How do I find the tech specs for my stereo/nav unit?

try the new car features booklet at techinfo.toyota.com, or try the wiki page here for other sources

 

New Car Features (more info) has some basic information, but not the answer to this question.

To determine the part number of the Navigation Receiver Assembly, look for its ID number, marked on the lower left or lower right corner of the faceplate, and match this with an ID number (shown with “ID=” in the parts listings) in parts catalog Figure 86-03, Navigation & Front Monitor Display, or Figure 86-01, Radio Receiver & Amplifier & Condenser.

For example, if the ID number is E7022, it’s the unit made by Denso, Toyota part number 86120-47390. I don’t know of any firmware upgrades for that model, just the hardware replacements described in Toyota service bulletins T-SB-0054-10, “Static-Laden/Distorted Bluetooth Sound Quality” (PDF) and T-SB-0207-10, “Poor FM Radio Reception” (PDF).

 

My, OEM style, Advent HU just bit the dust.

I had to decide between:

1. buying a major brand and living with a generic double DIN look (without the buttons on the side) and having to using a steering wheel control adapter and JBL amp interface. The reasonably priced units have car play and android play but don't have built in navigation. Probably not an issue most of the time.
   
2. buying a Prius specific model from China.

A company called Klyde manufactures the units which get reasonably good reviews. They are the company which manufactures Pumpkin units. The newer, slightly more expensive units, come with Android 9, included DSP and (I think) a better screen.

I have one on order. I'll start a thread after I install it, probably not until mid December. I bought the canbus adapter, reseller is including a plug n play cable.

Some things I learned. It can be cheaper to skip free shipping and pay extra. Shipping charges vary, some offer expedited shipping others use slower methods. The reseller I'm using asked me to send a picture of the back of my factory radio. They vary, JBL models don't all use the same cables. I also sent a picture of the connector on my GPS antenna.

Car Play and Android Auto are available via a USB dongle, around $40-$50. You can also get either Car Play or Android Auto installed in the actual unit for around $20-$30. I decided the external adapter gave me better options if compatibility issues arrived. Plus I use an Android phone and my wife an iPhone.