6th Gen ('00-'05): Need a bit of help figure out the wiring for the stereo

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02-27-2019, 06:34 PM

Jebb

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Join Date: Feb 2019

Posts: 1

Need a bit of help figure out the wiring for the stereo

I have an 03 Monte Carlo LS im trying to put an aftermarket head unit in and I have found the wiring diagram for it but I cant figure out what the second plug is for it only has two wires coming from it and they aren't listed on the wiring diagram I have.

Last edited by Jebb; 02-27-2019 at 06:35 PM. Reason: Fixing a word so it doesn't cause confusion

02-28-2019, 06:42 PM

The_Maniac

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Monte Of The Month -- September 2014

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The factory radio has the antenna wire, a large rectangular plug (which is the main one) and then smaller plug (almost square). That smaller one handles wiring for OnStar and/or XM to the factory radio. You should not need to worry about that last plug.