Toyota Tundra XK70 2021+ Fuses: Complete Guide

ByAlex Smidt

The Toyota Tundra XK70 (2021 and newer) uses a multi-box fuse and relay system distributed across several locations in the vehicle. Understanding the fuse layout is essential for diagnosing electrical failures, replacing blown fuses safely, and avoiding costly dealership visits for simple electrical issues. This guide covers every fuse box location, each fuse number, amperage rating, and exact circuit function for the third-generation Tundra built from 2021 onward.

Fuse Box Locations on the Toyota Tundra XK70

The 2021+ Toyota Tundra features three primary fuse and relay box locations:

  • Instrument Panel Fuse Box (Driver Side) – located beneath the dashboard on the driver’s side, accessible by removing the lower trim panel
  • Engine Compartment Fuse Box (Main) – located in the engine bay on the driver’s side near the battery
  • Engine Compartment Relay Box (Secondary) – also located in the engine bay, often adjacent to the main box

Instrument Panel Fuse Box – Full Fuse List

  • Fuse 1 – 7.5A – Gauges, warning lights, instrument cluster
  • Fuse 2 – 10A – Stop lights, brake switch circuit
  • Fuse 3 – 10A – Shift lock ECU, transmission control
  • Fuse 4 – 7.5A – Engine control module (ECM) backup power
  • Fuse 5 – 15A – ACC socket, accessory outlet
  • Fuse 6 – 20A – Power windows rear circuits
  • Fuse 7 – 20A – Power windows front circuits
  • Fuse 8 – 10A – Door control modules, smart entry system
  • Fuse 9 – 10A – Multi-information display, center console switches
  • Fuse 10 – 7.5A – Interior lights, map lamps, dome light
  • Fuse 11 – 10A – HVAC blower control, climate system ECU
  • Fuse 12 – 15A – Audio system, multimedia head unit
  • Fuse 13 – 10A – Rear entertainment system
  • Fuse 14 – 7.5A – Parking brake system, electric park brake ECU
  • Fuse 15 – 10A – Theft deterrent system, immobilizer
  • Fuse 16 – 10A – SRS airbag ECU
  • Fuse 17 – 7.5A – Combination meter, odometer
  • Fuse 18 – 15A – Heated steering wheel, seat heating controls
  • Fuse 19 – 10A – Wireless charging pad, USB power ports
  • Fuse 20 – 20A – Cigarette lighter socket
  • Fuse 21 – 10A – Power mirror adjustment, mirror defrost
  • Fuse 22 – 10A – Rear camera, backup camera display circuit
  • Fuse 23 – 7.5A – Body control module (BCM) primary feed
  • Fuse 24 – 10A – Turn signal relay, hazard lights
  • Fuse 25 – 10A – Wiper motor front, washer pump
  • Fuse 26 – 15A – Rear wiper and washer
  • Fuse 27 – 10A – Power door locks, central locking actuators
  • Fuse 28 – 10A – Radio backup, clock memory retention
  • Fuse 29 – 7.5A – Cruise control system
  • Fuse 30 – 15A – 12V power outlet rear seat area

Engine Compartment Main Fuse Box – Full Fuse List

  • Fuse 1 – 120A – Main battery feed to BCM and body electrical
  • Fuse 2 – 80A – ABS/VSC actuator motor pump
  • Fuse 3 – 60A – Engine cooling fan motor
  • Fuse 4 – 50A – Electric power steering (EPS) motor
  • Fuse 5 – 40A – Blower motor, HVAC fan high speed
  • Fuse 6 – 40A – Alternator charge circuit
  • Fuse 7 – 30A – Fuel injection relay, fuel pump circuit
  • Fuse 8 – 30A – Ignition switch AM1 feed
  • Fuse 9 – 30A – Trailer tow connector, 7-pin trailer output
  • Fuse 10 – 20A – Headlight relay feed, DRL circuit
  • Fuse 11 – 20A – Fog lights, front auxiliary lighting
  • Fuse 12 – 20A – Rear defroster, heated rear glass
  • Fuse 13 – 15A – Horn relay, horn circuit
  • Fuse 14 – 15A – ECM main relay circuit
  • Fuse 15 – 15A – Transmission control module (TCM)
  • Fuse 16 – 15A – 4WD control ECU, transfer case actuator
  • Fuse 17 – 10A – Oxygen sensors, exhaust temperature sensors
  • Fuse 18 – 10A – Purge VSV, EVAP emission control system
  • Fuse 19 – 10A – Vehicle stability control (VSC) ECU logic
  • Fuse 20 – 10A – ABS ECU logic feed
  • Fuse 21 – 10A – TPMS receiver, tire pressure sensors
  • Fuse 22 – 10A – Pre-collision system sensor, radar unit
  • Fuse 23 – 10A – Lane departure alert camera module
  • Fuse 24 – 10A – Adaptive variable suspension ECU (if equipped)
  • Fuse 25 – 15A – Tow hitch trailer brake controller
  • Fuse 26 – 10A – Ambient temperature sensor, outside temp display
  • Fuse 27 – 7.5A – Knock sensor circuit, ignition timing ECU
  • Fuse 28 – 30A – Running boards power retract motors (if equipped)
  • Fuse 29 – 20A – Bed lighting, cargo area lamp
  • Fuse 30 – 15A – Underhood work light

Important Notes for Replacing Fuses on the XK70 Tundra

  • Always use the same amperage rating – installing a higher-rated fuse can cause wiring harness fires
  • The XK70 uses standard ATC/ATO blade fuses for most circuits and maxi/mini blade fuses for high-current engine bay circuits
  • A blown fuse on the ECM, TCM, or ABS ECU will trigger a stored DTC and illuminate the check engine or traction control warning light
  • After replacing a fuse for the audio, BCM, or power windows, a reset or re-initialization procedure may be required
  • The SRS airbag fuse should only be replaced with the battery disconnected to prevent accidental deployment
  • Toyota recommends inspecting the fuse box for moisture ingress or corrosion during any electrical diagnosis on high-mileage XK70 units
  • Spare fuses are stored in the engine compartment fuse box lid and inside the owner’s manual pouch

Common Electrical Faults Traced to Fuses on the 2021+ Tundra

  • No crank / no start – check main 120A fuse and ECM relay fuse in engine bay
  • Infotainment screen blank – check audio fuse 12 and radio backup fuse 28 in the instrument panel box
  • Power windows inoperative – check fuses 6 and 7 in the instrument panel box
  • Trailer brake controller not working – inspect fuse 25 in engine compartment box
  • 4WD will not engage – verify fuse 16 for the transfer case ECU
  • Pre-collision warning system off – fuse 22 in the engine bay box controls radar module power
  • Backup camera no image – check fuse 22 in the instrument panel box for camera circuit power

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