Question about Kenwood Kdc448u

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Kdc 448u has power but will not work

Used continuity tester to test fuse on radio, ground, remote wire, etc... all have power. Power is running back to the amp for the subs as well BUT the actual stereo unit has no power. No red flashing light (when you take the face plate off that light that blinks) and the face plate has no power. Just had the engine swapped out and it worked perfect before hand. Car sat for about a week or so with no battery in it I dont see this being a problem? It worked perfect until now. What the H

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Larry Spears

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  • 625 Answers

If you are sure that the unit has power, try resetting the unit. The reset button is on the left of the plug behind the faceplate.

Posted on Aug 21, 2012


5 Related Answers


Perry Mellott

  • 147 Answers

SOURCE: No Power to face plate

Hello James,You missing a Major supply to the Face,Take a Test lite and Ck to see if your getting voltage on the Memory wire Also ck Fuses ttech

Posted on Jul 20, 2007



  • 102 Answers

SOURCE: Power problems with my kdc-x789

It should be taken back to the installer.

Posted on Oct 06, 2007


  • 624 Answers

SOURCE: power to stereo none to unit

There is a ribbon cable that goes from the display to the main board of the radio that may be bad, if you have everything connected properly and all you get is the red led, this is a possibility. No way for anybody to know if you have it wired wrong if they can not look at it themself.

The red wire is for power when the key is on, the yellow wire should get power all the time, the black wire is ground.

If you have those correct, the radio should at least turn on. If you have these right, you may need a new ribbon cable. The connector that interfaces with the detachable face must also be taken off the old ribbon cable and put on the new one, or get a new connector and just replace it. The ribbon cable does not come with that connector. It is soldered on the ribbon cable, so if you are not very good with a soldering iron, you should have a service center do it for you.

Let me know if you want the part number for the ribbon cable and/or connector, I can get those for you.

I can not guarantee that the ribbon cable is the problem, or that it is the only problem, but it is the most likely problem with that model number of Kenwood. I have repaired many of them, so I have a good idea what causes most of the problems, but I have seen times when the usual suspect is not the problem and something else like the LCD in the face is bad, or the IC that controls the display is bad. Even a voltage regulator on the main board of the radio can be at fault as well. There are probably about 10 different things that can cause that one problem, having an experienced technician is always the best way to determan the problem with certainty.

Let me know if I can be any more help for you.


Posted on Jul 25, 2008


  • 2 Answers

SOURCE: kenwood KDC-MP438U acts as if there is no power to it,dead nothin

The speaker wires are very sensitive. You need to make sure that they are not grounding out. Once the unit senses this it will shut off. Pull the plug out of the back and start over.

Posted on Jan 05, 2009


Larry Tezekjian

  • 117 Answers

SOURCE: cd player plays, but no sound comes out of speakers.

Look at the enwood. I bet you have the remote wire hooked to the blue wire insted of the blue/white wire. The blue wire goes dad when you play a cd as it is for a power antenna. The blue/white wire is your amp turn on.

Now, if you do not have a blue/whie and only blue, then obviously that circuit in the radio is bad in whch case your only other option s are either connecting it to an accesory fuse or using a toggle switch connected to power.

Larry T
Winona Lake, IN

Posted on Jan 28, 2009

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Buy a cheap 12v circut wire tester and see if your getting juce from the remote wire. Also check fuses. If no juse just tap the radio acc wire and run it to the remote amp wire. Also check your amp ground. Infact first bridge your 12v amp + wire to the remote wire with some pliers or a short wire and see if the amp comes on. That will make sure the amp is not the issue.

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I always check for a ground wire issue first. this is the most over looked yet simple issue to fix. use a volt meter and check at the bulbs with the light switch on and see if power is getting to it. if not then its either a fuse. yes pull the fuse and test it ! simple continuity tester will work. if its good the replace the headlight switch. if power is there then check ground wires. (note check for power using a good ground on the tester not just the wires on the socket)

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2 ways you can do it> 1 find the fuse and pull it out but only if it is for the antenna or you can disconnect the antenna wire from the back of your radio, it is normaly a blue wire run with the power harness. Red is 12V. Black is Ground 0V. Yellow is Remote, it works with an AMP if you have one installed. Blue is normaly the power antenna. hope this helps> test it first by pulling the fuse to the radio and if the antenna does not operate then the power is from the radio

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You could test the point that power enters these devices when set to on for the presence of 12 -14VDC, while connecting the other lead of the tester to a point that is grounded. If your meter or tester indicates power is present, then it is indeed a ground problem. You'll need to figure out a way to restore the ground path to the device. If however, there is no indication of power, you'll need to test the wire(s) going back to the power source - fuse block, circuit breaker, fusible link, etc.

Don't forget to look for secondary fuse blocks under the hood, under a seat in the cabin, etc. Consult your owner's manual for the location of these power points and circuit safety devices.

Good luck!

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Kenwood eXcelon radio problem I have 2 subs in my civic that work perfectly fine but i recently tried to add another amp to run my front door speakers seperately. I spliced the remote wire between the two...

Cut the remote wire from the radio.
install a relay in line
the relay will have 4 or 5 terminals
connect terminal 87 to battery power and fuse it at 3amps
connect terminal 86 to the remote output from the head unit
connect terminal 85 to ground
connect terminal 30 to your amp turn on wires
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I am trying to put a sterio in a mitsubishi varada 98 model and we cant wire it proply

I guess the problem is trying to figure out which one is the power, accessories, ground, speakers, etc.

1. Get a DC tester, the ones which has a bulb on the end. Or a multimeter.
2. Make sure you connect the clamp to ground, usually the door hinges is a good option.
3. Turn everything off, take the keys off.
4. Start testing each of the cables. The one that lights up with everything off is the power.
5. Now tape the power so you don't make contact with metal.
6. Turn the car key to ACC position.
7. Start testing with the DC tester. The one that lights up now is the ACC.
8. Now the negative is usually black.
9. Now you can run new speakers cables from your new radio.

If you are installing an amp, you will just have to run the remote from your new radio to the amp to turn it ON.

The AMP installation is different from the radio.

Hope it helps.

God Bless You!!

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I tried hooing up my amp and subs but i get

make sure u have

power source with inline fuse working.
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and make sure you have rca running to the sub input on your radio.
and your speakers are connected.

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New KDC-135 has Power but Faceplate won't light up

you shold always twist the end of the wiring together and tape them never use connectors, remove the connectors and twist the wires driectly to each other and tape them wiht electrical tape, the connectors almost always can not deliver the proper voltage..

Did you make sure you have the yellow to a constant connect wire and the red to a turn on?if not this can cause the radio not to work......

you can test wich is wich by turning the key off and putting the yellow to the one you think it is and red to the one you think it is, if you have have it right you will hear the CD player make a click run sound...... if not you will not hear any thing.

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  1. Check the wiring of the new radio installed as follows..
  2. Disconnect battery ground
  3. verify radio ground wire is grounded to metal
  4. verify radio hot wire (normally red and thick) is connected to a power source that is off when the ignition key is in the "off" position.
  5. verify that the always hot wire is connect to a constant 12v power supply even with the ignition off.
  6. make sure the pwr antenna wire if not used is taped at the tip and not touching any metal.
  7. verify that all speaker wires are connect correctly and not shorted to ground.
  8. connect battery ground you may get a small spark if your courtesy lites work.
  9. start engine verify your battery is charging by disconnecting the battery ground cable while the engine is running, it should continue running if it don't, alternator maybe bad.
  10. If it continues running problem solved..

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