Pressing the button changes the vehicle-to-vehicle distance as follows:

The vehicle-to-vehicle distance is set automatically to long mode when the engine switch is turned to ignition on mode.
If a vehicle is running ahead of you, the preceding vehicle mark will also be displayed.
Vehicle-to-vehicle distance settings
Select a distance from the table below. Note that the distances shown correspond to a vehicle speed of 50 mph (80 km/h). Vehicle-to-vehicle distance increases/decreases in accordance with vehicle speed.

Adjusting the set speed
Canceling and resuming the speed controlVVT sensor (3MZ-FE)
REPLACEMENT
HINT:
A bolt without a torque specification is shown in the standard bolt chart (see
page 03-2 ).
1. REMOVE AIR CLEANER ASSY
2. REMOVE VVT SENSOR
(a) Disconnect the sensor connector.
(b) Remove the bolt and sensor.
3. INSTALL VVT SENSOR
(a) Apply a light coat of engine oil ...