head unit

[reDONKulus]

ok so Ibought a cd player for my truck it came out of a 03 silverado its just a stock single disc player, but it beats am fm radio and I dont have the 2000 for the in dash nav dvd. so anyway i unplugged mine and went to plug the new one in and found the cd player has an extra harness connector slot that mine didnt have. is this because it came out of a crew cab truck?? for the extra speakers that the crew cab has? or is there something more that I am missing?
any help would be appreciated!

[84fiero123]

Some of the cd units were tag along units that plug into the original radios and the CD unit is an accessory to the radio. At least it was that way in my year Burb.

[reDONKulus]

well I went into the GM dealer today and they told me that since the truck that this head unit came out of had steering wheel controls and mine doesnt that the 2 were not compatible.