Toyota Avalon XX50 2018-2022 Fuses: Complete Guide

ByAlex Smidt

The Toyota Avalon XX50 (2018–2022) uses a multi-box fuse and relay architecture to protect its electrical systems. Whether you are dealing with a dead accessory, a non-functional power outlet, or a failed lighting circuit, knowing the exact fuse location, amperage, and function is essential for fast, safe diagnosis. This guide covers every fuse in every box of the fifth-generation Avalon, including the engine compartment fuse block, the instrument panel fuse block, and the additional relay/fuse sub-boxes present on this generation.

Fuse Box Locations on the Toyota Avalon XX50

The 2018–2022 Toyota Avalon XX50 has three primary fuse and relay centers:

  • Engine Compartment Fuse Block (EFB) – located in the engine bay on the driver’s side, near the battery
  • Instrument Panel Fuse Block (IPFB) – located under the instrument panel on the driver’s side, behind the lower trim cover
  • Junction Block / Relay Box – integrated within or adjacent to the engine compartment fuse block

Engine Compartment Fuse Block – Complete Fuse List

  • FL1 – 120A – Main (AM1) battery fuse
  • FL2 – 80A – EFI main fuse / fuel injection supply
  • FL3 – 60A – Alternator fuse (ALT)
  • FL4 – 40A – ABS/VSC actuator motor fuse
  • FL5 – 30A – ABS/VSC solenoid fuse
  • FL6 – 30A – EPS (electric power steering) fuse
  • FL7 – 30A – AM2 ignition fuse
  • FL8 – 20A – ECU-IG fuse (ignition-controlled ECU supply)
  • FL9 – 15A – Headlight relay supply (HI/LO)
  • FL10 – 10A – Radiator fan relay control
  • F1 – 7.5A – ECU-B (battery-direct ECU power)
  • F2 – 10A – EFI relay coil fuse
  • F3 – 15A – Cooling fan low-speed relay
  • F4 – 30A – Cooling fan high-speed fuse
  • F5 – 30A – A/C compressor magnetic clutch fuse
  • F6 – 40A – Front wiper motor fuse
  • F7 – 20A – Blower motor (HVAC) fuse
  • F8 – 10A – Horn fuse
  • F9 – 7.5A – Stop light switch / brake light fuse
  • F10 – 15A – Backup (reverse) camera / parking sensor fuse
  • F11 – 10A – Headlight cleaner relay
  • F12 – 15A – Fog light fuse (if equipped)
  • F13 – 20A – Seat heater / ventilated seat fuse
  • F14 – 30A – Power window master switch (driver)
  • F15 – 20A – Power window relay (rear)
  • F16 – 15A – Outside mirror heater / fold fuse
  • F17 – 10A – Turn signal / hazard fuse
  • F18 – 10A – Daytime running light (DRL) fuse
  • F19 – 20A – Sunroof / moonroof motor fuse
  • F20 – 30A – Trunk lid / power rear door fuse

Instrument Panel Fuse Block – Complete Fuse List

  • P1 – 10A – Combination meter / instrument cluster
  • P2 – 10A – Multifunction display / navigation unit
  • P3 – 15A – Audio system (head unit)
  • P4 – 7.5A – Wireless charger (Qi pad, if equipped)
  • P5 – 10A – USB charging ports (front)
  • P6 – 10A – USB charging ports (rear)
  • P7 – 20A – Cigarette lighter / accessory socket (front)
  • P8 – 20A – Accessory socket (rear center console)
  • P9 – 10A – OBD-II diagnostic port power fuse
  • P10 – 7.5A – Body control module (BCM/multiplex ECU)
  • P11 – 10A – Door lock actuators fuse
  • P12 – 10A – Keyless entry / smart key ECU
  • P13 – 7.5A – Anti-theft / immobiliser system
  • P14 – 10A – Interior courtesy lights / dome light
  • P15 – 10A – Glove box light / vanity mirror illumination
  • P16 – 15A – Heated steering wheel fuse
  • P17 – 20A – Driver power seat (fore/aft, recline)
  • P18 – 20A – Passenger power seat fuse
  • P19 – 15A – Memory seat / mirror position module
  • P20 – 10A – Rear view mirror (auto-dimming / compass)
  • P21 – 10A – Lane departure alert / pre-collision system ECU
  • P22 – 10A – Adaptive cruise control / radar ECU
  • P23 – 10A – Parking assist monitor ECU
  • P24 – 7.5A – 360-degree camera system (if equipped)
  • P25 – 15A – Rain-sensing wiper control module
  • P26 – 10A – Rear window defroster relay coil
  • P27 – 30A – Rear window defroster heater element
  • P28 – 10A – Climate control panel / HVAC control unit
  • P29 – 10A – Telematics / connected services module (DCM)
  • P30 – 10A – Amplifier (JBL premium audio, if equipped)

Important Relay Functions in the Engine Compartment Block

  • EFI Main Relay – controls power to the fuel injection system; if this relay fails the engine will not start
  • Circuit Opening Relay – controls the fuel pump circuit in conjunction with the ECM
  • Cooling Fan Relay (Low / High) – two-speed control for the electric radiator fan
  • A/C Relay – energises the compressor magnetic clutch when A/C is requested
  • Headlight Relay – feeds the low-beam and high-beam LED/halogen circuits
  • Starter Relay – high-current relay in the engine bay that engages the starter motor

How to Identify a Blown Fuse on the Avalon XX50

  • Use the fuse puller tool stored inside the instrument panel fuse block cover
  • Pull the suspect fuse straight out and hold it up to a light source – a broken internal wire or darkened plastic indicates a blown fuse
  • Always replace with the exact same amperage rating; never install a higher-rated fuse
  • If a replacement fuse blows immediately, there is a short circuit in the associated wiring harness – do not keep replacing fuses without diagnosing the root cause
  • The Avalon XX50 uses standard blade (ATC/ATO), mini blade (ATM), and maxi blade (AMI) type fuses depending on the circuit
  • Spare fuses are located in a small pocket inside the instrument panel fuse block lid

Common Electrical Issues Traced to Fuses on the 2018–2022 Avalon

  • Infotainment screen goes blank – check P2 (10A navigation/display) and P3 (15A audio)
  • Power seats inoperative – check P17 and P18 (20A each)
  • USB ports not charging – check P5 and P6 (10A USB fuses)
  • Pre-collision system warning light – check P21 (10A safety ECU fuse)
  • Rear defroster not working – check P26 (relay coil) and P27 (30A heater element)
  • No crank / no start – inspect FL7 (30A AM2), F2 (EFI relay), and the starter relay in the engine block

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