Question about Pioneer DEH-P4800MP CD Player

1 Answer

New pioneer deh-p4800mp doesn't work

I'm trying to fit a Pioneer DEH-P4800MP CD Player in an old (1990) Honda Civic. Should be straight forward but the unit will not switch on despite 12V (via the yellow 12V constant power cable, i.e. not routed through the ignition accessory switch) correctly supplied to the ISO port at the back and 5.2 V available at the control unit interface at the front. Is the control unit faulty or am I missing something? If the former, is there a way to check it? Any advice greatly appreciated. jc

Posted by on

  • 2 more comments 
  • John Chisholm Mar 15, 2007

    Oh, I didn't realise that. On the installation sheet it does say that the red lead should be connected to a terminal connected with the ignition switch if there is no accessory setting. However, I have no wiring diagram for the Honda that shows which of the wires in the iso connector are linked to the ignition. I could measure for 12V on each with the ignition on but it would be preferable to know which colour wire to connect to.

    In any case, many thanks for the reply. Much appreciated.

  • John Chisholm Mar 15, 2007


    When my wife brings the car back this evening I'll check for yellow/red. If that solves it, you get 5 stars from me.

    Thank you.

  • John Chisholm Mar 15, 2007


    FYI, the ignition accessory wire in my Honda Civic is white/green. In any case, the CD/radio now works perfectly.

    Many thanks for taking the trouble to help me.


  • lilbadas01 Oct 26, 2008

    so did you connect the acc and power to the grn/wht or yellow to the grn/wht and red to the red/wht?



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 156 Answers

How about the red (switched power) wire? The unit will not turn on unless you have 11+ volts on the yellow AND the red power leads.

Posted on Mar 15, 2007

  • Brian Neathery
    Brian Neathery Mar 15, 2007

    My information lists the accessory wire in that vehicle as yellow/red. Alternately you can connect the red wire to the same source as your yellow wire, but this will cause the radio to stay on regardless of key position.



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Connecting a Pioneer DEH-P4800MP stereo to Peugeot 206

There is a nice pricey part you can buy for that if you mean what I think which is having radio control on your steering wheel if so then look up your car and steering wheel controls adapter

Jan 22, 2014 | Pioneer DEH-P4800MP CD Player

1 Answer

Deh p4800ph

hey i have the same problem...if you had fix this please let me know in a email

Jan 31, 2010 | Pioneer DEH-P4800MP CD Player

1 Answer

I have a Pioneer DEH-p4800mp and I connected to amplifier when i stop the cd player does not stop the amplificator

Question? have you also connected the Remote cable from the CD player to the Amp? or have you only got 12v & gnd hooked into the amp? if so then the amp will be on all the time. the remote goes from the CD player to the amp, usually a blue cable from the back of the head unit.

Jan 12, 2010 | Pioneer DEH-P4800MP CD Player

1 Answer

Trying to figure out the wiring for and 85 chevy truck i have a pioneer deh p4800mp

the red on the player is acceley (hot when ignition is on) and the yellow is constent hot (hot all the time) and the black is ground but u can go to a radio shot or walmart and get a plug that wires to your stereo color to color and then plugs into the factory wiring harness

Oct 06, 2009 | Pioneer DEH-P4800MP CD Player

1 Answer

New iTouch doesn't work in DEH-P4800MP

The newest versions of the Iphone uses USB charging only, while older generations of (any) Ipods used firewire for charging. First generation Iphone and Ipod Touch could be charged with either method. Most docks historically used the firewire charging method, making them incompatible with all but 1st generation Iphones. You need a new cable/charger that charges with the USB method.

May 07, 2009 | Pioneer DEH-P4800MP CD Player

1 Answer

IPod Adapter kit for DEH-P4800MP

Yes it does, I have proof.

Open a new window/tab browser. Click this link to the PIONEER WEBSITE PDF File for this cable. Please refer to page 7of 84, and look in the category "head unit group 1"... From the BOTTOM LEFT of this paragraph count up FIVE LINES, your Head Unit Model number is right there.

I hope this helps,

Jun 16, 2008 | Pioneer DEH-P4800MP CD Player

3 Answers


I have the manual if you would like me to scan a few pages and email them to you

Mar 01, 2008 | Pioneer DEH-P4800MP CD Player

2 Answers


Download a manual;_ylu=X3oDMTE5MXNibDFlBHNlYwNzcgRwb3MDMgRjb2xvA2FjMgR2dGlkA0gwNzJfMTE4BGwDV1Mx/SIG=14inv3p40/EXP=1203190656/**http%3a//$File/MAN-DEH-P4800MP-GB.pdf

Sep 29, 2007 | Pioneer DEH-P4800MP CD Player

Not finding what you are looking for?
Pioneer DEH-P4800MP CD Player Logo

Related Topics:

398 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pioneer Car Audio & Video Experts

The Knight
The Knight

Level 3 Expert

75871 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers


Level 3 Expert

83054 Answers

Are you a Pioneer Car Audio and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides