2023 Toyota Highlander — Fuse Box Diagram & Amperage
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Quick answer
The 2023 Toyota Highlander features three main fuse box locations:
- Under-hood Fuse Box: Located in the engine bay, typically near the battery.
- Driver's Side Instrument Panel Fuse Box: Found on the driver's side, behind a cover in the kick panel area.
- Cargo Area Fuse Box: Situated in the rear cargo area, often behind a trim panel on the driver's side.
Under-hood Fuse Box
The under-hood fuse box in your 2023 Toyota Highlander primarily protects critical engine components, powertrain management, and high-current accessories. Always verify the exact layout with the diagram on your fuse box lid, as variations can occur based on trim level and options.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| EFI NO. 1 | 10A | Red | ECM/PCM (Engine Control Module/Powertrain Control Module) |
| EFI NO. 2 | 10A | Red | Fuel Pump (Main EFI Relay) |
| IGN | 15A | Blue | Ignition System, Coils |
| ST | 5A | Tan | Starter Relay |
| H-LP RH LO | 10A | Red | Right Headlight Low Beam |
| H-LP LH LO | 10A | Red | Left Headlight Low Beam |
| H-LP RH HI | 10A | Red | Right Headlight High Beam |
| H-LP LH HI | 10A | Red | Left Headlight High Beam |
| TAIL | 10A | Red | Tail Lights, Parking Lights |
| STOP | 10A | Red | Brake Lights |
| BLOWER | 40A | Green | Blower Motor (Main) |
| A/C MGC | 10A | Red | A/C Magnetic Clutch (Compressor) |
| ABS MTR | 30A | Green | ABS Pump Motor |
| ABS SOL | 20A | Yellow | ABS Solenoids |
| TOWING B/U | 30A | Green | Trailer Brake Controller (Backup) |
| HORN | 10A | Red | Horn |
| WIPER | 25A | Clear | Windshield Wipers |
| ALT | 120A | Black | Alternator (Main Fuse) |
| ETCS | 10A | Red | Electronic Throttle Control System |
| TOWING (MAIN) | 50A | Red | Trailer Power Supply (Main) |
Relay Locations (Under-hood):
The under-hood fuse box also houses several important relays:
- EFI Main Relay: Powers various engine control components and the fuel pump system.
- Fuel Pump Relay: Controls power to the fuel pump.
- Starter Relay: Engages the starter motor.
- Headlight Relays: Separate relays for low and high beams, sometimes one for each side.
- A/C Compressor Relay: Activates the A/C compressor clutch.
- Horn Relay: Powers the horn.
- Cooling Fan Relays: Controls the engine cooling fans.
Driver's Side Instrument Panel Fuse Box
This fuse box manages many interior electrical components, accessories, and cabin functions. It's typically located behind a small panel on the driver's side, often requiring a trim removal tool or simply prying open a cover.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| GAUGE | 10A | Red | Instrument Cluster, Indicator Lights |
| DOOR | 10A | Red | Interior Lights, Door Locks |
| P/OUTLET NO. 1 | 15A | Blue | 12V Power Outlet (Front/Dash) |
| RADIO NO. 1 | 10A | Red | Radio/Infotainment System (Memory/Constant Power) |
| IGN NO. 2 | 7.5A | Brown | Ignition Switch, ACC Power |
| ACC | 10A | Red | Accessory Power, Infotainment |
| PWR OUTLET NO. 2 | 15A | Blue | 12V Power Outlet (Console/Rear) |
| AIR BAG | 10A | Red | SRS Airbag System |
| WIPER S | 10A | Red | Wiper Switch, Intermittent Wipers |
| DOME | 10A | Red | Dome Lights, Map Lights |
| WASHER | 15A | Blue | Windshield Washer Pump |
| MIRROR | 10A | Red | Power Side Mirrors |
| R/SEAT HTR | 15A | Blue | Rear Seat Heaters (if equipped) |
| FR FOG | 15A | Blue | Front Fog Lights (if equipped) |
Cargo Area Fuse Box
The fuse box in the cargo area typically services rear-specific components, power outlets, and potentially trailer-related circuits. Access is usually by removing a trim panel on the driver's side of the cargo compartment.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| PWR OUTLET NO. 3 | 15A | Blue | 12V Power Outlet (Cargo Area) |
| TOWING B | 20A | Yellow | Trailer Connector (Charging/Auxiliary Power) |
| RR HTR | 25A | Clear | Rear Heater/A/C Fan (if equipped) |
| RR WIPER | 15A | Blue | Rear Wiper |
| RR DEF | 20A | Yellow | Rear Window Defogger |
| TAILGATE | 10A | Red | Power Liftgate Module (if equipped) |
How to test a fuse
Testing a fuse is a straightforward process that can save you time and money. Here's how to do it:
- Locate the Fuse Box: Refer to your vehicle's owner's manual or the Quick Answer section above to find the correct fuse box.
- Identify the Suspect Fuse: Look at the fuse box diagram (often on the inside of the fuse box lid) to find the fuse for the circuit that's not working.
- Visual Inspection: Pull the fuse straight out using a fuse puller (usually included in the fuse box or tool kit). Hold it up to the light. If the metal wire or strip inside is broken or melted, the fuse is blown and needs to be replaced.
- Using a Multimeter (for a more precise test):
- Set your multimeter to the continuity or ohms setting.
- Touch one probe to each metal blade of the fuse.
- If the multimeter beeps or shows a reading of
Before you pull a fuse on the 2023 Toyota Highlander
- Use the label printed on the panel cover or the owner's manual for your exact build. Layouts change with options, model year and build date, so a chart for another truck can be wrong.
- Replace a blown fuse only with the same amp rating. A larger fuse can let wiring overheat.
- A fuse that blows again right away means a short or failing component downstream. Find the cause before replacing it again.
- A good fuse doesn't prove the circuit works — relays, grounds and connectors fail too.
- Disconnect the battery before working near high-current fuses or cables.
Learn more: How fuses, relays and truck electrical systems work
More specs for the 2023 Toyota Highlander
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2023 Toyota Highlander Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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Values can vary by engine, trim and build date; check your VIN-specific service information. Updated 2026-06-17.