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DEH-P8400MP unit is dead & un responsive. power to unit has been checked along with ground. OEM equipment replaced & operates faultlessly with same power supplies

Posted by estorilkid on


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SOURCE: Stopped working

I had a similar problem with a jvc 8040. when I replaced the fuse it became very obvious that the b1560 output on the center channel was blown (smoke and sparks, always a dead giveaway). I haven't fixed the center channel yet but simply unplugged the center channel board and removed it from the unit. Now everything works fine except of course the center channel. Pre outs still operate just fine so a slave amp could be used for center channel power, or you could just go and buy a marantz amp; I did and then I realized that I was lucky that the old jvc quit.

Posted on Jan 30, 2008


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How to install a pioneer deh-p8400mp car radio

Here is the wring harness colour code for Pioneer.

Yellow= Constant 12V
Red= Switched 12V
Blue=Power Antenna
Blue/White stripe= Power Amp Rmote turn-on
White & White/Black stripe= Front Right Speakers
Grey & Grey/Black stripe= Front Left Speakers
Purple & Purple/Black stripe= Rear Right Speakers
Green & Green/Black stripe= Rear Left Speakers
Orange= Illumination


Apr 27, 2012 | Pioneer Car Audio & Video

2 Answers

No power, display is dead. Is there an internal fuse that can be replaced?

Sorry to read about your problem.
It seems your have a general failure in the power control or switch failure on the unit. if you unit has power, and things lite. it is more likely you have a control/switch problem,

Their is no fuse to replace

I tried to help you. Please help me and Rate/Vote on my response, thanks and good luck

Dec 22, 2010 | GE XL1800 1100 Watts Microwave Oven

1 Answer

I have a pioneer DEH-8400mp. When you press the OPEN button which drops the front faceplate, the rear display turns off, and none of the buttons do anything. Can you help?

It is the failure of the flexible strip line wire that comes to the panel as this strip breaks of after sometime due to use.
you will need to remove the panel and the main unit to replace the strip which can be procured from Pioneer.

Oct 01, 2010 | Pioneer DEH-P8400MP CD Player

1 Answer

Hi, i jave just bought a used Pioneer DEH-P8400MP. The guy told me that id did not work no more and that the problem should be the whire to the front plates. Now i habe installed new whires but it still...

The electronics on the main circuit board may be faulty, it can be beyond a home repair I am afraid.

It is possible that the power supply wires were connected in reverse at one time, damaging the circuitry inside.

Oct 24, 2009 | Pioneer DEH-P8400MP CD Player

1 Answer

I've a Pioneer DEH-P8400MP. I get no sound out of the ISO speaker connector, only out of the RCA outputs. This told me that there was a problem with the IC Amplifier (a PAL007A I believe). A quick check...

no it isn't obsolete and there are replacements and cheater replacements. the pal 006a,pal005a,tda 7856/7854,7386,and the cheater one that will work and you already probably have is the ic from an original delco radio off of a chevrolet radio. but it will not have a remote wire to it.

Apr 02, 2009 | Pioneer DEH-P8400MP CD Player

2 Answers

Locating a PAL007A

Just get the
TDA7386 and thats all... I think it should not be the problem to get that one.

Apr 02, 2009 | Pioneer DEH-P3500 CD Player

1 Answer

How to connect a pioneer super tuner to a 91 honda accord

With a DC voltage tester, check the two power leads for 12+ volts and proper operation, and be sure the unit is properly grounded.

The two power leads are,

1.Constant feed: which should be connected to an un-switched power source that delivers continuous
power to the units memory.

2.Switched feed: which should be connected to a switched power source controlled by the vehicles ignition switch.

Before installing in dash check unit for proper operation.

Good luck

Mar 27, 2009 | Pioneer DEH-P2900MP CD Receiver...

1 Answer

Need pic of power, speaker harness ------ copy and paste this. i hope this is what your looking for.

Oct 04, 2006 | Pioneer DEH-P8600MP CD Player

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