Question about Kenwood KDC-MP638U Car CD/ MP3 Player

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Kenwood mp638U sound system problem

I have the kenwood MP638U installed and on the tuner source the audio works fine. when i switch it to the cd function, sound only comes through the subwoofer. i messed with the audio settings and couldn't fix the problem. any ideas?

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Try to put the remote of the facory amp to ign power

Posted on Jul 14, 2009

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Posted on Jan 02, 2017

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How do i bypass security code on kenwood stereo model kdcmp638u


You will need to visit an Authorized Dealer or service center for that product to get the unlock code reset. You can find a dealer listing on their website, or call them.

Jan 14, 2011 | Kenwood KDC-MP638U Car CD/ MP3 Player

4 Answers

2ooo Ford Mustang,Got MP538U TUNER work. cd look like it was playin no sound though.Exchanged it for MP638u.SAME BULL. cAR GOT ripped out mach system. Carstereo wires without harness


Hi,

If you are wiring a Kenwood KDC-MP638U to a 2000 Ford Mustang, then below information may be of help:
  • to my knowledge, the original stereo unit uses 2 8pin connector and a single 7 pin connector;
  • if the connector with the harness has been cut, then wire splicing may have to be used based below;
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  • If you are using external amplifiers, then it is possible to trigger/switch them with the blue/white wire and their RCA INputs connected to the appropriate RCA OUTputs of the Kenwood;
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  • Additionally, the KDC-MP638U has built-in USB port/interface.
  • Incidentally, if what was previously installed is a full Mach system, pls be informed that there are seven (7) versions from Mach 1000.0 to Mach 1000.7, which one was installed?
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Oct 17, 2008 | Kenwood Car Audio & Video

1 Answer

My system is blocked on secuirity code enter when i switch it on and i don't have the code. My car stereo is a Kenwood KDC-MP638U. happened when i removed it from one car to another car. have tried using...


Many Kenwood radios are configured with the same security codes:

  • KCAR - This seems to be a "backdoor" to some Kenwood models.
  • 3051 - This is the security code which is printed in the manual of many Kenwood models.
  • 1234 - This is a security code commonly chosen by Kenwood owners.
A Security Code Bug in Some Kenwoods

There is a reported bug in the security code handling of some Kenwood stereos. In models with thie bug, the security code is stored incorrectly. The workaround is to enter the wrong security code.

In models with this bug, you have to decrement the third character of the security code by one. If your security code was 1111, you would enter your security code as 1101. If your security code was 9999, you would enter 9989.
Finding the Kenwood Security Code

There are backdoor codes for each Kenwood car stereo, based upon the model and the serial numbers.

These backdoor codes are closely held secrets. Outfits like Car Audio Accessories UK will sell you the code for your radio for £20.
Sending your RadioBack to Kenwood

If all else fails, you can send your stereo back to Kenwood to have the security code reset.

Dec 15, 2010 | Kenwood KDC-MP638U Car CD/ MP3 Player

1 Answer

Getting power but faceplate not lighting up.


you may have bad solder connections on some surface mount resistors inside the deck.

May 13, 2010 | Kenwood KDC-MP638U Car CD/ MP3 Player

1 Answer

Ipod no longer plays on deck


good day,you might have a defective cable that links the ipod to the stereo, try replacing it. hope this helps, have a nice day

Feb 10, 2010 | Kenwood KDC-MP638U Car CD/ MP3 Player

1 Answer

I cant get the aux menu on to activate aux


most head units you need an accessory like a disk changer pluged into it to get aux to work.

Dec 05, 2009 | Kenwood KDC-MP638U Car CD/ MP3 Player

1 Answer

Display on kdc-mp638u not working


These units are pretty cut, and dry.. Basicly the only thing you can check for yourself is connection. If the connection between the face plate, and the deck is good, and tight then you have one of 2 problems.
1) Bad face plate. Fix= $90-$130

2) Bad connection to the board on the radio Fix $60-$120

There is however a VERY off chance the processor is jumbled up, and wont cost you a dime to do a cold reset, so give it a shot.

To reset this unit simply remove the face plate, and locate the rest button. It is very small, but easy to find. Just use an ink pen or something of similar size to push the button.

Aug 07, 2009 | Kenwood KDC-MP638U Car CD/ MP3 Player

2 Answers

My kenwood will not save any tuner stations or eq stuff??


check your "constant power" (battery power) lead with a meter and make sure it's got 12v dc power with the key "out" of the ignition. If there's no power check the vehicles fuse and the radio fuse. Hope this helps

Jul 26, 2009 | Kenwood KDC-MP638U Car CD/ MP3 Player

1 Answer

Protect message on screen


When 'Protect' shows up when you turn on a kenwood deck it means there is a speaker short somewhere that it is detecting. Make sure all connections are insulated and that none are accidentally touching the chassis of the vehicle.

Jul 06, 2009 | Kenwood KDC-MP638U Car CD/ MP3 Player

2 Answers

Amp and subs turn off when i go from tuner to cd or ipod


you need to use a "blue with white" wire as remote to turn on the amplifiers.

Mar 23, 2009 | Kenwood KDC-MP638U Car CD/ MP3 Player

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