2021 McLaren GT Fuses and Fuse Box Guidelines
The McLaren GT 2021 is a remarkable supercar that combines performance and luxury exquisitely, and at the core of its electrical system is a component known as “Fuses and Fuse Box.” These unassuming parts play a crucial role in ensuring the safe and dependable operation of the electrical circuits in a vehicle. In this introduction, we will explore the world of fuses and the fuse box of the 2021 McLaren GT, casting light on their importance in protecting the vehicle’s complex electrical systems. The fuse box in the 2021 McLaren GT protects the numerous electrical functions of the vehicle. Within its compact enclosure, an array of fuses protects against electrical overloads and brief circuits that could disrupt vital systems. These fuses are strategically situated to protect a variety of components, from the lighting and entertainment systems to the engine control units and critical safety features.
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
- 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, page 6.20.
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 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 | – | – |
| F4 | – | – |
| F5 | 30 | Transmission Control Unit |
| No. | Amps | Circuit protected |
| F6 | 30 | Transmission Control Unit |
| F7 | 30 | Starter |
| F8 | 30 | Heated Rear Window |
| F9 | 30 | Audio Amplifier (16 Channel) |
| F10 | – | – |
| F11 | – | – |
| F12 | – | – |
| F13 | 5 | Transmission Control Unit |
| F14 | 5 | Engine Control Module |
| F15 | 10 | Relays |
| F16 | 3 | Tailgate |
| 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 | – | – |
| 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 | 2 | Infotainment |
| F28 | – | – |
| F29 | 20 | Vacuum pump |
| 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 |
| R57 | – | Cooling Fans |
| R58 | – | ECU Main relay Feed |
Extended diagnostic port
The extended diagnostic port is located behind the right-hand seat. This feature can only be used by your McLaren retailer.
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 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 | 10 | Instrument cluster |
| 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 | – | – |
| F24 | 5 | Development Connector |
| F25 | 10 | OBD2 Diagnostics |
| F26 | – | – |
| No. | Amps | Circuit protected |
| F27 | – | – |
| F28 | – | – |
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.
- Press the 2 catches on the right-hand side of 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 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 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 |
What is the purpose of the fuse box in the 2021 McLaren GT?
The 2021 McLaren GT fuse box protects the vehicle’s electrical circuits from overloads and short circuits with fuses.
The fuse box in a McLaren GT is typically located in a convenient and accessible location, typically in the engine compartment or interior cabin.
Frequent indicators include inoperable electrical components, such as the lights, radio, or power windows, and a dashboard warning of a ruptured fuse.
Refer to the owner’s manual to locate the specific fuse, and then use fuse pullers or pliers to remove the blown fuse and replace it with a new fuse of the same amperage.
Refer to the owner’s manual to locate the specific fuse, and then use fuse pullers or pliers to remove the blown fuse and replace it with a new fuse of the same amperage.
No, using a fuse with a higher amperage can result in electrical damage and safety hazards. Always replace the fuse with the specified amperage.
Various systems, including lights, audio, safety features, and engine control units, are protected by fuses.
The fuse box ensures that the correct amount of power is distributed to each system, preventing overloading and potential damage
Some vehicles come equipped with spare fuses, but it is recommended to maintain spare fuses of various amperages in your toolkit.
Consult the owner’s manual, which typically contains a diagram of the fuse box and the associated components.
It is possible to install additional fuses for new accessories on a McLaren GT, but only a qualified technician should do so to assure safety and compliance with the electrical system.
Check the fuses frequently, especially if you experience electrical problems. It is recommended during routine maintenance.
If you frequently burst fuses, it indicates an underlying electrical problem, and you should have a McLaren technician inspect the vehicle.
To ensure safety and prevent electrical accidents, always disengage the vehicle’s battery before handling fuses.
Consult a qualified McLaren technician if you have specific performance or electrical requirements to explore potential solutions, as upgrading fuses is generally not recommended.
Useful Link
View Full PDF: McLaren GT 2021 User Manual | Auto User Guide
2021 McLaren GT Engine Oil and Fluids Operations