Question about Pioneer DEH-P6800MP CD Player

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Car Radio just stoped working.

I have a Pioneer DEH-P6800mp and it just quit working, Nothing lights up. Pulled radio out of dash removed wiring plug and checked fuse ok. wired direct to battery but nothing happens. Also cant get face plate off without radio working. Thanks for any help. Rich

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My same model did this too. The wiring harness may have gone bad. Try direct wiring the stereo or replacing the wiring harness if you can get one. This fixed the problem for me.

Posted on Jun 28, 2009

  • castlewinds Jun 28, 2009

    Also your ribbon cable between the faceplate and mother board may be damaged or broke. if you pull the stereo out of the dash, and remove the sleeve it's in you should be able to remove the top of the unit by using a blade screwdriver or whatever is available to pop off the top by pushing the visable tabs and pulling up. With the faceplate toward you, look in the top of the unit, on the right side, toward the faceplate and there will be a set of wheel gears. (sort of like a clock) With your thumb or index finger push the largest white wheel toward the back of the unit, it will push rather hard, don't worry you will not break it. This will manually slide the grid out(faceplate holder), now you can take off the face plate. The ribbon cable(a copper/black colored flat cable will connect the stereo and face plate, visable underneath grid. Examine cable, especially on kinks as the may have cracked, split, or completely broke. If this is evident you can order another ribbon cable to replace it at part # XNP7026 faceplate ribbon cable. last I checked they were about $25.00 If you're not sure if it's damaged, you can plug the power back into the stereo with the faceplate still out and wiggle the ribbon cableup and down with the tip of your finger, if it suddenly starts to pull the faceplate back into the unit that is definately the problem. Hope this helps.


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Check regulator inside chasis. amplifier IC maybe burned. check TDA IC's along heatsinks.

Posted on Jun 03, 2009


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First you would need to purchase an aftermarket harness for the car the part number you need is a 70-8590 which is priced at $15.00 you can order it through me M&M Car Audio email address once you get the harness you plug that into the vehicle and wire that harness to your stereo harness color for color. After that you will have to mount it in your dash board .

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Hello ryan_jaime,

It's good that you have an aftermarket Mazda wiring harness. It will allow you to make all of the connections in a well-lighted and comfortable location rather than fumbling around behind the dash.

If you are somewhat skilled at soldering, the most secure, electrically conductive, and positively insulated splices are made with solder and heat-shrink tubing. You can get the needed equipment from any Radio Shack, Lowe's or even WalMart. Be sure to put the heat-shrink tubing on the wires BEFORE you solder them together. I had to say that! Because I've forgotten many times! But if the soldering route is not for you, get properly sized insulated inline crimp splices and the appropriate crimping tool. Match up each wire by function on the Pioneer harness with the corresponding wire on your aftermarket harness. Most of the time, the wires will be color-for-color matched. But make sure, sometimes wires for things like "illumination", "dimmer", "mute", etc may not be the same colors.

Disconnect the negative battery terminal while you are working behind the dash. After you have the harnesses spliced together, plug the radio end into your Pioneer, remove the old radio from the dash opening, unplug the antenna and wiring harness plug and plug the other end of your spliced harnesses into the vehicle plug and the antenna plug into your Pioneer's antenna connector. Slide the Pioneer loosely into the opening, but don't secure it yet. Reconnect the negative battery cable and test the receiver. If everything works, slide it into the dash opening and secure it. Use the rear support stud and rubber bumper if needed. Install the trim ring or separately purchased dash kit as required. Put the "face-fixing" screws in to prevent removal of the faceplate if desired. Reinstall any dash trim removed and you're finished.

Hope this helps.

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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.

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Needs front panel pioneer DEH-P6800MP

If you need to purchase a new faceplate, You're better off replacing the whole radio as it's cheaper.

You can buy them at
They are $200.87

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You can find the wiring diagram online in a PDF of the installation manual, which is at this location

Hope that helps!

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