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post #1 of 4 (permalink) Old 09-08-2013, 06:36 PM Thread Starter
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Join Date: Aug 2013
Location: CO
Posts: 6
Aftermarket Stereo Install on 2009 with Onstar

I've noticed that there are a couple different wiring harnesses for Cobalts. The ones that allow onstar are quite expensive. I don't use onstar anyway... can I use the cheap ones?

EDIT: or should I just splice into the stock harness? If I end up going this route, does anyone have a wiring diagram for the harness that plugs into the stock radio? I have a 2009 LS

Last edited by jfrosty42; 09-08-2013 at 06:38 PM.
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post #2 of 4 (permalink) Old 09-09-2013, 09:39 AM
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Location: S.W. Pennsylvania
Posts: 455

to keep the chimes/onstar/ect... the best one would be the PAC OS-311
or, you can drop the onstar, keep the chimes with the C2R-GM11

spend $60 and keep the chimes, and have everything wired factory

or spend $100 and keep everything 100%

but NEVER NEVER NEVER chop the factory harness, it's nothing but a headache, and is a bigger headache for the next guy who has to mess with the car

2008 Cobalt LT
SS springs and Stagg struts
Pioneer AVIC-X930BT GPS
Memphis 16-MCH600 "Baby Belle" hybrid amplifier
MB quart Premium 6.5" componant/premium tweeters front
MB quart Premium 5.25 componant/premium tweeters rear
Memphis PR-10" sub in factory sub box

miles and miles of dynamat extreme...

Last edited by jignaczak; 09-09-2013 at 09:41 AM. Reason: wrong information
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post #3 of 4 (permalink) Old 09-16-2013, 12:50 PM Thread Starter
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I'd rather not spend that much on a wiring harness if I don't have to. I have plenty of experience to tap into the factory harness. I don't plan to chop the harness, I just plan to tap into the wires before the clip that goes into the factory radio.

I don't care to keep onstar working for this. Basically, I just need to know what wires are what. So all I really need is 12v constant, 12v switch, ground, illumination, and speaker wires. I found the info on the wire colors, I was just hoping someone can confirm they are correct since I don't have a DMM. Also, it looks like LF+ speaker and RR- are the same color...

Car Radio Battery Constant 12v+ Wire: Red/White
Car Radio Accessory Switched 12v+ Wire: Run a primary wire from the back of your radio to your to the steering column and use the brown wire in the ignition switch harness.
Car Radio Ground Wire: Black/White
Car Radio Illumination Wire: Gray
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Dark Green
Right Front Speaker Positive Wire (+): Light Green/White
Right Front Speaker Negative Wire (-): Light Green
Left Rear Speaker Positive Wire (+): Brown/White
Left Rear Speaker Negative Wire (-): Brown
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Tan
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post #4 of 4 (permalink) Old 09-18-2013, 11:42 AM Thread Starter
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