A Valid for type 204.0/2/9: |
| Antenna amplifier for FM antenna on the rear window (A2/19) | |
| Valid for type 204.3: | |
| FM 2 and DAB antenna amplifier (A2/19) | |
| Valid until 31.5.10 for code (551) “Anti-theft alarm system (EDW)” and from 1.6.10 for code (551) “Anti-theft alarm system (EDW)” and without code (494) “USA version”: | |
| Alarm siren (H3/1) | |
| Valid until 31.5.10 for code (551) “Anti-theft alarm system (EDW)” and from 1.6.10 for code (551) “Anti-theft alarm system (EDW)” and without code (494) “USA version”: | |
| Interior protection and towing protection control unit (N26/6) | |
| Valid for type 204.2: | |
| Antenna amplifier 1 on the rear window (A2/71) | |
| Vehicle type 204.2 with code (498): equipment for Japan: | |
| Antenna amplifier for FM antenna on the rear window (A2/19) | |
| TV 1 antenna amplifier and DAB band III antenna (A94/1) | |
| Vehicle type 204.2 with code (537): digital radio: | |
| DAB band III antenna (A95/2) | |
| Valid for code (498) (Japan version) and code (889) (Keyless Go): | |
| Antenna amplifier TV 2 and KEYLESS-GO (A94/2) (for type 204.0/3/9) | |
| KEYLESS-GO antenna amplifier (A94/4) (for type 204.2) | |
| Valid for vehicles with Keyless Go system (code 889): | |
| Rear window FM antenna amplifier (A2/19) (for type 204.0/2/9) | |
| Antenna amplifier FM 2 and DAB (A2/19) (for type 204.3) | |
| F47 | Reserve |
| F48 | Reserve |
| F49 | 40A The following are switched on via the rear window heating relay (N10/2kC): |
| Rear window heating system (R1) | |
| F50 | 50A Vehicles with code (299): PRE-SAFE system: |
| Reversible front right seat belt tensioner (A76/1) | |
| F51 | 50A Vehicles with code (299): PRE-SAFE system: |
| Reversible front left seat belt tensioner (A76) | |
| F52 | Reserve |
| F53 | 15A Valid until 31.5.09 for code (550) “Traction coupling device”: |
| Trailer recognition system control unit (N28/1) | |
| Valid until 1.6.09 for code (550) “Traction coupling device”: | |
| Trailer recognition system control unit (N28/1) | |
| F54 | 7.5A Valid until 31.5.09 for code (550) “Traction coupling device”: |
| Trailer recognition system control unit (N28/1) | |
| 15A Valid until 1.6.09 for code (550) “Traction coupling device”: | |
| Trailer recognition system control unit (N28/1) | |
| 5A Valid for type 204.077/277/377 until 31.5.09: | |
| Driver’s seat lumbar support and side bolster adjustment switch group (S109/4) | |
| Front passenger seat lumbar support and side bolster adjustment switch group (S109/5) | |
| AMG front passenger seat valve block (Y109/3) | |
| AMG driver’s seat valve block (Y109/2) | |
| F55 | 5A Valid for code (U42) “BlueTEC diesel exhaust gas treatment system”: |
| AdBlue® control unit (N118/5) | |
| F56 | 15A Valid until 31.5.09 for code (550) “Traction coupling device”: |
| Trailer recognition system control unit (N28/1) | |
| Valid until 1.6.09 for code (550) “Traction coupling device”: | |
| Trailer socket (X58) | |
| 5A Valid for type 204.077/277/377 until 31.5.09: | |
| Driver’s seat lumbar support and side bolster adjustment switch group (S109/4) | |
| Front passenger seat lumbar support and side bolster adjustment switch group (S109/5) | |
| AMG front passenger seat valve block (Y109/3) | |
| AMG driver’s seat valve block (Y109/2) | |
| F57 | 20A Valid until 31.5.09 for code (550) “Traction coupling device”: |
| Trailer recognition system control unit (N28/1) | |
| Valid until 1.6.09 for code (550) “Traction coupling device”: | |
| Trailer recognition system control unit (N28/1) | |
| F58 | 20A Valid with towing device with code 550: |
| Trailer recognition system control unit (N28/1) | |
| F59 | 5A Valid for vehicles with code (220): PARKTRONIC system or code (230): exclusive parking assistance system: |
| Parking assist control unit (N62) | |
| Valid for vehicles with code (233) Distronic Plus: | |
| DISTRONIC (DTR) sensor in the front bumper on the left (B29/2) | |
| DISTRONIC (DTR) sensor in the front bumper on the right (B29/3) | |
| Valid for vehicles with blind spot monitoring system (code 234): | |
| Intelligent radar sensor in the rear bumper on the left (B29/4) | |
| Intelligent radar sensor in the rear bumper on the right (B29/5) | |
| F60 | 7.5A Valid for vehicles with code (409) “Multi-contour seat front left/right”: |
| Multi-circuit seat air pump (M40) | |
| F61 | 40A Valid for type 204.2/9 with code (890) “Hinged tailgate with EASY-PACK system”: |
| Tailgate control unit (N121/1) | |
| F62 | 30A Valid from 1.6.09 for code (275) “Memory function package (driver’s seat, steering column, mirrors)”: |
| Driver’s seat control unit (N32/1) | |
| F63 | 30A Valid from 1.6.09 for code (242) “Front passenger seat with electric adjustment of position and function”: |
| Front passenger seat control unit (N32/2) | |
| F64 | 25A Valid for type 204.0/9 with code (U80) “115V socket in luggage compartment”: |
| AC/DC converter control unit (N24/3) | |
| F65 | 15A Valid from 1.6.09 for type 204.0/2/3 with code (483) “ADVANCED AGILITY Package”: |
| Adaptive Damping System Control Unit (N51/5) | |
| Valid for type 204.9 with code (443) “Heated steering wheel” or with code (476) “Automatic lane recognition”: | |
| Steering column electronic module control unit (N80) | |
| F66 | 7.5A Valid for type 204.0/2/3 with engine 651 from 1.6.12 and with code (427) “Automatic transmission 7-speed” or with code (B03) ““ECO Start-Stopp” function”: |
| Transmission oil circulation pump relay (K60/1) | |
| F67 | 30A Valid for cars with a sound system (code 810): |
| Speaker system amplifier control unit (N40/3) | |
| F68 | Reserve |
| F69 | 20A Valid for type 204.9 with code (810) “Speaker system”: |
| Rear subwoofer amplifier (N40/9) | |
| F70 | 5A Valid for vehicles with code (470) “Tire Pressure Monitoring System (Basic), Schrader brand” or with code (475) “Tire Pressure Monitoring System (Premium), Schrader brand”: |
| Tire pressure monitoring system control unit (N88) | |
| F71 | 15A On vehicles with code (301): ashtray set / smoking bag: |
| Cigarette lighter with ashtray illumination at the front (R3) | |
| Really without code (301): ashtray set/smoker’s pack: | |
| Front passenger compartment socket (X58/17) | |
| F72 | 15A Valid for type 204.2/9: |
| Socket in the trunk (X58/4) | |
| Valid for type 204.0/9 with code (U80) “115V socket in luggage compartment”: | |
| 115V Socket (X58/34) | |
| F73 | 7.5A Valid for type 204.0/2, starting from 1.6.09, type 204.9: |
| Diagnostic connector (X11/4) | |
| Valid for engine 156 starting from 1.7.11: | |
| Driving mode control unit (N145) | |
| Valid for vehicles with an autonomous heating system (code 228): | |
| Remote radio control receiver for autonomous heater (A6/1) | |
| F74 | 15A Valid for vehicles with Keyless Go system (code 889): |
| KEYLESS-GO system control unit (N69/5) | |
| F75 | 20A Valid for vehicles with an autonomous heating system (code 228): |
| Parking heater (A6) | |
| F76 | 15A Interior socket (X58/1) |
| F77 | 7.5A Valid for code (U10) Front passenger seat with weight recognition: |
| Passenger Weight Sensing System (WSS) control unit (N110) | |
| F78 | 7.5A Valid from 1.3.11 for cars with code (401) “Front seats of increased comfort, incl. seat heating and ventilation”: |
| Front left seat fan control (N29/5) | |
| Front right seat fan control (N29/6) | |
| F79 | 7.5A Reserve |
| F80 | 5A Valid for vehicles with code (233) “DISTRONIC PLUS”, code (237) “Active Blind Spot Monitoring” or code (238) “Active Lane Keeping Assist”: |
| Video and radar sensor control unit (N62/2) | |
| Valid for type 204.9 starting from 1.6.12 with code (235) “Active parking assistance system”: | |
| Parking assist control unit (N62) | |
| F81 | 5A On vehicles with code (518): multimedia interface: |
| Multimedia interface control unit (N125/1) | |
| F82 | 5A Valid for code (386) “Autonomous heater” or code (228) “Mobile phone”: |
| UMTS mobile communication compensator (A28/13) | |
| Valid until 31.5.09 for code (498) “Performance for Japan”: | |
| TB tuner control unit (N143) | |
| F83 | 7.5A Valid until 28.2.11 for code (498) “Execution for Japan”: |
| Electronic Toll Collection Control Unit (A50/3) | |
| Valid for type 204.0/3/9 with code (359) “TELE AID emergency call system” or with code (348) “Emergency call system/information support system”: | |
| Emergency call system control unit (N123/4) | |
| Valid for type 204.9 with code (866) “Preparation for installation of multimedia entertainment system in the rear of the cabin”: | |
| Display in the rear left part of the cabin (A40/5) | |
| Display in the rear of the cabin on the right (A40/6) | |
| Valid for type 204.9 starting from 1.6.12 with code (218) “Rear view camera” and with code (498) “Version for Japan”: | |
| Rear camera electronics (N93/3) | |
| F84 | 7.5A Valid for type 204.0 with code (536) “SIRIUS satellite radio” and code (523) “MB Audio 20 radio” or code (510) “Audio 20 incl. CD changer”, type 204.0 until 31.5.09 with code (536) “SIRIUS satellite radio” and code (512) “COMAND APS incl. DVD changer”, type 204.9 with code (536) “SIRIUS satellite radio” and code (523) “MB Audio 20 radio” or code (510) “Audio 20 incl. CD changer”, type 204.9 until 31.5.09. with code (536) “SIRIUS Satellite Radio” and with code (512) “COMAND APS incl. DVD changer”, type 204.0/9 from 1.6.10 with code (536) “SIRIUS Satellite Radio”, type 204.3 with code (536) “SIRIUS Satellite Radio”: |
| Satellite Digital Audio Radio (SDAR) control unit (N87/5) | |
| Valid from 1.6.09 to 31.5.10 for type 204.0/9 with code (536 “SIRIUS Satellite Radio”: | |
| SDAR control unit/high-resolution tuner (N87/8) | |
| Valid for vehicles with digital radio (code 537): | |
| Digital audio broadcasting control unit (N87/3) | |
| Valid for type 204.0/2/3 with code (218) “Rear view camera” and without code (498) “Version for Japan”, type 204.9 until 31.5.12 with code (218) “Rear view camera” and without code (498) “Version for Japan”: | |
| Rear view camera power supply module (N66/10) | |
| Valid for type 204.0/2/3 with code (218) “Rear view camera” and code (498) “Version for Japan”, type 204.9 until 31.5.12 with code (218) “Rear view camera” and code (498) “Version for Japan”: | |
| Rear view camera control unit (N66/2) | |
| Type 204.9 from 1.6.12 with code (218) “Rear view camera” and with code (498) “Version for Japan”: | |
| Rear camera electronics (N93/3) | |
| Type 204.9 from 1.6.12 with code (218) “Rear view camera” and without code (498) “Version for Japan”: | |
| Rear view camera (B84/3) | |
| Valid for code (501) 360-degree camera: | |
| 360° camera control unit (N148) | |
| F85 | 7.5A Valid until 31.5.09 for code (498) “Execution for Japan”: |
| TB tuner control unit (N143) | |
| Effective from 1.6.09 for code (498) “Performance for Japan”: | |
| Digital TB tuner (A90/3) | |
| F86 | 7.5A Valid for type 204.9 with code (864) “Multimedia entertainment system in the rear of the cabin”: |
| DVD player (A40/4) | |
| F87 | 7.5A Valid for type 204.0/3/9 with code (359) “TELE AID emergency call system” or with code (348) “Emergency call system/information support system”: |
| Emergency call system control unit (N123/4) | |
| F88 | 15A Valid for vehicles with 722 gearbox: |
| DIRECT SELECT automatic transmission servo module (A80) | |
| F89 | 20A Valid until 1.6.09 for code (550) “Traction coupling device”: |
| Trailer recognition system control unit (N28/1) | |
| Valid from 1.6.09 for engine 156: | |
| Oil cooler fan motor relay (K25) | |
| True for the code (P98) Black Series: | |
| Rear axle gearbox coolant circuit relay (K36/3) | |
| F90 | 40A Valid for code (U42) “BlueTEC diesel engine exhaust gas purification system”: |
| AdBlue® fuse box (F37) | |
| AdBlue® supply relay (K27/7) | |
| F91 | Reserve |
| F92 | Reserve |
| Relay | |
| A | Relay terminals 15 |
| B | Relay terminals 15R (1) |
| C | Rear window heating relay |
| D | On vehicles with a diesel engine: |
| Fuel pump relay | |
| AND | Valid for type 204.2/9: |
| Tailgate wiper relay | |
| F | Really without code (275) “Memory function package” (driver’s seat, steering column, mirrors): |
| Seat position adjustment relay | |
| G | Relay terminals 15R (2) |
Fuses 71, 72, and 76 at 15A are responsible for the operation of the cigarette lighters.
Power fuse block
Not far from the main unit, a power fuse block is mounted.
Scheme

Marking
- F111 – 60A Valid for vehicles with engine 156, 642, 646 and battery in the rear of the vehicle: Front SAM control unit with fuse and relay module (N10/1)
- F112 – 80A Valid until 31.5.09 vehicles with code (965) Electrical preparation of rental vehicle: Multifunctional control unit for special vehicle (N26/9)
- F113 – 40A Valid for engines 156: Left fuel pump control unit (N118/3), Right fuel pump control unit (N118/4)
- F114 – Reserve
- F115 – 100A Valid until 31.5.09 vehicles with code (965) Electrical preparation of rental vehicle: Multifunctional control unit for special vehicle (N26/9)