Aftermarket Stereo Install on 2009 with Onstar - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 4 (permalink) Old 09-08-2013, 05:36 PM Thread Starter
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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 05:38 PM.
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post #2 of 4 (permalink) Old 09-09-2013, 08:39 AM
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NEVER CUT THE HARNESS

to keep the chimes/onstar/ect... the best one would be the PAC OS-311

http://www.amazon.com/PAC-OS-311-Onstar-Interface-Vehicles/dp/B0015AOI4I/ref=sr_1_1?ie=UTF8&qid=1378741046&sr=8-1&keywords=OS-311
or, you can drop the onstar, keep the chimes with the C2R-GM11

http://www.amazon.com/C2R-GM11-Interface-Integration-Adapter-Vehicles/dp/B000VAOILG/ref=sr_1_1?ie=UTF8&qid=1378741096&sr=8-1&keywords=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

John
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 08:41 AM. Reason: wrong information
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post #3 of 4 (permalink) Old 09-16-2013, 11:50 AM 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, 10:42 AM Thread Starter
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anyone?
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