That part I understand, the computer and various BUS modules and relays read off the different areas of the vehicle and report back instructions on what to do. The reason why you won't find +12v from a factory radio harness is because that is not how the trucks operate these days. Go looking for the bundle of spare wires up there, hopefully you'll have them on your truck too. but alas I was able to work around the issue without tapping into an important ignition wire. I'm still very confused why I couldn't find a 12 volt switched power wire up by the factory radio. I just tapped that one and ran a wire from there back up to my stereo wiring harness and just tapped into the red ACC wire which I had previously soldered and shrink wrapped all nice. I stripped it and tested it with the ignition switch and sure enough it was switched. Bingo! There was one labeled "ACC" It was white with a blue stripe. I un-taped the bundle and sure enough there was a sticker on them with labels that said what each of them were for. That's when I spotted a bare bundle of open ended wires coming out of the main harness above and to the left of the bake pedal. I couldn't find anything on the internet, but I started pulling panels off of my dash and poking around the wiring harnesses on the drivers side. I'm stumped because as I said I can hard wire the radio to the constant 12 volts and everything works exactly as it should. I think that is really where the problem lies right now. I'm trying to figure out why I have factory plugs behind the dash that I have no connections for on the aftermarket PAC unit and radio. The other two plugs are for items I don't have (subwoofer, rear seat entertainment, auxiliary devices, etc.) They are telling me it has something to do with the vehicle BUS computer or whatever. This made no sense to me at all because the only connection that has anything to do directly with the stereo only has the constant +12v (yellow) wires, ground wires, speaker wires, power antenna, steering wheel control and that is it. Crutchfield tech support seemed to indicate that the vehicle bus or computer or whatever needs to tell the PAC unit to actually create and deliver +12v on the red accessory wire to the stereo. But it was getting dark and the rain picked up so I abandoned ship for now. I was trying to do the same thing and start checking pins. The small 4 pin plug that used to control the volume, tuner and functions of the stereo was left out of the equation. The only two Ford harness plugs that were used with the PAC unit are the 21 pin and the smaller 10 pin that plugged into the back of the integrated stereo. The clock, compass and thermometer are NOT WORKING but I thought that was supposed to happen with an aftermarket install. My question is what are my options? The PAC unit obviously works somewhat I think because the speakers work, the satellite radio works, the CD player works and I the truck runs and operates like normal. I've been told those radios have had issues from time to time and the radio internals were most always the problem child there. One of the relays or some other part that tells the truck to send 12v to the accessory wires when the key is on must be malfunctioning and they think that is why the factory integrated radio stopped working. The only thing I need to be aware of is that I have to power down the radio when I get out so I don't kill the battery.Ĭrutchfield Tech Support seems to think that if I swap the PAC unit wiring harness and the problem persists that it's an issue with the truck. Everything in the truck works as it should. When I splice the red 12v accessory wire to the yellow battery wire from the PAC harness, the radio works. I did not try swapping out the PAC unit wiring harness, just the small module itself. I was sent a replacement PAC interface but it did not fix the problem. I tried removing the negative battery cable for 15 minutes then reattaching it, turning the key on, then off after about 15 seconds, then on again but it didn't work. The yellow battery wires (constant 12v) for the memory is getting power though. The problem I have is when the PAC module is wired up the Kenwood harness and plugged into the Ford plugs from the stock stereo, I do not get power to the new stereo when the key is on. So I bought an aftermarket Kenwood double DIN from Crutchfield with the recommended PAC unit and the replacement dashboard kit. The clock was blinking (with the correct time), the compass and thermometer worked as usual but that was it. It finally died altogether about two weeks ago. It would refuse to power on for whatever reason then out of nowhere it would come on while I'm driving, or after sitting for a while, whatever. Okay so the factory integrated stereo crapped out a few months ago.
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