I need help with my passat 99

i have this cable disconnected next to my motor i connected the cable today to see if i fix the problem with the flashing oil light
everything was ok for a half hour then the light start flashing again and my RMP reader stop working and the switch for the ASR (Anti-Slip Regulation) stop working 2 please if someone give me a idea what could be the problem i don't want to take it to the dealer for they can start making stories about the problem here is a pic from the cable im talking about tkz for u help

http://img163.imageshack.us/img163/9294/1234u.png