I’m experiencing an issue with the navigation system on my 2014 Lexus IS250. Yesterday, everything was working fine, but the radio suddenly crashed. Now, after the initial Lexus logo boot-up, the system gets stuck on the “Continue” screen. The joystick will not select the “Continue” option, and the system enters a constant restart loop. It stays on the Continue screen for about one minute, then shuts down and boots back up again. No issues with backup camera

I also noticed today that the air conditioning is no longer blowing cold air. This may be an isolated issue, but I find it odd that both problems started at the same time. The AC controls respond normally, but there is no airflow coming from the vents.

I scanned for error codes and found the following:

• Navigation system: B15D0, B12D3
• AC system: B1453, B1455

Based on what I’ve found, these codes point to a potential issue with the MOST (Media Oriented Systems Transport)

I performed a navigation system reset by disconnecting the battery for 30 minutes to allow the system to reinitialize, but the issue persists. I also attempted to access the navigation diagnostic menu, but was unsuccessful.

I inspected the amplifier and found no signs of water damage or corrosion. I also tested the radio with the amplifier unplugged, but the system behaved the same way.

Replace radio? Amp?
Any insight or guidance would be greatly appreciated,
Thanks