Fixing a Blown Fuse: 2020 GMC Yukon Relay and Fuse Diagrams
When it comes to the 2020 GMC Yukon, the relay and fuse designs are very important for making sure that all of the electrical parts work right. These diagrams give a complete picture of the fuses and switches, which is necessary for finding problems and figuring out where certain circuits are. When you have an electrical problem, like a blown fuse, you need to be able to read and understand these images in order to quickly figure out what’s wrong and fix it. With clear pictures and labels, drivers and techs can quickly find the fuse or relay that is broken, which speeds up repairs and reduces downtime.
2023 – 2024 GMC YUKON Review, Specs, Price and Mileage (Brochure)
Electrical System
Electrical System Overload
The vehicle has fuses to protect against an electrical system overload. Fuses also 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, there are some spare fuses and a fuse puller in the left instrument panel fuse block. The same amperage fuse can also 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 engine compartment fuse block is in the engine compartment, on the driver’s side of the vehicle.
Lift the cover to access the fuse block.
Caution
Spilling liquid on any electrical component on the vehicle may damage it. Always keep the covers on any electrical component.
A fuse puller is available in the left instrument panel fuse block.
| Fuse | Usage |
|---|---|
| 1 | Power assist steps |
| 2 | Antilock brake system pump |
| 3 | Interior BEC LT1 |
| 4 | Passenger motorized seat belt |
| 5 | Suspension leveling compressor |
| 6 | 4WD transfer case electronic control |
| 7 | – |
| 8 | – |
| 10 | Electric parking brake/– |
| 11 | – |
| 12 | – |
| 13 | Interior BEC LT2 |
| 14 | Rear BEC 1 |
| 15 | – |
| 16 | – |
| 17 | Driver motorized seat belt |
| 18 | – |
| 19 | – |
| 20 | – |
| 21 | Automatic headlamp leveling/Exhaust solenoid |
| 22 | Fuel pump |
| 23 | Integrated chassis control module |
| 24 | Real-time dampening |
| 25 | Fuel pump power module |
| 26 | Active Hydraulic Assist/Battery regulated voltage control |
| 27 | – |
| 28 | Upfitter 2 |
| 30 | Wiper |
| 31 | Trailer interface module |
| 32 | – |
| 33 | – |
| 34 | Reverse lamps |
| 35 | Antilock brake system valve |
| 36 | Trailer brakes |
| 38 | – |
| 39 | Right trailer stop lamp/Turn signal lamp |
| 40 | Left trailer stop lamp/turn signal lamp |
| 41 | Trailer parking lamps |
| 42 | Right parking lamps |
| 43 | Left parking lamps |
| 44 | Upfitter 3 |
| 45 | Automatic level control/Run/Crank |
| 46 | – |
| 47 | Upfitter 4 |
| 49 | Reverse lamps |
| 50 | – |
| 52 | – |
| 53 | – |
| 54 | – |
| 55 | – |
| 56 | – |
| 57 | – |
| 58 | – |
| 59 | Euro trailer |
| 60 | Air conditioning control |
| 61 | – |
| 62 | – |
| 63 | Upfitter 1 |
| 64 | – |
| 65 | – |
| 66 | – |
| 67 | Trailer battery |
| 68 | Secondary fuel pump |
| 69 | RC upfitter 3 and 4 |
| 70 | VBAT upfitter 3 and 4 |
| 71 | – |
| 73 | – |
| 74 | The engine control module/Ignition |
| 75 | Miscellaneous/Ignition/– |
| 76 | Transmission/Ignition |
| 77 | RC upfitter 1 and 2 |
| 78 | VBAT upfitter 1 and 2 |
| 79 | – |
| 80 | – |
| 81 | – |
| 82 | – |
| 83 | Euro trailer/RC |
| 85 | – |
| 86 | – |
| 87 | MAF/IAT/Humidity/TIAP sensor |
| 88 | Injector A – odd |
| 89 | Injector B – even |
| 90 | O2 sensor B |
| 91 | Throttle control |
| 93 | Horn |
| 94 | Fog lamps |
| 95 | High-beam headlamps |
| 96 | – |
| 97 | – |
| 98 | – |
| 99 | – |
| 100 | O2 sensor A |
| 101 | Engine control module |
| 102 | Engine control module/Transmission control module |
| 103 | Auxiliary interior heater |
| 104 | Starter |
| 105 | – |
| 106 | – |
| 107 | Aeroshutter |
| 108 | – |
| 109 | Police upfitter |
| 110 | – |
| 111 | – |
| 113 | – |
| 114 | Front windshield washer |
| 115 | Rear window washer |
| 116 | Left cooling fan |
| 117 | Fuel pump prime |
| 118 | – |
| 119 | – |
| 120 | – |
| 121 | Right HID headlamp |
| 122 | Left HID headlamp |
| 123 | Right cooling fan |
| Relay | Usage |
|---|---|
| 9 | Fuel pump |
| 29 | Upfitter 2 |
| 37 | Upfitter 3 |
| 48 | Upfitter 4 |
| 51 | Parking lamp |
| 64 | Secondary fuel pump |
| 72 | Upfitter 1 |
| 84 | Run/Crank |
| 92 | Engine control module |
| 112 | Starter |
| 120 | Fuel pump prime |
Instrument Panel Fuse Block (Right)
The right instrument panel fuse block access door is on the passenger side edge of the instrument panel. Pull off the cover to access the fuse block.
There are relays on the back of the fuse block. To access, press the tabs and remove the fuse block. The vehicle may not be equipped with all of the fuses, relays, and features shown.
| Fuse | Usage |
|---|---|
| 1 | – |
| 2 | – |
| 3 | – |
| 4 | Accessory power outlet 4 |
| 5 | – |
| 6 | – |
| 7 | – |
| 8 | Glove box |
| 9 | – |
| 10 | – |
| 11 | – |
| 12 | Steering wheel controls |
| 13 | Body Control Module 8 |
| 14 | – |
| 15 | – |
| 16 | – |
| 17 | – |
| 18 | – |
| 19 | Body control module 4 |
| 20 | Rear seat entertainment |
| 21 | Sunroof/beacon officer |
| 22 | – |
| 23 | – |
| 24 | – |
| 25 | – |
| 26 | Infotainment/Airbag |
| 27 | –/RF window switch/Rain sensor |
| 28 | Obstacle detection/USB |
| 29 | Radio |
| 30 | – |
| 31 | – |
| 32 | – |
| 33 | – |
| 34 | – |
| 35 | – |
| 36 | Special equipment option B2 |
| 37 | Special equipment option |
| 38 | Body control module 2 |
| 39 | DC to AC inverter |
| 40 | – |
| 41 | – |
| 42 | – |
| 43 | – |
| 44 | Right door window motor |
| 45 | Front blower |
| 46 | Body Control Module 6 |
| 47 | Body Control Module 7 |
| 48 | Amplifier |
| 49 | Right front seat |
| 50 | Accessory power outlet 3 |
| 56 | – |
| Relay | Usage |
|---|---|
| 51 | – |
| 52 | Retained accessory power |
| 53 | – |
| 54 | – |
| 55 | – |
Instrument Panel Fuse Block (Left)
The left instrument panel fuse block access door is on the driver-side edge of the instrument panel. Pull off the cover to access the fuse block.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
| Fuse | Usage |
|---|---|
| 1 | – |
| 2 | – |
| 3 | – |
| 4 | Accessory power outlet 1 |
| 5 | Accessory power outlet from retained accessory power |
| 6 | Accessory power outlet from battery power |
| 7 | Universal garage door opener/SEO Roof beacon switch |
| 8 | SEO/Retained accessory power |
| 9 | – |
| 10 | Body control module 3 |
| 11 | Body Control Module 5 |
| 12 | Steering wheel control backlighting |
| 13 | – |
| 14 | – |
| 15 | – |
| 16 | Discrete logic ignition sensor |
| 17 | Video processing module/Virtual key module |
| 18 | Mirror window module |
| 19 | Body control module 1 |
| 20 | Front bolster |
| 21 | – |
| 22 | – |
| 23 | – |
| 24 | HVAC ignition/AUX HVAC ignition |
| 25 | Instrument cluster/Ignition sensing diagnostic module ignition |
| 26 | Tilt column/Tilt column lock 1/SEO 1/SEO 2 |
| 27 | Data link connector/Driver seat module |
| 28 | Passive entry, Passive start/HVAC battery/CGM |
| 29 | Content theft deterrent |
| 30 | – |
| 31 | – |
| 32 | – |
| 33 | SEO Automatic level control/Left heated seat |
| 34 | Park enable/Electric adjustable pedal |
| 35 | – |
| 36 | Miscellaneous/Run crank |
| 37 | Heated steering wheel |
| 38 | Steering column lock 2 |
| 39 | Instrument cluster battery |
| 40 | – |
| 41 | – |
| 42 | Euro trailer |
| 43 | Left doors |
| 44 | Driver power seat |
| 45 | – |
| 46 | Right heated, cooled, or ventilated seat |
| 47 | Left heated, cooled, or ventilated seat |
| 48 | – |
| 49 | – |
| 50 | Accessory power outlet 2 |
| 56 | – |
| Relay | Usage |
|---|---|
| 51 | – |
| 52 | Retained accessory power |
| 53 | Run crank |
| 54 | – |
| 55 | – |
Rear Compartment Fuse Block
The rear compartment fuse block is behind the access panel on the left side of the compartment. Pull the panel out by grabbing the finger access slot at the rear edge.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
| Fuse | Usage |
|---|---|
| 2 | – |
| 3 | Right-heated second-row seat |
| 4 | Heated mirrors |
| 5 | Liftgate |
| 6 | Glass breakage |
| 7 | Liftglass |
| 8 | Liftgate module logic |
| 9 | Rear wiper |
| 10 | Rear heating, ventilation, and air conditioning blower |
| 11 | Second-row seat folding |
| 12 | Liftgate module |
| 13 | Third-row seat folding |
| 14 | Rear accessory power outlet |
| 15 | Rear window defogger |
| 19 | Rear fog lamp |
| Relay | Usage |
|---|---|
| 1 | Rear window defogger |
| 16 | Liftgate |
| 17 | Liftglass |
| 18 | Rear fog lamp |
| 20 | Heated mirror |
How to Replace the Fuses of GMC Yukon
Replacing the fuses in your GMC Yukon is a straightforward process that can be done easily with a few simple steps.
Here’s a detailed guide along with some helpful tips:
- Locate the Fuse Box: The fuse box in your GMC Yukon is typically located in one of three places: under the hood, on the driver’s side dashboard, or under the rear seat.
- Turn Off the Vehicle: Before you begin, ensure that your Yukon’s engine is turned off to prevent any electrical mishaps.
- Identify the Blown Fuse: Use a flashlight to inspect the fuses. Blown fuses often have a broken filament or a discolored appearance. Identify the fuse corresponding to the malfunctioning component.
- Remove the Fuse: Use a fuse puller tool or a pair of needle-nose pliers to grip and gently pull out the blown fuse. If you don’t have a fuse puller, you can also use your fingers, but be careful not to apply too much force.
- Insert the New Fuse: Carefully insert the new fuse into the appropriate slot, ensuring it fits snugly. Avoid forcing the fuse into place, as this can cause damage to the fuse or the fuse box.
- Test the Component: Once the new fuse is installed, turn on the corresponding component (e.g., headlights, radio) to test if it’s functioning properly. If the fuse blows again immediately, there may be an underlying electrical issue that requires further investigation.
- Replace Fuse Box Cover: Once you’ve replaced the fuse, securely reattach the fuse box cover to protect the fuses and ensure safety.
Tips:
- Always carry spare fuses of various amperages in your vehicle’s glove compartment for emergencies.
- Before replacing a fuse, inspect the surrounding area for signs of damage or corrosion, which may indicate an underlying issue.
- Regularly inspect and replace fuses as needed to maintain the electrical system’s integrity and prevent unexpected failures.
By following these steps and tips, you can confidently replace fuses in your GMC Yukon without the need for professional assistance.
FAQs
Relay and fuse diagrams in the 2020 GMC Yukon serve as visual guides to the vehicle’s electrical systems, crucial for troubleshooting and identifying issues.
Understanding these diagrams enables drivers to quickly diagnose and fix electrical problems, such as blown fuses, reducing downtime and potential repair costs.
Basic tools such as fuse pullers and multimeters can aid in safely removing and testing fuses, ensuring accurate diagnosis and repair.
The diagrams typically include labeling or color-coding to indicate the amperage rating of each fuse, guiding drivers in selecting the appropriate replacement.
It’s crucial to disconnect the vehicle’s battery and follow safety protocols to prevent electrical hazards while accessing and replacing fuses.
The diagrams provide a visual map of the vehicle’s electrical system, helping drivers pinpoint the location of relays, fuses, and associated components.
Symptoms such as non-functional lights, power windows, or other electrical accessories can often indicate a blown fuse, prompting drivers to consult the diagrams for diagnosis.
Relays act as switches, controlling the flow of electricity to various components based on signals from the vehicle’s computer system, as illustrated in the diagrams.
By cross-referencing the diagrams with the vehicle’s symptoms, drivers can isolate and test relays to confirm if they are responsible for electrical issues.
Ignoring a blown fuse can lead to further electrical problems or component failures, potentially compromising vehicle safety and functionality, underscoring the importance of prompt repair.
The diagrams provide detailed information on fuse locations and amperage ratings, guiding drivers in selecting compatible replacements and preventing potential damage to the electrical system.
Maintaining accurate records of fuse replacements allows drivers to track maintenance history and identify recurring issues, facilitating proactive troubleshooting and maintenance.
Regular vehicle inspections and proactive maintenance, informed by the relay and fuse diagrams, can help drivers identify potential issues before they escalate, reducing the likelihood of blown fuses.
By empowering drivers to quickly address electrical issues, the relay and fuse diagrams enhance vehicle safety and reliability, ensuring uninterrupted operation on the road.
Monitoring manufacturer communications, subscribing to recall notifications, and regularly checking for updates on the vehicle’s relay and fuse system can help drivers stay informed and proactive about maintenance and safety issues.
Useful Links
View Full PDF: GMC Yukon 2020 User Manual | Auto User Guide
2023 – 2024 GMC YUKON Review, Specs, Price and Mileage (Brochure)