Need help with abbreviation expansion in Toyota Wiring Diagram.

Back up videocamera has 4 pins:

1) CV-
2) CV+
3) CGND
4) CB+

What pin is for the video signal and what for the power supply (CV+ or CB+)?

 

Educated guess... CV + or - would be signal. CB+ & CGND would be to power source and source ground.

 

The problem is that I installed a rear view camera on IS250 (all parts are original, made by toyota), but when it is cold outside I have some linear distortions on the camera picture until the car warms up.

May be I need to ground the CV- wire somewhere near the camera? By the default it is grounded only in the monitor.