Fuses Guide: 2020 GMC Terrain Relay and Fuse Diagrams
Sometimes getting around in your 2020 GMC Terrain’s power system can feel like figuring out a hard puzzle. It’s important to know how the relays and fuses are laid out in order to keep and fix your car’s electrical parts. This complete guide goes into great depth about relays and fuses, showing you how they work and giving you clear explanations and diagrams to help you understand them better. If you want to change a blown fuse or figure out what’s wrong with your electricity, this guide will give you the information and confidence you need to do the job. Come with us as we look at the 2020 GMC Terrain’s electrical system from the inside out. This will give you the knowledge to keep your car running well.
2023 – 2024 GMC TERRAIN Review, Price, Features and Mileage (Brochure)
Electrical System
Electrical System Overload
The vehicle has fuses and circuit breakers to protect against an electrical system overload. When the electrical load current 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. 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. There is a fuse puller in the engine compartment fuse block. See Engine Compartment Fuse Block. It can be used to easily remove fuses from the fuse block. To identify and check fuses, circuit breakers, and relays see Engine Compartment Fuse Block or Instrument Panel Fuse Block and Rear Compartment Fuse Block.
Engine Compartment Fuse Block
To remove the fuse block cover, squeeze the clips on the cover and lift it straight up.
Caution
Spilling liquid on any electrical component on the vehicle may damage it. Always keep the covers on any electrical component.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
| Fuses Usage | |
|---|---|
| F01 Starter 1 | K01 Starter solenoid |
| F02 Starter 2 | K05 Starter solenoid 2 |
| F03 Lambda sensor 1 | K03 Engine control module |
| F04 Engine control module | K03 Engine control module |
| F05 FlexFuel sensor | |
| F06 Transmission control module | |
| F07 – | |
| F08 Engine control module | K03 Engine control module |
| F09 Air conditioning clutch | K02 Air conditioning control |
| F10 Canister vent solenoid | |
| F11 Fuel system | |
| F12 Front heated seats | |
| F13 Engine coolant pump | |
| F14 – | |
| F15 Lambda sensor 2 | |
| F16 Ignition coils | |
| F17 Engine control module | K03 Engine control module |
| F18 Selective catalytic reduction module (diesel only) | |
| F19 NOx soot sensor (diesel only) | |
| F20 DC DC converter 2 | |
| F21 Shift control | |
| F22 Antilock brake pump | |
| F23 Front/Rear washer pump | |
| F24 – | |
| F25 Diesel fuel heater (diesel only) | |
| F26 – | |
| F27 Antilock brake valves | |
| F28 LD trailer | |
| F29 Rear window defogger | K15 Rear window defogger |
| F30 Mirror defroster | |
| F31 – | |
| F32 Variable functions | |
| F33 – | |
| F34 Horn | K16 Horn |
| F35 – | |
| F36 Right high-beam headlamp | |
| F37 Left high-beam headlamp | |
| F38 Automatic headlamp leveling | |
| F39 Fog lamps | K18 Fog lamps |
| F40 – | |
| F41 Transmission range control module | |
| F42 Motorized headlamp | |
| F43 – | |
| F44 Interior rearview mirror | |
| F45 Passenger side ventilated seat | |
| F46 Driver side ventilated seat | |
| F47 Steering column lock assembly | |
| F48 Rear wiper | K23 Rear wiper control |
| F49 – | |
| F50 Heated steering wheel | K19 Coolant pump |
| F51 Right daytime running lamp | |
| F52 Engine control module/Transmission control | |
| F53 – | |
| F54 – | |
| F55 Front wiper speed/Control | |
| F56 – | |
| F57 Left daytime running lamp |
Instrument Panel Fuse Block
The instrument panel fuse block is under the instrument panel on the driver side. To access the fuses, press and release the latch near the top center square. Apply pressure to the two retaining tabs on the sides of the cover, until the two retaining tabs clear the sides of the instrument panel. Allow the panel to move downward and out of the way. To reinstall the cover, reverse the steps. The vehicle may not be equipped with all of the fuses and relays shown.
| Fuses Usage | |
|---|---|
| F01 DC AC inverter | |
| F02 Front windows | |
| F03 Trailer brake | K05 Logistics |
| F04 Heating, ventilation, and air conditioning blower | |
| F05 Body control module 2 | |
| F06 CGM | |
| F07 – | |
| F08 Body control module 3 | |
| F09 Amplifier | |
| F10 – | |
| F11 – | |
| F12 – | |
| F13 – | |
| F14 Electronic shifter | |
| F15 Transmission control module | |
| F16 Front heated seats | |
| F17 Left data link connector | |
| F18 Body control module 7 | |
| F19 Exterior mirror | |
| F20 Body control module 1 | |
| F21 Body control module 4 | |
| F22 Body control module 6 | |
| F23 Electric steering column lock | |
| F24 Sensing and diagnostic module | |
| F25 Occupancy sensor | |
| F26 – | |
| F27 Power seats | |
| F28 Rear windows | |
| F29 – | |
| F30 Front heated seats switch | |
| F31 Steering wheel controls | |
| F32 Body control module 8 | |
| F33 Heating, ventilation, and air conditioning | |
| F34 Passive entry, passive start | |
| F35 Liftgate latch | |
| F36 Wireless charger module/USB accessory | |
| F37 Cigarette lighter | |
| F38 OnStar | |
| F39 Instrument panel USB | |
| F40 Camera module/Liftgate module | |
| F41 Park assist module | |
| F42 Radio |
Rear Compartment Fuse Block
The rear compartment fuse block is behind a trim panel on the side of the rear compartment.
Remove the trim plate to access the fuse block. The vehicle may not be equipped with all of the fuses and relays shown.
| Fuses Usage | |
|---|---|
| F1 Exhaust fuel heater/Selective catalytic reduction power module (diesel only) | |
| F2 Liftgate | |
| F3 Trailer auxiliary power | |
| F4 Passenger Power Seat | |
| F5 Memory seat module | |
| F6 Sunroof | |
| F7 Side blind zone alert | |
| F8 Trailer reverse lamps | |
| F9 Rear heated seat 1 | |
| F10 Park Lamps | |
| F11 Rear heated seat 2 | |
| F12 – | |
| F13 Trailer parking lamp | |
| F14 Right trailer stop lamp/Turn signal lamp | |
| F15 Left parking lamp | |
| F16 Right parking lamp | |
| F17 Video processing module | |
| F18 Left trailer stop lamp/Turn signal lamp | |
| F19 All-wheel drive | |
| F20 Lumbar | |
| F21 Rear auxiliary power outlet | |
| F22 Rear drive unit |
| Relays Usage | |
|---|---|
| K1 Right trailer stop lamp/Turn signal lamp | |
| K2 Trailer reverse lamps | |
| K3 Left trailer stop lamp/Turn signal lamp | |
| K4 Parking lamps | |
| K5 Exhaust fuel heater/Selective catalytic reduction power module (diesel only) |
How to Replace the Fuses of GMC Terrain
To replace the fuses in your GMC Terrain, follow these steps:
- Locate the Fuse Box: The fuse box in the GMC Terrain is typically located in the engine bay or under the dashboard on the driver’s side. It’s usually a rectangular or square-shaped box with a removable lid.
- Turn Off the Engine: Before you start replacing any fuses, make sure the engine is turned off and the key is removed from the ignition to prevent any electrical accidents.
- Identify the Blown Fuse: Use a flashlight to inspect the fuses inside the fuse box. Look for any fuses with a broken filament or a discolored appearance, indicating they are blown.
- Remove the Blown Fuse: Using a fuse puller tool 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.
- Replace with a New Fuse: Once the blown fuse is removed, insert a new fuse of the same amperage rating into the empty slot. Make sure it fits snugly but is not forced in.
- Check Other Fuses: While you’re in the fuse box, it’s a good idea to check the condition of the other fuses as well. Look for any signs of wear or damage and replace as needed.
- Close the Fuse Box: After replacing the blown fuse and checking others, securely close the fuse box lid to protect the fuses and electrical connections.
- Test the Electrical Component: Turn on the ignition and test the electrical component associated with the fuse you replaced to ensure it’s functioning properly.
Tips:
- Always use a fuse with the same amperage rating as the one you’re replacing. Using a fuse with a higher or lower rating can cause electrical issues or even damage the vehicle’s electrical system.
- Keep a variety of spare fuses of different amperages in your vehicle in case of emergencies.
FAQs
Fuses protect electrical circuits from overloading, which can cause damage or fire hazards.
The 2020 GMC Terrain typically has two fuse boxes: one in the engine compartment and one in the interior cabin.
Yes, fuses often have a transparent casing that allows you to see if the fuse element inside is intact or blown.
If a fuse is blown, it means that the metal strip or wire inside the fuse has melted due to overcurrent, interrupting the electrical circuit.
Generally, no special tools are required. However, having a fuse puller or a pair of needle-nose pliers can make the task easier.
Yes, it’s important to replace a blown fuse with one of the same rating to ensure proper protection of the electrical circuit.
Before replacing a fuse, it’s crucial to turn off the vehicle’s ignition and disconnect the battery to avoid electrical shock or damage.
Use a fuse puller tool or a pair of needle-nose pliers to grasp the blown fuse and gently pull it straight out of its socket.
Yes, many vehicles come equipped with spare fuses stored in the fuse box or included in the vehicle’s emergency roadside kit.
Yes, sometimes a fuse can fail without any visible signs of damage, so it’s essential to use a multimeter to test fuses if you suspect an electrical issue.
It’s a good idea to inspect fuses regularly during routine maintenance checks or whenever you encounter an electrical problem.
Are there any common reasons why fuses might blow in the 2020 GMC Terrain?
Can you mix fuses with different amp ratings in the 2020 GMC Terrain?
No, mixing fuses with different amp ratings can result in electrical damage or fire hazards, so it’s crucial to use fuses of the correct rating.
If a fuse repeatedly blows immediately after replacement, it may indicate a short circuit in the electrical system that needs to be addressed.
Useful Links
View Full PDF: GMC Terrain 2020 User Manual | Auto User Guide
2023 – 2024 GMC TERRAIN Review, Price, Features and Mileage (Brochure)
2020 GMC Terrain Display Setting | How to use Display Screen