Currently performing the DVD bypass mod. It has been suggested to take the ground wiring from the 12volt relay, and combine it with the radio's ground in the vehicle. How do you do this? The provided ground from pioneer has no extra wiring to combine with...

Any help is appreciated....

u needs to join those 2 wires into one wire to ground.

Here is a youtube video that shows you what to do. It is demonstrated on the 4300. This is the same thing I did to bypass it on my 3300bt.