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when your car is on, turn the stereo off. you should be able to access a menu somehow when the stereo is off. in that menu, you should have the option to toggle the aux source on or off. simply switch it to on, then turn the sterreo back on, and hit the source button. it should now be ready to go.
"Protect" isn't for security on a Kenwood; it's caused by a problem with the speaker output. There may be a defect in the CD player, or you may have a blown speaker or a shorted speaker wire in the vehicle. Try disconnecting all the speakers and see if the unit still shows "protect" when you turn it on. If it still shows the "protect" message with no speakers connected, the unit needs to be serviced; if not, re-connect the speakers one at a time until you find out which one is causing the problem.
From the user's manual (pg.23):
1. Select the Demonstration Mode. Push the Control knob towards [FM] or [AM]. Select the "DEMO" display.
2. Set the Demonstration Mode. Press the Control knob for at least 2 seconds.