Replacing a Blown Fuse: 2020 Chevrolet Blazer Fuse Diagrams Guide
It’s easy to change a blown fuse in a 2020 Chevrolet Blazer, but you need to know what you’re doing and be shown how to do it safely and correctly. It is very important to understand the fuse diagrams in your car’s instructions so you can find the fuse that is connected to the broken part. Usually, these diagrams show how the fuse box is set up and list the amperage value of each fuse. First, find the fuse box. It’s usually in the kick panel on the driver’s side or under the hood. Once you’ve found it, use the picture to find the bad fuse and write down its amperage so that the new fuse fits. To avoid any electrical problems, it’s important to turn off the engine and disconnect the battery before changing the fuse. After changing the blown fuse with a new one of the same rating, put the cover back on the fuse box and connect the battery again. Lastly, try the circuit that was fixed to make sure the problem is gone. With the help of the fuse diagrams and this organized method, replacing a blown fuse in a 2020 Chevrolet Blazer is made easier, ensuring that all of the car’s electrical parts work at their best.
2024 Chevrolet Blazer Review, Specs, Price 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. The 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-coloured 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’s 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.
To remove the fuse block cover, press the clips on the cover and lift it straight up.
Caution
Spilling liquid on any electrical component of the vehicle may damage it. Always keep the covers on any electrical component.
To remove fuses, use the fuse puller and pull straight out.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
| Fuses | Usage |
| F1 | Antilock brake system pump |
| F2 | Starter 1 |
| F3 | DC-DC transformer 1 |
| F4 | – |
| F5 | DC-DC transformer 2 |
| F6 | – |
| F7 | Front blower |
| F8 | Starter 3 |
| F9 | – |
| F10 | – |
| F11 | – |
| F12 | Front wiper |
| F13 | Starter 2 |
| F14 | – |
| F15 | Rear wiper |
| F16 | – |
| F17 | – |
| F18 | – |
| F19 | – |
| F20 | – |
| F21 | – |
| F22 | Electronic brake control module |
| F23 | Parking/Trailer lamps |
| F24 | Right trailer stoplamp/ Turnlamp |
| F25 | Steering column lock |
| F26 | – |
| F27 | Left trailer stoplamp/ Turnlamp |
| F28 | – |
| F29 | – |
| F30 | Washer pump |
| F31 | Spare/Right low beam headlamp |
| F32 | Left low beam headlamp |
| F33 | High beam headlamp shutter/ Fog lamps |
| F34 | Horn |
| F35 | – |
| F36 | Right low beam/Left high beam headlamp |
| F37 | Spare/Right high beam headlamp |
| F38 | Automatic headlamp leveling motor |
| F39 | Transmission control module |
| F40 | Left rear bus electrical center/DC DC ignition |
| F41 | Instrument cluster |
| F42 | Heating, ventilation, and air conditioning/ Central gateway module run/crank |
| F43 | Reflective light alert display |
| F44 | Electronic brake control module/Electric brake booster/Run/crank |
| F45 | – |
| F46 | – |
| F47 | – |
| F48 | – |
| F49 | Interior rearview mirror |
| F50 | Fuel system control module/Fuel tank zone module run/crank |
| F51 | Heated steering wheel |
| F52 | Air conditioning clutch |
| F53 | – |
| F54 | Coolant pump |
| F55 | – |
| F56 | – |
| F57 | Engine control module/ Ignition |
| F58 | Transmission control module/Ignition |
| F59 | Engine control module battery |
| F60 | – |
| F61 | O2 sensor 1/ Aeroshutter/Mass airflow sensor |
| 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 | Engine control module powertrain 3 |
| F68 | – |
| F69 | – |
| F70 | – |
| F71 | – |
| F72 | – |
| F73 | – |
| F74 | – |
| F75 | – |
| F76 | – |
| F77 | – |
| Relays | Usage |
| K1 | Starter 1 |
| K2 | Run/Crank |
| K3 | Starter 3 |
| K4 | – |
| 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 centre console on the passenger side of the vehicle.
Remove the fuse access door by inserting a coin or tool into the slot of the access door.
To remove a fuse, use the fuse puller located in the Engine Compartment Fuse block.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
| Fuses | Usage |
| F1 | Body Control Module 6 |
| F2 | Diagnostic link/Central gateway module |
| F3 | Electric steering column lock |
| F4 | – |
| F5 | – |
| F6 | Heating, ventilation, and air conditioning |
| F7 | Body control module 3 |
| F8 | – |
| F9 | Right front heated seat |
| F10 | Airbag/Seatbelt |
| F11 | – |
| F12 | Amplifier/Noise control module |
| F13 | Body Control Module 7 |
| F14 | Left front heated seat |
| F15 | – |
| F16 | Sunroof |
| F17 | – |
| F18 | Instrument cluster |
| F19 | Body control module 1 |
| 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 | Park Assist |
| F26 | Communications integration module |
| F27 | – |
| F28 | Heating, ventilation, and air conditioning/ Information communication system display |
| F29 | Radio |
| F30 | Steering wheel adjustment controls |
| F31 | Electric brake control module electric brake booster |
| 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/ Auxiliary power outlet/ Lighter |
| F38 | Body Control Module 8 |
| F39 | – |
| Circuit Breakers/ Minifuse | Usage |
| F40 | – |
| F41 | – |
| F42 | Auxiliary power outlet (CB)/Lighter |
Rear Compartment Fuse Block
The rear compartment fuse block is behind a trim cover on the driver side of the rear storage compartment.
Remove the trim cover to access the fuse block or visit your dealer.
The fuse block label is located on the central bin.
2024 Chevrolet Blazer Review, Specs, Price And Mileage (Brochure)
| Fuses | Usage |
| F1 | – |
| F2 | Trailer battery |
| F3 | – |
| F4 | Rear blower |
| F5 | Rear drive control 1 |
| F6 | – |
| F7 | Right window |
| F8 | Rear window defogger |
| F9 | Left window |
| F10 | – |
| F11 | Trailer reverse |
| F12 | – |
| F13 | – |
| F14 | – |
| F15 | – |
| F16 | – |
| F17 | – |
| F18 | – |
| F19 | – |
| F20 | Glove box door/Trailer stoplamp |
| F21 | – |
| F22 | – |
| F23 | – |
| F24 | – |
| F25 | – |
| F26 | Trailer brake |
| F27 | Driver ventilated seat/ Lumbar |
| F28 | Passive entry/Passive start |
| F29 | – |
| F30 | Canister vent |
| F31 | – |
| F32 | Heated mirrors |
| F33 | – |
| F34 | Liftgate module |
| F35 | Fuel system control module/Fuel tank zone module |
| F36 | Passenger ventilated seat/Lumbar |
| F37 | – |
| F38 | Window module |
| F39 | Rear closure |
| F40 | Memory seat module |
| F41 | Automatic occupancy sensor |
| F42 | – |
| F43 | – |
| F44 | – |
| F45 | Liftgate motor |
| F46 | Rear heated seats |
| F47 | – |
| F48 | – |
| F49 | – |
| F50 | – |
| F51 | – |
| F52 | Rear drive control 2/Semi-active dampening system module |
| F53 | Video |
| F54 | External object calculating/Side blind zone alert |
| F55 | – |
| F56 | Universal remote/Rain sensor |
| F57 | Alarm overhead console/Theft deterrent |
| Circuit Breakers | Usage |
| CB1 | – |
| CB2 | – |
| CB3 | Rear auxiliary power outlet |
| Relays | Usage |
| K1 | – |
| K2 | – |
How to Replace the Fuse of the 2020 Chevrolet Blazer
To replace a fuse in a 2020 Chevrolet Blazer, follow these steps:
Materials:
- The new fuse of the correct amperage.
- Fuse puller or needle-nose pliers.
Instructions:
- Locate the Fuse Box: The fuse box in the 2020 Chevrolet Blazer is typically located in the engine compartment or under the dashboard on the driver’s side.
- Turn Off the Vehicle: Ensure the vehicle is turned off completely before replacing a fuse.
- Identify the Faulty Fuse: Use the diagram on the fuse box cover to locate the fuse corresponding to the malfunctioning component.
- Remove the Fuse: Using fuse pullers or needle-nose pliers, carefully grasp the fuse and pull it straight out of its socket. Be gentle to avoid damaging the fuse or the fuse box.
- Inspect the Fuse: Check the fuse visually or using a multimeter to determine if it’s blown. A blown fuse will have a broken wire inside or appear discoloured.
- Replace the Fuse: If it is blown, replace it with a new fuse with the same amperage rating. Make sure the replacement fuse matches the amperage rating specified for that circuit.
- Install the New Fuse: Carefully insert the new fuse into the appropriate slot in the fuse box. Ensure it is seated securely.
- Close the Fuse Box Cover: If applicable, close the fuse box cover securely.
- Test the Component: Turn on the vehicle and test the component associated with the fuse to verify that it is functioning properly.
- Monitor for Issues: Keep an eye on the component to ensure that the problem does not persist, indicating a larger electrical issue.
Tips:
- Always use a fuse with the correct amperage rating to prevent electrical issues or damage to the vehicle.
FAQs
A common cause is a short circuit or overload in the electrical system.
The fuse box is typically located under the dashboard on the driver’s side or in the engine compartment.
Look for a fuse with a broken wire inside or one that appears discoloured.
You may need a fuse puller or a pair of needle-nose pliers.
No, it’s important to use the correct type and amperage of fuse specified for your vehicle.
Yes, there are blade fuses and mini blade fuses commonly used in modern vehicles.
Typically, different colours signify different amperages of the fuses.
See the fuse diagram in the fuse box cover.
Yes, as long as you follow proper safety precautions and use the correct replacement fuse.
Not necessarily, it may fix minor electrical problems, but larger issues may require professional diagnosis.
Fuses typically last a long time unless there’s a recurring electrical issue.
No, this can lead to electrical damage or even fire hazards. Always use the specified amperage.
It’s generally recommended to disconnect the battery before replacing fuses to avoid electrical mishaps.
Ensure the vehicle is turned off and all electrical components are switched off to prevent shocks or damage.
It’s not recommended, as it may be damaged or weakened from the previous use.
Useful Links
View Full PDF: 2020 Chevrolet Blazer Owners Manual | Auto User Guide
2024 Chevrolet Blazer Review, Specs, Price And Mileage (Brochure)