Another issue with the in laws new merc, the speed limiter works but the cruise control doesn't. He has one error message, BAS, brake assist visit workshop. I have searched and the main response is brake light switch faulty, replace at £10, bargain but would this stop the cruise control working. We kind of think it would as it may believe the brake is always on, or know of the error and know that pressing the brake would not stop the cruising speed. Now for this fault would an obd2 code reader pin point the problem or do I need to take it to someone with STAR? He says it all works fine and has no problem braking or using the handbrake etc. not sure what info you need but it's a 2001 c270 cdi auto. Thanks in advance.