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 controlRear speaker ASSY
REPLACEMENT
HINT:
COMPONENTS: See page 75-13
Installation is in the reverse order of removal.
1. REMOVE DOOR PULL HANDLE (SEE PAGE 75-13 )
2. REMOVE REAR DOOR TRIM BOARD SUB-ASSY LH (SEE PAGE 75-13 )
3. REMOVE REAR DOOR INSIDE HANDLE SUB-ASSY LH (SEE PAGE 75-13 )
4. REMOVE REAR DOOR SER ...