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Message: <blockquote data-quote="Herbert" data-source="post: 454814" data-attributes="member: 18029">Onboard switch???  what and where is the switch located?? Are you referring to the On-board-computer (OBC), air-con switch, temp switch, headlight switch??  there are many onboard switches....be more specific in order for us to give you advice.  Did you send the e39 523i to a bmw specialist for diagnostic test and mechanical checks before you confirmed the purchase?? If YES, I am sure you would know what are the items that need repairs and/or replacement.  If NO, then I wish you good luck.  Car dealers will promise you everything under the sun and once you have confirmed and signed for the purchase, dealer will use the cheapest solution to rectify/repair your car.</blockquote>