Fixing a Blown Fuse: 2021 Toyota Highlander Fuse Diagram and Relay Guide
Fixing a blown fuse is an important skill for any car owner to have so that their car works properly and they stay safe on the road. If you want to quickly fix electrical problems in your 2021 Toyota Highlander, you need to know how to read the switch diagram and relay guide. This complete guide gives drivers important information about how the vehicle’s fuses are set up and where the relays are located, making it easier to find and repair faulty fuses. This guide makes it easier to understand Highlander’s complicated network of fuses and switches, whether you need to fix problems with the interior lights, power windows, or important safety systems like airbags. With simple explanations and clear diagrams, drivers can confidently find their way around the electrical system, restoring usefulness and peace of mind while driving the 2021 Toyota Highlander.
2023 – 2024 Toyota Highlander Review, Price, Features, Mileage (Brochure)
Checking and replacing fuses
If any of the electrical components do not operate, a fuse may have blown. If this happens, check and replace the fuses as necessary.
Checking and replacing fuses
- Turn the engine switch off.
- Open the fuse box cover.
Engine compartment: type A fuse box (if equipped)
Push the tab in and lift the lid off.
Engine compartment: type B fuse box
Push the tab in and lift the lid off.
Under the driver’s side instrument panel
Remove the lid.
Make sure to push the claw when removing/installing the lid.
- Remove the fuse.
Only type A fuse can be removed using the pullout tool.
- Check if the fuse is blown.
Replace the blown fuse with a new fuse of an appropriate amperage rating. The amperage rating can be found on the fuse box lid.
Type A
- Normal fuse
- Blown fuse
Type B
- Normal fuse
- Blown fuse
Type C
- Normal fuse
- Blown fuse
2023 – 2024 Toyota Highlander Review, Price, Features, Mileage (Brochure)
After a fuse is replaced
- If the lights do not turn on even after the fuse has been replaced, a bulb may need replacement.
- If the replaced fuse blows again, have the vehicle inspected by your Toyota dealer.
If there is an overload in a circuit
The fuses are designed to blow, protecting the wiring harness from damage.
When replacing light bulbs
Toyota recommends that you use genuine Toyota products designed for this vehicle. Because certain bulbs are connected to circuits designed to prevent overload, non-genuine parts or parts not designed for this vehicle may be unusable.
WARNING
To prevent system break-downs and vehicle fire
Observe the following precautions.
Failure to do so may cause damage to the vehicle, and possibly a fire or injury.
- Never use a fuse of a higher amperage rating than that indicated, or use any other object in place of a fuse.
- Always use a genuine Toyota fuse or equivalent.
Never replace a fuse with a wire, even as a temporary fix. - Do not modify the fuses or fuse boxes.
NOTICE
Before replacing fuses
Have the cause of electrical overload determined and repaired by your Toyota dealer as soon as possible.
How to Replace the Fuse of the 2021 Toyota Highlander
Replacing a fuse in the 2021 Toyota Highlander is a straightforward process, ensuring the swift restoration of electrical functions within the vehicle. Here’s a step-by-step guide:
Materials:
- The new fuse of the correct amperage.
- Fuse puller or needle-nose pliers.
Instructions:
- Locate the Fuse Box: The fuse box in the Toyota Highlander is typically located either under the dashboard on the driver’s side or in the engine compartment.
- Turn Off the Vehicle: Before you start replacing the fuse, make sure the vehicle is turned off completely to avoid any electrical mishaps.
- Identify the Blown Fuse: Using the fuse diagram on the inside of the fuse box cover, identify the fuse that corresponds to the malfunctioning component.
- Remove the Blown Fuse: Using a fuse puller tool or a pair of needle-nose pliers, carefully grip and pull out the blown fuse from its slot. Be gentle to avoid damaging the fuse or the fuse box.
- Inspect the Fuse: Take a close look at the fuse to confirm that it’s blown. A blown fuse will have a broken filament or a discoloured appearance.
- Select a Replacement Fuse: Refer to the fuse diagram to determine the appropriate amperage and type of fuse needed for replacement. It’s essential to use a fuse with the same amperage rating as the blown one to ensure safe operation.
- Insert the New Fuse: Carefully insert the new fuse into the empty slot, making sure it fits securely. Avoid forcing the fuse into place.
- Test the Component: Once the new fuse is in place, turn on the vehicle and test the component associated with the fuse to ensure that it’s functioning correctly.
- Replace the Fuse Box Cover: If applicable, replace the fuse box cover and ensure it’s securely in place.
- Dispose of the Blown Fuse: Safely dispose of the blown fuse, as it’s no longer usable
Tips:
- Always use a fuse with the correct amperage rating to prevent electrical issues or damage to the vehicle.
FAQs
The fuse box in a 2022 Toyota Highlander is typically located in the engine compartment.
The Highlander usually has two fuse boxes: one in the engine compartment and another inside the cabin.
Fuses protect electrical components by breaking the circuit if there is an overload or short circuit, preventing damage to the components or electrical system.
Look for a fuse with a broken filament or a discoloured appearance.
You typically only need a pair of needle-nose pliers or the fuse puller tool provided in the fuse box.
No, it’s not recommended. Always replace a blown fuse with the same amp rating to avoid damaging your vehicle’s electrical system.
The interior fuse box is usually located near the driver’s sidekick panel or beneath the dashboard.
Many vehicles come with spare fuses in the fuse box or a compartment near it.
Blown fuses can result from issues like a short circuit, faulty electrical components, or overloading the system
Locate the fuse for the headlights in the fuse box, use the fuse puller or pliers to remove the blown fuse, and replace it with a new one of the same rating.
Yes, replacing a blown fuse is a simple task that can be done without professional assistance, provided you follow safety precautions and use the correct replacement fuses.
If you repeatedly blow fuses, it may indicate an underlying electrical issue. Consult a professional mechanic to diagnose and fix the problem.
Some vehicles have transparent fuses, allowing you to visually inspect them without removal. However, for most fuses, you need to remove them for a thorough inspection.
It depends on the function of the blown fuse. Certain fuses control critical systems, and driving without them may not be safe or feasible.
Replacement fuses are widely available at auto parts stores, and some general retailers may also carry them. Ensure you get the correct amp rating for your specific needs.
Useful Links
View Full PDF: Toyota Highlander 2021 User Manual | Auto User Guide
2023 – 2024 Toyota Highlander Review, Price, Features, Mileage (Brochure)
2021 Toyota Highlander Warning Symbols | Instrument Cluster Guide