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Discussion Starter #1
Hey guys!
Finally got my double din head unit installed on my 2009 cobalt coupe. This is my first full DIY so enjoy and hope it's detailed enough for you all!

Step 1:Remove dash trim until stock radio is as shown:


For full steps on removing dash trim refer to other DIY (how to:remove dash trim).
Now you will see 4 bolts around stock radio. Remove with wrench set. I believe it is no.6 or 7 metric.


Next step after removing 4 bolts is to pull back the stock radio, exposing the wiring behind it. The wiring connections behind the stock unit should look as shown:


Unplug the two harnesses from the radio as well as the antenna cord. This may take a bit of force, as it is tight. Here is the wires you are left with after removing the stock unit:


Now, to do this install, I used the PAC brand CR2-GM11 interface, which I bough from crutchfield, Canada. At first i got an older version, and when i plugged it in it did not work. They shipped me the new one, and it looked like this:


First, i connected the interface to the harnesses as shown to test it:


Here is a short video on how to test the interface before wiring it up, to make sure it works. May save you a lot of time if your unit is defective like mine was:

Now that you know your harness/interface is working, you have to wire it up to the head unit. My head unit is a double din clarion (max385VD). Here is how I proceeded with the wiring:






Here is the connections between interphace harness and head unit wiring for all four speakers:


Now, the CR2-GM11 comes with a red accessory wire, which connects to the head unit in order to give it the capability of working like your factory unit and staying on when the car is off until you open your door etc. It is easier than going to get the accessory from the fuse box to turn on the head unit. The wire is max 1 amp, however, and in fear of damagin the new interface, i followed the instructions and put a relay on the interface's accessory wire and then connected the head unit's accessory to the relay, I went and got the relay's main power from a fuse in the fuse box (20a I believe) and it works like a charm. The interface has instructions on how to put a relay if you think your unit will need more than 1amp accessory. If it doesn't, just connect red with red on the harness and you<re done this step. Heres a pic of the relay i installed;


Now that the head unit is all wired up to the interface, I tested it before reinstalling it. Here is a short video on testing my head unit to make sure it works how you want it:


Now that you have tested it and it works, re-install it into the dash by putting back the 4 screws and the dash trim. I had to really play with the wiring in back of the unit to get it to fit, as there is not much room in back of the head unit when you put it in. There is also a small silver tab at the back of the head unit that I bent slightly in order to have more room to install the head unit. I also put the wiring harness and the cords tucked underneath the head unit, because there is more room there.

Finally, the finished product:










Hope you liked the writeup and it comes in handy! PM me if you have any other questions or comments!
 

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Discussion Starter #3
Awesome thx. hey wat does a guy gotta do to become a moderator around here? :p

oh,m and im thinkin of changing the gauge/control lighting to blue to match the head unit a bit better. What do you guys think? im guessing the sharpie mod would work for that?
 

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Discussion Starter #5 (Edited)
Would i have to worry about hooking up that red wire if i didnt care if the radio stayed on till i open the door? will it mess anything up if i dont hook it up? thanks
why would you not want to hook it up to the red wire? if you don't hook up the red wire, you have to hook the red wire from the head unit into a fuse in the fuse box or something. if you do not hook up the red wire from the head unit at all, the head unit will not turn on. the easiest thing to do is to connect the red wire from the head unit to the red wire from the harness, as I have shown. Only difference is I put a relay between mine.
 

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is this the only way to install a head unit??? i was thinking about getting one...eventually...but with my luck the connections would come undone in the dash all the time.
 

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Discussion Starter #7
is this the only way to install a head unit??? i was thinking about getting one...eventually...but with my luck the connections would come undone in the dash all the time.
Whan connections would come undone in the dash? if you're talking about the head unit wires connection to the wiring harness, then no, they will not come undone. This is the way you wire them; You first strip the tips of both wires, twist them together, soder them(an option-will give you better electrical transfer and rigidity of connection), and then finally, as seen in the picture, you use electrical tape and cover the whole connection so there is no exposed wire left. You do this for each wire. i have never heard of some other way, and i have done quite a few installs. I learned from some good people too. I don,t know if this is what you are referring to or not.
 

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yeah my soldering sucks...i think it is called a "cold" solder or something like that, happens to me everytime...
 

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Discussion Starter #9 (Edited)
yeah my soldering sucks...i think it is called a "cold" solder or something like that, happens to me everytime...
so? don't solder them, I just wrapped them up together and taped them up, and so did the guy from duro auto who installed my system when insurance paid to have it replaced (i found out when taking it out of my old car). Never heard of any connections coming undone when they're wrapped together and taped. Takes barely any skill to wrap the two wire ends together properly then tape them up firmly. If you want also, after you wrap and tape them, put a blowdryer to the connection so the electrical tape shrinks a bit, kinda like shrink wrap tubing (which you could also use on your connections and that will work REALLY well, but it's more expensive to buy)
 

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I just might get mine put in professionally when I buy it. I hate hooking up headunits,lol. This is a good write up though.
 

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Discussion Starter #12
I just might get mine put in professionally when I buy it. I hate hooking up headunits,lol. This is a good write up though.
thanx. i love doing audio. Takes long cuz i"m a perfectionist, but I still looove doing it, and i find it easy, but i think that,s just cuz I understand these kind of things really well so in reality it's probably not that easy lol. No shame on getting it professionally installed, but in case ppl wanna save some money, they can just use my writeup as a guide.
 

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Well I've thought about just doing it myself because I don't think Best Buy will ever be able to get me in for an install,lol. Would the install be any different if I have the Pioneer sound package installed? I know I'd need to get another hook up to keep my steering wheel controls too...Just seems like alot of work....and wires,lol
 

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Discussion Starter #16
Well I've thought about just doing it myself because I don't think Best Buy will ever be able to get me in for an install,lol. Would the install be any different if I have the Pioneer sound package installed? I know I'd need to get another hook up to keep my steering wheel controls too...Just seems like alot of work....and wires,lol
If you have pioneer system and/or onstar, the harness will be very similar but a bit different. Go to crutchfield and put your car in and put the 'with pioneer system' option in and pick any head unit and it will show you what wiring harness you need. I bought it from them directly because the first time they sent it, it was broken and didn't work. They sent me a new one right away, and I sent the old one back after, and they pay for shipping back and everything. So i'm happy I bought it from them!
 

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Discussion Starter #18 (Edited)
so Bboy, I wired everything up, and it works fine... when the car is off.. lol when I turn it on it doesnt work.
whaaaat? did you wire the 12volt constant power to the harness (yellow to yellow) and the red accessory wire from the radio to the red wire on the harness?

and do you have the PAC harness? ill get back @ u when u answer 2morrow. Me tired.
 

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