Pioneer AVIC-X9310BT Operation Manual page 252

( Connecting the system
The navigation unit
Wowercord
V
Violettwhite
(REVERSE GEAR SIGNAL INPUT)
Th
is is con nected so that the navigation system can detect
whether the vehicle is moving forwards or backwards.
Connect the violet/white lead to the lead whose voltage
changes when the shift lever is put in reverse. Unless
connected, the sensor may not detect your vehicle traveling
forward/backward properly, and thus the position of your
vehicle detected by the sensor may be misaligned from the
actual position.
a
Note
When you use a rear view camera, please make
sure to connect this lead. Otherwise you cannot
switch to the rear view camera picture.
En
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