Question about Kenwood KDC-MP235 CD Player

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Kenwood deck reads protect and won't function

Installed a used deck in new vehicle. worked fine until we hooked up new speakers, now deck reads protect and won't play

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  • 233 Answers

You have one of your speaker wires shorted out to the body of the car somewhere, or the speakers that you installed are bad. That is the only two reasons it will go into protect. Correct the problem, then reset the deck - it should work fine.
Kenwood builds this feature in to protect the outputs - so they dont burn up in the case of shorted speakers or wiring.

Posted on Jan 17, 2009

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I have a kenwood kdc bt43u and transferred it, with my amp and rear speakers, to an identical vehicle. It all works fine until i use bluetooth. sound only comes from the front factory fitted speakers


Not quite sure what you are saying here but I am going to take a stab. If I am filling in the gaps but are the rear speakers wireless? If this is the case then they are not paired with the speakers but with your receiver deck. You will need to pair the speakers as well before it will play through them.

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SP OFF mode?


if you turned it on without speakers hooked to it you may have blown the speaker output amps or if the end of the amp remote wire touched a ground you may have burned a trace on the board did you here it play at the pawn shop? or did it just light up? sometimes the people at the pawn shop think if the unit lights up it is working and sometimes they check them is just hook power to them without speakers if so this can blow the speaker output I would take it back to the pawn shop

Jan 29, 2014 | Kenwood KDC-MP235 CD Player

1 Answer

I have protect displaying on my stereo


This is most likely due to speaker, speaker wiring, or faulty headunit problems. To troubleshoot this you need to slide the deck out and disconnect only the speaker connections. Turn on the stereo and if it still says "protect" then it's most likely a faulty deck. Otherwise, repeat the procedure of plugging in one set of speakers at a time until the "protect" comes back on. This is now your faulty speaker line. This could be the wiring or the speaker causing the problem so you could try swapping a speaker that you know works. If the problem persists you'll have to run new wire in place of the faulty line.

May 04, 2011 | Kenwood KDC-3031A CD Player

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This deck is in protect mode


A couple things may cause this:
If a speaker wire shorted out (either a voice coil or the wire itself is grounded; touches the vehicles chassis ground)
Solution: disconnect each speaker from the deck and see if it turns back on. 90% of the time thats the problem.

It could be overheating.


Jun 03, 2009 | Kenwood KDC-X590 CD Player

1 Answer

This deck is in protect mode


This is what the owners manual says about Protect mode......

The speaker wire has a short-circuit or touches the chassis of the vehicle, and then the protegtion function is activated. Wire or insulate the speaker cable properly and press the reset button.

Mar 13, 2009 | Kenwood KDC-X590 CD Player

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check for any loose connections at the fuse block or a loose fuse
using an ohm meter would help
check the harness on the back of the radio for loose connection
bad igntion switch, again an ohm meter would help !
what type vehicle ?

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Here's the quote from the manual regarding "dcer": "The speaker wire has a short-circuit or touches the chassis of the vehicle and then the protection function is activated. Wire or insulate the speaker cable properly and press the reset button. If the "PROTECT/DCER" code does not disappear, consult your nearest service center "

I believe the manual can be downloaded from crutchfield .com after you go to the Kenwood KDC-138 page on their website. The reset button is either on the lower left of the face or, removing the face, on the lower left of the body. Hope this helps you.

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i had the same problem and i just disconnect the battery and and reconnect it and everything works fine!! try it

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My stereo is flashing the work "PROTECT" across the front


In a Kenwood deck, "PROTECT" usually means that one of the speaker output wires is shorted. The first thing to do is pull the deck and inspect the wiring at the back, making sure there aren't any pinched or exposed wires. If a speaker wire is pinched against the deck chassis, or bare wire is touching dash metal, it can cause your problem. If you don't see anything obvious, disconnect all speaker wires from the deck, then turn it on. If it still flashes "protect", then you have a defect in the unit. If not, then re-connect the speakers one at a time until you find the one that causes it to go into Protect mode. Usually if you don't find a pinched or shorted wire behind the radio, the problem can be found at the speaker itself. This is especially common if you've installed after-market speakers; if a speaker terminal connection has come loose and is now touching the speaker basket or mounting surface, it will shut down the deck.

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