Learn about Chevrolet Silverado (GMT T1XX) 2019-2021 fuse box and relay’s locations, functions, and maintenance tips for optimal vehicle electrical system.
The Chevrolet Silverado (GMT T1XX) 2019-2021 is a full-size pickup truck available in various cab and bed configurations to meet diverse needs, from everyday work to family travel. With options including Regular Cab, Double Cab, and Crew Cab, as well as multiple bed lengths, the Silverado offers flexibility and a rugged design. Known for its powerful performance, the Silverado T1XX platform features modern technology, comfortable interiors, and robust towing capabilities.
The Silverado’s complex electrical system, which powers advanced features like driver assistance and infotainment, relies on well-organized fuse boxes and relays. The primary fuse box is located under the hood, while an additional fuse box may be found within the cabin, usually near the dashboard. Relays, which manage high-current components like the starter motor, fuel pump, and lighting, are also located near these fuse boxes. Regular inspection of these components helps maintain smooth electrical operation.
MUST READ: DYI – How to Check Car Fuses?
(2019-2021) Chevrolet Silverado (GMT T1XX) 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 (GMT T1XX) 2019-2021 fuse assignment
Chevrolet Silverado (GMT T1XX) Year of production: 2019, 2020, 2021
Instrument Panel Fuse Block (Left):
The fuse block for the left instrument panel can be accessed on the driver’s side edge of the panel. Simply remove the cover to reach the fuse block.
Instrument Panel Fuse Block (Right):
The fuse block access door on the right side of the instrument panel is located at the edge of the passenger side. To reach the front of the fuse block, simply pull off the cover.
To access the back of the fuse block:
- Push the tab at the top of fuse block down.
- Pull the top of the fuse block outward.
- Reverse Steps 1-2 to reinstall.
Engine Compartment Fuse Block:
The engine compartment fuse block is in the engine compartment, on the passenger side of the vehicle. Lift the cover to access the fuse block.
Fuse Box Diagrams
2019
Instrument Panel Fuse Block (Left)
List of fuses in the Left Instrument Panel Fuse Block (2019)
| â„– | Usage |
|---|---|
| F1 | Rear heated seats left/right |
| F3 | Euro trailer |
| F4 | – |
| F5 | Front Bolster |
| F6 | Heated and cooled seats left/right |
| F8 | Rear seat entertainment / Theft deterrent |
| F9 | Passive entry / Passive start / Driver seat module |
| F10 | – |
| F11 | Sunshade |
| F12 | Passenger power seat |
| F13 | Export power take off / Special equipment option 1 |
| F14 | – |
| F15 | – |
| F16 | AMP |
| F17 | MFEG |
| F18 | – |
| F20 | Endgate |
| F22 | Rear sliding window |
| F23 | – |
| F24 | – |
| F25 | – |
| F26 | – |
| F27 | – |
| Circuit Breakers | |
| CB1 | – |
| Relays | |
| K1 | Rear sliding window open |
| K2 | Rear sliding window close |
| K3 | MFEG major 1 |
| K4 | MFEG minor 1 |
| K5 | MFEG minor 2 |
| K6 | MFEG major 2 |
| K7 | Anti-theft |
| K8 | – |
Instrument Panel Fuse Block (Right)
List of fuses in the Right Instrument Panel Fuse Block (2019)
| â„– | Usage |
|---|---|
| F1 | Right doors |
| F2 | Left doors |
| F3 | Universal remote system |
| F4 | – |
| F5 | – |
| F6 | Front blower |
| F8 | Lumbar switch |
| F10 | Body control module 6 / Body control module 7 |
| F11 | Seat / CLM |
| F12 | Body control module 3 / Body control module 5 |
| F14 | Mirrors/Windows module |
| F17 | Steering wheel controls |
| F18 | VPM / OBS DET |
| F19 | DLIS |
| F20 | Cooled seats |
| F21 | NOT R/C |
| F22 | Heated steering wheel |
| F23 | MISC R/C |
| F24 | Instrument panel cluster ignition / Overhead |
| F25 | Heating, ventilation, and air conditioning ignition / Heating, ventilation, and air conditioning auxiliary |
| F26 | USB ports / Special equipment option retained accessory power |
| F27 | Accessory power outlet / retained accessory power |
| F28 | Accessory power outlet / Battery |
| F30 | Sensing and diagnostic module / Parking brake |
| F31 | Body control module 4 |
| F32 | Special equipment option / Data link connection |
| F33 | Body control module 8 |
| F34 | Cargo lamp |
| F40 | CGM |
| F41 | Infotainment 1 |
| F42 | TCP |
| F43 | – |
| F44 | AVM |
| F45 | Body control module 2 |
| F46 | Pleating, ventilation, and air conditioning / Battery 1 |
| F47 | Instrument panel cluster / Battery |
| F48 | Transmission control module |
| F49 | Body control module 1 |
| F50 | – |
| F51 | Battery 1 |
| F52 | Battery 2 |
| F53 | – |
| F54 | Sunroof |
| F55 | Driver power seat |
| F56 | DC DC TRANS 1 |
| F57 | DC DC TRANS 2 |
| F58 | Infotainment 2 |
| Circuit Breakers | |
| CB1 | Accessory power outlet 2 |
| CB2 | Accessory power outlet 1 / Cigarette Lighter |
| CB3 | Accessory power outlet 3 |
| CB4 | Accessory power outlet 4 |
| Relays | |
| K1 | Run/Crank |
| K2 | Retained accessory power / Accessory 1 |
| K4 | Retained accessory power / Accessory 2 |
| K5 | – |
Engine Compartment Fuse Block
List of fuses in the Engine Compartment Fuse Block (2019)
| â„– | Usage |
|---|---|
| 1 | High-beam left |
| 2 | High-beam right |
| 3 | Headlamp left |
| 4 | Headlamp right |
| 6 | TIM |
| 7 | – |
| 8 | Fog lamp |
| 9 | VKM |
| 10 | – |
| 11 | Police upfitter |
| 12 | – |
| 13 | Washer front |
| 14 | Washer rear |
| 15 | MSB driver |
| 16 | – |
| 17 | IECL 1 |
| 19 | DC/AC inverter |
| 20 | IECR2 |
| 21 | MSB pass |
| 22 | IECL 2 |
| 24 | Electric brake booster 1 |
| 25 | REC |
| 26 | – |
| 27 | Horn |
| 28 | – |
| 29 | – |
| 30 | – |
| 31 | – |
| 32 | Rear window defogger |
| 33 | Heated mirror |
| 34 | Parking lamp left |
| 37 | Euro trailer |
| 38 | TIM |
| 39 | – |
| 40 | Misc ignition |
| 41 | Trailer parking lamp |
| 42 | Park lamp right |
| 44 | – |
| 45 | Second fuel pump |
| 46 | Engine control module ignition |
| 47 | Transmission control module ignition |
| 48 | – |
| 49 | Transmission control module |
| 50 | A/C clutch |
| 51 | Transfer case control module |
| 52 | Front wiper |
| 53 | Center high-mounted stop lamp |
| 54 | Trailer reverse lamp |
| 55 | Trailer back-up lamp |
| 56 | SADS |
| 57 | TTPM |
| 58 | Starter motor |
| 60 | Active fuel management 1 |
| 61 | VES |
| 62 | Integrated chassis control module / CVS |
| 63 | Trailer battery |
| 65 | Auxiliary underhood electrical center |
| 66 | Cooling fan motor left |
| 67 | Active fuel management 2 |
| 68 | – |
| 69 | Starter pinion |
| 71 | Cooling fan |
| 72 | Cooling fan right |
| 73 | Trailer stop/turn lamp left |
| 74 | TIM |
| 75 | DEFC |
| 76 | Electric RNG BDS |
| 78 | Engine control module |
| 79 | Auxiliary battery |
| 80 | Cabin cooling pump |
| 81 | Trailer stop/turn lamp right |
| 82 | TIM |
| 83 | FTZM |
| 84 | Trailer brake |
| 85 | ENG |
| 86 | Engine control module |
| 87 | Injector B even |
| 88 | O2 B sensor |
| 89 | O2 A sensor |
| 90 | Injector A odd |
| 91 | Engine control module throttle control |
| 92 | Cool fan clutch |
| Relays | |
| 5 | Headlamp |
| 18 | DC/AC inverter |
| 23 | Rear window defogger |
| 35 | Parking lamp |
| 36 | Run/Crank |
| 43 | Second fuel pump |
| 59 | A/C clutch |
| 64 | Starter motor |
| 70 | Starter pinion |
| 77 | Powertrain |
2020
Instrument Panel Fuse Block (Left)
List of fuses in the Left Instrument Panel Fuse Block (2020)
| â„– | Usage |
|---|---|
| F1 | Rear heated seats left/right |
| F3 | Euro trailer |
| F4 | – |
| F5 | Front Bolster |
| F6 | Heated and ventilated seats left/right |
| F8 | Rear seat entertainment / Theft deterrent |
| F9 | Passive entry / Passive start / Driver seat module |
| F10 | – |
| F11 | Sunshade |
| F12 | Passenger power seat |
| F13 | Export power take off / Special equipment option 1 |
| F14 | – |
| F15 | – |
| F16 | AMP |
| F17 | MFEG |
| F18 | – |
| F20 | Endgate |
| F22 | Rear sliding window |
| F23 | – |
| F24 | – |
| F25 | – |
| F26 | – |
| F27 | – |
| Circuit Breakers | |
| CB1 | – |
| Relays | |
| K1 | Rear sliding window open |
| K2 | Rear sliding window close |
| K3 | MFEG major 1 |
| K4 | MFEG minor 1 |
| K5 | MFEG minor 2 |
| K6 | MFEG major 2 |
| K7 | Anti-theft |
| K8 | – |
Instrument Panel Fuse Block (Right)
List of fuses in the Right Instrument Panel Fuse Block (2020)
| â„– | Usage |
|---|---|
| F1 | Right doors |
| F2 | Left doors |
| F3 | Universal remote system |
| F4 | – |
| F5 | – |
| F6 | Front blower |
| F8 | Lumbar switch |
| F10 | Body control module 6 / Body control module 7 |
| F11 | Seat / CLM |
| F12 | Body control module 3 / Body control module 5 |
| F14 | Mirrors/Windows module |
| F17 | Steering wheel controls |
| F18 | VPM / OBS DET |
| F19 | DLIS |
| F20 | Ventilated seats |
| F21 | NOT R/C |
| F22 | Heated steering wheel |
| F23 | MISC R/C |
| F24 | Instrument panel cluster ignition / Overhead |
| F25 | Heating, ventilation, and air conditioning ignition / Heating, ventilation, and air conditioning auxiliary |
| F26 | USB ports / Special equipment option retained accessory power |
| F27 | Accessory power outlet / retained accessory power |
| F28 | Accessory power outlet / Battery |
| F30 | Sensing and diagnostic module / Parking brake |
| F31 | Body control module 4 |
| F32 | Special equipment option/Data link connection |
| F33 | Body control module 8 |
| F34 | Cargo lamp |
| F40 | CGM |
| F41 | Infotainment 1 |
| F42 | TCP |
| F43 | – |
| F44 | AVM |
| F45 | Body control module 2 |
| F46 | Heating, ventilation, and air conditioning / Battery 1 |
| F47 | Instrument panel cluster / Battery |
| F48 | Transmission control module |
| F49 | Body control module 1 |
| F50 | – |
| F51 | Battery 1 |
| F52 | Battery 2 |
| F53 | – |
| F54 | Sunroof |
| F55 | Driver power seat |
| F56 | DC DC TRANS 1 |
| F57 | DC DC TRANS 2 |
| F58 | Infotainment 2 |
| Circuit Breakers | |
| CB1 | Accessory power outlet 2 |
| CB2 | Accessory power outlet 1 / Cigarette Lighter |
| CB3 | Accessory power outlet 3 |
| CB4 | Accessory power outlet 4 |
| Relays | |
| K1 | Run/Crank |
| K2 | Retained accessory power / Accessory 1 |
| K4 | Retained accessory power / Accessory 2 |
| K5 | – |
Engine Compartment Fuse Block
List of fuses in the Engine Compartment Fuse Block (2020)
| â„– | Usage |
|---|---|
| 1 | High-beam left |
| 2 | High-beam right |
| 3 | Headlamp left |
| 4 | Headlamp right |
| 6 | TIM |
| 7 | – |
| 8 | Fog lamp |
| 9 | VKM |
| 10 | – |
| 11 | Police upfitter |
| 12 | – |
| 13 | Washer front |
| 14 | Washer rear |
| 15 | MSB driver |
| 16 | – |
| 17 | IECL 1 |
| 19 | DC/AC inverter |
| 20 | IECR2 (LD) / EBCM2 (HD) |
| 21 | MSB pass |
| 22 | IECL 2 |
| 24 | EBCM 1 |
| 25 | REC |
| 26 | – |
| 27 | Horn |
| 28 | – |
| 29 | – |
| 30 | – |
| 31 | – |
| 32 | Rear window defogger |
| 33 | Heated mirror |
| 34 | Parking lamp left |
| 37 | Euro trailer |
| 38 | TIM |
| 39 | – |
| 40 | Misc ignition |
| 41 | Trailer parking lamp |
| 42 | Park lamp right |
| 44 | – |
| 45 | Second fuel pump |
| 46 | Engine control module ignition |
| 47 | Transmission control module ignition |
| 48 | – |
| 49 | Transmission control module |
| 50 | A/C clutch |
| 51 | Transfer case control module |
| 52 | Front wiper |
| 53 | Center high-mounted stop lamp |
| 54 | Trailer reverse lamp |
| 55 | Trailer back-up lamp |
| 56 | SADS |
| 57 | TTPM |
| 58 | Starter motor (LD & HD DSL) |
| 60 | Active fuel management 1 |
| 61 | VES |
| 62 | Integrated chassis control module / CVS |
| 63 | Trailer battery |
| 65 | Auxiliary underhood electrical center |
| 66 | Cooling fan motor left |
| 67 | Active fuel management 2 |
| 68 | – |
| 69 | Starter Pinion (LD) / Starter Motor (HD Gas) |
| 71 | Cooling fan |
| 72 | Cooling fan right |
| 73 | Trailer stop/turn lamp left |
| 74 | TIM |
| 75 | DEFC |
| 76 | Electric RNG BDS |
| 78 | Engine control module |
| 79 | Auxiliary battery |
| 80 | Cabin cooling pump |
| 81 | Trailer stop/turn lamp right |
| 82 | TIM |
| 83 | FTZM |
| 84 | Trailer brake |
| 85 | ENG |
| 86 | Engine control module |
| 87 | Injector B even |
| 88 | O2 B sensor |
| 89 | O2 A sensor |
| 90 | Injector A odd |
| 91 | Engine control module throttle control |
| 92 | Cool fan clutch |
| Relays | |
| 5 | Headlamp |
| 18 | DC/AC inverter |
| 23 | Rear window defogger |
| 35 | Parking lamp |
| 36 | Run/Crank |
| 43 | Second fuel pump |
| 59 | A/C clutch |
| 64 | Starter Motor (LD & HD DSL) / Cool Fan Clutch (HD Gas) |
| 70 | Starter Pinion (LD) / Starter Motor (HD Gas) |
| 77 | Powertrain |
2021
Instrument Panel Fuse Block (Left)
List of fuses in the Left Instrument Panel Fuse Block (2021)
| â„– | Usage |
|---|---|
| F1 | Rear heated seats left/right |
| F3 | – |
| F4 | – |
| F5 | Spare / MFEG |
| F6 | Heated and ventilated seats left/right |
| F8 | – |
| F9 | Passive entry passive start / Spare |
| F10 | – |
| F11 | – |
| F12 | Passenger power seat |
| F13 | Export power take off / Special equipment option 1 |
| F14 | – |
| F15 | – |
| F16 | AMP |
| F17 | – |
| F18 | – |
| F20 | Endgate |
| F22 | Rear sliding window |
| F23 | – |
| F24 | – |
| F25 | – |
| F26 | – |
| F27 | – |
| Circuit Breakers | |
| CB1 | – |
| Relays | |
| K1 | Rear sliding window open |
| K2 | Rear sliding window close |
| K3 | MFEG major 1 |
| K4 | MFEG minor 1 |
| K5 | MFEG minor 2 |
| K6 | MFEG major 2 |
| K7 | – |
| K8 | – |
Instrument Panel Fuse Block (Right)
List of fuses in the Right Instrument Panel Fuse Block (2021)
| â„– | Usage |
|---|---|
| F1 | Right doors |
| F2 | Left doors |
| F3 | Universal garage door opener |
| F4 | – |
| F5 | – |
| F6 | Front blower |
| F8 | Lumbar switch |
| F10 | Body control module 6 / Body control module 7 |
| F11 | Seat/Column lock module |
| F12 | Body control module 3 / Body control module 5 |
| F14 | Mirrors/Windows module |
| F17 | Steering wheel controls |
| F18 | Video processing module / Obstacle detection |
| F19 | DUS |
| F20 | Ventilated seats |
| F21 | NOT R/C |
| F22 | Heated steering wheel |
| F23 | MISC R/C |
| F24 | Instrument panel cluster ignition / Overhead |
| F25 | Heating, ventilation, and air conditioning ignition/ Heating, ventilation, and air conditioning auxiliary |
| F26 | USB ports / Special equipment option retained accessory power |
| F27 | Accessory power outlet / retained accessory power |
| F28 | Accessory power outlet / Battery |
| F30 | Sensing and diagnostic module / Parking brake |
| F31 | Body control module 4 |
| F32 | Special equipment option / Data link connection |
| F33 | Body control module 8 |
| F34 | Cargo lamp |
| F40 | CGM |
| F41 | Infotainment 1 |
| F42 | TCP |
| F43 | – |
| F44 | Active vibration management |
| F45 | Body control module 2 |
| F46 | Heating, ventilation, and air conditioning / Battery 1 |
| F47 | Instrument panel duster / Battery |
| F48 | Transmission control module |
| F49 | Body control module 1 |
| F50 | – |
| F51 | Battery 1 |
| F52 | Battery 2 |
| F53 | – |
| F54 | Sunroof |
| F55 | Driver power seat |
| F56 | DC DC TRANS 1 |
| F57 | DC DC TRANS 2 |
| F58 | Infotainment 2 |
| Circuit Breakers | |
| CB1 | Accessory power outlet 2 |
| CB2 | Accessory power outlet 1 / Cigarette Lighter |
| CB3 | Accessory power outlet 3 |
| CB4 | Accessory power outlet 4 |
| Relays | |
| K1 | Run/Crank |
| K2 | Retained accessory power / Accessory 1 |
| K4 | Retained accessory power / Accessory 2 |
| K5 | – |
Engine Compartment Fuse Block
List of fuses in the Engine Compartment Fuse Block (2021)
| â„– | Usage |
|---|---|
| 1 | High-beam left |
| 2 | High-beam right |
| 3 | Headlamp left |
| 4 | Headlamp right |
| 6 | – |
| 7 | – |
| 8 | Fog lamp |
| 9 | – |
| 10 | – |
| 11 | Police upfitter |
| 12 | – |
| 13 | Washer front |
| 14 | Washer rear |
| 15 | – |
| 16 | – |
| 17 | IECL1 |
| 19 | DC/AC inverter |
| 20 | IECR 2 (LD) / EBCM2 (HD) |
| 21 | – |
| 22 | IECL2 |
| 24 | EBCM 1 |
| 25 | – |
| 26 | – |
| 27 | Horn |
| 28 | – |
| 29 | – |
| 30 | – |
| 31 | – |
| 32 | Rear window defogger |
| 33 | Heated mirror |
| 34 | Parking lamp left |
| 37 | – |
| 38 | – |
| 39 | – |
| 40 | Misc ignition |
| 41 | Trailer parking lamp |
| 42 | Park lamp right |
| 44 | – |
| 45 | – |
| 46 | Engine control module ignition |
| 47 | Transmission control module ignition |
| 48 | – |
| 49 | Transmission control module |
| 50 | A/C clutch |
| 51 | Transfer case control module |
| 52 | Front wiper |
| 53 | Center high-mounted stop lamp |
| 54 | Trailer reverse lamp |
| 55 | Trailer back-up lamp |
| 56 | SADS |
| 57 | TTPM / SBZA |
| 58 | Starter motor (LD & HD DSL) |
| 60 | Active fuel management 1 |
| 61 | VES |
| 62 | Integrated chassis control module / CVS |
| 63 | Trailer battery |
| 65 | Auxiliary underhood electrical center |
| 66 | Cooling fan motor left |
| 67 | Active fuel management 2 |
| 68 | – |
| 69 | Starter Pinion (LD) / Starter Motor (HD Gas) |
| 71 | Cooling fan |
| 72 | Cooling fan right / Lower |
| 73 | Trailer stop/turn lamp left |
| 74 | Trailer Interface Module 1 |
| 75 | DEFC |
| 76 | Electric RNG BDS |
| 78 | Engine control module |
| 79 | Auxiliary battery |
| 80 | Cabin cooling pump |
| 81 | Trailer stop/turn lamp right |
| 82 | Trailer Interface Module 2 |
| 83 | FTZM |
| 84 | Trailer brake |
| 85 | ENG |
| 86 | Engine control module |
| 87 | Injector B even |
| 88 | O2 B sensor |
| 89 | O2 A sensor |
| 90 | Injector A odd |
| 91 | Engine control module throttle control |
| 92 | Cool fan clutch / Aeroshutter |
| Relays | |
| 5 | Headlamp |
| 18 | DC/AC inverter |
| 23 | Rear window defogger |
| 35 | Parking lamp |
| 36 | Run/Crank |
| 43 | – |
| 59 | A/C clutch |
| 64 | Starter Motor (LD & HD DSL) |
| 70 | Starter Pinion (LD) / Starter Motor (HD Gas) |
| 77 | Powertrain |
Conclusion
The Chevrolet Silverado 2019-2021 blends functionality with modern amenities, supported by a reliable electrical system. Proper maintenance of fuse boxes and relays ensures consistent performance.
