The ASR light is always, on or comes within minutes even if standing still. When I connect the MBZ breakout box tool I bought from the dealer a few weeks ago and a DTC, it seems to cause the ABS light to illuminate, as once it's disconnect the ABS light goes out. ASR still light remains illuminated. So, based upon your comment, I am not sure why this might be happening, or what, if anything, I am doing wrong. Not sure what direction to go at this point.

Also, when I purchased the breakout tool from the dealer,I purchased a new brake light switch just incase. I haven't replaced it, as I am not getting any code that says the present one is not working.

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Mercedes Fleet:
2004 CL600 Designo Espresso SPORT
2004 S600 Designo Espresso SPORT/Lorinser Pkg.
1999 S320
1988 300TE
1972 280SEL 4.5
Diesel Fleet:
2014 GL350 Blutec
1987 300SDL Blk/Blk 4 place seating #18 head
1987 300SDL Smk Slv/Burgangy #17 head
1986 300SDL Blk Pearl/Palomino #14 head w/ 280K
1984 Lincoln Mark VII Fact BMW Turbo Diesel