JVC KD-LX3R Manuel D'instructions page 21

Controlling the volume automatically (Audio Cruise)
You can select the proper cruise mode for your car.
This unit change the volume level automatically (at 3 possible levels) based on the driving
speed of your car by detecting the alternator's generating frequency (Audio Cruise).
If you want to use this mode, follow the procedures below. When shipped from the factory, this
mode is set to "CRUISE OFF."
• CRUISE 1: Select this if your car is relatively quiet.
• CRUISE 2: Select this if your car is relatively loud.
The volume increase rate is twice as much as that of the CRUISE 1
setting.
• CRUISE OFF: Cancels Audio Cruise.
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Press and hold SEL (Select) for more than 2 seconds
so that one of the PSM items appears on the display.
Select "CRUISE MODE."
Select desired setting.
Each time you press the button, the Audio Cruise mode changes as
follows:
CRUISE 1
Finish the setting.
CRUISE 2
CRUISE OFF
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