I have a kenwood kdc-mp335 and when hooking it up i get no power to the head unit what could this be

Did someone take the time to hook up a back-up camera? Just because the head unit has the capability to be a reverse camera monitor, if there isn't a camera installed it won't work.

Kenwood wiring diagrams are usually on Kenwood website. You just need a jumper harness from the Toyota plugs to your player. A good local ICE shop or car accessories shop could help. Try EBAY?

http://manuals.kenwood.novenaweb.info/languages/EN/support/manuals/KDC-W434-W4034-W4534_INS.pdf

Hope this helps!

Many DIY'S like your self come unstuck when fitting after market equipment The systems are balanced in the ECM so any power feed that affects the ECM will result in problems. I suggest that you have a long talk with an experienced installer before you start or best advice get the shop that sold you the gear to install it for you.

turn on the ignition. if the yellow gets power with the key on, and no power with the key off, it connects to the yellow on the radio. Yellow on the radio is for memory power, to remember your presets and clock.

All aftermarket radios now are all the same when it comes to wiring colors.

black is always common, or ground for all aftermarket radios.

The Kenwood KDC-MP335 is an aftermarket car radio that's available for many cars and trucks. The radio unit comes with a built-in digital clock. If your clock is showing the wrong time, all you need to do is enter the radio's clock-setting mode to correct the time and set the clock.------------------------------------------------------------------------
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Kenwood is not OEM make sure the memory wire gets power all the time.

I am sure that you could make it work but you would loose your message center.

There are 3 things you need to purchase for this install. 1) The factory spec install kit. 2) The factory spec additional wiring harness. 3) Antenna adapter.

Find the easied way to remove the plastic cowling around the radio and ac controls. Usually you can locate screws helping to retain the plastic dash parts. Be careful not to break the plastic dash by taking your time and looking over and over the part ofr connection hardware. Once you have located and removed all/if any screws, carefully pry out on the piece you are removing. There are often metal clips on the back of the piece that also help to retain the dash. Once that is removed, unbolt/unclip the factory stereo and slowly pull it out of the dash. Remove the factory harness from the backside of the factory stereo. DO NOT CUT THE HARNESS!! The wiring harness you have purchased is designed to plug and play into the factory harness. All you hae to do is color match the Kenwoods harness with the one you purchased. When wiring the two harnesses together use connectors **** a **** connectors, crimp connectors so forth and so on. If there is wiring you will not be using, take some electrical tape and tape the bare wire. We don't want a short. Once you are sure and have doubled checked that all the wiring is secure and matched, reverse the order of disassembly.

The plastic install kit should replace the factory radio size difference. Just remember to take the metal sleeve tha came with the kenwood and install it into the plastic install kit via the instructions provided. Slide the Aftermarket stereo into the sleeve you just installed. Then you are ready to make all the needed connections. Before you reassemble everything make sure to do a test run with your stereo. If all is well reassemble and jam on.

lower volume in future.