2017 GMC Sierra 1500 Fuse Box Diagram & Amperage

Quick Answer

The 2017 GMC Sierra 1500 typically has three main fuse box locations: one under the hood, a secondary one inside the cabin on the passenger side kick panel, and a third located in the rear under the seat for specific accessories.

Under-Hood Fuse Block

This fuse box is the primary power distribution center and 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 major electrical systems.

To access it, ensure the vehicle is off and open the hood. Locate the black plastic box with a fuse symbol on the lid. Carefully unclip the cover to reveal the fuses and relays. Always refer to the fuse diagram printed on the inside of the lid for the most accurate information for your specific trim level.

Relay Locations (Under-Hood):

The under-hood fuse box also houses several important relays. While their exact position can vary slightly, common relays include:

• RUN/CRANK Relay: Controls power to the engine for starting and running.
• Fuel Pump Relay: Activates the fuel pump.
• ECM/PCM Relay: Powers the engine control module.
• Headlamp Relays: Control high and low beam headlights.
• A/C Clutch Relay: Engages the A/C compressor.
• Cooling Fan Relays: Control the engine cooling fans.
• Starter Relay: Engages the starter motor.

Instrument Panel Fuse Block (Passenger Side Kick Panel)

This fuse block is located inside the cabin, usually behind a panel on the passenger side kick panel or end of the dashboard. It typically houses fuses for interior accessories, radio, power windows, and other cabin electronics.

To access it, you may need to gently pry off a trim panel or open a small access door. Always consult your owner's manual for precise instructions and verify with the diagram on the cover.

Rear Under-Seat Fuse Block

Some 2017 GMC Sierra 1500 models may have an additional fuse block located under the rear seat for certain accessories, particularly those related to the rear of the vehicle or specific trim packages. This can include features like the rear infotainment system, power outlets, or specific towing-related electrical components. Consult your owner's manual for its exact location and diagram.

How to Test a Fuse

1. Safety First: Ensure the vehicle is turned off and the key is removed from the ignition. If working under the hood, disconnect the negative battery terminal for added safety.
2. Locate the Blown Fuse: Visually inspect the metal filament inside the clear plastic body of the fuse. A blown fuse will have a broken or melted filament. For opaque fuses, you'll need to use a multimeter or fuse tester.
3. Using a Multimeter: Set your multimeter to the continuity or ohms setting. Touch one probe to each metal blade of the fuse. A good fuse will show a reading close to zero ohms or continuity (the multimeter will beep if it has an audible continuity function). A blown fuse will show an open circuit or no continuity.
4. Using a Fuse Tester: These simple tools light up when a fuse is good. Insert the fuse into the tester, and if the light illuminates, the fuse is good.
5. Replace with Correct Fuse: 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 electrical system damage or fire.

Common Blown Fuses on This Vehicle

While any fuse can blow, some are more common than others due to the nature of the components they protect or the load they carry. If you're experiencing an electrical issue, start by checking these common culprits:

• Cigar Lighter / 12V Outlets (20A Yellow): These frequently blow due to overcurrent from charging devices or using high-power accessories. If your phone charger or air compressor isn't working, check these first.
• Blower Motor (30A Green - Under-Hood): Issues with the HVAC fan not working often point to this fuse. A failing blower motor can draw too much current and cause this fuse to blow.
• Radio / Infotainment (10A Red - Instrument Panel): If your radio or touchscreen isn't powering on, this fuse is a good place to start. Issues with aftermarket installations or electrical shorts can sometimes cause this fuse to blow.
• Trailer Brake Controller (20A/25A Yellow/Clear - Under-Hood/Rear): If you're having trouble with your trailer brakes, check the dedicated fuses for the trailer brake controller, especially if you recently connected a new trailer or have a short in the trailer wiring.
• ECM/PCM (15A Blue - Under-Hood): While less common, a blown ECM fuse can lead to a no-start condition or various engine performance problems. If your truck won't start or runs rough, and other simple checks are clear, verify this fuse.

Always remember to check the circuit diagram in your owner's manual or on the fuse box lid, as fuse layouts and amperages can vary slightly depending on the specific trim level and options of your 2017 GMC Sierra 1500.

Find a trusted shop on Repairius.