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What is the orange "illumination" wire for?
I'm installing a new stereo on my 10 year old BMW. The one that I'm replacing is also not from BMW, but not the same brand as this new one. So I need to redo the wiring to the ISO connection lead.
Everything is fine, just connecting same colors together. But there's an Orange wire on the connector labeled "illumination". There was an orange wire on the old stereo, but there's no orange wire on this new system. There's no "illumination" on the manual either.
What is the orange wire for? Is it OK to ignore it?
An illumination wire simply lets the head unit detect when your headlights are on. When voltage is detected on the wire, the unit will dim the display so that it doesn't hurt your night vision. It is NOT for turning on the radio display lights, and it does NOT allow you to adjust the head unit display using the vehicle dimmer switch. It just dims the display when your lights turn on.
The factory radio harness usually contains one or more illumination wires. You can test for it using a multimeter. A true illumination wire will show 12 volts with the parking lights on, and 0 volts with the lights off; it won't vary with the dimmer switch. You may find a "dimmer" wire, which will show voltage with the parking lights on, but the voltage will vary as you adjust the switch. You can connect the new radio's illumination wire to either one and it will work, but using the true illumination wire is better.
~TheKushNetwork~ Presents: One Minute Bong Clean
Tags: bajar, cd, certification, faq, orange, reference, security
