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This usually indicates a protection mode...in which the system is shutting itself off to prevent damage. Check all your wiring including speakerwire and make sure no exposed wires are touching, connected in reverse polarity, etc.
First, check all of your speakers and speaker wires for shorts and/or grounds. If they all check out, try resetting your deck. If that doesn't work, you probably have a bad output ic inside of the deck.
If it is in protect mode then you have a short in your system. A blown speaker will cause it to go into protect mode, also if there are any power supply problems like a loose ground wire or a sketchy connection at the wiring harness it will also trip. My advice is pull the deck check power supply and ground and wiring harness, if it doesnt go away you know its the speakers.It may however need to reset and you will need to unplug the wire bundle from the deck for a moment before getting into the messing with the speakers or wires. Hopefully that cures it so test it and see. Okay if that didnt fix it then you likely have a blown speaker somewhere in the vehicle so get that replaced and rock on.
protect mode means some speaker wires somewhere in the car are grounded out or are crossed... find the short and it will fix the problem. try testing all of the speakers one by one from the wiring harness... you'll find the problem. Good luck.
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.
this is very simple to do just take your face plate off and were you see a red light blinking just get like a bobby pin or something and pit it through the hole and the radio will reset and that should fix your problem
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.