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Head unit won't turn on, worked for a few then cut off. I have replaced the fuse in the back of the radio and checked wiring harness.

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Is this radio installed in a vehicle?

Posted on Mar 27, 2011

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Im replacing the radio with an aftermarket, i have installed it with proper wiring harness but the new head unit will not turn on. any suggestions?


Go to the Crutchfield site and check just in case you are missing something. They probably sell the same radio and in a pinch you can call them and tell them you can't get it to work; someone should be able to help you out. They do offer great speakers and trim panels to make it look like a factory pro install too.

Mar 21, 2015 | 2003 Oldsmobile Silhouette

2 Answers

Pioneer DEH-3300 UB


Apparently, you have no power at the 12 volt battery/memory wire at the radio harness of the vehicle. This wire is white with blue in color.
Also, based upon your description, you have connected the battery/memory wire and the accessory wire of the radio to the 12 volt accessory (switched) wire of the vehicle. This wire is white with red in color.
Check the radio/ stereo fuse of the car. You may have blown the fuse during your installation.
You have no memory at the radio because when you turn off the key, you lose all power to the radio.
Also, I mentioned the wire colors just in case you used an aftermarket radio wiring harness. Make sure that the yellow from the Pioneer unit is going to the battery power source and, the red of the Pioneer is going to the switched power source.

Sep 12, 2012 | Pioneer Car Audio & Video

1 Answer

I have a 1992 mecrury sabe sw that i'm trying to put a new head unit in. i took the stock radio out and disconnected the wires and power cord but now the new head unit won't turn on, the stock...


check here and make sure that you have power coming into the harness, if not back track it to the fuse http://www.installdr.com/Harnesses/Ford-Wiring.asp you want to look at this one Standard 2 Piece Harness Up To Late 1990's

Jul 19, 2011 | 1997 Mercury Sable

1 Answer

Hello, the name's Jordan The Product: Pioneer Avid D3 Navigation system. Here's my problem: The screen will not come on. I have already attempted to hit the reset button, and still nothing. My...


Sounds like a power issue. If you don't have power on both the constant and the switched ignition wires for the head unit you'll usually end up getting the little LED light on the unit so it looks like it should be working ok but the screen won't turn on and the unit won't work. If you can take the head unit out yourself and access the wires behind it then here's a simple walk thru that you can use to pin point the issue.

First things first, before taking the time to remove the head unit, check your fuses in the car fuse block. If your fuse box cover doesn't give a description for each fuse, then look in the owner's manual for the car. (flip to the very back index under "F" and it will have a page number for "fuses". The first one to check will be the Radio fuse. If this one is ok, then also look at the following:
Accessory, cig lighter, instrument cluster, interior lights/domelights, audio, and amplifier. Not all cars have the same fuses and names, so just look thru the descriptions carefully and use your best judgement. In some vehicles the radio actually shares a power circuit with the things I just listed above, even though you wouldn't think it makes much sense. Also, keep in mind that most cars have multiple fuse box locations so if you don't see it on the interior fuse box, be sure to check the underhood fuse box too. Some cars will have a fuse box under the driver's side dash, another on the passenger side, another under the hood, and some cars even have them in the trunk or under the back seat.

If all these fuses check out ok then you'll need to dig a little deeper. Here's where you'll need to pull the head unit out of the dash and access the wiring. If you unplug the main radio harness from the back of the Pioneer you'll notice that there's a fuse here as well. They're usually a red, 10 amp mini ATC fuse. If this fuse is ok then continue on.

In order for a radio to turn on and work you need to have 3 wires connected properly. With just these 3 the unit will turn on and act just the way it should but you wouldn't hear any sound without the speaker wires being connected etc.

The 3 main wires are Power (aka 12+ or battery), Switched Ignition, and Ground. The Power wire is YELLOW and is considered a constant power wire. This feeds just enough power to the radio at all times to retain audio settings, radio channel favorites/presets, the clock and so on without killing your car battery.

Switched ignition is the RED and this wire only provides power when the key is turned on. Technically you can wire both the red and yellow wire to ignition only or constant/battery only but then every time you turned the car off you'd have to set all your favorites again, redo your audio settings and reset your clock OR if you wired them both up to constant instead your radio would stay on even when you turn the key off and you'd come out to dead battery every morning.

The ground wire is BLACK. This should be either connected to a ground wire in the radio harness, or if the specific car side radio harness doesn't have a ground wire, you could also connect this wire straight to metal inside the car.

If all the fuses are still good in the car using a voltmeter or multi-meter with a voltage setting and put the black terminal lead on the BLACK ground wire and the other terminal lead (usually red) on the YELLOW constant wire first. With the key turned off you should see anywhere from about 11 to about 13 volts. If you do, that's good. If not, you have a fuse blown somewhere in the car or a bad connection on this wire between the car harness and your radio harness.

Now, keeping the black lead on the ground wire, put the other lead on the RED Switched Ignition wire. With the key turned off thise should read at 0 volts, now turn the key on and you should get again somewhere between 11 and 13 volts. If you don't have power in this wire with the key turned on then again you have a blown fuse somewhere that you missed or a bad connection between the car and radio.

IF you didn't get any power on EITHER wire with either the key on OR off then you probably have a
bad ground connection. Put the black lead from your meter onto bare metal and repeat the last steps with the YELLOW and RED wires. If you get voltage now like you should have in the above steps then you know you have a bad ground connection between the car and the radio. Double check the ground connection or just attach the black wire from the Pioneer directly to bare metal in the car. Good luck

Dec 01, 2010 | Pioneer AVIC-D3 Car DVD Player

1 Answer

Car battery died, radio wont turn on anymore


Have you checked the fuse at the back of the head unit. You will need to extract the head unit from the slot. There is a small blade fuse near to where the wiring harness connects to the back of the unit. Check it to see if it has blown. It normally is a red 10amp fuse.
Also check your main fuse board.

Hope this helps
Regards

Oct 16, 2008 | Pioneer DEH-P6800MP CD Player

1 Answer

My new head unit won't work


My thought is that there is a fuse blown. If you put the factory back in and that didn't light up then there is definately a fuse blown. Correct me if I'm wrong but guessing that you didn't cut the harness, by the fact that you could put the factory unit back in, you probaby don't have a problem with wiring. Aslong as you matched up wiring colors with the harnesses the wires should be fine. The next problem should be a fuse. Not all fuses blown in a way that is easy to see. Just replace the "radio" fuse in your fuse panel and give that a shot. If you still have problems get back to me. Good Luck!
-Andrew Hawkins

Jun 20, 2008 | Car Audio & Video

1 Answer

Ok i am putting in a alpine head unit in a 99 neon i can get it to hold the memroy i have to put the red and yellow wire together and do the same on the wiring bracket and when i put all for together the...


The yellow wire must be connected to a constant voltage source. You have the red and yellow connected to a voltage source that only gets power when the car is turned on. The yellow wire is for the memory. Check the fuse box for a fuse that has voltage on it when the car is off and the key is not even in the ignition. That is the type of connection the yellow wire needs. The red wire can stay connected to the place it is at now.

Are you using a harness that is made for installing a radio into a 99 neon? They sell them at most all places that sell car stereos. Go in and ask for an installation harness for your car and then you connect it to the harness that comes with your radio by matching the colors of the wires and you have a nice and easy install. It plugs right into the factory harness with all the connections you need.

Jun 17, 2008 | Car Audio & Video

1 Answer

Pioneer deh 1600 has no power


Well.. if there is smoke coming from the head unit, the head unit could be bad. It odviously may have a wire crossed or a fuse blown, or even the wire harness could be bad. First, check the fuse for the radio on drivers side door, then check the other fuse box under the hood. Make sure all radio fuses are intact and not blown. Second, check behind the head unit to make sure no wires are touching each other and shorting out. Third, if nothing else helps, buy a new head unit & wiring harness :]

hope this helps!!!

Jun 12, 2008 | Pioneer DEH-1600 CD Player

2 Answers

Jensen VM9311/ UV7i wont turn on!!?


Yo, I've got the perfect solution to your problem. Pull out the head unit from your dash. Then, remove the wiring harness carefully from the unit. Now, push in the yellow power wire (even jiggle it a little) making sure it's tightly snug the small port of the wiring harness. Then, plug the harness back into the unit and try turning it on. I've found that the wires come lose easily on this unit. hit me back up at Darkintel74@aol.com.

Mar 03, 2008 | Jensen VM9510 Car DVD Player

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