How do I check for error codes?  Do they show up in a typical scanner for the emissions  engine related trouble code, or do I need some other special teader?

do you have the overhead console by the rear view  mirror?

there was just a write up on how to re-solder connections. 

 

check underseat connections.

There is a light thing up top, but nothing else on it I noticed.
The red error light is on the combination meter.  The light for the passenger air bag on / off is center of the dash, at the very top, with the clock, and MPG meter stuff.

Got on & off the passenger seat a few times, the light switched on / off as you would expect, but the error light stayed on the entire time.

Ok.  So when you reconnect the air bag wires, you have to push the little lock thingys all the way in.

Do'h!

wires located where?

The ones in the steering wheel.  On the back of the air bag.