2023 McLaren 720S Fuses and Fuse Box Diagram User Guide
Discover the 2023 McLaren 720S fuse box layout, including fuse positions, functions, and amperage ratings. Understand how to securely locate and replace blown fuses to keep your supercar’s electrical systems—lighting, infotainment, cooling, and more—running smoothly.
2023 McLaren 720S Specs, Price, Features, Mileage and Review
Video: 2023 McLaren 720S Fuses
Fuses
Fuse replacement
WARNING: Fuses protect the vehicle’s electrical systems. The failure of any fuse will render the system it protects inoperative. Use replacement fuses of the same rating and type. Incorrect fuse ratings can overload a system and cause a fire or malfunction. Blown fuses should be replaced and no attempt should be made to repair a blown fuse.
NOTE: Before removing a fuse, turn off all electrical equipment and switch off the ignition. There are three fuse boxes fitted to your McLaren.
|
Fuse Box |
Location |
| Main fuse box | Behind a panel in the rear bulkhead, behind the left-hand seat. |
| Secondary fuse box | Below the dashboard on the passenger’s side. |
| Battery fuse box | On top of the battery, in the luggage compartment, beneath the luggage compartment cover. |
Main fuse box
Main fuse box access
- To access the main fuse box:
- if a manual seat is fitted, lift the tilt release lever and tilt the left-hand seat backrest forwards
- if an electric seat is fitted, pull the release strap (shown above) and tilt the left-hand seat backrest forwards
- if a race seat is fitted, slide the seat forwards
- Release the two lower clips securing the panel to the bulkhead and remove the panel
- Refer to the fuse specification to determine which fuse protects the non-functioning electrical system, see Main fuse box fuse specification chart
NOTE: A label identifying the fuses is attached to the inside of the access panel. - Remove the appropriate fuse and replace it with a fuse of the same value as the original. If in doubt, check the fuse specification chart.
- Fit the access panel by inserting the two upper retaining clips in the bulkhead and securing it with the two lower clips.
NOTE: If a replacement fuse does not solve the electrical problem, or it fails immediately, contact your McLaren retailer. Main fuse box fuse specification chart
| No. | Amps | Circuit protected |
| F1 | 60 | Right-Hand Secondary Air Pump |
| F2 | 60 | Left-Hand Secondary Air Pump |
| F3 | 20 | Tonneau Motor Right-Hand (Spider Models Only) |
| F4 | 20 | Tonneau Motor Left-Hand (Spider Models Only) |
| F5 | 30 | Transmission Control Unit |
| F6 | 30 | Transmission Control Unit |
| F7 | 30 | Starter |
|
No. |
Amps |
Circuit protected |
| F8 | 30 | Heated Rear Window |
| F9 | 30 | Audio Amplifier (16 Channel) |
| F10 | 20 | Roof Central ECU (Spider Models Only) |
| F11 | 20 | Roof Central ECU (Spider Models Only) |
| F12 | 20 | Roof Main Motor Left-Hand (Spider Models Only) |
| F13 | 5 | Transmission Control Unit |
| F14 | 5 | Engine Control Module |
| F15 | 10 | Relays |
| F16 | – | – |
| F17 | 3 | Door Locking Switch |
| F18 | 50 | ECU Main Relay Feed |
| F19 | 40 | Fuel Pump |
|
No. |
Amps |
Circuit protected |
| F20 | 30 | Seat Driver’s |
| F21 | 30 | Seat Passenger’s |
| F22 | 20 | Roof Main Motor Right-Hand (Spider Models Only) |
| F23 | 5 | Tilt and Microwave Sensor |
| F24 | 20 | Infotainment Control Unit |
| F25 | 10 | Driver’s/Passenger’s Door Latch |
| F26 | 3 | Auxiliary USB Board |
| F27 | – | – |
| F28 | – | – |
| F29 | – | – |
| F30 | – | – |
| F31 | 50 | Cooling Fan Left-Hand |
| F32 | 50 | Cooling Fan Right-Hand |
|
No. |
Amps |
Circuit protected |
| F33 | – | – |
| F34 | – | – |
| F35 | – | – |
| F36 | 20 | ECM Power Supply |
| F37 | 15 | Canister Purge, Lambda Sensors, Cooling Fan Relay Coil |
| F38 | 15 | Fuel Injection and Ignition – Left-Hand Bank |
| F39 | 15 | Fuel Injection and Ignition – Right-Hand Bank |
| F40 | 10 | Engine Ancillaries |
| R41 | – | – |
| R42 | – | – |
| R43 | – | – |
| R44 | – | – |
|
No. |
Amps |
Circuit protected |
| F45 | 10 | Electrical Thermostats, Camshaft Actuators |
| F46 | 3 | Output Shaft Speed, Even Gear Shaft Speed |
| F47 | 3 | Input Shaft Speed, Odd Gear Shaft Speed |
| F48 | – | – |
| F49 | 5 | Starter |
| R50 | – | – |
| R51 | – | Heated Rear Window |
| R52 | – | – |
| R53 | – | Transmission Control Unit |
| R54 | – | Transmission Control Unit |
| R55 | – | Starter |
| R56 | – | Secondary Air Pump RH |
|
No. |
Amps |
Circuit protected |
| F45 | 10 | Electrical Thermostats, Camshaft Actuators |
| F46 | 3 | Output Shaft Speed, Even Gear Shaft Speed |
|
No. |
Amps |
Circuit protected |
| R57 | – | Cooling Fans |
| R58 | – | ECU Main Relay Feed |
720S Secondary fuse box
Secondary fuse box access
- Access to the secondary fuse box is gained by lowering the closing panel below the dashboard on the passenger’s side.
- Remove the two front screws (1).
- Remove the side fixing clip (2). NOTE: If you wish to lower the closing panel fully, also remove the two clips at the rear (3).
- Lower the closing panel, sufficiently to gain access to the fuse box. NOTE: Do not lower the closing panel further than necessary as it could be damaged.
- Remove the appropriate fuse and replace it with a fuse of the same value as the original. If in doubt, check the fuse specification chart, see the Secondary fuse box fuse specification chart
- Raise the closing panel into position, fit the clip and fit and tighten the two front screws.
Secondary fuse box fuse specification chart
|
No. |
Amps |
Circuit protected |
| F1 | 20 | Driver’s Door |
| F2 | 20 | Passenger’s Door |
| F3 | 25 | Lights |
| F4 | 35 | Lights |
| F5 | 35 | Body |
| F6 | 35 | Body |
| F7 | 35 | Alarm |
| F8 | – | – |
| F9 | – | – |
| F10 | – | – |
| F11 | – | – |
| F12 | – | – |
| F13 | – | – |
|
No. |
Amps |
Circuit protected |
| F14 | 5 | Transmission Control Unit |
| F15 | 10 | Air Conditioning |
| F16 | 3 | Alarm Control Unit |
| F17 | 3 | Tracker |
| F18 | 7.5 | Alarm |
| F19 | 5 | Central Display |
| F20 | 3 | Transmission Control Unit Relays |
| F21 | 15 | Display Control Unit |
| F22 | – | – |
| F23 | 5 | Driver Display |
| F24 | 10 | Development Connector |
| F25 | 10 | OBD2 Diagnostics |
| F26 | – | – |
|
No. |
Amps |
Circuit protected |
| F27 | – | – |
| F28 | – | – |
| R29 | – | Transmission Control Unit |
| R30 | – | Transmission Control Unit |
Battery fuse box
Battery fuse box access
- Open the luggage compartment lid and remove any items stowed inside.
- Remove the 2-quarter turn screws securing the top of the battery access cover.
- Open the top of the battery access cover and disconnect the 2 electrical connectors on the back of the cover.
- Lift the battery access cover upwards, off its locating pegs, and remove it.
- Press the 2 catches on the right-hand sideof the cover and remove the cover from the fuse box.
- Remove the appropriate fuse and replace it with a fuse of the same value as the original. If in doubt, see the Battery fuse box fuse specification chart.
- Engage the left-hand side of the cover with the fuse box, and push the right-hand side down to fully engage the clips.
- Refit the battery access cover, connect the 2 electrical connectors and secure it with the 2 screws.
- Stow the contents removed from the luggage compartment.
Battery fuse box fuse specification chart
|
No. |
Amps |
Circuit protected |
| F1 | 30 | Transmission Control Unit |
| F2 | 30 | Transmission Control Unit |
| F3 | 30 | Air Conditioning – Motor – Control Module |
| F4 | 50 | Secondary Fuse Box Supply |
| F5 | 40 | Electronic Stability Control Valves |
| F6 | 40 | Electronic Stability Control Motor |
| F7 | 20 | Auxiliary Power Socket – Luggage Compartment |
| F8 | 40 | Secondary Fuse Box Supply |
| F9 | 100 | Electro-Hydraulic Power Assisted Steering |
| F10 | 200 | Main Fuse Box Supply |
|
No. |
Amps |
Circuit protected |
| F11 | 30 | Secondary Fuse Box Supply |
How to replace fuse in McLaren 720S 2023
- Find the fuse box.
- In a McLaren 720S, the fuse box is usually in the engine bay or somewhere that can be reached from the driver’s cabin.
- Find the Blown Fuse:
- To find the blown fuse, look at the fuses or use a voltmeter to check them. Usually, you can see a broken wire inside the fuse or something that looks different.
- Turn Off the Car:
- Before you work on the switches, make sure the engine is off and the key is out of the ignition. This will keep you from messing up the electricity.
- Remove the Fuse:
- Carefully take the blown fuse out of its hole with a fuse puller tool or a pair of needle-nose pliers. Be careful not to damage the switch box or the parts around it.
- “Replace the Fuse”:
- Put in a new fuse with the same value and amperage range. To avoid electrical problems or damage to the car’s systems, it’s important to use a fuse with the right grade.
- Check for Continuity:
- After changing the fuse, make sure the new fuse is working right by setting a multimeter to continuity mode. This step makes sure the circuit is finished and ready to be used.
- Securely close the fuse box after replacing the fuse and making sure it works. This will protect the fuses and keep the electrical links working right.
- Click “Test the System.”
- Start the car and check the system that the new fuse is connected to to make sure it’s working right. You’ve successfully changed the fuse if everything works as it should.
Useful Links
View Full PDF: 2023 McLaren 720S Owner’s Manual|Auto User Guide
2023 McLaren 720S Specs, Price, Features, Mileage and Review
2023 McLaren 720S Specifications and Features Guide