Question about Kenwood KDC-MP4028 CD Player

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Won't turn off or on automatically

My kenwood stereo was installed and I have to manually turn it off and on. How do I fix it to turn on and off with the car?

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The blue wire (acc./remote) is not connected to the ignition. It must be directly wired to the power which has power all the time. The blue wire needs to be connected to a power source where it turns on and off when the key is turned on and off

Posted on Jan 16, 2009

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Puull the radio out and make sure all the colors match up. it sounds like your red wire(constant power or ACC) is hooked up to your yellow wire(BATTERY)

Posted on Sep 28, 2008

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You must have the yellow and the red wires tied together on a constant voltage source.

Only the yellow wire should be on a constant voltage source.

The red wire should only get voltage when the ignition is turned on or in the acc. position.

You need to rewire the red wire on the radio.

Let me know if it helps.

Posted on Jun 19, 2008

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SOURCE: Car stereo wont stay on, goes off when a/c is turned on

You have some connection problem 100%.The radio it should be good if does turn on.

Posted on Jan 06, 2010

  • 2 Answers

SOURCE: My Kenwood car stereo keep falshing the word "Protect" how to fix

in front of your #1 preset button there is a reset button push it with a pin. if you made a pass # put it in if not page 12 show you how to make one if you want. reseting it should make it work if it dont you have a short somewhere start from scratch buy taking it out. I suggest you dont make a password till the short is gone. Mine did the same thing but because i was pulling to much power on starting my car with my amps.

Posted on Apr 19, 2010

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Posted on Jan 02, 2017

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1 Answer

What is EC code in kenwood a.c ?


  1. If your car battery died, your Kenwood stereo will ask you for a code. There are various ways to enter the security code; this depends on the model of your Kenwood stereo.
  2. Look in your manual and see what the security code is for your particular Kenwood stereo. There are common security codes on many Kenwood stereos. Kenwood claims security, but its stereos have many of the same security codes. Here are three common security codes: 1-2-3-4 (a code many Kenwood owners use), 3-0-5-1 (a common security code in Kenwood manuals) and KCAR (works on some Kenwood stereo models). You should have a code within the pages of your manual. Luckily, many Kenwood stereos have the same security codes.
  3. Enter the security code into your Kenwood radio. Method #1: During the code request mode, while holding the DISP key depressed, press and hold the "Volume UP" or "DOWN" key for three seconds until the " ... " display disappears. Enter the security code using your Kenwood remote. Method #2: Press the "Auto" and "Track Up" button on the face of radio at the same time until the four dash lines disappear. Enter the security code using your Kenwood remote. Method #3: Press and hold the "One" then the "Six" preset keys until the display shows the letter "C." Enter the security code using your Kenwood remote.
  4. Tips:
  • If you did not have your manual, try the most common codes for Kenwood stereos. If those codes don't work, you can also buy your Kenwood stereo code online. There are places online that will sell you the security code to your Kenwood stereo.
  • Keep your security code and this information in a safe place.

Here is a link to a more detailed site Good Luck

May 18, 2016 | Kenwood Car Audio & Video

1 Answer

Kenwood car stereo face got wet and now won't work, how do i fix it?


If the unit is already fried you may try to soak it in the highest alchol % of rubbing Alcohol for a day then allow the unit to dry Which should happen within a day or so because of the evaporation rate of the alcohol. This should remove the internally locked water and allow for the unit to resume Function without internally shorting.

Jun 06, 2013 | Kenwood KDC-MP242

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My kenwood kdu-u7053bt won't keep it's memeroy. Keep going to demo mode when I turn the car on.


go back to the stereo shop and make sure they connected the memory wire on the unit to a constant 12v source

Feb 03, 2013 | Kenwood Car Audio & Video

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The kenwood KDC-MP333 in my truck is connected to a set of kenwood speakers. But when I turn it on they won't work the stereo still shows the display but when I turn the stereo on it makes a sort of...


Disconnect the speakers and try it with another speaker or speakers not in the truck. If it works, the speakers or the wires to them are messed up. If it doesn't you probably damaged the output capacitor in the radio by turning it on without speakers attached. Realize that the speakers are part of the radio circuit and act as resistance. Without them, there is no resistance and it puts a strain on the radio.

Jan 02, 2013 | Car Audio & Video

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How to install a kenwood kdc-135 car stereo


This is a link to Kenwood for your KDC-135 Owners Manual. Page 15 has the wiring diagram and pages 16 and 17 cover physically installing the unit.
http://www.kenwoodusa.com/UserFiles/File/Global/Consumer/Manuals/KDC-135.pdf

Nov 17, 2009 | Kenwood KDC-135 CD Player

1 Answer

Car stereo wont stay on, goes off when a/c is turned on


You have some connection problem 100%.The radio it should be good if does turn on.

Jun 06, 2009 | Kenwood KDC-MP435U CD Player

1 Answer

Mp2035 cd player will not turn on.


My hunch is that the fuses blew. When you cut all three at once you shorted the battery to ground and most likely blew out the fuses. Check the fuses and let me know. That is my best guess. Good luck
-Andrew Hawkins

Jun 10, 2008 | Kenwood KDC-MP2035 CD Player

6 Answers

Security Code for Protect mode


Turn on the car so the radio is flashing "Protect." Look on the front / removable face of the stereo. On it you will find a small round hole - that's a reset button. Find a small paper clip, unfold the clip and stick it gently into the hole. The "Protect" will stop flashing, and Kenwood will be displayed. Unfortunately all your settings/presets will be gone, but at least the stereo is working again!

Apr 30, 2008 | Kenwood KDC-W3534A CD Player

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