Manual Cancel Mechanism

WARNING: This page is about a different car, the 2002 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

If any of the following signals are input during cruise control driving, the current to the motor flows in the direction to close the throttle valve, and the cruise control is canceled. Vehicle speed memory will not be erased.

Stop light switch is on (brake pedal is depressed).
On vehicles with automatic transmission, D position circuit in the park/neutral position switch is turned from ON to OFF (shift position is changed from D to N, 2 or 1).
On vehicles with manual transmission, the cruise control clutch switch is on.
The CANCEL switch of the control switch is on.
The CRUISE switch is off (vehicle speed memory will be erased).
On vehicles with automatic transmission, the shift lever in M position and shift range other than D or 3 position.