cuppie's suggesting remaking the grounding splice that you modified at each light, since physically moving the connection makes things work or fail. I'd echo his thoughts on the combination switch/headlight high low beam switch/turn signal stalk, for which you'll have to remove the steering wheel and disconnect the air bag. Bad grounds on VW's can cause huge headaches and are worth attending to carefully. Check the grounding screw if you can access it and clean it up as needed, then use no-ox and put it back together Can't hurt to check fuses and relays, either. Relay 173 is for daytime running lights on the B5 Passat, I believe. This thread might help. I've never heard of this switch being serviceable, but it may be.