with the airbag system you have to insert a wire in to a plug and count the flash codes it can't be read on the select monitor.
you can do it yourself but if you get the wire in the wrong hole...........!!!
also one code can relate to several things i.e code 45 could be drivers side airbag, drivers wiring loom or ecu which is why we have to use the test harnesses to eliminate various parts so we isolate it to just one part.
it can take a while i'll admit and i'm sure they could make it a lot easier to diagnose, what model year is it?