Head Unit Won't Turn On

[BumpMW 10+ year member]

I am trying to install a Pioneer DEH-3900 in a friends car. I found the switched 12v wire, the constant 12v wire, and the ground wire by using a volt meter. I hooked everything up correctly to the HU but no power.....checked the fuse and its fine

any suggestions on what the problem could be?

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[dman4486 5,000+ posts]

in the wiring somewhere

 

[rr123]

how did you find the ground wire with the dmm?

 

[_JaY_ 10+ year member]

if im right, just to see if it will power on put all the yellow and reds together, or just 2 yellow 1 red...i can't remember exactly..try that.

 

[rr123]

i take it you are tapping into the factory wiring without a wiring harness adapter?? what kind of vehicle? some GMs require a special adapter.

 

[blackbonnie 5,000+ posts]

this is why you never cut the factory wiring and you have adapter for 10$ that will do everything for you and all you have to do is match colors. learn from your mistakes

 

[blackbonnie 5,000+ posts]

what car is it in,maybe we can get you a wiring diagram

 

[rr123]

this is why you never cut the factory wiring and you have adapter for 10$ that will do everything for you and all you have to do is match colors. learn from your mistakes

x2

 

[Trey803 5,000+ posts]

x3

 

[soloXgt 10+ year member]

did you try pushing the power button........//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[dman4486 5,000+ posts]

did you try pushing the power button........//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif...that would be awesome

 

[southwest713 10+ year member]

^^^//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif:laugh://content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[blackbonnie 5,000+ posts]

lol

 

[BumpMW 10+ year member]

1995 mercury villager. I wasnt the one to cut the wires, i came into the picture later to help out.

He showed me everything and it was like two separate units. One for the radio and cassette player and another one was the CD player. There was only 3 wires going to the CD player according to the driver of the car.

Any suggestions on where i could get wiring diagram....other than the dealership?

 

[blackbonnie 5,000+ posts]

1995 Mercury Villager Stereo Wiring

Constant 12V+ Green/Purple

Switched 12V+ Yellow/Black

Ground Black/Light Green

Illumination Green

Dimmer n/a

Antenna Right Front

Front Speakers 5" x 7" Doors

Left Front (+) Orange/Light Green

Left Front (-) Light Blue/White

Right Front (+) White/Light Green

Right Front (-) Dark Green/Orange

Rear Speakers 5" x 7" Side Panels

Left Rear (+) Light Brown/White

Left Rear (-) Light Brown/Yellow

Right Rear (+) Light Brown/Green

Right Rear (-) Brown/Pink

hope that helps