Chevrolet Silverado mk4 (4th Gen) (2019–2022) fuse box and relay Diagrams
The Chevrolet Silverado 4th Generation (2019–2022) is a robust full-size pickup truck known for its strong performance, advanced technology, and versatility. A key element of the Silverado’s reliability and functionality lies in its sophisticated electrical system, which includes multiple fuse boxes and relays.
The fuse boxes in the Silverado 4th Gen are strategically placed to protect various electrical circuits throughout the vehicle. Typically, there are two main fuse boxes: one in the engine compartment and another in the cabin. The engine compartment fuse box controls high-power circuits like the engine, transmission, and cooling fans, while the interior fuse box manages accessories and comfort features such as power windows, infotainment, and lighting. Each fuse is designed to blow in case of an electrical overload, safeguarding the vehicle’s wiring and components from damage.
Relays in the Silverado act as electrically controlled switches for high-current systems, including the starter, fuel pump, and various electronic control units (ECUs). These relays ensure that high-power systems are activated safely by low-current signals, preventing potential electrical failures. Regular inspection and maintenance of the fuses and relays are crucial to maintaining the Silverado’s electrical integrity and ensuring all systems function correctly.
MUST READ: DYI – How to Check Car Fuses?
(2019-2022) Chevrolet Silverado mk4 (4th 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 mk4 (4th Gen) 2019-2022 fuse assignment
- Cigar lighter (power outlet) fuses in the Chevrolet Silverado are the fuses № 27, 28 and circuit breakers CB1, CB2, CB3 and CB4 in the Right Instrument panel fuse box.
Year of production: from 2019, 2020, 2021, 2022
Fuse box location
Left Instrument Panel Fuse Block
It is located on the driver side edge of the instrument panel.
Right Instrument Panel Fuse Block
It is located on the passenger side edge of the instrument panel.
To access the back of the fuse block:
1. Push the tab at the top of block down;
2. Pull the top of the block outward;
3. Reverse Steps 1-2 to reinstall.
Engine compartment
Fuse box diagrams
Engine Compartment Fuse Block
| Fuses | Usage |
| 1 | High-beam left |
| 2 | High-beam right |
| 3 | Headlamp left |
| 4 | Headlamp right |
| 6 | 2019-2021: TIM |
| 7 | — |
| 8 | Fog lamp |
| 9 | 2019-2020: VKM |
| 10 | — |
| 11 | Police upfitter |
| 12 | — |
| 13 | Washer front |
| 14 | Washer rear |
| 15 | 2019-2021: MSB driver |
| 16 | — |
| 17 | IECL 1 |
| 19 | DC/AC inverter |
| 20 | 2019: IECR 2. 2020-2022: IECR 2 (LD) / EBCM2 (HD) |
| 21 | 2019-2021: MSB pass |
| 22 | IECL 2 |
| 24 | Eboost 1 / EBCM 1 |
| 25 | 2019-2021: REC |
| 26 | — |
| 27 | Horn |
| 28 | — |
| 29 | — |
| 30 | — |
| 31 | — |
| 32 | Rear window defogger |
| 33 | Heated mirror |
| 34 | Parking lamp left |
| 37 | 2019-2021: Euro trailer |
| 38 | 2019-2021: TIM |
| 39 | — |
| 40 | Misc ignition |
| 41 | Trailer parking lamp |
| 42 | Park lamp right |
| 44 | — |
| 45 | 2019-2021: 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/SBZA |
| 58 | 2019: Starter motor. 2020-2022: 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 | 2019: Starter pinion. 2020-2022: Starter Pinion (LD) / Starter Motor (HD Gas) |
| 71 | Cooling fan |
| 72 | Cooling fan right |
| 73 | Trailer stop/turn lamp left |
| 74 | 2019-2021: TIM 2022: 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 | 2019-2021: TIM 2022: 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 | 2019-2021: Cool fan clutch 2022: Cool fan clutch/ Aeroshutter |
| Relays | Usage |
| 5 | Headlamp |
| 18 | DC/AC inverter |
| 23 | Rear window defogger |
| 35 | Parking lamp |
| 36 | Run/Crank |
| 43 | 2019-2021: Second fuel pump |
| 59 | A/C clutch |
| 64 | 2019: Starter motor. 2020-2021: Starter Motor (LD & HD DSL) / Cool Fan Clutch (HD Gas) 2022: Starter Motor (LD & HD DSL) |
| 70 | 2019: Starter pinion. 2020-2022: Starter Pinion (LD) / Starter Motor (HD Gas) |
| 77 | Powertrain |
Instrument Panel Fuse Block (left side)
| Number | Usage |
| F1 | Rear heated seats left/right |
| F3 | 2019-2020: Euro trailer |
| F4 | — |
| F5 | 2019-2020: Front Bolster 2021-2022: Spare/MFEG (Multifunction End Gate) |
| F6 | Heated and cooled seats left/right |
| F8 | 2019-2020: Rear seat entertainment/ Theft deterrent |
| F9 | Passive entry/Passive start/Driver seat module |
| F10 | — |
| F11 | 2019-2020: Sunshade |
| F12 | Passenger power seat |
| F13 | Export power take off/ Special equipment option 1 |
| F14 | — |
| F15 | — |
| F16 | Amplifier |
| F17 | MFEG (Multifunction End Gate) |
| 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 | 2019-2020: Anti-theft |
| K8 | — |
Instrument Panel Fuse Block (Right)
The right instrument panel fuse block access door is on the passenger side edge of the instrument panel.
| Number | 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/ 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 | Discrete Logic Ignition Switch (DLIS) |
| F20 | Cooled seats |
| F21 | NOT R/C |
| F22 | Heated steering wheel |
| F23 | MISC R/C |
| F24 | 2019-2021: Instrument panel cluster ignition/ Overhead 2022: Power Take Off/ Reflective Light Auxiliary Display/ Instrument Panel Cluster/ Central Gateway Module/ Inside Rear View Mirror/ Overhead Console Module Ignition |
| 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 | Central Gateway Module (CGM) |
| F41 | Infotainment 1 |
| F42 | Telematics Connectivity Platform (TCP) |
| F43 | — |
| F44 | 2019-2021: Active vibration management (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 | 2019-2021: Accessory power outlet 3 |
| CB4 | 2019-2021: Accessory power outlet 4 |
| Relays | |
| K1 | Run/Crank |
| K2 | Retained accessory power/ Accessory 1 |
| K4 | 2019-2021: Retained accessory power/ Accessory 2 |
| K5 | — |
Conclusion
For owners and enthusiasts of classic Chevrolet Silverado mk4 (4th Gen) 2019-2022, 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.