Touch Panel Switch does not Function

WARNING: This page is about a different car, the 2006 Toyota Camry Solara. However, it is still accessible from the selected car via links, so may be relevant.

CHECK TOUCH PANEL
1. Check for foreign matter on the display.
  OK: The display is clean.
NG: CLEAN DISPLAY AND RECHECK TOUCH PANEL

OK: GO TO NEXT STEP
CHECK TOUCH SWITCH (DISPLAY CHECK MODE)
1. Enter the "Display Check" mode (Touch Switch Check) (See DISPLAY CHECK MODE ).
2. Touch the display in the area where the switch malfunction occurs.
  OK: A "+" mark appears at the touched position.
NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

Fig 1: Display Check Mode (Touch Switch Check) Screen
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE RADIO AND NAVIGATION ASSEMBLY