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Old 05-16-2013, 04:52 AM   #1
Registered User
Join Date: Oct 2012
Location: St. Paul
Posts: 92
My Ride: 2004 325CI vert
? For installers, stereo light control wire

Hey guys,

I have an 04 325 vert that I bought with a Pioneer AVIC-Z120BT already installed in it. One thing that drives me crazy is the display does not dim when the headlights are turned on. I pulled the head unit and discovered that the wire had not been connected by whomever installed it. Form what I have read in the install instructions and the AVIC forums it looks like I need to connect this to a wire that is active when my headlights turn on. Apparently the stereo does not like a dimable source like the dash lights.

I would like this to be enabled when the auto headlights turn on and also if I turn the headlights on manually. So my E46 forum question is where can I find the right wire to tap into which will not cause problems with my car? Is there a wire that would work when the parking lights kick on that I could use? I have the glove box out and also have access to the headlight switch.

It is my understanding the headlight switch is not just a simple switch but is actually the Lighting Control Module which also stores odometer info and other things. I am not familiar with Canbus wiring systems (all my experience is involved with cars from the 80's and older). I just want to make sure I don't create other problems by tapping into something that is better left alone.
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Old 05-16-2013, 06:07 AM   #2
Registered User
Join Date: May 2010
Location: NS
Posts: 74
My Ride: ///M
There's an "illumination" pin on the factory harness that lights up the controls on the factory unit when headlights are on. Perhaps that's the one you need to tap. Disclaimer: I'm a complete newb when it comes to stereo, just trying to help.

See the diagram here (pin #13):
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Old 05-16-2013, 01:46 PM   #3
Registered User
Join Date: Oct 2012
Location: St. Paul
Posts: 92
My Ride: 2004 325CI vert
Thanks for the response eljay, I'll check pin 13 to see if it is a source that changes with the dash light rheostat. Hopefully it is a steady non dimable source I can use for my input signal.
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