The Chevrolet Tahoe and Suburban, redesigned for the 2021-2022 model years, represent the pinnacle of full-size SUVs, offering a blend of luxury, space, and advanced technology. Both vehicles are renowned for their powerful performance, spacious interiors, and versatility, making them ideal for families, long-distance travel, and towing needs. Central to the operation of these SUVs is their electrical system, with the fuse box and relays playing a crucial role in managing and protecting the numerous electrical components and systems.
The fuse box in the 2021-2022 Chevrolet Tahoe and Suburban is essential for safeguarding the vehicle’s electrical circuits. These circuits power a wide array of systems, including engine management, lighting, infotainment, climate control, and power accessories such as windows, seats, and the rear liftgate. Typically, these vehicles are equipped with multiple fuse boxes. The primary fuse box is located in the engine compartment, while additional fuse boxes may be found inside the cabin, often under the dashboard or in the cargo area. The engine compartment fuse box is responsible for managing high-power systems, such as those related to the engine and transmission, while the interior fuse boxes handle the vehicle’s comfort and convenience features.
Each fuse in these boxes is linked to a specific circuit and is designed to blow or break the circuit in the event of an overload or short circuit. This action prevents damage to critical components and avoids potential electrical fires. For example, if the infotainment system or power seats stop functioning, the first step in troubleshooting is to check the related fuse.
Relays in the Chevrolet Tahoe and Suburban are electrically operated switches that control the power supply to high-current systems like the starter motor, fuel pump, and cooling fans. These relays allow high-demand systems to be controlled by lower-power circuits, ensuring the safety and efficiency of the vehicle’s electrical system. By reducing the load on switches and wiring, relays help prevent electrical overloads and ensure reliable operation of key systems.
Regular inspection and maintenance of the fuse boxes and relays are crucial for preventing electrical issues. A blown fuse or faulty relay can lead to significant system failures, such as the vehicle not starting if the starter relay fails or overheating problems if the cooling fan relay is compromised. Ensuring that fuses and relays are in good working condition is essential for maintaining the functionality and safety of the Tahoe and Suburban.
Understanding the importance of the fuse box and relays in the Chevrolet Tahoe and Suburban helps owners ensure that their vehicles’ electrical systems operate smoothly and reliably. Proper maintenance of these components contributes to the overall dependability and longevity of these full-size SUVs, making them a reliable choice for both everyday use and long-distance travel.
MUST READ: DYI – How to Check Car Fuses?
(2021-2022) Chevrolet Tahoe & Suburban 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 Tahoe & Suburban 2021-2022 fuse assignment
Year of production: from 2021, 2022
Fuse Box Location
Passenger Compartment
The right instrument panel fuse block access door is on the passenger side edge of the instrument panel. Pull off the cover to access the fuse block. A fuse puller is available on the right instrument panel end cap.
Engine Compartment
Lift the cover to access the fuse block.
Luggage Compartment
The rear compartment fuse block is behind the access panel on the left side of the compartment. Pull the panel out by grabbing the finger access slot at the rear edge.
Fuse Box Diagrams
Instrument Panel Fuse Box Diagram
There are relays on the back of the fuse block. To access, press the tabs and remove the fuse block.Assignment of the fuses in the Instrument Panel Fuse Box
| № | Usage |
|---|---|
| F1 | Right Door |
| F2 | Left Door |
| F3 | Universal Garage Door Opener (UGDO)/ OnStar Hands-free Calling (OHC)/ Camera |
| F4 | Body Control Module 2 |
| F5 | Displays |
| F6 | Front Blower |
| F8 | Left Door Panel |
| F10 | Tilt/ Column Lock |
| F11 | USB/ Data Link Connector (DLC) |
| F12 | Central Gateway Module (CGM)/ Onstar |
| F14 | Right Door Panel |
| F17 | Steering Wheel Control |
| F18 | Active Vibration Module 1 |
| F19 | – |
| F20 | – |
| F21 | – |
| F22 | Heated Whee |
| F23 | – |
| F24 | – |
| F25 | Search Engine Optimization (SEO)/ UPFITTER |
| F26 | USB/ Search Engine Optimization (SEO) Retained Accessory Power (RAP) |
| F27 | Auxiliary Power Outlet (APO)/Retained Accessory Power |
| F28 | Spare |
| F30 | Sensing and Diagnostic Module/ Automatic Occupant Sensing |
| F31 | Body Control Module 3 |
| F32 | Center Stack Module (CSM)/ USB |
| F33 | Body Control Module 4 |
| F34 | Out of Park |
| F40 | – |
| F41 | – |
| F42 | Electric Park Brake Switch |
| F43 | Road Side Equipment |
| F44 | Active Vibration Module 2 |
| F45 | Radio Module |
| F46 | Body Control Module 1A |
| F47 | – |
| F48 | Telematics Control Module |
| F49 | Body Control Module 1 |
| F50 | Driver Monitoring System |
| F51 | – |
| F52 | – |
| F53 | – |
| F54 | Sunroof |
| F55 | Auxiliary Power Outlet 3 |
| F56 | Direct Current/ Direct Current Converter Battery 1 |
| F57 | Direct Current/ Direct Current Converter Battery 2 |
| F58 | Spare |
| F59 | – |
| Circuit Breakers | |
| CB1 | Auxiliary Power Outlet 1 |
| CB2 | Auxiliary Power Outlet 2 |
| Relays | |
| K1 | – |
| K2 | Retain Accessory Power/ Accessory 1 |
| K4 | Retain Accessory Power/ Accessory 2 |
| K5 | – |
Engine Compartment Fuse Box Diagram
Assignment of the fuses in the Engine Compartment Fuse Box
| № | Usage |
|---|---|
| 1 | – |
| 2 | – |
| 3 | – |
| 4 | – |
| 6 | Exterior Lighting Module 7 |
| 7 | Exterior Lighting Module 4 |
| 8 | – |
| 9 | Exterior Lighting Module 5 |
| 10 | Exterior Lighting Module 6 |
| 11 | Spare |
| 12 | – |
| 13 | Washer Front |
| 14 | Washer Rear |
| 15 | Rear Electrical Center 2 |
| 16 | Power Sounder |
| 17 | Spare |
| 19 | DC/AC Inverter |
| 20 | IECR 2 |
| 21 | – |
| 22 | IECL 2 |
| 24 | Electronic Brake Control Module |
| 25 | Rear Electrical Center 1 |
| 26 | Camera Wash |
| 27 | Horn |
| 28 | Headlamp Right |
| 29 | Headlamp Left |
| 30 | Exterior Lighting Module 3 |
| 31 | Exterior Lighting Module 1 |
| 32 | – |
| 33 | Not R/C |
| 34 | – |
| 37 | On Board Diagnostics (OBD) Body |
| 38 | MISC Body |
| 39 | Upfitter |
| 40 | MISC Instrument Panel (IP) |
| 41 | Trailer Parking Lamps |
| 42 | Right Taillamp |
| 44 | Trailer Tow |
| 45 | Secondary Axle Motor |
| 46 | Engine Control Module (ECM) Ignition |
| 47 | OBD Engine |
| 48 | – |
| 49 | Telematics Control Module |
| 50 | A/C Clutch |
| 51 | Transfer Case Control Module |
| 52 | Front Wiper |
| 53 | – |
| 54 | Left Taillamps |
| 55 | Trailer Back-up Lamp |
| 56 | Semi Active Damping System |
| 57 | Spare |
| 58 | Starter Motor |
| 60 | Active Fuel Management 1 |
| 61 | Automatic Lamp Control (ALC) Main |
| 62 | Integrated Chassis Control Module/Canister Vent Solenoid/Diesel Exhaust Fluid |
| 63 | Trailer Brake |
| 65 | Auxiliary Underhood Electrical Center |
| 66 | Left Cool Fan Motor |
| 67 | Active Fuel Management 2 |
| 68 | Automatic Lamp Control (ALC) Motor |
| 69 | Starter Pinion |
| 71 | Cool Fan Motor Lower |
| 72 | Right Cool Fan Motor/ Lower |
| 73 | Left Trailer Stop Turn Lamp |
| 74 | Trailer Interface Module 2 |
| 75 | Diesel Exhaust Fluid Controller |
| 76 | ELEC RNG BDS |
| 78 | Engine Control Module |
| 79 | – |
| 80 | Cabin Cool Pump 17W |
| 81 | Right Trailer Stop Turn Lamp |
| 82 | Trailer Interface Module 1 |
| 83 | Fuel Tank Zone Module |
| 84 | Trailer Battery |
| 85 | Engine |
| 86 | Engine Control Module |
| 87 | Injector B Even |
| 88 | O2 B Sensor |
| 89 | O2 A Sensor |
| 90 | Injector A Odd |
| 91 | Engine Control Module (ECM) Throttle Control |
| 92 | Cool Fan Clutch AERO Shutter |
| Relays | |
| 5 | – |
| 18 | DC/AC Inverter |
| 23 | – |
| 35 | Park Lamp |
| 36 | Run/Crank |
| 43 | Secondary Axle Motor |
| 59 | A/C Clutch |
| 64 | Starter Motor |
| 70 | Starter Pinion |
| 77 | Powertrain |
Rear Compartment Fuse Box Diagram
Assignment of the fuses in the Rear Compartment Fuse Box
| № | Usage |
|---|---|
| F1 | Remote Function Actuator |
| F2 | Wireless Charging Module |
| F3 | Heated Seat Module Row 1 (Battery 1) |
| F4 | Memory Seat Module (MSM) Driver |
| F5 | – |
| F6 | – |
| F7 | Amplifier Auxiliary 2 |
| F8 | – |
| F9 | Search Engine Optimization Upfitter 2 |
| F10 | Motor Seatbelt Passenger |
| F11 | Power Folding Seat Row 2 |
| F12 | GBS |
| F13 | – |
| F14 | – |
| F15 | Heated Seat Module Row 1 (Battery 2) |
| F16 | Right Hand Cinch Latch |
| F17 | Memory Seat Module Passenger |
| F18 | Rear Wiper |
| F19 | Motor Seatbelt Driver |
| F20 | Rear Defogger |
| F21 | – |
| F22 | Rear HVAC Display Control |
| F23 | External Object Calculation Module |
| F24 | Amplifier Auxiliary 3 |
| F25 | OBS DET |
| F26 | Rear Drive Control Module |
| F27 | Amplifier Auxiliary 1 |
| F28 | Video Processing Module |
| F29 | – |
| F30 | – |
| F31 | Amplifier |
| F32 | – |
| F33 | Integrated Chassis Control Module |
| F34 | Heated Seat Module Row 2 |
| F35 | HFCR |
| F36 | Exterior Lighting Module |
| F37 | – |
| F38 | Power Slide Console |
| F39 | – |
| F40 | – |
| F41 | – |
| F42 | – |
| F43 | Universal Park Assist |
| F44 | – |
| F45 | Adaptive Forward Lighting/ Automatic Headlamp Leveling |
| F46 | Rear HVAC Blower Motor |
| F47 | Left Hand Cinch Latch |
| F48 | Power Seat Recline Module |
| F49 | Lift Glass |
| F50 | Driver Power Seat |
| F51 | Power Liftgate Module |
| F52 | Passenger Power Seat |
| Relays | |
| K53 | – |
| K54 | – |
| K55 | L/GLASS |
Conclusion
For owners and enthusiasts of classic Chevrolet Tahoe & Suburban 2021-2022, 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.
