WARNING: This page is about a different car, the 2002 Toyota Avalon and 2001 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Transaxle Electronic Control System Wiring Diagram (2001 Avalon - 1 Of 2)
Fig 2: Transaxle Electronic Control System Wiring Diagram (2001 Avalon - 2 Of 2)
Fig 3: Transaxle Electronic Control System Wiring Diagram (2002 Avalon - 1 Of 2)
Fig 4: Transaxle Electronic Control System Wiring Diagram (2002 Avalon - 2 Of 2)