05 Suburban Touch Nav

[ikhanton]

I am purchasing a 2005 Suburban K2500 8.1, according to the build it has a Touchscreen NAV system:

UM8 - NAVIGATION RADIO - REPLACES 6-DISC CD PLAYER UQ7 - BOSE SPEAKER

 

SYSTEM

 

U2K - XM SATELLITE RADIO - OVER 130 CHNLS OF DIGITAL ENTERTAINMENT

 

SERVICE FEE EXTRA.1ST 3MOS.INCL U42 - REAR SEAT ENTERTAINMENT SYSTEM

 

My questions are this:

- How does one override the NAV? something about putting a switch on the VSS wire.

- How do I get DVD on the main screen?

- Is there any other considerations I need to concern myself with?

 

Thank you for any help you may have.

 

John