Pioneer AVIC-8000NEX Installation Manual page 11

Connection
Violet/white (REVERSE-GEAR SIGNAL INPUT)
This is connected so that this product 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.
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.
This product
Power cord
Power supply
En
Section
02
11