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Standard Ignition RY-721 Rear Window Defroster RelayOE Quality 60-Day Returns
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Standard Ignition RY-721 Rear Window Defroster Relay - view 7
Part #: RY-721

Standard Ignition RY-721 Rear Window Defroster Relay

⚙️ 240 vehicles fit this part
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✅OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Honda and Acura, CR-V, HR-V, Pilot, Accord, Civic, MDX, TLX, Odyssey, Ridgeline, TSX, ZDX, Crosstour, Fit, RDX, RL, and TL
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Reliable Window Defroster Relay for Acura, Honda, and Subaru Vehicles

The Standard Ignition RY-721 window defroster relay is designed to provide consistent performance for your vehicle's defrost system. Engineered to meet the specific electrical requirements of Acura, Honda, and Subaru models, this relay ensures reliable operation during cold weather conditions.

  • Compatible with multiple Acura, Honda, and Subaru models including Accord, Civic, CR-V, Forester, and more
  • Part number RY-721 for precise identification and fitment
  • Designed to control the window defroster circuit efficiently
  • Durable construction to withstand automotive electrical demands
  • Direct replacement for factory-installed relays

Product Details and Compatibility

The Standard Ignition RY-721 window defroster relay is engineered to fit a wide range of vehicles such as the Acura MDX, Honda Odyssey, and Subaru Outback. This relay plays a critical role in activating the rear window defroster, helping to clear frost, ice, and condensation. Its design matches OEM specifications to ensure seamless integration with your vehicle’s electrical system. Using the correct relay like the RY-721 helps maintain the defroster’s functionality and prevents electrical issues related to faulty relay components.

Common Applications and Issues Addressed

  • Restores rear window defroster functionality in Acura, Honda, and Subaru vehicles
  • Resolves intermittent or non-functioning defroster problems
  • Prevents electrical shorts or relay failure in the defroster circuit
  • Eliminates delayed defroster activation or inconsistent heating
  • Supports safe driving visibility during cold or humid conditions

Installation Notes and Tips

  • Ensure vehicle ignition is off before replacing the relay
  • Locate the relay in the fuse box or relay panel as specified in the vehicle’s service manual
  • Compare the new relay (RY-721) with the old one to confirm correct part number and pin configuration
  • Handle the relay carefully to avoid damage to terminals
  • Test the defroster system after installation to verify proper operation

Quality Assurance and Warranty

Standard Ignition manufactures the RY-721 window defroster relay to meet industry standards for durability and performance. While specific warranty details may vary, Standard Ignition products typically come with a limited warranty against defects in materials and workmanship. Using a genuine replacement relay like the RY-721 helps maintain the reliability of your Acura, Honda, or Subaru defroster system.

BrandStandard Ignition
Part NumberRY-721
Connector ShapeRectangular
ContentsRelay
Continuous DutyNo
FunctionsRelay
Mounting Bracket(s) IncludedNo
Terminal GenderMale
Terminal TypeBlade
Voltage12

This part fits 240 vehicles. Search below:

YearMakeModel# DoorsTransmissionLitersCylindersPositionNotes
2024AcuraIntegraN/A
2024AcuraRDXN/A
2024HondaCivicN/A
2024HondaCR-VN/A
2023AcuraIntegraN/A
2023AcuraRDXN/A
2023HondaCivicN/A
2023HondaCR-VN/A
2023HondaRidgelineN/A
2022AcuraRDXN/A
2022HondaAccordN/A
2022HondaCivicN/A
2022HondaCR-VN/A
2022HondaInsightN/A
2022HondaOdysseyN/A
2022HondaRidgelineN/A
2021AcuraRDXN/A
2021HondaAccordN/A
2021HondaCivicN/A
2021HondaClarityN/A
2021HondaCR-VN/A
2021HondaHR-VN/A
2021HondaInsightN/A
2021HondaOdysseyN/A
2021HondaPassportN/A
2021HondaPilotN/A
2021HondaRidgelineN/A
2020AcuraRDXN/A
2020AcuraTLXN/A
2020HondaAccordN/A
2020HondaCivicN/A
2020HondaClarityN/A
2020HondaCR-VN/A
2020HondaHR-VN/A
2020HondaInsightN/A
2020HondaOdysseyN/A
2020HondaPassportN/A
2020HondaPilotN/A
2020HondaRidgelineN/A
2019AcuraRDXN/A
2019AcuraTLXN/A
2019HondaAccordN/A
2019HondaCivicN/A
2019HondaClarityN/A
2019HondaCR-VN/A
2019HondaHR-VN/A
2019HondaInsightN/A
2019HondaOdysseyN/A
2019HondaPassportN/A
2019HondaPilotN/A
2019HondaRidgelineN/A
2018AcuraTLXN/A
2018HondaAccordN/A
2018HondaCivicN/A
2018HondaClarityN/A
2018HondaCR-VN/A
2018HondaHR-VN/A
2018HondaOdysseyN/A
2018HondaPilotN/A
2018HondaRidgelineN/A
2018SubaruOutbackN/AIn Fuse Panel
2017AcuraMDX3.0LV6N/A
2017AcuraNSX3.5LV6N/A
2017AcuraRLX3.5LV6N/A
2017AcuraTLX2.4LL4N/A
2017HondaAccord2 DoorN/A
2017HondaCivicN/A
2017HondaClarityN/A
2017HondaCR-VN/A
2017HondaHR-VN/A
2017HondaOdyssey3.5LV6N/A
2017HondaPilotN/A
2017HondaRidgeline3.5LV6N/A
2017SubaruOutbackN/AIn Fuse Panel
2016AcuraMDX3.5LV6N/A
2016AcuraRLX3.5LV6N/A
2016AcuraTLX2.4LL4N/A
2016HondaAccord2 DoorN/A
2016HondaCivicN/A
2016HondaCR-VN/A
2016HondaCR-ZN/A
2016HondaHR-VN/A
2016HondaOdyssey3.5LV6N/A
2016HondaPilotN/A
2016SubaruLegacyN/A
2016SubaruOutbackN/AIn Fuse Panel
2015AcuraMDXN/A
2015AcuraRLX3.5LV6N/A
2015AcuraTLXN/A
2015HondaAccord2 DoorN/A
2015HondaCR-VN/A
2015HondaCR-ZN/A
2015HondaCrosstourN/A
2015HondaOdysseyN/A
2015HondaPilotN/A
2015SubaruLegacyN/A
2015SubaruOutbackN/A
2014AcuraMDXN/A
2014AcuraRLX3.5LV6N/A
2014AcuraTL3.5LV6N/A
2014HondaAccord2 DoorN/A
2014HondaCR-VN/A
2014HondaCR-ZN/A
2014HondaCrosstourN/A
2014HondaOdysseyN/A
2014HondaPilotN/A
2014HondaRidgelineN/A
2014SubaruLegacyN/A
2014SubaruOutbackN/A
2013AcuraMDXN/A
2013AcuraTL3.5LV6N/A
2013AcuraTSXN/A
2013AcuraZDXN/A
2013HondaAccordN/A
2013HondaCR-VN/A
2013HondaCR-ZN/A
2013HondaCrosstourN/A
2013HondaFitN/A
2013HondaOdysseyN/A
2013HondaPilotN/A
2013HondaRidgelineN/A
2013SubaruLegacyN/A
2013SubaruOutbackN/A
2012AcuraMDXN/A
2012AcuraRDX2.3LL4N/A
2012AcuraRL3.7LV6N/A
2012AcuraTL3.5LV6N/A
2012AcuraTSXN/A
2012AcuraZDXN/A
2012HondaAccordN/A
2012HondaCR-VN/A
2012HondaCR-ZN/A
2012HondaCrosstourN/A
2012HondaOdysseyN/A
2012HondaPilotN/A
2012HondaRidgelineN/A
2012SubaruLegacyN/A
2012SubaruOutbackN/A
2012SubaruTribecaN/A
2011AcuraMDXN/A
2011AcuraRDX2.3LL4N/A
2011AcuraRL3.7LV6N/A
2011AcuraTL3.5LV6N/A
2011AcuraTSXN/A
2011AcuraZDXN/A
2011HondaAccordN/A
2011HondaAccord CrosstourN/A
2011HondaCivicN/A
2011HondaCR-VN/A
2011HondaCR-ZN/A
2011HondaOdysseyN/A
2011HondaPilotN/A
2011HondaRidgelineN/A
2011SubaruLegacyN/A
2011SubaruOutbackN/A
2010AcuraMDXN/A
2010AcuraRDXN/A
2010AcuraRLN/A
2010AcuraTSXN/A
2010AcuraZDXN/A
2010HondaAccordN/A
2010HondaAccord CrosstourN/A
2010HondaCivicN/A
2010HondaCR-VN/A
2010HondaOdysseyN/A
2010HondaPilotN/A
2010HondaRidgelineN/A
2010SubaruLegacyN/A
2010SubaruOutbackN/A
2009AcuraMDXN/A
2009AcuraRDXN/A
2009AcuraRLN/A
2009AcuraTSXN/A
2009HondaAccordN/A
2009HondaCivicN/A
2009HondaCR-VN/A
2009HondaOdysseyN/A
2009HondaPilotN/A
2009HondaRidgelineN/A
2009SubaruForester2.5LH4N/A
2009SubaruImpreza2.5LH4N/A
2009SubaruLegacy2.5LH4N/A
2009SubaruOutback2.5LH4N/A
2008AcuraMDXN/A
2008AcuraRDX2.3LL4N/A
2008AcuraRL3.5LV6N/A
2008AcuraTSXN/A
2008HondaAccordN/A
2008HondaCivicN/A
2008HondaCR-VN/A
2008HondaOdysseyN/A
2008HondaRidgelineN/A
2008SubaruLegacyN/A
2008SubaruOutback2.5LH4N/A
2007AcuraMDXN/A
2007AcuraRDXN/A
2007AcuraRLN/A
2007AcuraTLN/A
2007AcuraTSXN/A
2007HondaAccordN/A
2007HondaCivicN/A
2007HondaCR-VN/A
2007HondaOdysseyN/A
2007HondaRidgelineN/A
2007SubaruLegacy2.5LH4N/A
2007SubaruOutbackN/A
2006AcuraRLN/A
2006AcuraTLN/A
2006AcuraTSXN/A
2006HondaAccordN/A
2006HondaCivicN/A
2006HondaOdysseyN/A
2006HondaRidgelineN/A
2006SubaruBajaN/A
2006SubaruLegacy2.5LH4N/A
2006SubaruOutbackN/A
2005AcuraRLN/A
2005AcuraTLN/A
2005AcuraTSXN/A
2005HondaAccordN/A
2005HondaOdysseyN/A
2005SubaruBajaN/A
2005SubaruLegacy2.5LH4N/A
2005SubaruOutback2.5LH4N/A
2004AcuraTLN/A
2004AcuraTSXN/A
2004HondaAccordN/A
2004SubaruBajaN/A
2004SubaruLegacyAutomaticN/A
2004SubaruOutbackAutomaticN/A
2003HondaAccordN/A
2003SubaruBajaN/A
2003SubaruLegacyAutomaticN/A
2003SubaruOutbackAutomaticN/A
2002SubaruLegacyAutomaticN/A
2002SubaruOutbackAutomaticN/A
2001SubaruLegacyAutomaticN/A
2001SubaruOutbackAutomaticN/A
2000SubaruLegacyAutomaticN/A
2000SubaruOutbackAutomaticN/A

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

1R19122056925-038239792SDAA0156-2218AR6226R6226RAA1756

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.