Sony CDX-GT470UM Manual

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Warning if your car’s ignition has no 
ACC position
Be sure to set the Auto Off function 
(page 15). The unit will shut off 
completely and automatically in the set 
time after the unit is turned off, which 
prevents battery drain. If you do not set 
the Auto Off function, press and hold 
 until the display 
disappears each time you turn the 
ignition off.