UPDATE: I ended up biting the bullet and rewired the Front Speaker positive/negative head unit outputs to the Maestro CH3’s Rear Speaker inputs, with the Rear Speaker head unit outputs. So both Front and Rear Head Unit wires together, connected to the single Rear inputs from the CH3 harness. This allowed me to keep the sound quality while fixing the Carplay phone audio issue. I did have to change my gain to 90% in the AV OEM vehicle amp setting to prevent the speakers from peaking out and distorting, however. Things appear to be working great!

ORIGINAL POST: Everything seems to be working flawlessly, expect for ONE thing - I can't hear phone calls when using Carplay (The caller can hear me, but I can't hear them). I've tried audio level adjusting and other troubleshooting. The JVC bluetooth works, but Carplay only works via USB. Has anyone else had this issue?

I found this thread, but want to avoid rewiring and/or risk crippling the car’s sound quality for music (which sounds 100x better than the stock head unit): https://www.reddit.com/r/CarAV/comments/f63ror/wired_carplay_not_using_cars_micspeakers_for/?utm_source=share&utm_medium=ios_app&utm_name=iossmf

Parts:

JVC KW-V850BT: https://www.bestbuy.com/site/jvc-6-8-android-auto-apple-carplay-built-in-bluetooth-in-dash-cd-dvd-dm-receiver-black/6319009.p?skuId=6319009

Maestro ADS-MRR: https://www.amazon.com/dp/B00E4W1644/ref=cm_sw_em_r_mt_dp_.vVmFbQM7Z4MX

Maestro HRN-RR-CH3 Plug and Play T-Harness: https://www.amazon.com/dp/B012F8RC1Y/ref=cm_sw_em_r_mt_dp_EwVmFbJV4VMBW

Electop 2 Pack USB 2.0 A Male to USB B Mini 5 Pin Female Adapter (Stock USB connector is Mini): https://www.amazon.com/dp/B015PGGUWA/ref=cm_sw_em_r_mt_dp_6xVmFbFRQG5KE

SCOSCHE CR1300B 2015-Up Jeep Renegade Double DIN (Had to use mounting clips from stock head unit trim): https://www.amazon.com/dp/B01ET110A4/ref=cm_sw_em_r_mt_dp_xyVmFb0G09YGB

Metra Electronics - Fiat 500... https://www.amazon.com/dp/B07B41Z9R8?ref=ppx_pop_mob_ap_share

Bingfu Universal Vehicle Car... https://www.amazon.com/dp/B07PJX5611?ref=ppx_pop_mob_ap_share

Maestro ADS-MRR Universal Radio... https://www.amazon.com/dp/B00E4W1644?ref=ppx_pop_mob_ap_share

DKMUS Universal ISO Car Radio... https://www.amazon.com/dp/B00ZGCYF0S?ref=ppx_pop_mob_ap_share

JOYING Android 10 Car Stereo with... https://www.amazon.com/dp/B08YRMKFFQ?ref=ppx_pop_mob_ap_share

I would suggest following the linked guide with a few changes / notes below : https://www.fiat500owners.com/threads/how-to-2012-fiat-500-double-din-radio-install.7412/

1. The double din dash adapter seems a bit iffy from the Amazon reviews, YMMV: https://www.amazon.com/Scosche-FT4276B-Double-Select-Vehicles/dp/B00RL9L9F8/ref=sr_1_1?keywords=FT4276B&qid=1573525758&sr=8-1
2. Antenna Adapter on Amazon for ~10 bucks: https://www.amazon.com/gp/product/B07DWLTP6R/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1
3. For the headunit I'm assuming you'd want bluetooth and Android Auto / Apple Carplay? I would highly suggest the Kenwood DMX706S : https://www.amazon.com/gp/product/B07SMBMQ5Z/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1
4. To use the head unit after install without actually splicing your parking brake and other cables, get the Kenwood bypass cable: https://www.amazon.com/gp/product/B01FY8P9QC/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1
5. To tie all this together, you'll need the wiring harness. I suggest idatamaestro:https://www.amazon.com/gp/product/B00E4W1644/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1 https://www.amazon.com/gp/product/B012F8RC1Y/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1 You will make an account and flash the firmware to the appropriate car make/year and head unit model.

I've only installed a basic 1 DIN stereo on my old 2013 500. I suggested the above head unit and wiring harness because I've installed that on my 2017 500 and had great results. Best of luck.

I actually just got it installed yesterday and is working great so far! I had to get a few parts on top of just the Kenwood unit to retain full functionality of the steering wheel buttons and everything else, which is why it took a month for me to actually get it installed, but now I have android auto and I am able to see a lot more system information like tire pressure and other data points. Here are all of the parts that I needed to makes this work with full functionality:

The main head unit is the Kenwood Excelon DMX905S

• Maestro ADS-MRR Radio Interface
• Maestro HRN-RR-TO2 Harness
• AX-TOYUSB - USB-Auxilliary Retention Harness
• TOYK952GB Dash Kit
• Metra 40-LX11 Antenna Adapter