Cruise Control Switch Circuit [08/2013 - ]: Description

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

The cruise control switch is used to turn the cruise control system on and off, as well as operate 8 functions: SET, -(COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP, CANCEL, and MODE. The SET, TAP-DOWN, and - (COAST) functions, and the RES (RESUME), TAP-UP, and + (ACCEL) functions are operated with the same switch. The cruise control switch is an automatic return type switch which turns on only while it is being operated in the direction of each arrow and turns off after being released. The internal contact points of the cruise control switch turn on with switch operation. The driving support ECU assembly then reads the voltage value that has been changed by the switch operation to control MODE, SET, -, RES, +, or CANCEL function. The dynamic radar cruise control system has two cruise control modes: constant speed control mode and vehicle-to-vehicle distance control mode.

Vehicle-to-vehicle distance control mode is selected by default when the dynamic radar cruise control system is turned on using the cruise control switch (ON-OFF button).
The operation of constant speed control mode is the same as that for a conventional cruise control system.