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 controlParking brake cable ASSY NO.1
COMPONENTS
REPLACEMENT
1. PRECAUTION (W/ SIDE AIRBAG) (SEE PAGE 60-1 )
2. DISCONNECT BATTERY NEGATIVE TERMINAL (SEE PAGE 60-1 )
3. REMOVE INSTRUMENT PANEL FINISH PANEL SUB-ASSY LOWER (SEE PAGE 71-10 )
4. REMOVE INSTRUMENT PNL INSERT SUB-ASSY LWR LH (SEE PAGE 71-10 )
5. REMOVE INSTRUMENT CL ...