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 the manual to disactivate the secuirity code system to no avail, also to reset the sytem but no solution yet

ok I just found this info online and they say it came from the service manual for that stereo so I hope it helps:

You will need a Kenwood RC-410 remote control. This remote works on KDC-519, KDC-X859, KDC-319, KDC-4019, KDC-MP919, KDC-X759, KDC-419, KDC-X459, KDC-MPV619, KDC-MPV7019, KDC-2022, KDC-2022V, KRC-435, KRC-535 and KDC-X959

To reset the code do the following:

1) Turn on the car.
2) The faceplate rotates out and the CODE - - - - prompt appears.
3) Press >>' and Auto keys simultaneously on the faceplate and hold for 4 seconds. (If the faceplate rotates back into the console push on the upper left top edge of the faceplate and it will flip back around. Press the Eject button and then try it again.)
4) The screen will still say CODE, but the - - - - will disappear! When this happens press the 5 key on the remote twice and it enters a K on the display on the faceplate. Hit the >>' key on the faceplate.
5) Press the 2 key on the remote three times and it enters a C on the display on the faceplate. Hit the >>' key on the faceplate.
6) Press the 2 key on the remote once and it enters an A on the display on the faceplate. Hit the >>' key on the faceplate.
7) Press the 7 key on the remote twice and it enters an R on the display on the faceplate. Hit the >>' key on the faceplate.
8) The radio goes into All Off mode and you are set! Hit the SRC button on the faceplate to select CD, Radio, etc.

Above information source = http://techbybucky.blogspot.com/2008/01/how-to-reset-security-code-on-kenwood.html

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;

• 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;

• 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.

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.

HI ,i NEED HELP FOR THE SECUIRITY # RADIO KDC-MP638,THANKS

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

this is the security setting that is pretty much on all kenwood head units. you could talk to kenwood about this and see if they can help. if you dont have the code you're stuffed

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

how do i find the code anr]d enter it

for your kdc-mp528 will work whith code KCAR entered from the remote

Common Kenwood Security Codes
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.
Entering Your Kenwood Security Code
If the car battery fails or is disconnected, the Kenwood will ask for the security code.

The procedure to enter your security code differs on various models of Kenwood car stereos. Here are three of the more common procedures:

Type 1
During the code request mode, while holding the DISP key depressed, press and hold the Volume UP or DOWN key for 3 seconds until the "..." display disappears.
Enter the security code using your Kenwood remote.
Type 2
Press and hold the "Auto" button and "Track up" (next track button on the right) on the face of radio at the same time until the four dash lines disappear.
Enter the security code using your Kenwood remote.
Type 3: Model# DPX-4020 and DPX-4030
Press and hold the 1 then the 6 preset keys until the display shows the letter 'C'.
Enter the security code using your Kenwood remote.
Entering Letters on your Kenwood Remote
To enter a letter using your Kenwood remote, press a button once for the first letter, twice for the second letter, and three times for the third letter -- then press the Track Up or Next Track key to send the letter.

To send the letter 'A', press the 2 key once and then press the Track Up key. To send the letter 'B', press the 2 key twice and then press the Track up key.

Finally, when you are done entering all of the letters, press and hold the Track Up button for 3 seconds.

The key sequence to enter the security code KCAR is:

5
5
Track Up
2
2
2
Track Up
2
Track Up
7
7
Track Up
Your Kenwood should then enter tuner mode.

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.

i hope this works for you.