There is an illumination wire which i think is black with a yellow stripe. If you have wired this incorrectly, it would cause the problem you are describing.
Depending on your head unit, it may not need this wire, in which case you need to tape it up so it doesnt short. I know of someone who thought being a black wire, it was a ground, and wired it up to the head unit. There actually isnt any ground wire from the wiring loom, you need to ground your head unit by running a wire to the chassis.