2021 Chevrolet Silverado 1500 Fuse Box Diagram & Amperage

Quick Answer

The 2021 Chevrolet Silverado 1500 typically has three main fuse box locations: under the hood, inside the cabin (usually on the passenger side kick panel), and in the cargo area (behind the right rear seat).

Under-Hood Fuse Box (Engine Compartment Fuse Block)

This fuse box is located in the engine compartment, usually on the driver's side near the battery. It contains fuses and relays for critical engine functions, lighting, and other high-current accessories. Always consult the lid of your specific fuse box for the exact layout, as variations can occur based on trim level and options.

Relay Locations (Under-Hood):

• R1 (FPR): Fuel Pump Relay
• R2 (STR): Starter Relay
• R3 (HLR_L): Headlight Low Beam Relay (Left)
• R4 (HLR_R): Headlight Low Beam Relay (Right)
• R5 (HHR_L): Headlight High Beam Relay (Left)
• R6 (HHR_R): Headlight High Beam Relay (Right)
• R7 (AC_C): A/C Clutch Relay
• R8 (FAN1): Cooling Fan Relay 1
• R9 (FAN2): Cooling Fan Relay 2

Instrument Panel Fuse Box (Passenger Side Kick Panel)

This fuse box is located inside the cabin, typically on the passenger side, behind a removable panel in the kick panel area. It controls various interior electrical components and accessories.

Cargo Area Fuse Box (Rear Under-Seat Fuse Block)

Located in the cargo area, often behind the right rear seat or under the rear bench. This fuse box typically handles power for rear accessories, trailer wiring, and sometimes the rear HVAC or infotainment.

How to Test a Fuse

Testing a fuse is a straightforward process homeowners and DIYers can do with a few simple tools:

1. Safety First: Always turn off the ignition and remove the key from the vehicle before working with fuses. This prevents accidental shorts or electrical shocks.
2. Locate the Fuse Box: Refer to your vehicle's owner's manual or the "Quick Answer" section above to find the correct fuse box.
3. Identify the Suspect Fuse: Once the fuse box lid is open, locate the fuse responsible for the malfunctioning component using the diagram printed on the lid or in your owner's manual.
4. Visual Inspection: Many fuses have a visible wire element inside. If this wire is broken or melted, the fuse is blown. However, some mini and low-profile fuses can be difficult to inspect visually.
5. Use a Fuse Puller: Most fuse boxes come with a small plastic fuse puller. Use it to carefully remove the suspect fuse. Avoid using metal tools, which could cause a short.
6. Test with a Multimeter (Recommended):
   • Set your multimeter to the "ohms" or continuity setting.
   • Touch one probe to each metal terminal on the top of the fuse. If the multimeter beeps or displays a reading close to zero ohms, the fuse is good.
   • If there is no beep or the reading shows "OL" (Open Line) or an extremely high resistance, the fuse is blown.
7. Replace with a New Fuse: If the fuse is blown, replace it with a new fuse of the exact same amperage and type. Using a fuse with a higher amperage rating can lead to serious electrical damage or fire. Only use fuses recommended by the manufacturer.

Common Blown Fuses on This Vehicle

While any fuse can blow, some circuits are more prone to issues due to their load or frequent use:

• Cigar Lighter / 12V Power Outlets (F3 Instrument Panel): These fuses often blow due to overloading from charging multiple devices or using high-power accessories. If your phone charger or air compressor stops working, check this fuse first.
• Blower Motor (F10 Instrument Panel / F10 Under-Hood for heavy-duty): A failing blower motor or an obstructed cabin air filter can cause the blower motor fuse to blow. If your HVAC fan isn't working, this is a prime suspect.
• Trailer Brake Control Module (F12 Under-Hood) / Trailer Wiring (F2 Cargo Area): Issues with trailer wiring, short circuits in the trailer itself, or overloading can cause these fuses to pop. If your trailer lights or brakes aren't working, inspect these.
• Radio / Infotainment (F1 Instrument Panel): While less common, issues with aftermarket installations or internal component failures can sometimes lead to this fuse blowing. If your radio is completely dead, check this fuse.
• Headlights (F5-F8 Under-Hood): A blown headlight fuse will typically affect one headlight beam (low or high). If one headlight isn't working, check the corresponding fuse before assuming it's the bulb.

Always remember to check the simplest solutions first, like a blown fuse, before diving into more complex diagnostics. If a fuse repeatedly blows after replacement, it indicates a deeper electrical issue that should be addressed by a qualified technician.

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