Wiper Signal Circuit: Description
WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.
The distance control ECU detects HI mode wiper operation. If the windshield wiper operate in HI mode for 5 seconds or more, the cruise control will be cancelled and "CRUISE NOT AVAILABLE" will be displayed on the multi-information display in the combination meter. Operating the cruise main switch after HI mode wiper operation stop sill start the cruise control again.