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Old 02-03-2006, 10:40 AM   #1
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Illumination wire ... CD Stereo Radio install

After searching through some posts and some web hunting, I'm still a little leery of hooking up the Illumination Wire (IW) for a new head unit. This is on a 3rd Gen Taco, but may apply elsewhere I suspect. I'm replacing an older Alpine (no IW) with a new Alpine 9845.

I think I have it narrowed down using this procedure found at the 'Talk Audio' forums here:
http://tinyurl.com/czrlp (Complete article)

Using a Multimeter to Solve Headunit Wiring Hell

5) Probe each of the loom/connectors using the red multimeter probe until you find a reading of around 12V. This is your permanent live wire. Label it using the pen and tape.

6) Turn on the ignition (set it to the "Acc"/"Accessory" position.. there's no need to start the engine. Probe all of the pins/wires except the one already identified as permanent live. When you find one with around 12V, label this up as the "ignition switched live"

7) Turn on your headlights, and repeat the process from step 6, ignoring already identified wires/pins. When you find a 12V signal, label this as your "illumination" wire (basically it tells the headunit to dim the display when your headlights are on).

So here's the factory plugs, plus a plug that I think was added later in an install.
Click the image to open in full size.

The upper two plugs are the factory wiring, and I’m thinking the lower single wire plug (white/green stripe….had to Photoshop the green stripe in the photo to show properly) is something someone added the previous install.
Many of the places on the net show the Toyota factory wiring using a solid green wire for illumination. See:

This is clearly not the case in my ’96 Taco. The 12V ‘lights on’ wire is definitely green/red stripe. The thing that has me puzzled is the extra single plug wire that goes to 1.77V only when the lights are turned on. The white/green stripe wire on the single wire plug comes out of the harness and is then finds it’s way to the small white factory plug in the ‘O’ position of that plug.
Click the image to open in full size.

The 'O' position shows 'DO NOT USE' in the above diagram, but....???

I’m thinking I should hook up the Illumination wire from the alpine to the 1.77V first….and see if that works. If that doesn't work, I may try the 12V green/redstrip wire that goes to the large blue factory plug at the 'J' position. (Also shown as 'DO NOT USE').

Mostly I’m just not up to blowing fuses with this thing at this time. I’ve seen some threads where people have run into problems with the IW, so thought I’d check to see if anyone successfully done the IW and where they connected it to.
Sorry so long winded…..
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'96 Taco Xcab, 2.7L, 5 speed manual, diesel wannabe

Last edited by PygmyCowboy; 02-03-2006 at 10:47 AM.
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Old 02-05-2006, 06:17 PM   #2
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Turns out the 12 V 'lights-on' wire on the factory plug....the green/red stripe, is the one to use for connecting to the head unit's Illumination wire. At least that's what the color code was on my '96 Tacoma.

Still don't know what the single wire plug was for, the one that showed 1.7V when the lights turned on. Ah well.
'96 Taco Xcab, 2.7L, 5 speed manual, diesel wannabe
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Old 02-05-2006, 08:28 PM   #3
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it could be for the clock or the memory
07 Tundra d-cab limited 5.7L 4x4 was my moms r.i.p 3/19/11
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Last edited by Elton; 02-06-2006 at 10:59 AM.
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Old 02-06-2006, 05:10 PM   #4
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Ya know, I think you're right. It seems to be the only other thing that's normally on.... and dims.... when lights are turned on.

Still why the H..... would it be connected to the small white factory radio plug??? Will likely remain one of the TMLs....Taco Mysteries of Life.
'96 Taco Xcab, 2.7L, 5 speed manual, diesel wannabe
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Old 02-06-2006, 05:10 PM
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