Replacing Fuses: 2020 GMC Savana Fuse Diagrams and Relay
Fuse boxes are very important parts of a car’s complicated electrical system because they protect important parts from electrical surges and flaws. For people who own a 2020 GMC Savana, knowing how to change fuses and read the pictures that go with them can be essential for keeping the car running at its best and fixing electrical problems quickly. In this in-depth help, we go over how to change fuses and give you specific information about the 2020 GMC Savana’s fuse diagrams and relays. This guide is meant to help you understand and feel confident about managing your car’s electrical systems, no matter how much you know about DIY projects or how new you are to car care.
2023 – 2024 GMC SAVANA Specs, Price, Features, Mileage and Review
Electrical System
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 fires caused by electrical problems. Look at the silver-colored band inside the fuse. If the band is broken or melted, replace the fuse. Be sure you replace a bad fuse with a new one of the identical size and rating.
Engine Compartment Fuse Block
The fuse block is in the engine compartment on the driver side of the vehicle.
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 | |
|---|---|
| 1 | ABS motor |
| 2 | ABS module |
| 3 | Right trailer stop lamp/Turn signal lamp |
| 4 | – |
| 5 | – |
| 6 | Fuel system control module/Ignition |
| 7 | Body Control Module 5 |
| 8 | Body Control Module 7 |
| 9 | Body control module 4 |
| 10 | Instrument cluster |
| 11 | Trailer wiring |
| 12 | – |
| 13 | Interior rear vision camera module |
| 14 | Windshield washer |
| 16 | Horn |
| 17 | Transmission |
| 18 | A/C |
| 19 | Engine control module battery |
| 20 | Left stop/turn cutaway lamp |
| 21 | Left stop/turn trailer lamp |
| 22 | Right stop/turn cutaway lamp |
| 23 | – |
| 24 | Fuel pump |
| 25 | Auxiliary power outlet |
| 26 | Body control module 3 |
| 27 | Special equipment option |
| 28 | Airbag |
| 29 | Steering wheel sensor |
| 30 | Engine control module/Ignition |
| 31 | Transmission control module Ignition |
| 32 | Transmission control module 1 battery |
| 33 | Rear parking aid module |
| 34 | – |
| 35 | – |
| 36 | Fuel system control module battery |
| 41 | Transmission control module 2, battery signal |
| 42 | Trailer wiring |
| 43 | – |
| 44 | Starter solenoid |
| 45 | Engine control module, powertrain signal 2 |
| 46 | DC-AC inverter |
| 47 | – |
| 51 | Left high-beam headlamp |
| 52 | Right high-beam headlamp |
| 53 | Left low-beam headlamp |
| 54 | Right low-beam headlamp |
| 55 | Wipers |
| 56 | Canister vent solenoid |
| 58 | Body control module 2 |
| 59 | Body control module 1 |
| 61 | Engine oil solenoid |
| 62 | O2 sensor 2 |
| 63 | – |
| 64 | Mass airflow/Canister vent |
| 65 | Ignition coils/injectors – odd |
| 66 | Daytime running lamps 2 |
| 67 | Daytime running lamps 1 |
| 68 | Auxiliary stop lamps |
| 69 | External power for the trailer |
| 70 | Upfitter stop lamps |
| 71 | Fuel heater/FlexFuel sensor |
| 72 | Body Control Module 6 |
| 73 | Lighter/Data link connector |
| 74 | Front blower |
| 75 | Engine control module |
| 76 | – |
| 77 | O2 sensor 1 |
| 78 | Engine control module, powertrain signal 1 |
| 79 | Ignition coils/injectors – even |
| Relays Usage | |
|---|---|
| 15 | Run/Crank |
| 37 | – |
| 38 | Fuel pump |
| 39 | Crank |
| 40 | A/C compressor |
| 48 | – |
| 49 | Powertrain |
| 50 | – |
| 57 | – |
| 60 | – |
Auxiliary Fuse Block
This component is near the fuse block in the engine compartment
| Fuses Usage | |
|---|---|
| MR-1 | Upfitter 1 |
| MR-2 | Upfitter 2 |
| MR-3 | Upfitter power control |
| Relays Usage | |
|---|---|
| MR Rel 1 | Upfitter 1 |
| MR Rel 2 | Upfitter 2 |
Mega Fuse Holder
| Fuse Usage | |
|---|---|
| 1 | Starter motor |
Floor Console Fuse Block
The floor console fuse block is under the driver’s seat.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
| Mini-Fuses Usage | |
|---|---|
| F1 | – |
| F2 | Steering wheel sensor |
| F3 | Auxiliary parking lamps |
| F4 | Front parking lamps |
| F5 | Trailer parking lamps |
| F6 | Upfitter/Parking lamps |
| F7 | Right rear parking lamp |
| F8 | Left rear parking lamp |
| F9 | Exterior rear mirror switch/Door lock-unlock control upfitter/Front camera module |
| F10 | Airbag/Automatic occupant sensing |
| F11 | – /OnStar |
| F12 | ECM batt V6 gas |
| F13 | HVAC 2 |
| F14 | HVAC 1 |
| F15 | Reflected LED display |
| F16 | Upfitter aux 1/Gas ambulance |
| F17 | Heated outside mirrors |
| F18 | Rear window defogger |
| F19 | Compass |
| F20 | Radio/Chime/SiriusXM satellite radio |
| F21 | Remote function actuator/Tire pressure monitor |
| F22 | Ignition switch/Discrete logic ignition sensor |
| F23 | Instrument cluster |
| F24 | – |
| F25 | HVAC control |
| F26 | Auxiliary/Trailer reverse lamps |
| F27 | Reverse tail lamps |
| F28 | Upfitter 2/Reading lamps/Ambulance |
| F29 | Rear blower |
| F30 | Upfitter/Courtesy lamps |
| F31 | Front door lock |
| F32 | Rear door lock |
| F33 | Cargo door unlock |
| F34 | Passenger door unlock |
| F35 | The rear passenger door unlock |
| F36 | Driver door lock |
| F37 | – |
| F38 | – |
| Relays Usage | |
|---|---|
| K1 | Run |
| K2 | – |
| K3 | Parking lamps |
| K4 | Upfitter 2 |
| K5 | Rear window defogger |
| K6 | Retained accessory power |
| Circuit Breakers Usage | |
|---|---|
| CB1 | Power seats |
| CB2 | Power windows |
How to Replace the Fuses of GMC Savana
Here’s a step-by-step guide:
- Locate the Fuse Box: The fuse box in a GMC Savana is typically located in the engine compartment or under the dashboard on the driver’s side. Open the hood or access the interior fuse panel depending on the fuse you need to replace.
- Identify the Blown Fuse: Inspect the fuse panel to identify the fuse that needs to be replaced. Blown fuses will have a broken wire inside the fuse, or the metal strip may appear melted.
- Turn Off the Vehicle: Before you start replacing the fuse, ensure that the vehicle’s ignition is turned off. This prevents any electrical mishaps during the replacement process.
- Use Fuse Puller or Pliers: If your vehicle is equipped with a fuse puller, use it to carefully remove the blown fuse from its slot. Alternatively, you can use a pair of needle-nose pliers to gently pull out the fuse.
- Replace with Same Rating Fuse: Select a replacement fuse with the same amperage rating as the blown fuse. Using a fuse with a different rating can cause electrical problems or damage to the vehicle’s systems.
- Insert the New Fuse: Carefully insert the new fuse into the empty slot, ensuring it is seated securely. Do not force the fuse into place as this could cause damage to the fuse or fuse panel.
- Check Other Fuses: While you’re replacing the blown fuse, it’s a good idea to check the surrounding fuses as well. Look for any signs of damage or wear and replace as necessary.
- Test the Circuit: After replacing the fuse, turn the vehicle’s ignition back on and test the circuit to ensure that the issue has been resolved. If the fuse blows again immediately, there may be an underlying electrical problem that requires further investigation.
Tips:
- Always carry spare fuses of various amperage ratings in your vehicle in case of emergencies.
- Inspect the fuse box regularly for signs of corrosion or damage, as this can affect the performance of the fuses.
FAQs
To replace a fuse, first, locate the fuse box, usually found in the engine compartment or under the dashboard. Identify the blown fuse, remove it using fuse pullers or pliers, and insert a new fuse of the same amperage rating into the empty slot.
A blown fuse can be identified by visually inspecting the metal strip inside the fuse. If it appears broken or melted, the fuse is likely blown.
The fuse box is typically located in the engine compartment or under the dashboard on the driver’s side of the vehicle.
No, it’s crucial to replace a blown fuse with a fuse of the same amperage rating to prevent electrical issues or damage to the vehicle’s systems.
Using a fuse with the wrong amperage rating can cause electrical overload, leading to potential damage to the vehicle’s wiring or components.
Yes, it’s essential to turn off the vehicle’s ignition before replacing a fuse to prevent electrical accidents or damage.
While fuse pullers can make the process easier, they’re not strictly necessary. Needle-nose pliers can also be used to remove and replace fuses.
It’s a good idea to inspect the fuses regularly, especially if you’re experiencing electrical issues in your vehicle.
Yes, you can use a fuse tester to check the fuses without removing them from the fuse box.
Yes, the fuses are typically labeled to indicate their function and amperage rating, making them easy to identify.
If you’re having trouble removing a fuse, try using a pair of needle-nose pliers for better grip.
Yes, visually inspecting the fuse is one way to determine if it’s blown. Look for a broken or melted metal strip inside the fuse.
Yes, always wear safety glasses and gloves to protect yourself from potential electrical hazards.
Apply gentle pressure to the new fuse to ensure it’s properly seated in the slot.
Useful Links
View Full PDF: GMC Savana 2020 User Manual | Auto User Guide
2023 – 2024 GMC SAVANA Specs, Price, Features, Mileage and Review