want to upgrade prius 2012 type 2 HU to OEM type 4 or 5?

If you are going to replace the headunit, why not go aftermarket? You will probably be more satisfied with the results and don't have to worry about JBL. I don't have the upgraded head unit, but there are plenty of posts on how the navigation and sound isn't too good.

 

I agree, aftermarket would be best if you're going to replace what you have. So many choices available. I have the 7" factory system, with no complaints.

 

i have wondered this as well. is it possible for a package 5 with jbl to be upgraded to the HU with nav without any additional wiring or fuss? my current HU has the notorious volume control and tune knob that works occasionally and is very frustrating.

 

this can be done but the problem is the wiring harness is different from jbl and non jbl prius. meaning you will have to cut the wire harness out of the prius with the jbl system. also you'll have to tap the jbl wire harness to your prius. the jbl speakers aren't a problem because a radio can work with technically any speaker. its just wont sound as good as a car with a jbl system.... to sum this up its not worth the time and headache trying to make it work. its much easier buying an aftermarket head unit

 

I have a jbl system already.

 

the JBL system is terrible, poor interface and poor sound quality

 

I guess I don't have a issue with it. It seems to have more than enough bass. The only thing I don't like is when the bass drops and gets boomy the plastics creak.