The Chevrolet Blazer (2019-2022) offers advanced features like a powerful V6 engine, a touchscreen infotainment system with Apple CarPlay and Android Auto, and enhanced safety features such as blind-spot monitoring and lane-keeping assist. These systems rely on a well-designed electrical system, with the fuse box and relays playing key roles in maintaining functionality.
The fuse box, located in the engine bay and cabin, protects various electrical components by preventing overloads. Important systems such as lighting, climate control, and the infotainment system are safeguarded by specific fuses that will blow if a circuit becomes overloaded.
The relays in the Blazer control high-power systems like the fuel pump, cooling fans, and power windows. Acting as switches, these relays allow smaller control currents to manage larger loads. If a relay fails, it can cause significant issues, such as the vehicle not starting or key systems like the air conditioning or fuel pump malfunctioning.
Regular inspection of the fuses and relays ensures that all systems in the Chevrolet Blazer continue to operate efficiently, maintaining both performance and safety features.
MUST READ: DYI – How to Check Car Fuses?
(2019-2022) Chevrolet Blazer 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 Blazer 2019-2022 fuse assignment
- Cigar lighter / power outlet fuses in the Chevrolet Blazer are the circuit breakers №42 (Auxiliary power outlet/Lighter) in the Instrument panel fuse box and CB3 (Rear auxiliary power outlet) in the Rear Compartment Fuse Box.
Year of production: from 2019, 2020, 2021, 2022
Fuse box location
Instrument Panel
The fuse box is located inside the center console on the passenger side of the vehicle, behind the cover.
Engine Compartment
Rear Compartment
The fuse box is located behind a trim panel on the driver side of the rear storage compartment.
Fuse box diagrams
Instrument Panel
Assignment of the fuses and relays in the Instrument Panel (2019, 2020, 2021, 2022)
| № | Usage |
|---|---|
| F1 | Body control module 6 |
| F2 | Diagnostic link/ Central gateway module |
| F3 | Electric steering column lock |
| F4 | Not Used |
| F5 | Not Used |
| F6 | Heating, ventilation, and air conditioning |
| F7 | Body control module 3 |
| F8 | Not Used |
| F9 | Right front heated seat |
| F10 | Airbag/Seatbelt |
| F11 | Not Used |
| F12 | Amplifier/Noise control module |
| F13 | Body control module 7 |
| F14 | Left front heated seat |
| F15 | Not Used |
| F16 | Sunroof |
| F17 | Not Used |
| F18 | Instrument panel cluster |
| F19 | Body control module 1 |
| F20 | Rear seat entertainment |
| F21 | Body control module 4 |
| F22 | Infotainment USB data/Aux jack |
| F23 | Body control module 2 |
| F24 | USB charger/ Wireless charging |
| F25 | Park assist |
| F26 | CIM ( Communications integration module) |
| F27 | Not Used |
| F28 | Heating, ventilation, and air conditioning/ Information communication system display |
| F29 | Radio |
| F30 | Steering wheel adjustment controls |
| F31 | 2019: Front blower. 2020-2022: Electric brake control module electric brake booster |
| F32 | DC AC inverter |
| F33 | Driver power seat |
| F34 | Passenger power seat |
| F35 | Battery IEC 1 feed |
| F36 | Electric power steering |
| F37 | Rear seat entertainment/USB charge/Wireless charging module/ Auxiliary power outlet/Lighter |
| F38 | Body control module 8 |
| F39 | Not Used |
| F40 (CB) | Not Used |
| F41 (CB) | Not Used |
| F42 (CB) | Auxiliary power outlet/Lighter |
Engine Compartment
Assignment of the fuses and relays in the Engine Compartment (2019, 2020, 2021, 2022)
| № | Usage |
|---|---|
| F1 | Antilock brake system pump |
| F2 | Starter 1 |
| F3 | DC DC transformer 1 |
| F4 | Not Used |
| F5 | DC DC transformer 2 |
| F6 | Not Used |
| F7 | 2019: Electronic brake control module. 2020-2022: Front blower |
| F8 | Starter 3 |
| F9 | Not Used |
| F10 | Not Used |
| F11 | Not Used |
| F12 | Front wiper |
| F13 | 2020-2022: Starter 2 |
| F14 | Not Used |
| F15 | Rear wiper |
| F16 | Not Used |
| F17 | Not Used |
| F18 | Not Used |
| F19 | Not Used |
| F20 | Not Used |
| F21 | Not Used |
| F22 | Electronic brake control module |
| F23 | Parking/Trailer lamps |
| F24 | Right trailer stoplamp/Turnlamp |
| F25 | 2019-2021: Steering column lock |
| F26 | Not Used |
| F27 | Left trailer stoplamp/Turnlamp |
| F28 | Not Used |
| F29 | Not Used |
| F30 | Washer pump |
| F31 | 2019-2021: Spare/Right low-beam headlamp |
| F32 | Left low-beam headlamp |
| F33 | 2019-2021: High-beam headlamp shutter/ Fog lamps 2022: High-Beam Headlamp Shutter |
| F34 | Horn |
| F35 | Not Used |
| F36 | 2019-2021: Right low-beam/ Left high-beam headlamp 2022: Right Low-Beam |
| F37 | Spare/Right high-beam headlamp |
| F38 | 2019-2021: Automatic headlamp leveling motor |
| F39 | Transmission control module |
| F40 | Left rear bus electrical center/DC DC ignition |
| F41 | Instrument cluster |
| F42 | Heating, ventilation, and air conditioning/ Central gateway module run/crank |
| F43 | Reflective light alert display |
| F44 | Electronic brake control module/ Electric brake booster/Run/crank |
| F45 | Not Used |
| F46 | Not Used |
| F47 | Not Used |
| F48 | Not Used |
| F49 | Interior rearview mirror |
| F50 | Fuel system control module/Fuel tank zone module run/ crank |
| F51 | Heated steering wheel |
| F52 | Air conditioning clutch |
| F53 | 2022: Coolant Pump |
| F54 | 2019-2021: Coolant pump |
| F55 | Not Used |
| F56 | Not Used |
| F57 | Engine control module/lgnition |
| F58 | Transmission control module/ Ignition |
| F59 | Engine control module battery |
| F60 | Not Used |
| F61 | O2 sensor 1/ Aeroshutter/Mass air flow sensor |
| F62 | Engine control module-odd |
| F63 | O2 sensor 2 |
| F64 | Engine control module-even |
| F65 | Engine control module powertrain 1 |
| F66 | Engine control module powertrain 2 |
| F67 | Engine control module powertrain 3 |
| F68 | Not Used |
| F69 | Not Used |
| F70 | Not Used |
| F71 | Not Used |
| F72 | Not Used |
| F73 | Not Used |
| F74 | Not Used |
| F75 | Not Used |
| F76 | Not Used |
| F77 | Not Used |
| Relays | |
| K1 | Starter 1 |
| K2 | Run/Crank |
| K3 | Starter 3 |
| K4 | Not Used |
| K5 | Not Used |
| K6 | 2019-2021: Coolant pump |
| K7 | Engine control module |
| K8 | Air conditioning |
| K9 | Not Used |
| K10 | 2019: Not Used. 2020-2022: Starter 2 |
Rear Compartment
Assignment of the fuses and relays in the Rear Compartment (2019, 2020, 2021, 2022)
| № | Usage |
|---|---|
| F1 | Not Used |
| F2 | Trailer battery |
| F3 | Not Used |
| F4 | Rear blower |
| F5 | Rear drive control 1 |
| F6 | Not Used |
| F7 | Right window |
| F8 | Rear window defogger |
| F9 | Left window |
| F10 | Not Used |
| F11 | Trailer reverse |
| F12 | Not Used |
| F13 | Not Used |
| F14 | Not Used |
| F15 | Not Used |
| F16 | Not Used |
| F17 | Not Used |
| F18 | Not Used |
| F19 | Not Used |
| F20 | Glove box door/ Trailer stoplamp |
| F21 | Not Used |
| F22 | Not Used |
| F23 | Not Used |
| F24 | Not Used |
| F25 | Not Used |
| F26 | Trailer brake |
| F27 | Driver ventilated seat/Lumbar |
| F28 | Passive entry/ Passive start |
| F29 | Not Used |
| F30 | Canister vent |
| F31 | Not Used |
| F32 | Heated mirrors |
| F33 | Not Used |
| F34 | Liftgate module |
| F35 | Fuel system control module/Fuel tank zone module |
| F36 | Passenger ventilated seat/ Lumbar |
| F37 | Not Used |
| F38 | Window module |
| F39 | Rear closure |
| F40 | Memory seat module |
| F41 | Automatic occupancy sensor |
| F42 | Not Used |
| F43 | Not Used |
| F44 | Not Used |
| F45 | Liftgate motor |
| F46 | Rear heated seats |
| F47 | Not Used |
| F48 | Not Used |
| F49 | Not Used |
| F50 | Not Used |
| F51 | Not Used |
| F52 | Rear drive control 2/ Semi-active dampening system module |
| F53 | Video |
| F54 | External object calculating/Side blind zone alert |
| F55 | Not Used |
| F56 | Universal remote/ Rain sensor |
| F57 | Alarm overhead console/Theft deterrent |
| CB1 | Not Used |
| CB2 | Not Used |
| CB3 | Rear auxiliary power outlet |
| K1 | Not Used |
Conclusion
For owners and enthusiasts of classic Chevrolet Blazer 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.