ets/abs 95 s320

[mariesu]

hi, i have a 1995 s320 in the shop. it has abs and ets lights are on. i am using a modis with german software. i am unable to retrieve codes. knowing what i know i did replace brake light switch. this did not make a difference. the light comes on sometimes when you crank the wheel. always when turning the wheel to the right about 3/4 of the way to stop. this can be with vehicle sitting still. the left front tire is of different brand, but same sizes. the right rear was underinflated about 10 lbs corrected - no difference. battery charged to 14.5 volts. we replaced the wiring harness about 6,000 miles ago, when we did valve job on engine. any help will be appreciated.
thanks,
marie