http://www.langzeittest.de/opel-zafira/index.php
Paste this German web site address listed above in to http://babelfish.altavista.com/babelfish/tr and select translate web page into English form German. Go to the Technical (Technology page) you will see a whole host of mods. One of those is how to enable the 12v supply (relay) etc.
Steve
April 2005