Just got this off the net....troubleshooting ...might help...
Kenwood equips its receivers with a protection mode to safeguard them. Your stereo receiver is going into protection mode because the receiver has an internal short, a speaker is bad or the speaker wiring has a problem, such as incorrect wire gauge or bad connections. Many of the problems that trigger protection mode can be resolved or at least diagnosed by tech-savvy owners, without bringing your car into the shop.
Step
Reset the receiver by removing the face plate and pressing the "Reset" button with a paperclip. If this solution doesn't fix the problem, continue with troubleshooting and reset the receiver after each step.
Step
Turn off the receiver and disconnect all speaker wires.
Step
Turn on the receiver. If it quickly shuts off, the receiver has an internal short, according to Kenwood. Contact Kenwood customer service to have the unit repaired.
Step
Connect one speaker at a time. If the receiver shuts off after connecting a speaker, that speaker's wiring or the speaker itself has a problem.
Step
Replace any faulty wiring.
Step
Replace a speaker if you have replaced its wiring and your receiver is still going into protection mode.
