There are two brushes under the steering wheel much like the brushes in the voltage regulator. These are seperate little spring loaded brushes and are pretty cheap. But they look like they would last quite awhile so not likely to the source of your SRS light. My SRS fault turned out to be the horn hub that the brushes rub against. This is a bit more expensive, about $100 nowadays. So you might check the brushes and clean it out before spinging for the hub. There was nothing obvious about my hub being defective, it looked fine. But changing it out eliminated my SRS light. Also SRS lights may be from your seatbelt connections.

If you notice a correlation between the turning of the steering wheel and the flashing of the SRS light, then could be brushes but most likely the hub.

Another person and a long cheater bar come in handy when you try and break the steering wheel nut.

glenmore
1991 300CE
2000 C280