2016 Toyota Highlander Fuse Box Diagram & Amperage
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Quick answer
Your 2016 Toyota Highlander has three main fuse box locations:
- Engine compartment (under-hood): On the driver's side of the engine bay, near the battery.
- Driver's side instrument panel: Located under the dashboard, to the left of the steering column.
- Passenger's side instrument panel: Located behind a trim panel on the side of the dashboard, accessible when the passenger door is open.
Engine Compartment Fuse Box
This fuse box contains higher-amperage fuses and relays that protect critical engine and chassis systems. Always disconnect the negative battery terminal before servicing these fuses.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| 1 | 50A | Red | ABS, VSC, TRAC systems |
| 2 | 30A | Pink | ABS, VSC, TRAC systems |
| 3 | 30A | Pink | Headlight cleaning system |
| 4 | 50A | Red | Main starting system |
| 5 | 140A | - | Alternator, main power |
| 6 | 50A | Red | Blower motor |
| 7 | 30A | Pink | Cooling fans |
| 8 | 10A | Red | A/C clutch |
| 9 | 10A | Red | Horn |
| 10 | 15A | Blue | EFI (Electronic Fuel Injection) |
| 11 | 30A | Pink | Main ignition |
| 12 | 10A | Red | Fuel pump |
| 13 | 10A | Red | Starter motor relay |
| 14 | 15A | Blue | Low beam headlights (Right) |
| 15 | 15A | Blue | Low beam headlights (Left) |
| 16 | 10A | Red | High beam headlights (Right) |
| 17 | 10A | Red | High beam headlights (Left) |
| 18 | 10A | Red | Fog lights |
| 19 | 10A | Red | Daytime Running Lights (DRL) |
| 20 | 15A | Blue | Trailer towing |
| 21 | 30A | Pink | Trailer brake controller |
| R1 | - | Black | Starter Relay |
| R2 | - | Black | Ignition Relay |
| R3 | - | Black | Fuel Pump Relay |
| R4 | - | Black | A/C Clutch Relay |
Note: This is a common configuration. Always verify the fuse layout with the diagram on the inside of the fuse box cover.
Driver's Side Instrument Panel Fuse Box
This fuse box is located under the dashboard on the driver's side and protects most of the interior circuits.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| 22 | 10A | Red | ECU-IG NO. 1 (Engine Control Unit) |
| 23 | 10A | Red | SRS Airbag system |
| 24 | 15A | Blue | Power outlet (Center console) |
| 25 | 15A | Blue | Cigarette lighter/12V outlet |
| 26 | 20A | Yellow | Power seats |
| 27 | 10A | Red | Stop lights (Brake lights) |
| 28 | 7.5A | Brown | Tail lights, parking lights |
| 29 | 10A | Red | Turn signals, hazard lights |
| 30 | 7.5A | Brown | Interior lights |
| 31 | 10A | Red | Gauges and meters |
| 32 | 15A | Blue | Audio system/infotainment |
| 33 | 7.5A | Brown | Power mirrors |
| 34 | 25A | Natural | Power windows (Driver's door) |
| 35 | 10A | Red | Heated seats |
Passenger's Side Instrument Panel Fuse Box
This smaller fuse box is on the passenger side and handles additional interior and body control circuits.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| 36 | 7.5A | Brown | Smart Key system |
| 37 | 7.5A | Brown | Body Control Module (BCM) |
| 38 | 5A | Tan | Instrument panel illumination |
| 39 | 10A | Red | Sunroof |
| 40 | 7.5A | Brown | Windshield wipers |
How to test a fuse
A blown fuse can be identified in two ways:
- Visually inspect the fuse: Pull the fuse from its slot using a fuse puller (often located in the fuse box cover). Hold the fuse up to the light. Inside the plastic body is a thin metal strip. If this strip is broken or melted, the fuse is blown and needs to be replaced.
- Use a multimeter: Set your multimeter to the continuity setting. Touch the probes to each of the two metal prongs on the top of the fuse. If the multimeter beeps or shows a reading of near-zero ohms, the fuse is good. If it remains silent or shows "OL" (over limit), the fuse is blown.
When replacing a fuse, always use a new fuse of the exact same amperage rating. Using a higher-rated fuse can cause a fire.
Common blown fuses on this vehicle
- Cigar Lighter/12V Power Outlet: The 15A Cigarette lighter fuse (number 25) is one of the most common to blow. This is often caused by a faulty phone charger or other device plugged into the outlet. Before replacing the fuse, unplug any devices and check the outlet for foreign objects like a coin that may have fallen inside and caused a short.
- Radio/Infotainment: If your radio is dead, check the 15A "Audio system/infotainment" fuse (number 32) in the driver's side instrument panel. This can sometimes blow for no apparent reason, but if it blows repeatedly, there may be an issue with the head unit or the vehicle's wiring that requires professional diagnosis.
- Trailer Towing Circuits: If you tow a trailer and the trailer lights are not working, first check the 15A "Trailer towing" fuse (number 20) and the 30A "Trailer brake controller" fuse (number 21) in the under-hood fuse box. The most common cause is a wiring short in the trailer's wiring harness.
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Before you pull a fuse on the 2016 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 2016 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
2016 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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