WARNING: This page is about a different car, the 2004 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Cruise Control Circuit, W/ Dynamic Laser Controls (1 of 2)
Fig 2: Cruise Control Circuit, W/ Dynamic Laser Controls (2 of 2)
Fig 3: Cruise Control Circuit, W/O Dynamic Laser Controls (1 of 2)
Fig 4: Cruise Control Circuit, W/O Dynamic Laser Controls (2 of 2)