A speaker wire has a short-circuit, crossed, or touches the chassis of the vehicle it activates the protection mode function.
? Wire or insulate the speaker cable properly and press the reset button. If the "PROTECT" code does not disappear, consult your nearest service center.
I have attached a link for you which is for a free Kenwood KDC-MP443U instruction manual download. Nice receiver by the way!
Kenwood KDC MP443U Instruction Manual
SOURCE: Protect mode Kenwood KDC MP438U in dash reciever
Anytime there is a short circuit or your battery down low enough you will recieve this signal. If you press the little "reset button" using a small pin or screwdriver your unit should reboot without the "PROTECT" signal. If seeing this "PROTECT" sign is a result of jumping your car, this will fix it. If the signal persists, then there is still a short circuit and you need to check your connection with the battery. Most likely it is touching the chasis or some othere metal.
SOURCE: Kenwood KDC 241 SA car radio 'Protect'.
you could have a shorted speaker wire, a blown speaker; or the output ic in the deck itself could be bad.
SOURCE: how can i remove protect mode on my kenwood
find the lil hole in front of the face use a paper clip to reset it if it keeps on doing it you got a speaker going bad
SOURCE: Kenwood kdc-bt742u flashing protect and no sound
If protect is coming up on the display, it means the system is detecting a short somewhere on one of the speakers and so is turning the amp off to avoid damage.
Check all the connections at the back of the amp to ensure they are not shorting, and at the back of each speaker, if nothing is found there, check each wire for damage, or a bare wire touching the body of the car
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