Installed a new stereo in my '14 SE. The new HU (Kenwood DNX893S) had a spot for a 3.5mm jack on the back for audio in. Used a Scosche HAAXB and a 3.5mm Stereo to RCA Audio Cable to replace the green connector at the back of the stock '3.5mm Aux In' behind the passenger cubby above the glove box.
1. Drop the glove box. (Consider replacing the Cabin air filter while in there).
2. Reach behind the cubby to remove the green connector from the back of the 'Aux In'.
3. Plug in the Scosche HAAXB in its place.
4. Connect the RCA stereo / 3.5mm cable to the HAAXB.
5. Plug the 3.5mm jack into the rear of your new radio.
6. Connect your mp3 player or other audio source to the 'Aux In'.
7. Enjoy your tunes through the Ridgeline speakers.
I may not use this much as the new HU has Bluetooth, phone screen mirroring etc, but its nice to have an 'Aux In' that works.
https://www.amazon.com/Scosche-Harness-2007-Up-Retains-Factory/dp/B002LT4I5Q
https://www.amazon.com/Cable-Matter...g_2?ie=UTF8&psc=1&refRID=JSKQW8HN0PG5QZ432G79
Pic 1....Back of 'Aux In' in passenger cubby.
Pic 2.... HAAXB and RCA stereo to 3.5mm cable.
http://www.ridgelineownersclub.com/...abin-filter-improve-air-flow-save-bundle.html
1. Drop the glove box. (Consider replacing the Cabin air filter while in there).
2. Reach behind the cubby to remove the green connector from the back of the 'Aux In'.
3. Plug in the Scosche HAAXB in its place.
4. Connect the RCA stereo / 3.5mm cable to the HAAXB.
5. Plug the 3.5mm jack into the rear of your new radio.
6. Connect your mp3 player or other audio source to the 'Aux In'.
7. Enjoy your tunes through the Ridgeline speakers.
I may not use this much as the new HU has Bluetooth, phone screen mirroring etc, but its nice to have an 'Aux In' that works.
https://www.amazon.com/Scosche-Harness-2007-Up-Retains-Factory/dp/B002LT4I5Q
https://www.amazon.com/Cable-Matter...g_2?ie=UTF8&psc=1&refRID=JSKQW8HN0PG5QZ432G79
Pic 1....Back of 'Aux In' in passenger cubby.

Pic 2.... HAAXB and RCA stereo to 3.5mm cable.

http://www.ridgelineownersclub.com/...abin-filter-improve-air-flow-save-bundle.html