the 'paddles' on the back of the steering wheel are in fact for the stereo. the right side controls the volume and the left controls the tuner presents/search and cd track if equipped with a cd player.
if you have a 5.9 and no cd player my initial thoughts are that the 'paddles' don't work because the stereo unit is not the factory unit.....just a thought....
1996 Grand Cherokee Limited 4x4
Fully Loaded, Black, 5.2L V8
K&N with 'high-flow' exhaust....sounds better than a 5.9