Description
Metra 40-HD21 Reverse Antenna Adapter for Select Acura and Honda Factory Radios
The Metra 40-HD21 lets a matching aftermarket antenna connect to the original radio in selected Acura and Honda vehicles. Its female Motorola socket and male Honda-style plug adapt the antenna connection, while a separate blue lead connects to the factory radio antenna turn-on wire.
Connection Features
- Keep the original Acura or Honda radio when connecting a compatible aftermarket antenna.
- The female Motorola socket receives the replacement antenna plug.
- A male Honda-style connector supplies the matching factory-radio connection.
- The separate blue lead provides the antenna turn-on connection described by Metra.
- Includes selected 2009-2024 applications, with individual model years identified in the detailed compatibility list.
Technical Specifications
| Model | 40-HD21 |
|---|---|
| Purpose | Aftermarket antenna to factory radio |
| Antenna connector | Female Motorola |
| Factory connector | Male Honda style |
| Wire lead | Blue antenna turn-on |
Vehicle Applications
- 2013-2018 Acura ILX
- 2009-2014 Acura TL
- 2013-2019 Honda Accord
- 2012-2024 Honda Civic
- 2010-2022 Honda CR-V
- 2011-2016 Honda CR-Z
- 2013-2015 Honda Crosstour
- 2009-2019 Honda Fit
- 2016-2022 Honda HR-V
- 2010-2019 Honda Insight
- 2011-2020 Honda Odyssey
- 2019-2020 Honda Passport
- 2012-2021 Honda Pilot
- 2017-2019 Honda Ridgeline
Installation Notes
Attach the blue lead to the factory radio antenna turn-on wire. Confirm model-specific fitment and the original connector before ordering.
Configuration and Connection Notes
- For 2016 Honda Civic coupe/sedan LX or LX-P with factory navigation, use 40-HD23 instead.
- For 2017 Honda Ridgeline with factory navigation, use 40-HD23 instead.
Vehicle Configuration Notes
- Acura TL 2009–2014: without factory navigation.
- Honda Accord 2013–2017: LX or LX-S.
- Honda Civic coupe/sedan 2016–2021: LX or LX-P. Hatchback 2016–2021: LX or LX-P; hatchback Sport is specified for 2017–2018 only. Apply the separate 2016 navigation alternate-adapter note.
- Honda Civic 2014–2015: LX, EX, EX-L or Si.
- Honda CR-V 2010–2011: with factory navigation. CR-V 2017–2022: LX.
- Honda CR-Z 2011–2016: without factory navigation.
- Honda Crosstour 2013–2015, Fit 2009–2013 and Insight 2010–2014: with factory navigation.
- Honda Odyssey 2014–2017: LX.
- Honda Pilot 2016–2021: LX without a touchscreen and without factory navigation.
- Honda Ridgeline 2017–2019: without a touchscreen and without factory navigation; apply the separate 2017 navigation alternate-adapter note.