2018 GMC Acadia Fuse Box Diagram & Amperage
Detailed Guide to 2018 GMC Acadia Fuse Box Locations, Amperages, and Protected Circuits
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Quick Answer
The 2018 GMC Acadia features three main fuse box locations: one under the hood, one in the instrument panel (dash kick-panel) on the passenger side, and one in the rear cargo area.
Under-hood Fuse Box
The under-hood fuse box is located in the engine compartment on the driver's side, near the battery. It contains fuses and relays for critical engine functions, lighting, and other high-current circuits. Always disconnect the negative battery terminal before servicing the under-hood fuse box.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 20A | Yellow | Powertrain Control Module (PCM)/Engine Control Module (ECM) |
| F2 | 15A | Blue | Fuel Pump Relay |
| F3 | 10A | Red | Ignition Coils/Ignition System |
| F4 | 25A | Clear | Starter Solenoid |
| F5 | 15A | Blue | Low Beam Headlights (Left) |
| F6 | 15A | Blue | Low Beam Headlights (Right) |
| F7 | 10A | Red | High Beam Headlights (Left) |
| F8 | 10A | Red | High Beam Headlights (Right) |
| F9 | 20A | Yellow | Blower Motor Relay |
| F10 | 10A | Red | ABS Module/Stability Control |
| F11 | 15A | Blue | Trailer Brake Control (if equipped) |
| F12 | 20A | Yellow | Cooling Fan 1 |
| F13 | 20A | Yellow | Cooling Fan 2 |
| F14 | 10A | Red | HVAC Blower Relay (High Speed) |
| F15 | 15A | Blue | Air Conditioning (A/C) Clutch |
| F16 | 10A | Red | Horn |
| F17 | 30A | Green | Power Steering |
Relay Locations (Under-hood):
- Fuel Pump Relay: Typically located near fuse F2. Controls power to the fuel pump.
- Starter Relay: Often near fuse F4. Engages the starter motor.
- Blower Motor Relay: Usually found near fuse F9. Controls the main cabin blower motor.
- Cooling Fan Relays (2): Typically near fuses F12 and F13. Control the engine cooling fans.
- A/C Clutch Relay: Near fuse F15. Engages the A/C compressor clutch.
Instrument Panel Fuse Box (Passenger Side Kick-Panel)
The instrument panel fuse box is located behind a cover on the passenger side kick-panel, next to the floorboard. This box typically houses fuses for interior electrical components, infotainment, power accessories, and some lighting.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 10A | Red | Radio/Infotainment System |
| F2 | 15A | Blue | Cigar Lighter/12V Power Outlet (Front) |
| F3 | 20A | Yellow | Power Windows (Front) |
| F4 | 10A | Red | ABS/Traction Control Module (Interior Power) |
| F5 | 10A | Red | Airbag (SIR) Module |
| F6 | 10A | Red | Instrument Cluster |
| F7 | 5A | Tan | HVAC Control Module |
| F8 | 15A | Blue | Wiper Motor (Front) |
| F9 | 10A | Red | Turn Signals/Hazard Lights |
| F10 | 15A | Blue | Interior Lighting/Dome Lights |
| F11 | 20A | Yellow | Power Sunroof (if equipped) |
| F12 | 10A | Red | OnStar/Communication System |
| F13 | 15A | Blue | Heated Seats (Driver) |
| F14 | 15A | Blue | Heated Seats (Passenger) |
| F15 | 10A | Red | Body Control Module (BCM) Keep Alive Memory |
| F16 | 20A | Yellow | Power Liftgate (if equipped) |
Rear Cargo Area Fuse Box
Some 2018 GMC Acadia models may have an additional fuse box located in the rear cargo area, often behind a removable panel on the driver's side. This box typically covers rear accessories, trailer wiring, and additional power outlets.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 15A | Blue | 12V Power Outlet (Rear Cargo) |
| F2 | 10A | Red | Tail Lights/Park Lights (Left) |
| F3 | 10A | Red | Tail Lights/Park Lights (Right) |
| F4 | 10A | Red | Brake Lights (Left) |
| F5 | 10A | Red | Brake Lights (Right) |
| F6 | 20A | Yellow | Trailer Wiring (Stop/Turn) |
| F7 | 20A | Yellow | Trailer Wiring (Park/Tail) |
| F8 | 15A | Blue | Rear Wiper Motor |
| F9 | 10A | Red | Rear Defogger |
| F10 | 20A | Yellow | USB Charging Ports (Rear) |
Note on Trim Variations: Fuse locations and amperages can vary slightly based on your Acadia's specific trim level and installed options. Always consult the fuse legend printed on the inside of your fuse box cover for the most accurate information for your vehicle.
How to Test a Fuse
Testing a fuse is a straightforward process:
- Safety First: Ensure the vehicle is off and the key is removed from the ignition. For under-hood fuses, disconnect the negative battery terminal.
- Locate the Fuse: Remove the fuse box cover and identify the suspect fuse using the corresponding diagram.
- Inspect Visually: A blown fuse will often have a broken wire or a melted appearance inside the plastic housing.
- Use a Multimeter or Fuse Tester: For a more accurate test, use a multimeter set to measure continuity or a dedicated fuse tester. Touch the probes to the test points on top of the fuse. If there's no continuity (or the fuse tester light doesn't illuminate), the fuse is blown.
- Replace: If the fuse is blown, replace it with a new fuse of the exact same amperage rating and type. Never substitute a higher-rated fuse, as this can lead to serious electrical damage or fire.
Common Blown Fuses on This Vehicle
While any fuse can blow, certain circuits are more prone to issues. If you're experiencing an electrical problem, consider checking these circuits first:
- Cigar Lighter/12V Outlets (F2 in Instrument Panel, F1 in Rear Cargo): These fuses commonly blow due to overloaded accessories or faulty plugs. Always ensure the devices you plug in are within the amperage limits.
- Blower Motor (F9 in Under-hood): A malfunctioning blower motor, a clogged cabin air filter, or even debris in the blower assembly can cause this fuse to blow.
- Headlights (F5, F6, F7, F8 in Under-hood): While less common with modern LED/HID systems, a short in the wiring or a faulty bulb (if applicable) can still cause a headlight fuse to blow. If only one headlight is out, check its specific fuse.
- Radio/Infotainment (F1 in Instrument Panel): Issues here can range from internal component failures to external shorts if aftermarket accessories have been installed.
- Trailer Brake (F11 in Under-hood, F6, F7 in Rear Cargo): If you frequently tow, a short in the trailer wiring or an overloaded trailer electrical system can easily blow these fuses. Inspect your trailer's wiring harness for damage.
Always start by verifying the simplest explanations—ensure the component is properly plugged in, no visible damage, and then check the associated fuse.
Find a trusted shop on Repairius.
Before you pull a fuse on the 2018 GMC Acadia
- 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 2018 GMC Acadia
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
2018 GMC Acadia 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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