WARNING: This page is about a different car, the 2003 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Radio Circuit, 10 Speaker W/O RSE (1 of 2)
Fig 2: Radio Circuit, 10 Speaker W/O RSE (2 of 2)
Fig 3: Radio Circuit, 6 Speaker System
Fig 4: Radio Circuit, W/ Rear Entertainment (1 of 3)
Fig 5: Radio Circuit, W/ Rear Entertainment (2 of 3)
Fig 6: Radio Circuit, W/ Rear Entertainment (3 of 3)