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Ok i know im not a pro at installs but ive done over 15 decks before and never had a problem untill I got to this one...

Pioneer DEH-P3900... i figure what the hell cant be hard i mean ive done in dash DVD and they were pretty easy...

Bsically put it in a 2002 Nissan Xterra that has the a pillar tweeters...

Now i was asked to put this in for a friends because he was having trouble with it... I cant get the damn thing to power up!!!

It cant be blown because number 1 the fuse hasnt tripped... there is no indication of a burned out HU by smell or anything...

I even hooked it up directly to power and grounded it and still NADA!

Its def not the HU at least in my Opinion cause we returned 2 of them already... Either Bestbuy has given us 3 defective Pioneer DEH-3900's or I'm missing something.

I checked over the Wiring Harness and everythign seems to be ok... Although i do not have a voltage meter to check each wire... might go out and get one from Radio Shack today just incase...

Is there anythign i can do to get this damn thing working? Can I hook it up to a battery and then ground it and run the ACC to the power to get it to go on?

check all the stock fuses, even under the hood, the memory wire will sometimes be on something like the horn fuse or a cigarette lighter and maybe all 3 on the same fuse.

Oh yea ... i checked under the hood... 15amp fuse is fine... but i had no idea there was a "Memory" wire... i will just check all the fuses to make sure... Oh i was wondering are all pioneer wiring harnesses the same. Because i was thinking about taking my deh-p6500 out of my truck and hooking his up in mine to see if it works... good idea, bad idea? lol

actually from what im finding it looks like it will fit the same harness... just my luck

connect + on the batt to ACC and + and connect - to - batt if it doesnt turn on its the hu if it does its the car.

what about the ground... so far what im getting from that is connect the ACC to the poitive terminal on the battery, and the Yellow power wire to the Negative terminal on the Battery

NOOOOO thats bad! yellow and red to battery and black to ground!!!

haha ok jus checking just the way i read it i was hearing that and i was like hmmmm well thats not right lol

Bill is it really possible that i could have gotten 3 units that dont work? I mean i only saw 2 of them but the first one smelled like it had been fried... but not recently... U know what im talking about right... Like When u fry a stereo u get that strong smell initially, but after a while it just smells faintly of it. Well thats what that one smelled like... and this one doesnt even get close... I just thought of something ... he has the Pioneer IPOD interface for it... u dont think that could short it out could it?

its electrical you could get to close and it would blow up lol. its hard to say.