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Old 08-02-2013, 04:24 PM   #3
Astra La Vista!
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Join Date: Apr 2009
Location: Vancouver, BC
Posts: 1,490

2008 Astra XR
Default Re: Headlight Switch Wiring Layout

Originally Posted by stoickiwi View Post
So I'm wondering if anyone knows or has a diagram of the wires that are leading to the headlight/foglight switch on the Astra. I'm hoping that it has a 12v connection somewhere in all of those little wires that I may use to trigger the relay for my rear fog light install.
The headlight switch communicates with the various power distribution points through CAN-bus, so a "hot" signal at the switch may not necessarily work for you. Can you find a Grey w/ Blue wire at the back of the headlight switch and test it? This one should feed power to the rear fusebox, which then in turn sends a signal to the engine bay fuse box to feed a constant 12V signal to either bulb. My guess is that the Grey w/ Blue feed is only temporary, so you'll either need some sort of latching relay for your rear fogs, or just run power straight from the final bulb circuit all the way back.

Don't you just love modern automobile electronics?

"That's a Hruck Bugbear, manufactured in Eastern Europe in the eighties and imported to the States. People mock it as a poor man's Yugo. I consider it the pinnacle of Cold War Balkan engineering."


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