2007 chevy cobalt remote start

Hello, I am trying to install a remote start/alarm/keyless entry on a 2007 Chevy Cobalt LS, 4 door. I was able to install everything without a problem except the remote start. I am using the key in the box bypass (556U) with ICBM 7071 remote start. If anyone has a few minutes to share the relay and resister diagram with me for this car I would be for ever greatfull! And do I have to do the accessory drop out circuit along with resister & relay? Thank you in andvance..

Here is the Passlock2 diagram  :  http://documents.audiovox.com/700122.pdf

Not familiar with the R/S unit you are using but most quality brands do drop the Accessory output when the Starter output goes positive.

Soldering is fun!

Thank you for for posting that diagram. The 2007 Cobalt uses the passkey 3 system. Do you know if this diagram would work on passkey 3? I know the diagram shows a 4 wire ignition, but mine has a 5 wire ignition. Thank you again for your help

Ooopps, sorry.  They did change to all PK3+ in 2007.  Here is a link to the DEI Tech Tip 1606  :  https://www.the12volt.com/installbay/file.asp?ID=528     ( I usually use an iDatalink bypass module on PK3+ vehicles for the extra features, never tried it this way. )

Here is a link to the DEI wire guide :  http://www.readyremote.com/main.asp?make=Chevrolet&model=Cobalt

Here is another link to some good info on the Cobalt  :  https://www.the12volt.com/installbay/file.asp?ID=717   It's listed as covering the 2005 - 2007 models but it shows the 2005 model.

Soldering is fun!

for what its worth, just get a data bypass and you wont have to worry about failed remote start attempts.Ted

2nd Year Tier 1 Medical School

Still installing as a hobby...pays for groceries

Compustar Expert

I know there are a lot easiers ways to do this. This is the first key in the box unit i have ever tried to install. The 556u will most likly be replaced by PKUCG2X after I am sure i know how to use the key in box. Thank you again kreg357 for taking the time to help other people!

If you get an un-cut PK3 Circle + key you can leave it un-cut and program it with a remote start at the proper time.  A little safer that way.  There are a number of vehicles that the "key in the box" is the only way to do it.

Soldering is fun!

A lot of diagrams show to use the correct resister on the WHITE/ black wire, but the one of 556u does not show to use a resister. Does the antenna loop provide the resister value from the key? And thank you for confirming that I don't have to have the new key cut. I was wondering if blank key could be programmed to the car through the antenna loop.

The DEI 556UW will only bypass the transponder ( PK3 ) portion of the immobilizer.  It will not bypass the Passlock2 ( resistor ) part of the system. Soldering is fun!

So basically the Ion/Cobalt diagram you linked in your first reply would have been the right one to use? The relay in the 556u diagram is the same as one of the relays in the Ion/Cobalt diagram with the exception on 3rd ignition (-) which I would think would serve the same purpose as (-) when remote start wire? And the other relay looks like it should work as well. Thanks for answering all my noob questions. Tons of help!