Fuse Diagrams: 2018 GMC Acadia Relay and Fuses Guide
In the complicated world of car electrical systems, knowing how your vehicle’s relays and fuses are set up is like having a plan to its most important functions. The 2018 GMC Acadia’s switch and fuse guide is very detailed, but it contains a lot of useful information for fixing electrical problems and making sure the car runs at its best. This detailed guide shows how the car’s electrical system is put together and can be used as a help by both experienced enthusiasts and new drivers. This guide gives drivers the information they need to easily fix electrical problems, from figuring out what each relay and fuse does to precisely navigating the layout of the fuse box. The 2018 GMC Acadia relay and fuse guide is an essential tool that makes it easy to fix problems with your car, whether you need to figure out the confusing symbols on the fuse box cover or find the part that’s causing the problem.
2023 GMC ACADIA Specs, Price, Features and Mileage (Brochure)
Electrical System
High Voltage Devices and Wiring
Warning
Exposure to high voltage can cause shock, burns, and even death. The high-voltage components in the vehicle can only be serviced by technicians with special training. High-voltage components are identified by labels. Do not remove, open, take apart, or modify these components. High voltage cable or wiring has orange covering or labels. Do not probe, tamper with, cut, or modify high voltage cables or wiring.
Electrical System Overload
The vehicle has fuses and circuit breakers to protect against an electrical system overload. When the current electrical load is too heavy, the circuit breaker opens and closes, protecting the circuit until the current load returns to normal or the problem is fixed. This greatly reduces the chance of circuit overload and fire caused by electrical problems. Fuses and circuit breakers protect power devices in the vehicle. Replace a bad fuse with a new one of the identical size and rating. If there is a problem on the road and a fuse needs to be replaced, the same amperage fuse can be borrowed. Choose some feature of the vehicle that is not needed to use and replace it as soon as possible.
Headlamp Wiring
An electrical overload may cause the lamps to go on and off, or in some cases to remain off. Have the headlamp wiring checked right away if the lamps go on and off or remain off.
Windshield Wipers
If the wiper motor overheats due to heavy snow or ice, the windshield wipers will stop until the motor cools and will then restart. Although the circuit is protected from electrical overload, overload due to heavy snow or ice may cause wiper linkage damage. Always clear ice and heavy snow from the windshield before using the windshield wipers. If the overload is caused by an electrical problem and not snow or ice, be sure to get it fixed.
Fuses and Circuit Breakers
The wiring circuits in the vehicle are protected from short circuits by a combination of fuses and circuit breakers. This greatly reduces the chance of damage caused by electrical problems.
Danger
Fuses and circuit breakers are marked with their ampere rating. Do not exceed the specified amperage rating when replacing fuses and circuit breakers. Use of an oversized fuse or circuit breaker can result in a vehicle fire. You and others could be seriously injured or killed.
To check a fuse, look at the silver-colored band inside the fuse. If the band is broken or melted, replace the fuse. Be sure to replace a bad fuse with a new one of the identical size and rating. Fuses of the same amperage can be temporarily borrowed from another fuse location, if a fuse goes out. Replace the fuse as soon as possible.
Engine Compartment Fuse Block
The underhood fuse block is in the engine compartment, on the driver side of the vehicle.
Caution
Do not pull the engine compartment fuse block lever, since it is intended only for service purposes. If pulled, vehicle malfunction may occur. Spilling liquid on any electrical component on the vehicle may damage it. Always keep the covers on any electrical component.
To remove the fuse block cover, press the clips on the cover and lift it straight up. The vehicle may not be equipped with all of the fuses, relays, and features shown.
| Fuse | Usage |
|---|---|
| F1 | Antilock brake system |
| F2 | Starter 1 |
| F3 | DC DC transformer 1 |
| F4 | – |
| F5 | – |
| F6 | – |
| F7 | DC DC transformer 2 |
| F8 | Starter 3 |
| F9 | – |
| F10 | – |
| F11 | – |
| F12 | Front wiper |
| F13 | Starter 2 |
| F14 | LED/Automatic headlamp leveling |
| F15 | Rear wiper 1 |
| F16 | – |
| F17 | – |
| F18 | Automatic headlamp leveling module |
| F19 | – |
| F20 | – |
| F21 | – |
| F22 | Electronic brake control module |
| F23 | Parking/Trailer lamps |
| F24 | Right trailer stoplamp/Turn signal lamp |
| F25 | Steering column lock |
| F26 | – |
| F27 | Left trailer stoplamp/Turn signal lamp |
| F28 | – |
| F29 | – |
| F30 | Washer pump |
| F31 | Headlamp low-beam right |
| F32 | Headlamp low-beam left |
| F33 | Fog lamps |
| F34 | Horn |
| F35 | – |
| F36 | Headlamp high-beam left |
| F37 | Headlamp high-beam right |
| F38 | Automatic headlamp leveling motor |
| F39 | Transmission control module 1 |
| F40 | Left rear bus electrical center/Ignition |
| F41 | Instrument cluster |
| F42 | Heating, ventilation, and air conditioning |
| F43 | Head-up display |
| F44 | – |
| F45 | – |
| F46 | – |
| F47 | – |
| F48 | Rear wiper 2 |
| F49 | Interior rearview mirror/Trailer |
| F50 | Fuel system control module |
| F51 | Heated steering wheel |
| F52 | Air conditioning clutch |
| F53 | Transmission range control module |
| F54 | Coolant pump |
| F55 | – |
| F56 | – |
| F57 | Engine control module/Ignition |
| F58 | Transmission control module/Ignition |
| F59 | Engine control module battery |
| F60 | Transmission control module 2 |
| F61 | O2 sensor 1/Aeroshutter |
| F62 | Engine control module – odd |
| F63 | O2 sensor 2 |
| F64 | Engine control module – even |
| F65 | Engine control module powertrain 1 |
| F66 | Engine control module powertrain 2 |
| F67 | Powertrain TRCM |
| F68 | – |
| F69 | – |
| F70 | – |
| F71 | – |
| F72 | – |
| F73 | – |
| F74 | – |
| F75 | – |
| F76 | – |
| F77 | – |
| Relay | Usage |
|---|---|
| K1 | Starter 1 |
| K2 | Run/Crank |
| K3 | Starter 3 |
| K4 | LED/Automatic headlamps |
| K5 | – |
| K6 | Coolant pump |
| K7 | Engine control module |
| K8 | Air conditioning |
| K9 | – |
| K10 | Starter 2 |
Instrument Panel Fuse Block
The instrument panel fuse block is inside the center console on the passenger side of the vehicle. See the fuse block cover for specific fuse information. Open the fuse panel door, or remove the panel from the passenger side by pulling it out.
To reinstall the door, push the door back into its original location.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
| Fuse | Usage |
|---|---|
| F1 | Body control module 6 |
| F2 | Diagnostic link |
| F3 | Electric steering column lock |
| F4 | – |
| F5 | Logistics |
| F6 | Heating, ventilation, and air conditioning |
| F7 | Body control module 3 |
| F8 | Head-up display (if equipped) |
| F9 | Right front heated seat |
| F10 | Airbag/Seat belt |
| F11 | Electronic precision shift |
| F12 | Amplifier |
| F13 | Body control module 7 |
| F14 | Left front heated seat |
| F15 | Instrument panel switch bank |
| F16 | Sunroof |
| F17 | Body control module 1 |
| F18 | Instrument cluster |
| F19 | – |
| F20 | Rear seat entertainment |
| F21 | Body control module 4 |
| F22 | Infotainment USB data/Aux jack |
| F23 | Body control module 2 |
| F24 | USB charger/Wireless charging |
| F25 | Parking assist |
| F26 | CIM |
| F27 | Video |
| F28 | Heating, ventilation, and air conditioning display |
| F29 | Radio |
| F30 | Steering wheel adjustment controls |
| F31 | Front blower |
| F32 | DC AC inverter |
| F33 | Driver power seat |
| F34 | Passenger power seat |
| F35 | Battery IEC 1 feed |
| F36 | Electric power steering |
| F37 | Rear seat entertainment/USB charge/Wireless charging module |
| F38 | Body control module 8 |
| F39 | – |
| Circuit Breakers | Usage |
|---|---|
| F40 | – |
| F41 | – |
| F42 | Auxiliary power outlet/Lighter |
Rear Compartment Fuse Block
The rear compartment fuse block is behind a trim panel on the driver side of the rear storage compartment.
Remove the side bin, load floor, and foam. Remove the trim plate to access the fuse block. The label for this fuse block is in the spare tire area, on the foam under the cargo floor.
| Fuses | Usage |
|---|---|
| F1 | – |
| F2 | Trailer battery 1 |
| F3 | Driver seat belt motor |
| F4 | Rear blower |
| F5 | Rear drive control |
| F6 | Passenger seat belt motor |
| F7 | Right window |
| F8 | Rear defogger |
| F9 | Left window |
| F10 | – |
| F11 | Trailer reverse |
| F12 | – |
| F13 | – |
| F14 | – |
| F15 | – |
| F16 | – |
| F17 | Camera |
| F18 | Trailer module |
| F19 | Ventilated seats |
| F20 | – |
| F21 | Trailer connector |
| F22 | – |
| F23 | – |
| F24 | Passenger window switch |
| F25 | – |
| F26 | Trailer brake |
| F27 | Driver ventilated seat/Lumbar |
| F28 | Passive entry/Passive start |
| F29 | – |
| F30 | Canister vent |
| F31 | – |
| F32 | Heated mirror |
| F33 | – |
| F34 | Liftgate module |
| F35 | Fuel system control module |
| F36 | Passenger ventilated seat/Lumbar |
| F37 | – |
| F38 | Window module |
| F39 | Rear closure |
| F40 | Memory seat module |
| F41 | Automatic occupancy sensor |
| F42 | Trailer battery 2 |
| F43 | – |
| F44 | – |
| F45 | Liftgate motor |
| F46 | Rear heated seats |
| F47 | – |
| F48 | Glass break sensor |
| F49 | – |
| F50 | – |
| F51 | – |
| F52 | Active dampening system module |
| F53 | Rear parking aid module/Video/USB |
| F54 | External object calculating/Side blind zone alert |
| F55 | – |
| F56 | Universal garage door opener/Rain sensor |
| F57 | Theft deterrent |
| Circuit Breakers | Usage |
|---|---|
| CB1 | – |
| CB2 | – |
| CB3 | Rear auxiliary power outlet |
| Relays | Usage |
|---|---|
| K1 | – |
| K2 | – |
How to Replace the Fuses of GMC Acadia
Replacing the fuses in a GMC Acadia involves a straightforward process.
Here’s a step-by-step guide along with some useful tips:
- Locate the Fuse Box: The fuse box in the GMC Acadia is typically located under the dashboard on the driver’s side or under the hood near the battery. It may be concealed by a cover that needs to be removed.
- Identify the Blown Fuse: Use a flashlight to inspect the fuses. Look for any fuses with a broken filament inside or those with a discolored appearance, indicating they have blown.
- Turn Off the Ignition: Before replacing any fuses, ensure that the vehicle’s ignition is turned off to prevent any electrical mishaps.
- Remove the Blown Fuse: Using a fuse puller or a pair of needle-nose pliers, carefully grip the blown fuse and pull it straight out of its slot. Be gentle to avoid damaging the fuse box or surrounding components.
- Insert the Replacement Fuse: Position the replacement fuse into the empty slot in the fuse box. Make sure it is seated securely and properly aligned with the terminals.
- Check Other Fuses: While you’re at it, it’s a good idea to check other fuses as well, even if they appear to be intact. This can help prevent future electrical issues.
- Replace the Fuse Box Cover: If applicable, reinstall the fuse box cover securely to protect the fuses and wiring from dust and moisture.
- Test the Electrical System: Once all the fuses have been replaced, turn the ignition back on and test the relevant electrical systems to ensure they are functioning properly.
- Dispose of Old Fuses: Safely dispose of any blown or old fuses. Avoid throwing them in the trash; instead, recycle them properly.
Tips:
- Always use replacement fuses with the correct amperage rating to avoid electrical damage or fires.
- Keep a variety of spare fuses of different amperages in your vehicle in case of emergencies.
- Regularly inspect and replace fuses as needed to maintain the electrical integrity of your vehicle.
FAQs
The fuse diagrams in the 2018 GMC Acadia serve as a visual guide to the location and function of each fuse and relay in the vehicle’s electrical system.
There are typically multiple fuse diagrams in the 2018 GMC Acadia, covering different areas of the vehicle’s electrical system, such as the interior fuse box and the engine compartment fuse box.
The fuse diagrams are usually located in the fuse box covers, which can be found in the interior of the vehicle and under the hood.
The fuse diagrams show the layout of the fuse boxes and identify each fuse and relay by its location and function.
The fuse diagrams use symbols and labels to indicate the purpose of each fuse and relay, allowing you to quickly identify which component is protected by each fuse.
Yes, the fuse diagrams are tailored to the 2018 GMC Acadia model and may vary from other vehicle models or model years.
While the fuse diagrams are standardized for the 2018 GMC Acadia, you can annotate or customize them for your specific requirements, such as adding labels or highlighting specific fuses.
It’s a good practice to familiarize yourself with the fuse diagrams and check them periodically, especially if you experience recurring electrical issues or add aftermarket accessories to your vehicle.
Always disconnect the battery before replacing fuses or relays to prevent electrical shock or damage to the vehicle’s electrical system. Additionally, use the appropriate fuse puller tool to avoid damaging the fuses or fuse box.
No special tools are required to access the fuse diagrams, but having a flashlight and a fuse puller tool can make the process easier, especially when working in low-light conditions or tight spaces.
While official fuse diagrams may not be available online, you can find aftermarket resources or forums where other vehicle owners may have shared fuse diagrams or troubleshooting tips for the 2018 GMC Acadia.
Common issues related to fuses and relays in the 2018 GMC Acadia include blown fuses, faulty relays, and electrical shorts, which can cause various electrical components to malfunction or stop working.
To prevent fuse-related issues, avoid overloading the vehicle’s electrical system by using accessories with the correct amperage rating, and regularly inspect and replace worn or damaged fuses.
Useful Links
View Full PDF: 2018 GMC Acadia Owner’s Manual | Auto User Guide
2023 GMC ACADIA Specs, Price, Features and Mileage (Brochure)