[helpthe95]

Hello all. I'm in the process of installing a Sony XAV AX 3000 touch screen head unit. My question is about the orange/ white striped "illumination wire". Does anybody know what specific wire in the vehicles factory harness this aftermarket orange and white striped wire connects to? After my research, this aftermarket orange/white Ilumination wire is only to dim the aftermarket headunits brightness when tapped off the (parking light/headlight power signal). Is/was there an on/off parking light signal behind the factory Delco head unit? I'm guessing there is but I'm assuming a factory dimmer wire is not going to be compatible with the design of Sony's "Illumination wire" (this may be true for other brands). I'm also guessing my Sony's Illumination orange wire is designed to be tapped into the parking light signal and not the dimmer. I guess my question is what is everyone doing with this illumination wire. Is the parking light "on signal" location difficult to get too? I have my lower dash off. Anybody know which wire it is? Is it in the FSM? I just want to be clear on dimmer or illumination dim. Illumination dim meaning the head unit dims a shade when the parking lights are switched on providing non distractive night driving. I have posted the aftermarket wiring diagram/instructions. Thanks

 

[95wagon]

Edit , read entire post., again
Re edited, missed the path of C1 6
Read post below for correct answer

 

[Z09B4U]

There are two "dimming" control wires going to a stock radio.
The grey wire (C1 cavity 7) that changes the brightness of the dash(and radio) light bulbs.
The yellow wire (C1 cavity 6) is called Dim Display Signal. It is a on/off signal controlled by the park lights. The circuit path is park light switch to fuse #42 Int Dim Fuse to the radio connector (and instrument cluster).

 

[helpthe95]

Thanks guys. I physically tested for the wire in my dash with a test light. The yellow wire switches on/off. The grey is dimming effect. In my application, for the Sony, im guessing it's the yellow for a shade lower parking light effect. Not a dimming effect like the factory radio. You would think 26 years later Sony would have a dimming effect on their radios as well for the full factory experience of a dimmer wheel in many vehicles. Anyway it is what it is. I've attached a photo of my snipped plug wires. It's kind of a cream yellow color. Also, for anyone who needs to know, there are two yellows so finding the one is either of the two. I'm not sure at this point what the second yellow is for. Thanks again. Edited: looks like the second yellow is for ignition control feed and/or rear speaker as per the attached wiring information sheets.

 

[helpthe95]

*Extra Notes: After testing and observing, the smaller guage yellow=rear speaker. The thicker guage yellow=ignition controlled hot. (The orange is constant hot.)