So i've read through the thread here, but I don't think i'm seeing anything useful.
I've got an '02 4.0 4x4 4D Ranger that's never had the airbags deployed, and never had the RCM replaced, or AFAIK, touched. I'm the second owner, and the first one only did routine/needed maintenance, with records.
I've had some battery issues lately (the DLG started to die; sometimes it would hold a charge, sometimes it wouldn't), and two days ago my AB light came on. I learned here that it flashes a code, so I paid attention and got code 29.
I checked the connections under both seats, and at the key-turn for the PSAB, and I don't see anything wrong/broken/unusual/disconnected.

Any ideas of what to try next?