I was wondering if anyone knows how to correct this.I have a 2013 Hardtop no audio upgrade. I can plug in my phone and listen to music. When using Google MAPs the volume is so low that I can barely hear it. I have the phone turned up all the way and the app volume all the way up. I have it on AUX Mode and usually playing music from my phone as well. Any suggestions would be appreciated.
Thanks

 

You may have already found the answer but here it is anyway:

In the Settings app, go to Maps > Driving & Navigation > Navigation Voice Volume

As you change the settings, a description shows up below to explain what the setting does.