06 grand cherokee heated seats

I'm putting a remote start in a 06 grand cherokee srt-8 and the customer requested that I add the heated seats function to the aux channel of the remote.  The alarm is branded Carroll Shelby, and it's a nice unit but I'm sure it's jsut rebranded, not sure who really made it.   but my question is really about how to interface the heated seats. 

I'm not familiar with this particular request but the only information I've found on the seat switches is this, from wjjeeps.com

"The two, three-position rocker-type switches, one switch for each front seat, provide a resistor multiplexed signal to the Body Control Module (BCM) through separate hard wired circuits.  Each switch has an Off, Low, and High position so that both the driver and the front seat passenger can select a preferred seat heating mode."

The custom isn't going to care if he can control the level of the heat, just that it turns on.  how would this be done?

If you did it by the AUX channel (-) output, you'd have to utilize a relay with the appropriate resistance, which I'm sure what resistance that is for each of the settings.