2112 chevy sonic,factory remote 4 starter

I use compustar starters and Im try to figure a way for the customer to use his factory remote for starting his car. Any ideas? Or is there a company that makes a add-on?

With the CM6x00 series, here is some info. 

CN3 Pin 14 Pink - Slave/Closed Loop negative (-) input. This is a dual-purpose optional input that can be

changed through Option 4-10.

Default: Slave/Timer Start (-) input. This is most commonly used when adding a remote start to a

factory keyless entry system. You can adjust the number of pulses with Option 2-04.

Optional: Closed Loop (-) input. This wire acts as an instant trigger when separated from ground (-).

It is most commonly used to protect headlights or trailers.

4-10 Trigger Start or Closed Loop System – Default setting sets the pink wire on CN3 as a trigger start

input, which will initiate remote start with a negative (-) trigger. Option 2-04 allows the number ofpulses required to initiate remote start to be changed. Setting 2 changes the wire to a closed loopinput, which makes it an instant alarm trigger when separated from ground - Ideal for protectingtrailers or headlights.                  OPT 1     OPT 24-10 Trigger Start or Closed Loop Alarm Trigger Input      Trigger Start input      Closed Loop System  Input

2-04 Trigger Start – This option changes the number of times required for a negative (-) start input on the

pink wire of connector 3.

          OPT 1     OPT 2                OPT 3        OPT 4

2-04 Trigger Start       Off       Single Pulse     Double Pulse    Triple Pulse

Typically you connect to the drivers lock motor wire (+) and use a relay to convert to a (-) as the input for the

remote starter.  Set for 3 lock pulses and use the Factory Remotes.

Soldering is fun!