Question about Pioneer DEH-46DH CD Changer

13 Answers

How do you check the fuse resistors on Pioneer DEH-46DH?

The Pioneer DEH-46DH CD changer is not powering up
Using a continuity tester on the wiring harness:
-Main supplied power(regardless of ignition switch position) is good.
-Lighting switch power is good up to the fuse resistor, but not after it.
-Ignition switch controlled power is good up to the fuse resistor, but not after it.
Is the current through the fuse resistor too small to illuminate the light in the continuity tester, or is a volt-ohm-meter required?

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  • 8 more comments 
  • rwp2004 Jan 21, 2009

    What setting on a multimeter is used to check a fuse resistor on the wiring harness and what type of readings will show if it is not faulty?

  • rwp2004 Jan 21, 2009

    What is the purpose of the fuse resistor?
    Why didn't the factory just use a fuse?

  • rwp2004 Jan 21, 2009

    Thanks for all the good advice.
    Ok, checked the fuse resistors, with a volt meter and they are good. So, every power supply in the harness checks out, but still the unit will not power up.
    Does this mean I have to get a new unit?

  • rwp2004 Jan 21, 2009

    Or, can I take the cover off and look for something internal that would be obvious?
    I'm in the process of taking it out of the dash.

  • rwp2004 Jan 21, 2009

    what are the common problems with these types of units?

  • rwp2004 Jan 21, 2009

    The symptons before this were - occasionally the unit would just shut down while playing a CD.
    The nest day it would turn on and then shut down, and then it would not turn on at all.

  • rwp2004 Jan 21, 2009

    Will the new units accept the same wiring harness?

  • rwp2004 Jan 22, 2009

    Does anyone know what would cause this pioneer unit to stop working even though all the power supplies are good? It is dead.

  • rwp2004 Jan 22, 2009

    The Vehicle is a 1995 Chevy 1500.

  • rwp2004 Jan 22, 2009

    Thanks, the discussion led me to research areas that helped increase my knowledge to diagnose the problem with the DEH-46DH.

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13 Answers

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  • 39 Answers

A fuse resistor should have a low resistance to allow power to flow the electronics. If you measure voltage from the electronics (load) side of the fuse to ground with a meter you should see voltage at the measurement point with the load turned on or off. If turning on the load causes the voltage to drop to zero then replace the fuse.

Sometimes electronics have a high inrush current when first turned on for just a split second. A regular fuse will blow out on a brief overload. To prevent this problem some fuses are rated slow-blow where a brief overload is tolerated but a sustained overload causes the fuse to open. Your "fuse resistor" may in fact be a slow-blow type fuse.

In that case the fuse should be replaced with an inline fuse (they come with inline fuse holders) of the same amperage with slow-blow rated.

Posted on Jan 22, 2009

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  • 1,952 Answers

Check the multimeter

Posted on Jan 22, 2009

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  • 535 Answers

U will nee the multimiter
or see the link
http://articles.techrepublic.com.com/5100-10878_11-5034314.html

Posted on Jan 22, 2009

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  • 2,559 Answers

I think you may be refering to the rectifier
diode,and should be checked as followed.
Rectifier diodes How do you check the fuse resistors on Pioneer DEH - diode.jpg block the flow of current in one direction.
This type of diode is used for converting AC to DC because it will only allow electricity to enter in one direction and the current continues to flow through it to the output side of the diode.
You would no longer get the "alternating current" in the output circuit because now the current is flowing in one direction only (DC).
To test out a diode, first you will have to

set your digital multimeter

to the diode diode.jpg setting, which is usually part

of the Ohms (resistance) section on the meter.

If you are using an analog meter, then set it to the lowest Ohms ω setting. You should disconnect at least one side of the diode if it
is still in the circuit. First check resistance across the diode,
then check again but swap your leads to the opposite side
they were on for the first reading. If you get an open
(meter doesn't move) one way, but some kind of reading
the other way, then the diode is good. If you get a reading
(meter moves) both ways, then the diode is shorted. If you
get an open (no movement) both ways, then the diode is open.

Posted on Jan 21, 2009

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  • 326 Answers

The new unit will not have have the exact wiring harness as it will not wsupport the old.so it has to be repaired replacing the harness with exact will work.new unit harness will not work. thanks.

Posted on Jan 21, 2009

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  • 378 Answers

It will be near to same but if its of same model number it will be exact but if of same company but different model number it will be near to same.so you can adjust as you want but check out the voltages of both the wirring harness before continuing.

Posted on Jan 21, 2009

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I don't know for sure but if you have one try it!
Make sure the Volt-ohm meter is the fuse type!

Posted on Jan 21, 2009

  • Jack Iaria
    Jack Iaria Jan 22, 2009

    Most in dash Music Players are unique to the manufacturer so...

    I'd go to a small store that specializes in installing car music and video systems. There are quite a few of them these days!

    I have been to the one in my town and they explained to me about the connections being non-compatible.

    Since you already have it out or are planning to take it out they will guide you through it at the store and even install it there for a minimal fee!

    Good Luck!

    Hope this was helpful.

  • Jack Iaria
    Jack Iaria Jan 22, 2009

    You must really love this unit to go through so much with us at FixYa here.

    If you want a faster answer consider asking the Experts by starting all over and asking for the Premium Guaranteed Answer which is awesome and guaranteed!

    Hope this helps.



    Good Luck!



    Please rate this answer thanks

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  • 221 Answers

You can use multimeter for checking the resistor as the value of partcular fuse must be written on the fuse on its side .if it shows the perfect value with a multimeter as on the fuse then the fuse is perfectly getting its resistor.only for just checking out if the fuse is proper just check out with continuity as if the light comes on in the continuity its proper if no light comes that clears the fuse is faulty.also you can get the required fuse at local electronics shop.and for required parts for checking as well for the unit you can get at
www.radioshack.com

Posted on Jan 21, 2009

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Fuse resistor i would suggest would blow slower then an actual fuse...not sure if the multimeter question was asked.... checking continuity would be on the resistance scale

Robert

Please rate this solution thanks

Posted on Jan 21, 2009

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  • Roberta Smith
    Roberta Smith Jan 21, 2009

    Ummm is that a ford by chance ?



    Robert

  • Roberta Smith
    Roberta Smith Jan 22, 2009

    i still need to know and i asked earlier is that stereo mounted in a FORD



    Robert

  • Roberta Smith
    Roberta Smith Jan 22, 2009

    If you are getting power to all the connectors on the stereo that require power.... and the stereo won't power up.... you have to face the fact the stereo is defective... repair or replace it



    Robert

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  • 8,619 Answers

Hi!
You can download the manual and see the location of fuse resistor and other components in the exploded views shown in the following manual

http://rc5.ru/upload/Pioneer_DEH-2130R,2100.pdf

Ask for any clarifications

Posted on Jan 21, 2009

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Use an Ohm or volt meter to check for continuity. If there is little or none, then you either need a new or bigger fuse resistor

Posted on Jan 21, 2009

  • 2 more comments 
  • Nate Stansfield
    Nate Stansfield Jan 21, 2009

    the ohneter should be set directly in the middle. If the fuse is good the meter will jump all the way to the right. The fuse regulates higher voltages and protects the system. I always take mine off but I bought a regular fuse link thats like the one on the power wire. If your stereo has another fuse like a car fuse in the back of it you need necessarily need the other one. That's what I do, but that's just me

  • Nate Stansfield
    Nate Stansfield Jan 21, 2009

    If all your fuses and wires check out ok, then ya it's the unit. Probably shorted resistor. Unfortunately about $200 to fix unless your good friends with a tech shop owner.

  • Nate Stansfield
    Nate Stansfield Jan 22, 2009

    Just wondering if you purchase the adapter for the wire harness? This adapter helps you connect ANY stereo to your truck without cutting your trucks wires. This adapter slips onto your factory harness so you don't have to cut your factory wires. You just have to wire the harness to your stereo. ALSO CHECK THE PLASTIC CONNECTOR THAT IS ATTACHED DIRECTLY TO THE BACK OF YOUR STEREO. THEY CAN SOMETIMES HAD BAD CONNECTIONS AND SOMETIMES TO STAY ON OR VIBRATE LOOSE.

  • Nate Stansfield
    Nate Stansfield Jan 24, 2009

    HEY THAT'S WHAT I SAID FIRST!

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Welcome to Fixya! you will need a Voltometer. Replace the Fuse links with a Larger Fuse and Casing. These are usually 20 Amp. Just go 25. Sometimes the Fuse Resistor will go bad on Pioneer units and will need to be Replaced. I only use Pioneer and have had to change them quite a Few Times.

Posted on Jan 21, 2009

  • 2 more comments 
  • Travis Humphries
    Travis Humphries Jan 21, 2009

    They are Faulty if you tested Before and Have no Continuation after them. You can get these at Radio Shack.

  • Travis Humphries
    Travis Humphries Jan 21, 2009

    There are Hundreds of Multimeters and they all have different settings.

  • Travis Humphries
    Travis Humphries Jan 21, 2009

    They are the Same thing as a Fuse. You can get an Inline Fuse and Case from Radio Shack and replace these. If think that they should be 25 to 30 Amp Fuses.

  • Travis Humphries
    Travis Humphries Jan 21, 2009

    You can always check But, If you ever need to get it repaired at a Repair shop they might refuse Since it has been Opened up. Just a Heads up!

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You will want a multimeter. Have you tried changing the fuse resistor?
Thanks,
Lee

Posted on Jan 21, 2009

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