Car android system is restricted

My car android system is restricted and I can't install any app beside what was installed by the company.
I do have access to the system settings and I can restore it to factory defaults.
I did noticed that there is a hidden app installed that control the reverse camera and I think it also controls the call log and the phone.
What will happen if I restore it to factory defaults? Will it still function?

Yes it will still function - why would you want to restore it back to default settings? also what other apps are you trying to install?