The Chevrolet Silverado Mk3 (3rd Generation), produced from 2014 to 2018, is a full-size pickup truck renowned for its durability, towing capacity, and advanced features. A key aspect of maintaining its reliability lies in the proper functioning of its electrical system, which is safeguarded by fuse boxes and relays.
The fuse box in the Silverado Mk3 is located in two primary areas: one in the engine compartment and another inside the cabin. The engine compartment fuse box handles critical circuits related to the engine, transmission, and high-power components, while the interior fuse box manages lower-power systems such as the infotainment, lighting, and power windows. Fuses protect each circuit by blowing out in case of a short circuit or overload, thereby preventing further electrical damage.
Relays in the Silverado act as switches for high-current devices, such as the starter motor, fuel pump, and cooling fans. These relays ensure that high-power components can be controlled by low-power circuits safely. Regular inspection and maintenance of fuses and relays are crucial to preventing electrical issues and ensuring the truck’s systems function reliably, from the engine to interior comfort features.
MUST READ: DYI – How to Check Car Fuses?
(2014-2018) Chevrolet Silverado mk3 (3rd Gen) fuse box and relay with Diagram
WARNING
- Never replace a fuse with one that has a higher amperage rating.
- A fuse with a too-high amperage could damage the electrical part and cause a fire.
- On no account should fuses be repaired (e.g. patched up with tin foil or wire) as this may cause serious damage elsewhere in the electrical circuit or cause a fire.
- If a fuse blows repeatedly, do not keep replacing it. Instead, have the cause for the repeated short circuit or overload tracked and fixed.
- Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
Chevrolet Silverado mk3 (3rd Gen) 2014-2018 fuse assignment
- Cigar lighter / power outlet fuses in the Chevrolet Silverado are the fuses №. 1, 10, 11, 12 in the Driver’s Side Instrument panel fuse box and fuses №. 1, 2 in the Passenger’s Side Instrument panel fuse box.
Year of production: from 2014, 2015, 2016, 2017, 2018
Fuse box location
Instrument Panel Fuse Box №. 1 (Driver’s Side)
It is located on the side of the instrument panel, on the driver’s side, behind the cover.
Instrument Panel Fuse Box №. 2 (Passenger Side)
It is located on the side of the instrument panel, on the passenger side, behind the cover.
Engine Compartment Fuse Box
It is located in the engine compartment on the driver’s side.
Fuse box diagrams
2014, 2015, 2016
Instrument Panel Fuse Box №1 (Driver’s Side)
Assignment of the fuses in the Instrument Panel Fuse Box №1 (2014-2016)
| № | Usage |
|---|---|
| 1 | Accessory Power Outlet 2 |
| 2 | SEO /Retained Accessory Power |
| 3 | Universal garage door opener/Interior rearview mirror |
| 6 | Body Control Module 3 |
| 7 | Body Control Module 5 |
| 8 | Driver Window Switch/Mirror Switch |
| 9 | — |
| 10 | Accessory power outlet/Retained accessory power |
| 11 | Accessory Power Outlet Battery |
| 12 | Accessory Power Outlet 1/Cigarette Lighter |
| 13 | Discrete Logic Ignition Switch |
| 14 | Switch Backlighting |
| 17 | Body Control Module 1 |
| 19 | — |
| 20 | — |
| 22 | HVAC/Auxiliary HVAC/Ignition |
| 23 | Instrument cluster/ Ignition sensing diagnostic module/ Ignition |
| 24 | — |
| 25 | Data Link Connector/ Driver Seat Module |
| 26 | Passive entry/Passive start/HVAC |
| 27 | — |
| 28 | — |
| 29 | Park enable/ Electrically adjustable pedals |
| 30 | SEO |
| 31 | Accessory/Run/Crank |
| 32 | Heated Steering Wheel |
| 33 | — |
| 34 | Instrument Cluster |
| 36 | — |
| 37 | — |
| 40 | Left Doors |
| 41 | Driver Power Seat |
| 43 | Left heated, cooled or ventilated seats (if equipped) |
| 44 | Right heated, cooled or ventilated seats (if equipped |
| 45 | — |
| 49 | Retained Accessory Power/Accessory |
| 50 | Run/Crank |
Instrument Panel Fuse Box №2 (Passenger’s Side)
Assignment of the fuses in the Instrument Panel Fuse Box №2 (2014-2016)
| № | Usage |
|---|---|
| 1 | Accessory Power Outlet 3 |
| 2 | Accessory Power Outlet 4 |
| 7 | Body Control Module 4 |
| 8 | Body Control Module 8 |
| 9 | Rear Seat Entertainment |
| 10 | Cargo Lamp |
| 15 | Steering Wheel Controls |
| 18 | Radio |
| 19 | — |
| 20 | Sunroof |
| 23 | Airbag/Info |
| 26 | Export/Power Take Off/SEO Battery 1 |
| 27 | Obstacle Detection/ USB Ports |
| 28 | Body Control Module 2 |
| 32 | SEO Battery 2 |
| 35 | AC Inverter |
| 36 | Amplifier |
| 37 | — |
| 39 | Rear Sliding Window |
| 42 | Right Door Window Motor |
| 43 | Front Blower |
| 44 | SEO |
| 45 | Body Control Module 6 |
| 46 | Body Control Module 7 |
| 47 | Passenger Seat |
| 50 | Retained Accessory Power/Accessory |
| 51 | Rear Sliding Window Open |
| 52 | Rear Sliding Window Close |
Engine Compartment
Assignment of the fuses and relays in the Engine Compartment (2014, 2015, 2016)
| № | Usage |
|---|---|
| 1 | Trailer Brake |
| 2 | Trailer Battery |
| 3 | Antilock Brake System Pump |
| 4 | Instrument Panel BEC 1 |
| 5 | Spare |
| 6 | 4WD Tree |
| 7 | Spare |
| 8 | Instrument Panel BEC 2 |
| 9 | Spare |
| 10 | Rear Window Defogger |
| 11 | Starter |
| 12 | Cooling Fan 1 |
| 13 | Cooling Fan 2 |
| 14 | Trailer Stop/Turn Lamps, Left |
| 15 | Trailer Parking Lamps |
| 16 | Trailer Back-up Lamp |
| 17 | Trailer Stop/Turn Lamps, Right |
| 18 | Fuel Pump |
| 19 | Integrated Chassis Control Module |
| 20 | Electronic Suspension Control Module |
| 21 | Fuel Pump Power Module |
| 22 | Upfitter Switch 1 |
| 23 | Upfitter 2 |
| 24 | Front Wiper |
| 25 | Antilock Brake System Valves |
| 26 | Upfitter SW 2 |
| 27 | Upfitter SW 3 |
| 28 | Parking Lamps, Right |
| 29 | Parking Lamps, Left |
| 30 | Upfitter 3 |
| 31 | Upfitter SW 4 |
| 32 | Upfitter 4 |
| 33 | Back-up Lamps |
| 34 | Engine Control Module Ignition |
| 35 | Air Conditioning Compressor Clutch |
| 36 | Heated Mirrors |
| 37 | Upfitter 1 |
| 38 | Center High-Mounted Stoplamp |
| 39 | Miscellaneous Ignition |
| 40 | Transmission Ignition |
| 41 | Fuel Pump 2 |
| 42 | Cooling Fan Clutch |
| 43 | Engine |
| 44 | Fuel Injectors A, Odd |
| 45 | Fuel Injectors B, Even |
| 46 | Oxygen Sensor B |
| 47 | Throttle Control |
| 48 | Horn |
| 49 | Fog Lamp |
| 50 | Oxygen Sensor A |
| 51 | Engine Control Module |
| 52 | Interior Heater |
| 53 | Spare |
| 54 | Aeroshutter |
| 55 | Front Washer |
| 56 | Air Conditioning Compressor/ Battery Regulated Voltage Control |
| 57 | Air Conditioning Compressor Module/ Battery Pack |
| 58 | Transmission Control Module/ Engine Control Module |
| 59 | Headlamps |
| Relays | |
| 60 | Fuel Pump |
| 61 | Upfitter 2 |
| 62 | Upfitter 3 |
| 63 | Upfitter 4 |
| 64 | Trailer Parking Lamps |
| 65 | Run/Crank |
| 66 | Upfitter 1 |
| 67 | Fuel Pump 2 |
| 68 | Air Conditioning Control |
| 69 | Starter |
| 70 | Rear Window Defogger |
| 71 | Engine Control Module |
| 72 | Cooling Fan Clutch |
2017, 2018
Instrument Panel Fuse Box №1 (Driver’s Side)
Assignment of the fuses in the Instrument Panel Fuse Box №1 (2017, 2018)
| № | Usage |
|---|---|
| 1 | Accessory power outlet 2 |
| 2 | Special equipment option/Retained accessory power |
| 3 | Universal remote system/lnterior rearview mirror |
| 6 | Body control module 3 |
| 7 | Body control module 5 |
| 8 | Driver window switch/ Mirror switch |
| 9 | Not Used |
| 10 | Accessory power outlet/Retained accessory power |
| 11 | Accessory power outlet battery |
| 12 | Accessory power outlet 1/Cigarette lighter |
| 13 | Discrete logic ignition switch |
| 14 | Switch backlighting |
| 17 | Body control module 1 |
| 19 | — |
| 20 | — |
| 22 | Heating, ventilation, and air conditioning/ Auxiliary heating, ventilation, and air conditioning/lgnition |
| 23 | Instrument cluster/ Ignition sensing diagnostic module/ Ignition |
| 24 | Not Used |
| 25 | Data link connector/ Driver seat module |
| 26 | Passive entry/Passive start/Heating, ventilation, and air conditioning |
| 27 | Not Used |
| 28 | Not Used |
| 29 | Park enable/ Electrically adjustable pedals |
| 30 | Special equipment option |
| 31 | Accessory/Run/Crank |
| 32 | Heated steering wheel |
| 33 | Not Used |
| 34 | Instrument cluster |
| 36 | Not Used |
| 37 | Not Used |
| 38 | 4WD transfer case electronic control |
| 40 | Left doors |
| 41 | Driver power seat |
| 43 | Left heated, cooled or ventilated seats (if equipped) |
| 44 | Right heated, cooled or ventilated seats (if equipped) |
| 45 | — |
| Relays | |
| 49 | Retained accessory power |
| 50 | Run/Crank |
Instrument Panel Fuse Box №2 (Passenger’s Side)
Assignment of the fuses in the Instrument Panel Fuse Box №2 (2017, 2018)
| № | Usage |
|---|---|
| 1 | Accessory power outlet 3 |
| 2 | Accessory power outlet 4 |
| 7 | Body control module 4 |
| 8 | Body control module 8 |
| 9 | Rear seat entertainment |
| 10 | Cargo lamp |
| 15 | Steering wheel controls |
| 18 | Radio |
| 19 | Not Used |
| 20 | Sunroof |
| 23 | Airbag/Info |
| 26 | Export/Power take off/ Special equipment option/Battery 1 |
| 27 | Obstacle detection/ USB ports |
| 28 | Body control module 2 |
| 32 | Special equipment option/Battery 2 |
| 35 | Air conditioning inverter |
| 36 | Amplifier |
| 37 | Battery system |
| 39 | Rear sliding window |
| 42 | Right door window motor |
| 43 | Front blower |
| 44 | Special equipment option |
| 45 | Body control module 6 |
| 46 | Body control module 7 |
| 47 | Passenger seat |
| Relays | |
| 50 | Retained accessory power |
| 51 | Rear sliding window open |
| 52 | Rear sliding window close |
Engine Compartment
Assignment of the fuses and relays in the Engine Compartment (2017, 2018)
| № | Usage |
|---|---|
| 1 | Trailer brake |
| 2 | Trailer battery |
| 3 | Antilock brake system pump |
| 4 | Instrument panel BEC 1 |
| 5 | Passenger motorized seat belt |
| 6 | 4WD transfer case electronic control |
| 7 | Electric park brake |
| 8 | Instrument panel BEC 2 |
| 9 | Driver motorized seat belt |
| 10 | Rear window defogger |
| 11 | Starter |
| 12 | Cooling fan 1 |
| 13 | Cooling fan 2 |
| 14 | Left trailer stop/ Turn signal lamps |
| 15 | Trailer parking lamps |
| 16 | Trailer reverse lamps |
| 17 | Right trailer stop/ Turn signal lamps |
| 18 | Fuel pump |
| 19 | Integrated chassis control module |
| 20 | Electronic suspension control module |
| 21 | Fuel pump power module |
| 22 | Upfitter 1 |
| 23 | Upfitter 2 |
| 24 | Front wiper |
| 25 | Antilock brake system valve |
| 26 | Upfitter 2 |
| 27 | Upfitter 3 |
| 28 | Right parking lamps |
| 29 | Left parking lamps |
| 30 | Upfitter 3 |
| 31 | Upfitter 4 |
| 32 | Upfitter 4 |
| 33 | Reverse lamps |
| 34 | Engine control module/Ignition |
| 35 | Air conditioning clutch |
| 36 | Heated mirrors |
| 37 | Upfitter 1 |
| 38 | Center high-mounted stoplamp |
| 39 | Miscellaneous/ Ignition |
| 40 | Transmission/ Ignition |
| 41 | Fuel pump 2 |
| 42 | Cooling fan clutch |
| 43 | Engine |
| 44 | Fuel injectors A–odd |
| 45 | Fuel injectors B–even |
| 46 | O2 Sensor B |
| 47 | Throttle control |
| 48 | Horn |
| 49 | Fog lamps |
| 50 | O2 Sensor A |
| 51 | Engine control module |
| 52 | Interior heater |
| 53 | Accessory power module/TPM pump |
| 54 | Front washer |
| 55 | Air conditioning/ Battery regulated voltage control |
| 56 | Air conditioning module/ Battery pack |
| 57 | Transmission control module/ Engine control module |
| 58 | Headlamps |
| 74 | Electric running boards (if equipped) |
| 76 | Fuel pump prime / MGU motor |
| 77 | Cabin pump motor |
| 79 | Vacuum pump |
| Relays | |
| 59 | Fuel pump |
| 60 | Upfitter 2 |
| 61 | Upfitter 3 |
| 62 | Upfitter 4 |
| 63 | Trailer parking lamps |
| 64 | Run/Crank |
| 65 | Upfitter 1 |
| 66 | Fuel pump 2 |
| 67 | Air conditioning control |
| 68 | Starter |
| 69 | Rear window defogger |
| 70 | Engine control module |
| 71 | Vacuum pump/ Cooling fan clutch |
| 72 | CKT 95 |
| 73 | CKT 92 |
| 75 | Fuel pump prime/ MGU motor |
| 78 | Vacuum pump switch |
Conclusion
For owners and enthusiasts of classic Chevrolet Silverado mk3 (3rd Gen) 2014-2018, understanding the fuse box and relay systems is essential for vehicle maintenance. Regular inspection and maintenance of these components helped ensure the vehicle’s longevity and reliability, preserving its status as a symbol of Chevrolet’s craftsmanship and innovation in the automotive industry during that era.
