Depends on what your trying to do.. I don't think it's really nessesary to run new wire to each speaker because in your case they are all at the monsoon plug and installing a 4ch amp would be a puff. It is more difficult then just running new wires because your looking at a wiring diagram to tell you wiring colors for each speaker on the amp plug instead of your purchased wire so that's up to you. I can post a link of your monsoon's wiring diagram if you'd like it.
Gm0S04 = must be used on 04-08 with monsoon if you want to use the factory amp. It's provides data to turn on the monsoon amp. You will also retain onstar and chime and center speaker. Also has accessory wire for aftermarket unit that functions as RAP. Usually has the vss, reverse and parking brake wire through data for easy install of a double din with nav for example.
Gm0S01 = for non monsoon vehicles. You will retain onstar and chime. Also has accessory wire for aftermarket unit. Usually has the vss, reverse and parking brake wire through data for easy install of a double din nav for example.
No module / without monsoon = must use wire harness Metra 70-2003. You will lose onstar and chime function. Accessory power can easily be tapped into. Right side of dash fuse box has a thick yellow wire that will function as RAP for your aftermarket radio.
No module / with monsoon =
(04 only) use Metra 70-2003 harness no amp bypass needed. Verify this by pulling out the stock radio. Turn ignition on. If you hear the quiet hiss of the amp through your speakers your all set. Accessory power can be tapped into right side of dash fuse box has a thick yellow wire that will act as RAP for your aftermarket radio.
(05-08) must use gmos04 unless bypassing amp at monsoon amp plug. Harness 70-2003 will require the loss of the center speaker unless tied into a left or right front channel. Tweeters will also have to be tied into front channels or aftermarket 6.5" component set recommended. A 4-ch amp can be wired in at the amp plug Instead of just bypassing the amp. Of course new wires can be ran from the radio or amp as well.
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