is the turbo timer part of the alarm, or a stand-alone?
in my case, i switch the turbo timer on (standalone, was wired up to work with the alarm), take the keys out of the ignition, car continues to idle. get out, close the doors, hold down the lock button on the alarm for 3 secs or so, till it beeps, the doors lock, and thats it. once the turbo timer switches off, the immobilizer kicks in.