Car Alarms: 2000 Sierra SLE 4wd vs Astra 7E7, siren sounds, lt blue

Question
After installing the Astra 7E7 alarm, 22 minutes after I arm the system, the siren sounds and the 2-way pager shows a door trigger breach. All the connections are soldered and diode isolated. Any idea what could be causing this?

Answer
"Use tan for the drivers door located in pin B4 of the purple plug, and for the passenger door it will be a orange in pin B2 in the purple plug or dk.blue/white in pin B11 of the lt.blue plug, must diode isolate these wires."

Double check the work. Is it as described above?