2015 GMC Sierra 1500 Fuse Box Diagram & Amperage

Quick Answer

The 2015 GMC Sierra 1500 features multiple fuse box locations to protect its electrical systems. You'll find fuse boxes under the hood, inside the cabin on the passenger side kick panel, and in the cargo area/trunk.

Under-Hood Fuse Box

The under-hood fuse box is located in the engine compartment, typically on the driver's side, near the battery. It houses fuses and relays for critical engine components, lighting, and other high-current systems. Always consult the diagram on the fuse box lid for the most accurate information for your specific trim level.

Relay Locations (Under-Hood):

• Fuel Pump Relay: Typically located near the fuel pump fuse, controlling power to the fuel pump.
• Starter Relay: Energizes the starter solenoid when the ignition is turned to "start."
• Headlight Relays: Separate relays often control the low and high beams.
• HVAC Blower Relay: Controls the high-current circuit for the blower motor.
• A/C Clutch Relay: Engages the A/C compressor clutch.

Instrument Panel (Dash) Fuse Box

The instrument panel fuse box is located on the passenger side of the dashboard, behind the kick panel. This fuse box typically controls interior accessories, infotainment, power windows, and other cabin electrical features. Access requires removing the kick panel cover.

Cargo Area/Trunk Fuse Box

For the 2015 GMC Sierra 1500, a third fuse box is often located in the cargo area, typically on the passenger side, behind a trim panel. This fuse box commonly handles circuits for rear lighting, trailer hookups, and other cargo-related accessories.

How to Test a Fuse

Testing a fuse is a straightforward process and can help you quickly diagnose an electrical issue. Here's how:

1. Locate the Fuse Box: Identify the correct fuse box for the circuit you're troubleshooting.
2. Identify the Suspect Fuse: Refer to the fuse box diagram on the lid or in your owner's manual to pinpoint the fuse for the malfunctioning component.
3. Visual Inspection: Pull the fuse out using a fuse puller (usually found in the fuse box) or small needle-nose pliers. Hold it up to the light. If the metal wire or filament inside is broken or burnt, the fuse is blown and needs replacement.
4. Using a Multimeter (for a more precise test):
   • Set your multimeter to the continuity or ohms setting.
   • Touch one probe to each metal terminal on top of the fuse.
   • If the fuse is good, the multimeter will show a reading close to zero ohms (continuity) or beep if it has an audible continuity feature. If it shows "OL" (open loop) or no reading, the fuse is blown.
5. Replace with Correct Amperage: Always replace a blown fuse with a new fuse of the exact same amperage rating and type. Using a fuse with a higher amperage can lead to serious electrical damage or fire.

Common Blown Fuses on This Vehicle

While any fuse can blow, some circuits on the 2015 GMC Sierra 1500 tend to experience blown fuses more frequently due to their usage or the components they protect. When troubleshooting, consider checking these first:

• Cigar Lighter/12V Power Outlets (Instrument Panel Fuse Box): These fuses (e.g., F2, F3) are common culprits, often blowing due to overloads from charging multiple devices or using high-power accessories. Check for faulty charging cables or accessories.
• Trailer Brake Controller (Cargo Area Fuse Box or Under-Hood): If you experience issues with your trailer brakes, begin by examining the main power fuse for the trailer brake controller (e.g., F5) and the individual trailer light fuses (e.g., F1-F4). Wiring for trailers can sometimes short out.
• Headlights/Tail Lights (Under-Hood and/or Cargo Area Fuse Boxes): If one or a set of lights goes out, check the corresponding fuses (e.g., F7-F11). While less common, a faulty bulb or wiring issue could cause a fuse to blow.
• Blower Motor (Under-Hood Fuse Box): If your HVAC fan stops working entirely, the blower motor fuse (F13, F19) is a good place to start. A failing blower motor or an obstruction in the fan can draw excessive current and blow the fuse.
• Radio/Infotainment (Instrument Panel Fuse Box): If your radio or infotainment system suddenly goes dead, check the relevant fuse (e.g., F1). This could be due to a short in an accessory plugged into a USB port or an internal fault in the unit.

Remember to always verify the specific fuse layout for your vehicle by checking the diagram on the fuse box cover and in your owner's manual, as variations can exist even within the same model year due to different trim levels and options.

Find a trusted shop on Repairius.