I got a new battery put in my car and now the radio is asking for a security code. I have a Kenwood KDC-MP342U...Please help

You may have to contact the manufacturer for details on that. Check in your owners manual for the phone number of their customer service. I had a similar problem after changing battery but found the answer right in the manual. Mine was a Kia.

The wiring diagram is on page 20 of the manual.

Please let me know if you have any questions, and thanks for using FixYa.

2001 Pontiac Grand Am Car Audio Wiring Diagram kenwood kdc-mp342u
Car Radio Battery Constant 12v+ Wire: Orange yellow
Car Radio Accessory Switched 12v+ Wire: none
Run a wire to the fusebox for switched power. red
a 14 gauge wire will do--use a 15 amp fuse
Car Radio Ground Wire: Black/White black
Car Radio Illumination Wire: Gray (tape this wire off) none
Car Stereo Dimmer Wire: Brown (tape this wire off) none
Car Stereo Amp Trigger Wire: Pink blue
Left Front Speaker Positive Wire (+): Tan white
Left Front Speaker Negative Wire (-): Gray white/black
Right Front Speaker Positive Wire (+): Light Green gray
Right Front Speaker Negative Wire (-): Dark Green gray/black
Left Rear Speaker Positive Wire (+): Brown green
Left Rear Speaker Negative Wire (-): Yellow green/black
Right Rear Speaker Positive Wire (+): Dark Blue purple
Right Rear Speaker Negative Wire (-): Light Blue purple/black

Amplifier Mounted behind trim in the left side of the trunk.

If you can, try contacting the previous owner to see if he/she knows the code.

You can enter a 4-digit security code which must be used when the unit is removed from the vehicle, or the constant power source is disconnected from the unit. When constant power is restored to the unit, the security code must be entered before the unit becomes operational.
If the code is lost or forgotten I am afraid the unit has to be re-coded by a Kenwood dealer.
Good luck with it.

You can enter a 4-digit security code which must be used when the unit is removed from the vehicle, or the constant power source is disconnected from the unit. When constant power is restored to the unit, the security code must be entered before the unit becomes operational.
If the code is lost or forgotten I am afraid the unit has to be re-coded by a Kenwood dealer.
Good luck with it.

ask your friend for the code. unless the radio is stolen .

hold down preset 3 & 6 + reset
press preset 1 - shows dc err
press preset 1 - shows dc ok
press preset 2 - shows dc 2-4
press preset 2 - shows dc 2-0
then unit should be ok with eeprom reset

It actually IS very common for people to change a battery in a vehicle, as they OFTEN develop problems.

Please CLICK HERE to see a tip on bypassing Kenwood security codes, and how to obtain the code by contacting Kenwood or an authorized Retailer.

Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.

first, check your speakers and speaker wires for shorts, then disconnect power to the radio for a few seconds and reconnect it. if that doesn't work, then you probably have a bad output ic.