rottisnot

I recently obtained an 01 RX and it has pretty much been a nightmare for the last month chasing gremlins. Thanks to CL, I replaced the dead factory navigation system components with OE and upgraded the the drive unit to a Gen 4 from an 06 GX. All is working now! Because I like to press my luck, I was curious what the 2 unused connections do on the nav unit when upgrading from Gen 2 to Gen 4, like what are they for and can you add any capabilities to the system by plugging in parts. Thanks!