No, no, no.
If the SRS light comes on for a set amt of time (apprx 90 seconds) every time you start the car, then it is one of the two front seat belts. If it goes on at random or is not consistent with TIME ON (of the light) at each start, then I'd checking the charging system. Other wise, it's one of the front seat belt buckles (female connector).
2006 E350 w/ 155k miles (Daily Driver)
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!)