Yes, the car is in working order. The SRS light just came on when startling it.

The steering cable (clockspring?) is a known issue with the W220 was faulty and has been replaced.

The driver's seat down not heat but the back does, so I was thinking of SRS seat sensors, but I am not sure if there is a SRS sensor mat under the driver's seat. - Although I think some systems adjust the force of the SRS based on smaller drivers.

I do not think the car has been in an accident. Although I do notice some alignment issues w/ the front bumper cover.

I have dried spring a little contact cleaner in the seat belts, but not too much.

I guess I really need the error code to know where to look first.

I have an old AutoEnginuity USB code reader, but to upgrade it to read MB airbag data costs $1400, it looks like it only displaces basic status, and I am not sure if it can even reset the codes.

I am looking for a more reasonable solution for the little use I give it, but it would be nice if it worked for my 97 BMW z3 as well.