2005 Envoy compustar 2way a/s

don't know if this posted so I will try again.

Glad you found the mod you need. you also could have used DEI part # 457gw "combo" interface which does everything thru the data.

If not using a mod the system is not really "positive" in the front. You would need to go directly to the doorlock motor wires for the front doors AND rear hatch. 5 wire relay setup, pretty basic.

The rear doors it seems you can catch at the relays under the seat, negative output, must diode isolate, also basic.

But seems you found a mod that will work as well so best of luck,

let us know how it works and post if you need any more assistance.