Rostra 250-1775 Aftermarket Cruise hookup - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 12 (permalink) Old 01-08-2008, 06:31 PM Thread Starter
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Thumbs up Rostra 250-1775 Aftermarket Cruise hookup

For those of you who don't have factory cruise, this one is a no brainer to install. 1 hr to install (with lots of double checking voltages with a fluke - I'm a perfectionist). Bought mine on Ebay for $80 bucks (including shipping). Had the dealer reprogram the BCM for $75.

Installation instructions (supplement to those provided with the kit):

1.) Pull the fuse cover off the passenger side of the center console. Pull the cup holder out of the center console by pulling the front part of it toward you and lifting it out. This is where you put the cruise radio receiver after you hook up the wires (below)

2.) Hook the Red and Blue wire together on the supplied harness. Tie them to a single igniton source. I used a simple pair of 18-22 gauge splices I bought at Advance Auto Parts for $1.98. One to splice to the blue wire to the red wire. One more to splice the red wire to the ignition source. The ignition source I used was one of the two pink wires coming out of the big C3 connector in the middle of the Body Control Module = BCM (fuse block). They come out of position D7 in the C3 connector. On a 2007 (and I'd bet all others) this is on the top row, slot 7. From left to right--slot 1=Red/Black [batt + voltage], there is no slot 2 [slot 1 is twice the normal size], slot 3= not used, slot 4= Red/White [batt + voltage], slot 5=D-Green [retained accessory power fuse supply voltage], slot 6=thick pink wire [ignition 1 voltage], slot 7=two thin pink wires [ignition 1 voltage])

3.) Hook the black ground wire from the harness to a bolt that attaches to bare metal inside the center console between the seats. Look around, one isn't too hard to find. I used one that bolts down the BCM on the left (looking straight at it).

4.) Hook the grey wire from the harness up per the instructions with the kit (location 61 of the C2 connector -- next to the white/black wire going into location 62). If the wire doesn't have the 0.64mm microconnector on it (mine didn't), get one from the dealer. GM part #15359541 (dealer charged me $0.75). They'll even crimp it for you if you ask. I fudged it with a pair of needlenose pliers. Just do it clean so it isn't much bigger than the end of the microconnector (it has to fit into the C2 plug).

5.)Thread the supplied wire harness inside the center console from the fuse block to the cupholder hole. Hook the wire harness to the supplied radio receiver. Secure it to the center console inside the hole where the cupholder goes. Put the cupholder back in.

6.) Mount the supplied push buttons to the steering wheel after you put the battery in.

7.) Go to the dealer, fork over $70-$80 for 10 minutes worth of labor and have them reprogram the Body Control Module (BCM) to tell it the cruise control is there.

You're done. Cruise works just like the factory cruise (indication through the instrument cluster). The dealer tech looked dumbfounded when it worked. $160 bucks invested.
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post #2 of 12 (permalink) Old 01-09-2008, 06:03 PM
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Very nice wright up! I'll move this to the DIY section.



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post #3 of 12 (permalink) Old 01-09-2008, 06:45 PM
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Nice write up man....Very detailed...


PS...You cant go wrong with the best........Fluke ;)

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post #4 of 12 (permalink) Old 01-20-2008, 08:08 PM
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can you do this with parts from a donor car? my 08 coupe doesnt have cruise. what all would you need to get? could you get the steering wheel controls and swap it out?



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post #5 of 12 (permalink) Old 01-21-2008, 04:37 AM
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If your car has the steering wheel buttons already then you can, but if you have the plain wheel then you have to pretty much change the steering column as well to get the new contacts.

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post #6 of 12 (permalink) Old 01-21-2008, 05:30 AM
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Nice...I'm really thinkin about puttin cruise on my 'balt...and power door locks so I can get a remote start/keyless entry

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post #7 of 12 (permalink) Old 01-24-2008, 10:48 AM
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I wonder if this would work with a manual transmission...

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post #8 of 12 (permalink) Old 01-24-2008, 03:57 PM Thread Starter
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Yes, it works on a manual transmission. That's what mine has --- no problems.
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post #9 of 12 (permalink) Old 08-14-2008, 10:10 AM
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I did this the other day, and I figured I'd throw in some comments.

1) The plastic panel on the fuse box is hard to get off. There are 3 or 4 clips on the bottom and sides, with prongs on the top. Just pull on the forward bottom corner and it'll come off with enough force.
2) It helps to take off the white plastic border around the fuse panel. There's a bolt you can use for a ground connection that's much easier to get to with it removed.
3) For the digital connection you have to make in C2/J2: push the connector into the hole with straight-down force using a pair of needlenose pliers. It was impossible for me to do with just my fingers.

I got mine for $105 (cheapest I could find) on eBay. Just make sure it's a Rostra 250-1775, it doesn't matter whether it's listed as for the Malibu, Cobalt, G5 or G6 - it works on all of them.

Also, with mine you have to hold the buttons for a second for it to take effect. I thought it wasn't working at first until I found this out.

And also a question: There's one really short orange wire off the harness that they don't tell you to do anything with. Mine had a splice connector on it. Anyone know what it's for? I didn't do anything with it and it seems to work fine.

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post #10 of 12 (permalink) Old 08-18-2008, 04:03 PM
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I searched Ebay and couldnt find this item. Anyone else got a suggestion?
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