[Flofocus]

Put the old one back in make, sure it is plugged in properly. Who knows, maybe they overlooked something that simple....

PCM is by the passengers side foot well. putting it back in, making sure it is plugged properly shouldn't be too hard, even for a newb.

I'd also check the wires harnesses in the door jambs, especially your hatch/trunk though i can't recall wagon owners having the same issue as hatch owners. it should be obvious - mine was - the wires were cracked, some were already severed. Caused issues with my headlights, cruise control, signals, alarm...it was a mess....