My C class(1999) estate column switch will not operate the wipers, indicators or headlight flashers or screen washers. It does operate the dip/mainbeam when the lights are switched on. I have replaced the DAS2 keyswitch, as advised by my local "expert" at great expense, but all to no avail. Any ideas out there? Correction, I think the keyswitch is the DAS3 model, its fully electronic.