Today I was leaving the grocery store, and I noticed my SRS light was on... and it didn't turn off! I stayed in the car for about 5 minutes hoping it would turn off (lesser malfunction when only on for temp time at startup)... so I have a constant SRS light now! Everything else is fine with the car.
I do have one thought though... about 1/3 of the time, when I engage the rear defroster, the light flashes, indicating a low voltage.. it always will come back on (steady) a few moments later. My chargine system seems just fine though... along with my really new MB battery. No other low voltage/no starting symptoms whatsoever. Well I decided to check out my owner's manual, and it said that low voltage could trigger the SRS light.
My question, how low must the voltage go for the SRS system to detect a malfunction? My ABS light is not/nor was on at all. So if this is the case, I'm thinking that the voltage would have to be the min voltage that the ABS needs to function properly.
I hope that made sense.. thanks!

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)