Question about Pioneer DEH-P4800MP CD Player

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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

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  • 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

    Great!

    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

    KaeZoo,

    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.

    jc

  • 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?

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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.

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http://rds.yahoo.com/_ylt=A0geu58A6rVHE24AmppXNyoA;_ylu=X3oDMTE5MXNibDFlBHNlYwNzcgRwb3MDMgRjb2xvA2FjMgR2dGlkA0gwNzJfMTE4BGwDV1Mx/SIG=14inv3p40/EXP=1203190656/**http%3a//www.service.pioneer-eur.com/peeservice/instrmanuals.nsf/0/2D4D9080B63F6EB9C12570EE0049C3E7/$File/MAN-DEH-P4800MP-GB.pdf

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