Alright, the carpet under the seat was NASTY!

After vacuuming and cleaning with carpet cleaner, it is much cleaner underneath the reinstalled seat.

Old seat is back in and connected, ABS light (actually the SRS light) is now off.

I looks like I did accidentally switch bulb locations for the SRS and ABS dash lights. Will need to correct that soon.

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2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)