Here's my write up for those that are interested. I installed this on my 2008 Saturn Sky Redline w/ Automatic transmission.
I installed the iDatastart CMHCXA0 module along with the iDatastart ADS-THR-GM2 T-harness cable. Since the module is designed to fit many cars from many brands it does require some software updates. To update the software you'll need to setup an account and download the Weblink installer from
iDatalink - CMHCXA0 . To find both tap on the "flash your module" hyperlink in the top right corner. Follow the prompts to setup an account and then you'll be directed to download the installer and you will also need to run internet explorer and a windows computer to do so. After connecting your module via the USB cable to your computer. Follow the prompts and select your vehicle from the drop down list. You will also be able to select how you would like to have the remote start work. e.g. "lock, lock, lock or lock, unlock, lock," using either your factory OEM key fobs or iDatastart's sold separately extended range key fobs. After flashing the module the module is ready for install.
Note: I'm not sure if this unit will work on a manual transmission or not, but the instructions do instruct you to cut a wire loop on the side of the module if using on an automatic vehicle. I'm not sure why this would be necessary if it only worked on autos so feel free to contact Crutchfield as they should be able to explain.
The iDatastart ADS-THR-GM2 T-harness cable is designed for multiple GM vehicles so you will have some extra wiring you will not need for this install. Below is what the harness will look like. You will end up using the harness marked MS1/MS2. On the opposite side of the harness you will find VS1/VS2.
Unplug the car's green connection from the ignition and plug it into VS1 and VS2 will replace the connection you unplugged.
You will now connect the JS2 harness to the JS1 connection on the other pigtail on the MS1/MS2 harness. The JS2 harness will have VS3 and VS4 on the opposite side.
You will unplug the car's black connection from under the ignition and plug it into VS3 and then plug VS4 into the connection you unplugged. Below is all 4 connections.
You will have a few other pigtails in the harness box, you can discard the others labeled with another JS number as they are for other models of GM vehicles. You will be left with 2 pigtails the one with with he black connection will have 11 colored wires coming from it.
Use this pigtail to run to the BCM. The good news is you will only need 2 of the wires as I believe all Sky's came with keyless entry. The bad news is the wires will not be long enough and you will need to connect some additional wire lengths to reach. You will connect the white w/ black dot wire to pin 5 (brown/white wire) from the the BCM harness on the right side (I used a black wire as my extension). This controls the parking lights to be active while the remote start is active. There is also an option to disable this during flashing if you prefer not to have this feature. Next you will connect the purple/black w/ black dot wire to pin 22 (gray/black wire) to the harness on the top of the BCM (I used a blue wire as my extension). This is for the driver's door pin switch so that if you turn off the remote start with the fob that it will also disable the RAP feature so that the radio and other accessory power will turn off same as opening the door.
The instructions also ask to connect the white/black w/ black dot wire to the horn. I did not do this and I'm not sure why I would need to. Feel free to do so if you wish. Finally there is also a pigtail with a white connection that is used to connect the included hood switch. At the moment I have not yet installed the hood switch, not having it installed does not effect the use of the remote start. However, it is a safety feature to ensure that someone doesn't remote start the vehicle while the hood is open potentially injuring someone or damaging anything.
Follow up by plugging in the harness into the module, they are color coded and also different in size so you shouldn't need to worry about this part. After everything is plugged in you should see the module blink red. The next steps are to have the module learn your car:
-Close then reopen drivers door to wake up the BCM in case it timed out during install.
-Insert key into ignition, wait 3 seconds.
-Turn key to ACC, wait 3 seconds.
-Turn key to on, wait 3 seconds.
-Turn key to start, hold 3 seconds.
-Release key, wait 3 seconds.
-Turn key off, wait 3 seconds.
-Wait for the LED to turn green for 2 seconds
-Start vehicle, hold for 15 seconds
-Press brake pedal and hold
-Press and release the programming button on the module
-Release brake pedal
-Wait, LED will flash green
Module is now programmed.
The takeover procedure after remote starting is as follows.
-Press unlock on the OEM fob
-DO NOT PRESS BRAKE, turn key to on position, wait 2 seconds
-Press and release brake
Takeover complete and proceed driving as usual.
This system works with the OEM key fobs, but you can also buy iDatastart key fobs if you wish they have farther range and will also replace your factory ones if you need to replace them anyway. Personally I like this system for the fact I can use the OEM key fobs. You can also cancel the remote start by pressing the same sequence you programmed for your remote start. So far so good and everything is working as it should.