20 Most Recent Kenwood KDC-MP638U Car CD/ MP3 Player Questions & Answers

there is probably a fuse on the back of the radio.

Kenwood... | Answered on Feb 18, 2011


Kenwood... | Answered on Feb 10, 2011

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.

Kenwood... | Answered on Feb 04, 2011

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.

Kenwood... | Answered on Dec 15, 2010

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

Kenwood... | Answered on May 14, 2010

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

Kenwood... | Answered on Feb 11, 2010

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

Kenwood... | Answered on Dec 06, 2009

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

Kenwood... | Answered on Sep 21, 2009

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.

Kenwood... | Answered on Aug 08, 2009

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

Kenwood... | Answered on Jul 29, 2009

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

Kenwood... | Answered on Jul 14, 2009

Not finding what you are looking for?
Kenwood KDC-MP638U Car CD/ MP3 Player Logo

31 questions posted

Ask a Question

Usually answered in minutes!

Top Kenwood Car Audio & Video Experts


Level 3 Expert

85239 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8984 Answers

The Knight
The Knight

Level 3 Expert

76407 Answers

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

Answer questions

Manuals & User Guides

View Most Popular

Kenwood Car Audio & Video

  • Kenwood Car Audio & Video

Most Popular Question

ipod no longer plays deck

  • Car Audio & Video