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Where can i find an ACC wire for my android head unit ?
Hello everyone
So i recently installed an android head unit on my 2005 w220 s350, the thing works great except for one thing, i couldn't find a source to connect the unit's ACC wire and i currently am relying on the front ashtray illumination to power the head unit (yes the HU doesn't work with the lights switched off smh). I looked everywhere for a 12v source that switches on at the ACC ignition position but with no luck, every wire gives a constant 12v even when the key is out of the ignition switch, i've checked the ashtray, COMAND wiring harness, CD changer, navi, bose amp, AGW, antenna amplifier thingy and even the AC switches wiring harness. I have had a look at other forums where people installed an aftermarket head unit and finding an ACC source does not seem of an issue. What am i doing wrong? does anyone know where to find the ACC wire so i can sleep in peace?
btw this is what my oem comand plug looks like:
I have read that the blue wire is used to wake up the comand unit, but it is not an ACC wire as i've measured the voltage and it gives constant 12v even with the key removed from the ignition switch.
While i previously tried to utilize the cigarette lighter power, it had a constant 12v supply, turned out it did not have its own power supply because someone (while it was with the previous owner) cut its 12v supply and extended a wire from the ac controls which keeps giving power even when there is no key in the ignition. Long story short i spliced the original 12v cigarette lighter power back and ran a wire from there, works perfectly.
The PO probably wanted to keep power on a cell phone, bluetooth adapter, GPS, or some other such device.
Well, i know the PO personally and I'm gonna out on a limb and assume that he took it to an indy shop to fix a non working cigarette lighter and the "electrician" couldn't find the burnt fuse (yes they are that inept where i live) so he took a shortcut, i replaced that fuse just recently while investigating the cigarette lighter (after 3.5 years of ownership).
But that is just my assumption and your's might be the case, who knows . In any case, I appreciate your help.
11-18-2020, 12:47 PM
smh). I looked everywhere for a 12v source that switches on at the ACC ignition position but with no luck, every wire gives a constant 12v even when the key is out of the ignition switch, i've checked the ashtray, COMAND wiring harness, CD changer, navi, bose amp, AGW, antenna amplifier thingy and even the AC switches wiring harness. I have had a look at other forums where people installed an aftermarket head unit and finding an ACC source does not seem of an issue. What am i doing wrong? does anyone know where to find the ACC wire so i can sleep in peace? 
. In any case, I appreciate your help.
