From what I have heard there is no random button on the 6 disc radio. Several others have complained about it.
I have the single disc one and it does have the button.
2002 WJ Limited, Stone White, 4.7L H.O., Quadra Drive
OME Springs, MX6 Shocks, BFG 265/70R17 All-Terrain, Level 8 Tracker Wheels