Circuit Description
WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
Receiving the signal of the turn signal switch from the Driver side J/B ECU, the Drier side J/B ECU makes the turn signal light come on.
Drive Side J/B ECU activates the flasher relay while the theft deterrent system gives the warning and lights the turn signal light and the hazard warning light.