McLaren 720S 2020 Fuse Box Info
Passenger compartment fuse box location:
The fuse box 1 (Main fuse box) is located behind a panel in the rear bulkhead, behind the left-hand seat.
The fuse box 2 (Secondary fuse box) is located below the dashboard on the passenger’s side.
Luggage compartment fuse box location:
The fuse box is located at the battery.
Fuse Box Diagram | Layout
Passenger compartment fuse box 1:
| Fuse/Relay N° | Rating | Functions |
| F1 | 60A | Right-Hand Secondary Air Pump |
| F2 | 60A | Left-Hand Secondary Air Pump |
| F3 | 20A | Tonneau Motor Right-Hand (Spider Only) |
| F4 | 20A | Tonneau Motor Left-Hand (Spider Only) |
| F5 | 30A | Transmission Control Unit |
| F6 | 30A | Transmission Control Unit |
| F7 | 30A | Starter |
| F8 | 30A | Heated Rear Window |
| F9 | 30A | Audio Amplifier (16 Channel) |
| F10 | 20A | Roof Central ECU (Spider Only) |
| F11 | 20A | Roof Central ECU (Spider Only) |
| F12 | 20A | Roof Main Motor Left-Hand (Spider Only) |
| F13 | 5A | Transmission Control Unit |
| F14 | 5A | Engine Control Module |
| F15 | 10A | Relays |
| F16 | - | - |
| F17 | 3A | Door Locking Switch |
| F18 | 50A | ECU Main Relay Feed |
| F19 | 40A | Fuel Pump |
| F20 | 30A | Seat Driver’s |
| F21 | 30A | Seat Passenger’s |
| F22 | 20A | Roof Main Motor Right-Hand (Spider Only) |
| F23 | 5A | Tilt and Microwave Sensor |
| F24 | 20A | Infotainment Control Unit |
| F25 | 10A | Driver’s/Passenger’s Door Latch |
| F26 | 3A | Auxiliary USB Board |
| F27 | - | - |
| F28 | - | - |
| F29 | - | - |
| F30 | - | - |
| F31 | 50A | Cooling Fan Left-Hand |
| F32 | 50A | Cooling Fan Right-Hand |
| F33 | - | - |
| F34 | - | - |
| F35 | - | - |
| F36 | 20A | ECM Power Supply |
| F37 | 15A | Canister Purge, Lambda Sensors, Cooling Fan Relay Coil |
| F38 | 15A | Fuel Injection and Ignition - Left-Hand Bank |
| F39 | 15A | Fuel Injection and Ignition - Right-Hand Bank |
| F40 | 10A | Engine Ancillaries |
| R41 | - | - |
| R42 | - | - |
| R43 | - | - |
| R44 | - | - |
| F45 | 10A | Electrical Thermostats, Camshaft Actuators |
| F46 | 3A | Output Shaft Speed, Even Gear Shaft Speed |
| F47 | 3A | Input Shaft Speed, Odd Gear Shaft Speed |
| F48 | - | - |
| F49 | 5A | Starter |
| R50 | - | - |
| R51 | - | Heated Rear Window |
| R52 | - | - |
| R53 | - | Transmission Control Unit |
| R54 | - | Transmission Control Unit |
| R55 | - | Starter |
| R56 | - | Secondary Air Pump RH |
| R57 | - | Cooling Fans |
| R58 | - | ECU Main relay Feed |
Passenger compartment fuse box 2:
| Fuse/Relay N° | Rating | Functions |
| F1 | 20A | Driver’s door |
| F2 | 20A | Passenger’s door |
| F3 | 25A | Lights |
| F4 | 35A | Lights |
| F5 | 35A | Body |
| F6 | 35A | Body |
| F7 | 35A | Alarm |
| F8 | - | - |
| F9 | - | - |
| F10 | - | - |
| F11 | - | - |
| F12 | - | - |
| F13 | - | - |
| F14 | 5A | Transmission Control Unit |
| F15 | 10A | Air Conditioning |
| F16 | 3A | Alarm Control Unit |
| F17 | 3A | Tracker |
| F18 | 7.5A | Alarm |
| F19 | 5A | Central Display |
| F20 | 3A | Transmission Control Unit Relays |
| F21 | 15A | Display Control Unit |
| F22 | - | - |
| F23 | 5A | Driver Display |
| F24 | 10A | Development Connector |
| F25 | 10A | OBD2 Diagnostics |
| F26 | - | - |
| F27 | - | - |
| F28 | - | - |
| F29 | - | Transmission Control Unit |
| F30 | - | Transmission Control Unit |
Luggage compartment fuse box:
| Fuse/Relay N° | Rating | Functions |
| F1 | 30A | Transmission Control Unit |
| F2 | 30A | Transmission Control Unit |
| F3 | 30A | Air Conditioning - Motor - Control Module |
| F4 | 50A | Secondary Fuse Box Supply |
| F5 | 20A | Electronic Stability Control Valves |
| F6 | 40A | Electronic Stability Control Motor |
| F7 | 20A | Auxiliary Power Socket - Luggage Compartment |
| F8 | 40A | Secondary Fuse Box Supply |
| F9 | 100A | Electro Hydraulic Power Assisted Steering |
| F10 | 200A | Main Fuse Box Supply |
| F11 | 30A | Secondary Fuse Box Supply |
