Chevrolet Silverado 3500 HD 2021 Fuse Box Info
Passenger compartment fuse box location:
The left instrument panel fuse box is located on the driver side edge of the instrument panel.
The right instrument panel fuse box is located on the passenger side edge of the instrument panel.
Engine compartment fuse box:
Fuse Box Diagram | Layout
Passenger compartment fuse box (Left):
| Fuse/Relay N° | Functions |
| 1 | Rear heated seats left/right |
| 3 | - |
| 4 | - |
| 5 | Spare/MFEG |
| 6 | Heated and ventilated seats left/right |
| 8 | - |
| 9 | Passive entry passive start/ Spare |
| 10 | - |
| 11 | - |
| 12 | Passenger power seat |
| 13 | Export power take off/ Special equipment option 1 |
| 14 | - |
| 15 | - |
| 16 | AMP |
| 17 | - |
| 18 | - |
| 20 | Endgate |
| 22 | Rear sliding window |
| 23 | - |
| 24 | - |
| 25 | - |
| 26 | - |
| 27 | - |
| CB1 | - |
| 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 | - |
Passenger compartment fuse box (Right):
| Fuse/Relay N° | Functions |
| Fuses | |
| 1 | Right doors |
| 2 | Left doors |
| 3 | Universal garage door opener |
| 4 | - |
| 5 | - |
| 6 | Front blower |
| 8 | Lumbar switch |
| 10 | Body control module 6/Body control module 7 |
| 11 | Seat/Column lock module |
| 12 | Body control module 3/Body control module 5 |
| 14 | Mirrors/Windows module |
| 17 | Steering wheel controls |
| 18 | Video processing module/ Obstacle detection |
| 19 | DLIS |
| 20 | Ventilated seats |
| 21 | NOT R/C |
| 22 | Heated steering wheel |
| 23 | MISC R/C |
| 24 | Instrument panel cluster ignition/ Overhead |
| 25 | Heating, ventilation, and air conditioning ignition/ Heating, ventilation, and air conditioning auxiliary |
| 26 | USB ports/Special equipment option retained accessory power |
| 27 | Accessory power outlet/retained accessory power |
| 28 | Accessory power outlet/Battery |
| 30 | Sensing and diagnostic module/ Parking brake |
| 31 | Body control module 4 |
| 32 | Special equipment option/Data link connection |
| 33 | Body control module 8 |
| 34 | Cargo lamp |
| 40 | CGM |
| 41 | Infotainment 1 |
| 42 | TCP |
| 43 | - |
| 44 | Active vibration management |
| 45 | Body control module 2 |
| 46 | Heating, ventilation, and air conditioning/ Battery 1 |
| 47 | Instrument panel cluster/Battery |
| 48 | Transmission control module |
| 49 | Body control module 1 |
| 50 | - |
| 51 | Battery 1 |
| 52 | Battery 2 |
| 53 | - |
| 54 | Sunroof |
| 55 | Driver power seat |
| 56 | DC DC TRANS 1 |
| 57 | DC DC TRANS 2 |
| 58 | Infotainment 2 |
| Circuit Breakers | |
| 1 | Accessory power outlet 2 |
| 2 | Accessory power outlet 1/Cigarette Lighter |
| 3 | Accessory power outlet 3 |
| 4 | Accessory power outlet 4 |
| Relays | |
| K1 | Run/Crank |
| K2 | Retained accessory power/Accessory 1 |
| K4 | Retained accessory power/Accessory 2 |
| K5 | - |
Engine compartment fuse box:
| Fuse/Relay N° | Functions |
| 1 | High-beam left |
| 2 | High-beam right |
| 3 | Headlamp left |
| 4 | Headlamp right |
| 5 | Headlamp |
| 6 | - |
| 7 | - |
| 8 | Fog lamp |
| 9 | - |
| 10 | - |
| 11 | Police upfitter |
| 12 | - |
| 13 | Washer front |
| 14 | Washer rear |
| 15 | - |
| 16 | - |
| 17 | IECL 1 |
| 18 | DC/AC inverter |
| 19 | DC/AC inverter |
| 20 | IECR 2 (LD) / EBCM2 (HD) |
| 21 | - |
| 22 | IECL 2 |
| 23 | Rear window defogger |
| 24 | EBCM 1 |
| 25 | - |
| 26 | - |
| 27 | Horn |
| 28 | - |
| 29 | - |
| 30 | - |
| 31 | - |
| 32 | Rear window defogger |
| 33 | Heated mirror |
| 34 | Parking lamp left |
| 35 | Parking lamp |
| 36 | Run/Crank |
| 37 | - |
| 38 | - |
| 39 | - |
| 40 | Misc ignition |
| 41 | Trailer parking lamp |
| 42 | Park lamp right |
| 43 | - |
| 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) |
| 59 | A/C clutch |
| 60 | Active fuel management 1 |
| 61 | VES |
| 62 | Integrated chassis control module/CVS |
| 63 | Trailer battery |
| 64 | Starter Motor (LD & HD DSL) |
| 65 | Auxiliary underhood electrical center |
| 66 | Cooling fan motor left |
| 67 | Active fuel management 2 |
| 68 | - |
| 69 | Starter Pinion (LD) / Starter Motor (HD Gas) |
| 70 | 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 |
| 77 | Powertrain |
| 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 |
