WARNING: This page is about a different car, the 2007 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Cruise Control Circuit, W/ Dynamic Radar Controls (1 of 3)
Fig 2: Cruise Control Circuit, W/ Dynamic Radar Controls (2 of 3)
Fig 3: Cruise Control Circuit, W/ Dynamic Radar Controls (3 of 3)
Fig 4: Cruise Control Circuit, W/O Dynamic Radar Controls (1 of 3)
Fig 5: Cruise Control Circuit, W/O Dynamic Radar Controls (2 of 3)
Fig 6: Cruise Control Circuit, W/O Dynamic Radar Controls (3 of 3)