Dayco 5040478 Serpentine Belt - Water Pump or Alternator and Air Conditioning
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Dayco

Dayco 5040478 Serpentine Belt - Water Pump or Alternator and Air Conditioning

Brand Dayco 5040478
Position Water Pump, Alternator and Air Conditioning
Color Black
Cross Section K-Section
Effective Length 47.75
Effective Length 1212.85
Material EPDM, Aramid Reinforced
Maximum Operating Temperature 100
Maximum Operating Temperature 212
Minimum Operating Temperature -45
Minimum Operating Temperature -42.7
Outside Circumference 48.41
Outside Circumference 1229.62
Rib Depth Standard
Rib Profile Straight Rib
Rib Quantity 4
Standards SAE J1459, SAE J2432
Top Width .54
Fits Toyota and Scion · 13 vehicles

Aramid reinforced. EPDM construction adds strength and wear resistance.

Straight rib profile. Helps maintain consistent grip and smooth power transfer.

SAE standards. Built to meet J1459 and J2432 requirements.

Cross-references ACDelco 4K476, CARQUEST K040476 and Driveworks 478K4 for the same application. See all 10.

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Dayco Serpentine Belt 5040478 Overview

The Dayco 5040478 serpentine belt is a K-section accessory drive belt built for vehicles that rely on a single belt to run the water pump, alternator, and air conditioning compressor. It is a direct-fit replacement for select Toyota Yaris and Scion xA/xB applications, with EPDM construction and aramid reinforcement for stable operation across a wide temperature range.

  • EPDM, aramid reinforced construction for durability in accessory drive service
  • Black belt with 4 ribs and a straight rib profile
  • K-section cross section with standard rib depth
  • Effective length: 1212.85 mm / 47.75 in
  • Outside circumference: 1229.62 mm / 48.41 in
  • Top width: 0.54 in
  • Operating temperature range: -45°F to 212°F
  • Meets SAE J1459 and SAE J2432 standards

Fitment Details

Fits 2013-2018 Toyota Yaris, Water Pump, Alternator and Air Conditioning. Fits 2012 Toyota Yaris, Water Pump, Alternator and Air Conditioning, Mfg. After 03/2012; w/A.C. Fits 2004-2006 Scion xA, Water Pump, Alternator and Air Conditioning. Fits 2004-2006 Scion xB, Water Pump, Alternator and Air Conditioning.

This part cross-references Toyota 90916-02556 and 90916-02705 for the same application.

What This Belt Helps Address

  • Squealing or chirping from a worn accessory drive belt
  • Cracking, glazing, or rib wear on the belt surface
  • Loss of drive to the alternator, water pump, or A/C compressor
  • Reduced belt tracking caused by age or heat cycling
  • Service replacement for Toyota Yaris and Scion xA/xB belt maintenance

Installation Notes

Verify the vehicle’s belt routing, rib count, and length before installation. This Dayco serpentine belt is specified for vehicles with air conditioning in the listed Toyota Yaris applications, including 2012 models built after 03/2012. Inspect pulleys, tensioner condition, and accessory alignment during service to help prevent premature belt wear.

Quality Assurance

Dayco manufactures this belt to SAE J1459 and SAE J2432 standards, using EPDM and aramid reinforcement for consistent performance in accessory drive systems.

Related reading

This part fits 13 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2018ToyotaYaris1.5LL4Water Pump, Alternator and Air ConditioningCompatible with vehicles containing air conditioning.
2017ToyotaYaris1.5LL4Water Pump, Alternator and Air ConditioningCompatible with vehicles containing air conditioning.
2016ToyotaYaris1.5LL4Water Pump, Alternator and Air ConditioningCompatible with vehicles containing air conditioning.
2015ToyotaYaris——Water Pump, Alternator and Air ConditioningCompatible with vehicles containing air conditioning.
2014ToyotaYaris——Water Pump, Alternator and Air ConditioningCompatible with vehicles containing air conditioning.
2013ToyotaYaris——Water Pump, Alternator and Air ConditioningCompatible with vehicles containing air conditioning.
2012ToyotaYaris——Water Pump, Alternator and Air ConditioningMfg. After 03/2012; w/A.C.
2006ScionxA——Water Pump, Alternator and Air Conditioning—
2006ScionxB——Water Pump, Alternator and Air Conditioning—
2005ScionxA——Water Pump, Alternator and Air Conditioning—
2005ScionxB——Water Pump, Alternator and Air Conditioning—
2004ScionxA——Water Pump, Alternator and Air Conditioning—
2004ScionxB——Water Pump, Alternator and Air Conditioning—
Directly replaces or cross-references 10 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACDelco — 4K476CARQUEST — K040476Driveworks — 478K4Duralast — 478K4Gates — K040476Goodyear — 4040477NAPA — 25-040476Renault — 77.00.853.887Toyota — 90916-02556Toyota — 90916-02705