By design, so nothing is reparable.
The bluetooth/gps unit failed on my 2012 Camry. Radio and everything else worked but the GPS is gone, and I can’t use my phone through the speaker. Took it to the dealer and they said the switches probably failed. They would gladly replace it with a used unity for only $850. Can’t be repaired, only replaced.
Waze does a better job and is up-to-date so I bought a bracket and use my phone. Still ticks me off though.