Navigation cannot control audio system

WARNING: This page is about a different car, the 2005 Acura TSX and 2004 Acura TSX. However, it is still accessible from the selected car via links, so may be relevant.

Make sure the anti-theft code for the audio system is entered.
Go into the diagnostic menu and use the "Navi System Link" test (see NAVI SYSTEM LINK ).
Is the "Radio" icon red?

YES -Do the troubleshooting for the voice guidance cannot be heard (see VOICE GUIDANCE CANNOT BE HEARD, IS BROKEN UP, OR THERE IS STATIC ).

NO -Go to step 3.
Substitute a known-good navigation unit (see NAVIGATION UNIT REMOVAL/INSTALLATION ), and recheck.
Can the navigation control audio/CD?

YES -Replace the original navigation unit (see NAVIGATION UNIT REMOVAL/INSTALLATION ).

NO -Do the audio system troubleshooting.