Volkswagen Passat B8 Fuses: Complete Guide 2014+

ByAlex Smidt

The Volkswagen Passat B8, produced from 2014 onwards, features a sophisticated electrical architecture with multiple fuse boxes protecting every circuit in the vehicle. Understanding the fuse layout is essential for diagnosing electrical faults, replacing blown fuses safely, and avoiding costly dealership visits for simple fixes. This guide provides a complete and exhaustive fuse box diagram for the Passat B8, covering all fuse locations, amperage ratings, and protected components.

Fuse Box Locations on the Volkswagen Passat B8

The Passat B8 has three main fuse panel locations:

  • Fuse panel A – Located in the dashboard on the driver’s side (left-hand drive), behind a cover on the left end of the instrument panel
  • Fuse panel B – Located in the engine compartment, on the left side near the battery
  • Fuse panel C – Located under the rear seat or in the boot area (on some variants), associated with the battery management system

Dashboard Fuse Box (Fuse Panel A) – Complete Fuse List

  • SA1 – 5A – Instrument cluster, control units
  • SA2 – 5A – Rain and light sensor, interior mirror
  • SA3 – 5A – Diagnostic interface (OBD port)
  • SA4 – 5A – Airbag control unit
  • SA5 – 5A – Steering column electronics, lane assist
  • SA6 – 5A – Parking brake control unit
  • SA7 – 5A – Driver assistance systems (adaptive cruise control)
  • SA8 – 5A – Rear view camera
  • SA9 – 10A – ABS/ESC control unit
  • SA10 – 10A – Gearbox control unit (DSG/automatic)
  • SA11 – 10A – Engine control unit (ECU)
  • SA12 – 10A – Steering control module (electromechanical power steering)
  • SA13 – 10A – Air conditioning control unit, blower
  • SA14 – 10A – Infotainment system, radio, navigation
  • SA15 – 10A – Telephone module, antenna amplifier
  • SA16 – 10A – Gateway control unit (data bus)
  • SA17 – 15A – Windscreen wiper motor
  • SA18 – 15A – Heated rear window
  • SA19 – 15A – Cigarette lighter / 12V socket (front)
  • SA20 – 15A – Central locking, door control units
  • SA21 – 15A – Interior lighting, reading lights
  • SA22 – 15A – Seat heating (front left)
  • SA23 – 15A – Seat heating (front right)
  • SA24 – 20A – Horn
  • SA25 – 20A – Fuel pump relay circuit
  • SA26 – 20A – Sunroof / panoramic roof motor
  • SA27 – 20A – Electrically adjustable seats
  • SA28 – 25A – Blower motor (HVAC)
  • SA29 – 25A – Rear 12V socket / USB ports
  • SA30 – 30A – Front heated seats (combined)
  • SA31 – 30A – Power windows (front)
  • SA32 – 30A – Power windows (rear)
  • SA33 – 40A – Heated windscreen (if equipped)

Engine Compartment Fuse Box (Fuse Panel B) – Complete Fuse List

  • SB1 – 5A – Lambda sensor / O2 sensor heater
  • SB2 – 10A – Coolant fan control module
  • SB3 – 10A – Injectors (petrol engines)
  • SB4 – 10A – Glow plugs relay (diesel engines)
  • SB5 – 10A – Throttle body actuator
  • SB6 – 15A – Headlight washer system pump
  • SB7 – 15A – Windscreen washer pump
  • SB8 – 20A – Radiator fan (low speed)
  • SB9 – 30A – Radiator fan (high speed)
  • SB10 – 30A – Starter motor relay
  • SB11 – 40A – ABS/ESC pump motor
  • SB12 – 40A – Power steering pump (if hydraulic assisted)
  • SB13 – 50A – Main supply to dashboard fuse box
  • SB14 – 60A – Alternator / battery charging circuit
  • SB15 – 60A – Fuse panel A main feed
  • SB16 – 80A – Blower motor main relay
  • SB17 – 5A – NOx sensor (diesel TDI)
  • SB18 – 10A – Turbocharger actuator / boost pressure control
  • SB19 – 10A – AdBlue dosing unit (TDI models)
  • SB20 – 15A – EGR valve actuator
  • SB21 – 20A – Fuel pump (direct supply)
  • SB22 – 30A – Air conditioning compressor clutch

Relay Positions in Engine Bay Fuse Box

  • Relay J17 – Fuel pump relay
  • Relay J682 – Terminal 15 voltage supply relay
  • Relay J695 – Terminal 30 supply relay (wake-up circuit)
  • Relay J540 – Load reduction relay (battery saver)

How to Check and Replace a Fuse on the Passat B8

  • Always switch off the ignition and remove the key before inspecting fuses
  • Use the plastic fuse puller tool located inside the dashboard fuse box cover
  • Check the fuse visually and with a test light or multimeter for continuity
  • Always replace with a fuse of identical amperage – never fit a higher-rated fuse
  • If a fuse blows repeatedly, the underlying circuit must be diagnosed before replacement
  • Mini, standard (ATO), and maxi blade fuses are all used across the B8 platforms

Common Electrical Issues and Blown Fuse Symptoms – Passat B8

  • No interior lighting – Check SA21 (15A)
  • 12V socket not working – Check SA19 or SA29
  • Wipers not working – Check SA17 (15A) and wiper relay
  • Radio / infotainment dead – Check SA14 (10A)
  • Power windows inoperative – Check SA31 or SA32 (30A)
  • Heated rear screen not activating – Check SA18 (15A)
  • Fuel pump not priming – Check SB21 (20A) and relay J17
  • ABS warning light – Check SB11 (40A) and SA9 (10A)

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