2008 dodge grand caravan rear defogger

Hi there,

I have a Viper 5601 alarm/remote starter in my van. I have connected a few things to the AUX wires for fun and figured I'd try to connected the rear defogger while I'm at it. The thing is...how do you do it? I have the actual true manufacturer service manuals to help me with anything I'd ever need to do but the rear defogger is on some CAN data bus. The manual describes it as (simplified):

When the rear defogger button is pressed, the AC/heater cluster sends a message on the CAN data bus to the totally integrated power module (fuse box under the hood) to turn on the button's backlite and the rear defogger.

I looked up the color codes for all of the wires connected here and sure enough, it's a data bus wire. So how can this be done? It's not a simple pulse or on/off, it's an actual binary message. Any ideas???

Thanks in advance.

~Jim

I'm looking for the same info for a 2010 Caravan. 2008 should be the same.

Can you email me a copy of the page that has the rear defogger circuit on it.

grannysapplepie@hotmail.com

thanks