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Audio/Nav not working after battery change

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My son in law has a 2016 GX460.  Battery died when my daughter was out and about.  she had it jump started then went home and my son in law installed a replacement new Battery.  Now the radio and nav is not working.  at first the ac wasn't working at all also.  we read some on line and this seems to be a common problem with lexus.  We checked all fuses and tried disconnecting the Battery, all hints and tips we could muster.  Now the ac seems to work but still not radio/nav.  camera displays when in reverse.  Any additional info or suggestions would be very welcome and helpful.  Thank you in advance if you can help please.

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