The fourth-generation (Mk4) Audi A4 and S4 (chassis codes B8/8K) , Audi’s luxury sedan and its high-performance counterpart, was produced from 2008 to 2015 . Praised for its refined design, advanced features, and impressive performance, this generation solidified its position as a benchmark in the premium sedan segment.
In this article, you will find detailed fuse box diagrams for Audi A4 and S4 models produced in 2008, 2009, 2010, 2011, 2012, 2013, 2014 and 2015 . These diagrams provide essential insights into the vehicle’s electrical systems, helping owners and technicians understand the assignment of each fuse (fuse layout). This information is crucial for diagnosing electrical issues, performing routine maintenance, or carrying out necessary repairs.
This guide serves as a practical resource for understanding the electrical system of the fourth-generation Audi A4 and S4, ensuring that owners have the knowledge and tools to maintain the reliability, functionality, and performance of these premium vehicles.
The cigar lighter / power outlet fuses in the Audi A4/S4 are as follows:
In the Red Fuse Panel D (located in the Luggage Compartment ) for 2008–2012 models :
Fuse №1 : Rear Center Console Outlet.Fuse №2 : Front Center Console Outlet.Fuse №3 : Luggage Compartment Outlet.Fuse №4 : Cigarette Lighter.
In the Brown Fuse Panel C (located in the Luggage Compartment ) for 2013–2015 models :
Fuse №2 : Covers all applicable outlets.
There are two blocks – on the right and on the left side of the instrument panel.
It is located on the right side of the trunk, behind the trim panel.
Assignment of the fuses in the Instrument panel, driver’s side (2008-2009)
Number Electric equipment Ampere rattings [A] Black carrier 1 Dynamic steering 5 2 Clutch sensor 5 3 Garage door opener 5 4 Audi lane assist 10 5 Air conditioner 5 6 Headlight range control (right) 5 7 Headlight range control (left) 5 8 Control unit 1 for vehicle’s electrical system 5 9 Interior mirrors 5 10 Selector gate 5 11 Heated washer jets 5 12 Air conditioner 5 Brown carrier 1 — — 2 Clutch sensor 5 3 Fuel pump (diesel/petrol) 20 / 25 4 Auxiliary water pump (3.2 FSI) 5 5 Seat heating (left-side) with/without seat ventilation 30 6 Electronic stabilisation program 10 7 Horn 25 8 Electric window motor (left door) 30 9 Wiper motor 30 10 Electronic stabilisation program 25 11 Door control unit (driver’s side) 15 12 Rain and light sensor 5 Red carrier 1 — — 2 — — 3 Lumbar support 10 4 Dynamic steering 35 5 Interior light 5 6 Control unit 1 for vehicle’s electrical system 35 7 Control unit 1 for vehicle’s electrical system 30 8 Control unit 1 for vehicle’s electrical system 30 9 Tilting panorama roof/sun roof 20 10 Control unit 1 for vehicle’s electrical system 30 11 — — 12 Convenience electronics 5
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Assignment of the fuses in the Instrument panel, passenger’s side (2008-2009)
Number Electric equipment Ampere rattings (A] Black carrier 1 — — 2 — — 3 — — 4 — — 5 Steering column switch module 5 6 Electronic Stabilisation Program 5 7 Diagnostic connector 5 8 Gateway (diagnostic interface for data bus) 5 9 — — 10 — — 11 — — 12 — — Brown carrier 1 CD drive 5 2 Switch module for Audi drive select 5 3 MMI/Radio 10 / 20 4 Light switch 5 5 Control unit for instrument cluster 5 6 Ignition lock 5 7 — — 8 Air conditioner blower 40 9 Steering column lock 5 10 Air conditioner 10 11 Diagnostic connector 10 12 Steering column switch module 5
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Assignment of the fuses in the Luggage compartment (2008)
Number Electric equipment Ampere rattings [A] Black carrier 1 — — 2 Control unit for trailer 15 3 Control unit for trailer 20 4 Control unit for trailer 20 5 Electronic parking brake 5 6 Electronic suspension control 15 7 Electro-mechanical parking brake 30 8 Control unit 2 for vehicle’s electrical system 30 9 — — 10 Control unit 2 for vehicle’s electrical system 30 11 Control unit 2 for vehicle’s electrical system 20 12 — — Brown carrier 1 Electrical socket 15 2 — — 3 Radio/navigation 7.5 4 Control unit for digital sound system 30 5 MMI 5 6 Door control unit (driver’s side) 30 7 Electro-mechanical parking brake 30 8 Seat heating, rear 30 9 Door control unit (passenger side) 30 10 Remote control receiver for auxiliary heating 5 11 Door control unit (passenger side) 15 12 Control unit for reversing camera 5 Red carrier 1 Socket, centre console, rear 15 2 Socket, centre console, front 15 3 Socket, luggage compartment 15 4 Cigarette lighter 15 5 Parking aid 5 6 Phone pre-installation without handsfree system (VDA interface) 5 7 Control unit for adaptive cruise control 15 8 — — 9 EPB switch (electro-mechanical parking brake) 5 10 Lane change assist feature 5 11 Seat heating, rear 5 12 Airbag 5
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Assignment of the fuses in the Instrument panel, driver’s side (2010)
Number Electric equipment Ampere rattings [A] Black panel A 1 Dynamic steering 5 2 — — 3 Homelink 5 4 — — 5 Climate control 5 6 Right headlight range adjustment 5 7 Left headlight range adjustment 5 8 Vehicle electrical system control module 1 5 9 Adaptive Cruise Control 5 10 Shift gate 5 11 Heater washer fluid nozzles 5 12 Climate control 5 13 Cell phone prep 5 14 Airbag 5 15 Terminal 15 25 16 Terminal 15 engine 40 Brown panel B 1 Automatic dimming interior rearview mirror 5 2 Clutch sensor 5 3 Gasoline fuel pump 25 4 Auxiliary water pump 3.2L FSI 5 5 Left seat heating with/without seat heating 15 / 30 6 Electronic Stabilization Program 10 7 Horn 25 8 Left door window regulator motor 30 9 Wiper motor 30 10 Electronic Stabilization Program 25 11 Left doors 15 12 Rain and light sensor 5 Red panel 1 — — 2 — — 3 Lumbar support 10 4 Dynamic steering 35 5 Climatized cupholder 5 6 Vehicle electrical system control module 1 35 7 Vehicle electrical system control module 1 20 8 Vehicle electrical system control module 1 30 9 Panorama sunroof 20 10 Vehicle electrical system control module 1 30 11 Panorama sunroof shade 20 12 Convenience electronics 5
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Assignment of the fuses in the Instrument panel, passenger’s side (2010)
Number Electric equipment Ampere rattings [A] Black carrier 1 — — 2 — — 3 — — 4 — — 5 Steering column switch module 5 6 Electronic Stabilisation Program 5 7 Terminal 15 diagnostic connector 5 8 Gateway 5 9 — — 10 — — 11 — — 12 — — Brown panel 1 CD drive 5 2 Audi drive select switch module 5 3 MMI/Radio 5 / 20 4 Instrument cluster 5 5 Gateway 5 6 Ignition lock 5 7 Rotary light switch 5 8 Climate control system blower 40 9 Steering column lock 5 10 Climate control 10 11 Terminal 30 diagnostic connector 10 12 Steering column switch module 5
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Assignment of the fuses in the Luggage compartment (2010)
Number Electric equipment Ampere rattings [A] Black panel B 1 Luggage compartment lid control module (Avant) 30 2 Trailer control mod ule 15 3 Trailer control mod ule 20 4 Trailer control mod ule 20 5 Electromechanical parking brake 5 6 Electronic damping control 15 7 Electromechanical parking brake 30 8 Vehicle electrical system control module 2 30 9 Quattro Sport 35 10 Vehicle electrical system control module 2 30 11 Vehicle electrical system control module 2 20 12 Terminal 30 5 Brown panel C 1 Luggage compartment lid control module 30 2 Right front seat heating 15 3 DC DC converter path 1 40 4 DC DC converter path 2 40 5 Socket 30 6 — — 7 Electromechanical parking brake 30 8 Rear seat heating 30 9 Passenger side door con rol module 30 10 — — 11 Passenger side door control module 15 12 — — Red panel D 1 Rear center console outlet 15 2 Front center console outlet 15 3 Luggage compartment outlet 15 4 Cigarette lighter 15 5 V6FSI 5 6 Rear Seat Entertainment supply 5 7 Parking system 7,5 8 Rear wiper (Avant) 15 9 Electromechanical park ing brake switch 5 10 Audi side assist 5 11 Rear seat heating 5 12 Terminal 15 control modules 5 Black panel E 1 — — 2 — — 3 DSP amplifier, radio 30 / 20 4 MMI 7,5 5 Radio/navigation/cell phone prep 7,5 6 Rearview camera 5 7 — — 8 — — 9 — — 10 — — 11 — — 12 — —
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Assignment of the fuses in the Instrument panel, driver’s side (2011, 2012)
Number Electric equipment Ampere rattings [A] Black panel A 1 Dynamic steering 5 2 — — 3 Homelink 5 4 — — 5 Climate control 5 6 Right headlight range adjustment 5 7 Left headlight range adjustment 5 8 Vehicle electrical system control module 1 5 9 Adaptive Cruise Control 5 10 Shift gate 5 11 Heater washer fluid nozzles 5 12 Climate control 5 13 Cell phone prep 5 14 Airbag 5 15 Terminal 15 25 16 Terminal 15 engine 40 Brown panel B 1 Automatic dimming interior rearview mirror 5 2 Clutch sensor 5 3 Gasoline fuel pump 25 4 — — 5 Left seat heating with/without seat heating 15 / 30 6 Electronic Stabilization Program 10 7 Horn 25 8 Left door window regulator motor 30 9 Wiper motor 30 10 Electronic Stabilization Program 25 11 Left doors 15 12 Rain and light sensor 5 Red panel C 1 — — 2 — — 3 Lumbar support 10 4 Dynamic steering 35 5 Antenna (Avant) 5 6 Vehicle electrical system control module 1 35 7 Vehicle electrical system control module 1 20 8 Vehicle electrical system control module 1 30 9 Sunroof 20 10 Vehicle electrical system control module 1 30 11 Sunroof shade (Avant) 20 12 Convenience electronics 5
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Assignment of the fuses in the Instrument panel, passenger’s side (2011, 2012)
Number Electric equipment Ampere rattings [A] Black carrier A 1 — — 2 — — 3 — — 4 — — 5 Steering column switch module 5 6 Electronic Stabilisation Program 5 7 Terminal 15 diagnostic connector 5 8 Gateway (Databus diagnostic interface) 5 9 — — 10 — — 11 — — 12 — — Brown panel B 1 CD-/DVD player 5 2 Audi drive select switch module 5 3 MMI/Radio 5 / 20 4 Instrument cluster 5 5 Gateway (instrument cluster control module) 5 6 Ignition lock 5 7 Rotary light switch 5 8 Climate control system blower 40 9 Steering column lock 5 10 Climate control 10 11 Terminal 30 diagnostic connector 10 12 Steering column switch module 5
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Assignment of the fuses in the Luggage compartment (2011, 2012)
Number Electric equipment Ampere rattings [A] Black panel B 1 Luggage compartment lid control module (Avant) 30 2 Trailer control module 15 3 Trailer control module 20 4 Trailer control module 20 5 Electromechanical parking brake 5 6 Electronic damping control 15 7 Electromechanical parking brake 30 8 Vehicle electrical system control module 2 30 9 Quattro Sport 35 10 Vehicle electrical system control module 2 30 11 Vehicle electrical system control module 20 12 Terminal 30 5 Brown panel C 1 Luggage compartment lid control module 30 2 Right front seat heating 15 3 DC DC converter path 1 40 4 DC DC converter path 2 40 5 Socket 30 6 — — 7 Electromechanical parking brake 30 8 Rear seat heating 30 9 Passenger side door con rol module 30 10 — — 11 Passenger side door control module 15 12 — — Red panel D 1 Rear center console outlet 15 2 Front center console outlet 15 3 Luggage compartment outlet 15 4 Cigarette lighter 15 5 V6FSI 5 6 Rear Seat Entertainment supply 5 7 Parking system 7,5 8 Rear wiper (Avant) 15 9 Electromechanical parking brake switch 5 10 Audi side assist 5 11 Rear seat heating 5 12 Terminal 15 control modules 5 Black panel E 1 — — 2 — — 3 DSP amplifier, radio 30 / 20 4 MMI 7,5 5 Radio/navigation/cell phone prep 7,5 6 — — 7 Cell phone prep 5 8 — — 9 — — 10 — — 11 — — 12 — —
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Assignment of the fuses in the Instrument panel, driver’s side (2013)
Number Electric equipment Ampere rattings [A] Black panel A 1 Dynamic steering 5 2 ESC control module 5 3 A/C system pressure sensor, electromechanical parking brake, Homelink. automatic dimming interior rear view mirror, air quality/outside air sensor, ESC button 5 4 — — 5 Sound actuator/exhaust sound tuning 5/15 6 Headlight range control systern/cornering light 5/7,5 7 Headlight (cornering light) 7,5 8 Control modules (electromechanical parking brake, shock absorber, quattro sport, trailer hitch), DCDC converter 5 9 Adaptive cruise control 5 10 Shift gate 5 11 Side assist 5 12 Headlight range control, parking system 5 13 Airbag 5 14 Rear wiper (allroad) 15 15 Auxiliary fuse (instrument panel) 10 16 Auxiliary fuse terminal 15 (engine area) 40 Brown panel B 1 — — 2 Brake light sensor 5 3 Fuel pump 25 4 Clutch sensor 5 5 Left seat heating with/without seat ventilation 15/30 6 ESC 5 7 Horn 15 8 Front left door (window regulator, central locking, mirror, switch, lighting) 30 9 Wiper motor 30 10 ESC 25 11 Two-door models: rear left window’ regulator, Four-door models: rear left door (window regulator, central locking, switch, lighting) 30 12 Rain and light sensor 5 Red panel C 1 — — 2 — — 3 Lumbar support 10 4 Dynamic steering 35 5 Interior lighting (Cabriolet) 5 6 Windshield washer system, headlight washer system 35 7 Vehicle electrical system control module 1 20 8 Vehicle electrical system control module 1 30 9 Left rear window regulator motor (Cabriolet)/sunroof 7,5/20 10 Vehicle electrical system control module 1 30 11 Right rear window regulator (Cabrioletysun shade motor 7,5/20 12 Anti-theft alarm warning system 5
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Assignment of the fuses in the Instrument panel, passenger’s side (2013)
Number Electric equipment Ampere rattiigs [A] Black carrier A 1 — — 2 — — 3 — — 4 — — 5 Steering column switch module 5 6 — — 7 Terminal 15 diagnostic connector 5 8 Gateway {Databus diagnostic interface) 5 9 Supplementary heater 5 10 — — 11 — — 12 — — Brown panel B 1 CD-/DVD player 5 2 Wi-Fi 5 3 MMI/Radio 5/20 4 Instrument cluster 5 5 Gateway (instrument cluster control module) 5 6 Ignition lock 5 7 Light switch 5 8 Climate control system blower 40 9 Steering column lock 5 10 Climate control system 10 11 Terminal 30 diagnostic connector 10 12 Steering column switch module 5
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Assignment of the fuses in the Luggage compartment (2013)
Number Electric equipment Ampere rattings [A] Black panel B 1 Luggage compartment lid control module (all road) / Power top control module (Cabriolet) 30/10 2 Trailer cont rol module or retractable rear spoiler (RS 5 Coupe) 15 3 Trailer control module 20 4 Trailer control module 20 5 Electromechanical parking brake 5 6 Electronic damping control 15 7 Electromechanical parking brake 30 8 Rear exterior lighting 30 9 Quattro Sport 35 10 Rear exterior lighting 30 11 Vehicle electrical system control module 20 12 Terminal 30 5 Brown panel C 1 Luggage compartment lid control module (allroad) 30 2 12-volt socket, cigarette lighter 20 3 DC DC converter path 1 40 4 DCDC converter path 2, DSP amplifier, radio 40 5 Right upper cabin heating (Cabriolet) 30 6 — — 7 Electromechanical parking brake 30 8 — — 9 Rig ht front door (window regulator, central locking, mirror, switch, lighting) 30 10 Left upper cabin heating (Cabriolet) 30 11 Two-door models : rear right window regu lator, Four-door models: rear right door (window regulator, central locking, switch , lighti ng) 30 12 Cell phone prep 5 Black panel E 1 Right front seat heating 15 2 — — 3 — — 4 MMI 7,5 5 Radio 5 6 Rear view camera 5 7 Rear window heater (allroad) 30 8 Rear Seat Entertainment 5 9 — — 10 — — 11 — — 12 — —
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Assignment of the fuses in the Instrument panel, driver’s side (2014, 2015)
Number Electric equipment Ampere rattings [A] Black panel A 1 Dynamic steering 5 2 Electronic Stabilization Control (module) 5 3 A/C system pressure sensor, electromechanical parking brake, Homelink. automatic dimming interior rear view mirror, air quality/outside air sensor, Electronic Stabilization Control (button) 5 4 — — 5 Sound actuator 5 6 Headlight range control/head light (cornering light) 5/7,5 7 Headlight (cornering light) 7,5 8 Control modules (electromechanical parking brake, shock absorber, quattro sport), DCDC converter 5 9 Adaptive cruise control 5 10 Shift gate/clutch sensor 5 11 Side assist 5 12 Headlight range control, parking system 5 13 Airbag 5 14 Rear wiper (allroad) 15 15 Auxiliary fuse (instrument panel) 10 16 Auxiliary fuse terminal 15 (engine area) 40 Brown panel B 1 — — 2 Brake light sensor 5 3 Fuel pump 25 4 Clutch sensor 5 5 Left seat heating with/without seat ventilation 15/30 6 Electronic Stabilization Control (electric) 5 7 Horn 15 8 Front left door (window regulator, central locking, mirror, switch, lighting) 30 9 Windshield wiper motor 30 10 Electronic Stabilization Control (valves) 25 11 Two-door models: rear left window’ regulator, Four-door models: rear left door (window regulator, central locking, switch, lighting) 30 12 Rain and light sensor 5 Red panel C 1 — — 2 — — 3 Lumbar support 10 4 Dynamic steering 35 5 Interior lighting (Cabriolet) 5 6 Windshield washer system, headlight washer system 35 7 Vehicle electrical system control module 1 20 8 Vehicle electrical system control module 1 30 9 Left rear window regulator motor (Cabriolet)/sunroof 7,5/20 10 Vehicle electrical system control module 1 30 11 Right rear window regulator (Cabriolet) sun shade motor 7,5/20 12 Anti-theft alarm warning system 5
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Assignment of the fuses in the Instrument panel, passenger’s side (2014, 2015)
Number Electric equipment Ampere rattings [A] Black panel A 1 — — 2 — — 3 — — 4 — — 5 Steering column switch module 5 6 — — 7 Terminal 15 diagnostic connector 5 8 Gateway (Databus diagnostic interface) 5 9 Supplementary heater 5 10 — — 11 — — 12 — — Brown panel B 1 CD-/DVD player 5 2 Wi-Fi 5 3 MMI/Radio 5/20 4 Instrument cluster 5 5 Gateway (instrument cluster control module) 5 6 Ignition lock 5 7 Light switch 5 8 Climate control system blower 40 9 Steering column lock 5 10 Climate control system 10 11 Terminal 30 diagnostic connector 10 12 Steering column switch module 5
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Assignment of the fuses in the Luggage compartment (2014, 2015)
Number Electric equipment Ampere rattings [A] Black panel A 1 — 30 2 Rear window beater (Cabriolet) 30 3 Power top latch (Cabriolet) 30 4 Power top hydraulics (Cabriolet) 50 Black panel B 1 Luggage compartment lid control module (all road) / Power top control module (Cabriolet) 30/10 2 Retractable rear spoiler (RS 5 Coupe) 10 3 — — 4 — — 5 Electromechanical parking brake 5 6 Electronic damping control 15 7 Electromechanical parking brake 30 8 Rear exterior lighting 30 9 Quattro Sport 35 10 Rear exterior lighting 30 11 Central locking 20 12 Terminal 30 5 Brown panel C 1 Luggage compartment lid control module (allroad) 30 2 12-volt socket, cigarette lighter 20 3 DCDC converter path 1 40 4 DCDC converter path 2. DSP amplifier, radio 40 5 Right upper cabin heating (Cabriolet) 30 6 — — 7 Electromechanical parking brake 30 8 — — 9 Right front door (window regulator, central locking, mirror, switch, lighting) 30 10 Left upper cabin heating (Cabriolet) 30 11 Two-door models : rear right window regu lator, Four-door models : rear right door (window regulator, central locking, switch , lighting) 30 12 Cell phone prep 5 Black panel E 1 Right front seat heating 15 2 — — 3 — — 4 MMl 7.5 5 Radio 5 6 Rear view camera 5 7 Rear window heater (allroad) 30 8 Rear Seat Entertainment 5 9 — — 10 — — 11 — — 12 — —
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