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Password protection on kenwood is very good, you might need to pick up another head unit. Also after inputing the pass code you need to hold the fast forward or skip button to activate the code. I am verry familiar with that head unit and I dont know of any end arounds to bypass the security code. Get ahold of the origional owner and get their passcode or replace the headunit.
If your headunit is in protect mode, the most likely cause would be the speaker wires are shorting somewhere. The most likely place would be the connections behind the stereo with an inferior installation. The next most likely place would be at the speaker connections, especially if the speakers were recently replaced.
Some headunits (kenwood for example) you can simply just ground the green wire and all is well. Some other headunits (clarion for example) have to see a change in the status of the wire and need to be on a switch to work. A simple toggle will work. You need to go from open to closed (to ground) on the switch for this to work.
There is usually a green wire on the deck. And you usually have to ground that green wire, and usually have to use a switch due to everytime you turn the car off the units brake switch thing has to be reset.
Normally if you have a factory ampped system and you remove the factory headunit you lose things like the factory sub. There are only 4 outputs on an aftermarket sub. In order to make your subs work you will need an aftermarket amp.
Don't bother - just ground the wire that ties into the brake. This will allow you to watch while you drive. You may need to put a switch on the wire (so you can break the connection if need be - Jensen for one requires an on-off-on sequence with the brake, and you can duplicate this with the switch). Overall it's easier that tapping into the brake wire and gives you more flexibility with the system as well.
You can try it, but I think you might need a media expander/controller. I see some going for around $100 on Ebay. It allows you to add and interface many component to your deck. But make sure the deck ready to control it. You can tell by the label on the deck(Ipod ready, XM ready, Sirius ready, Changer ready....ect). Goodluck.
jensen is not such a great brand for indash. if you have the receipt or warranty you might want to return it and get yourself a new one. I know this because when i bought my phase linear i didnt want to eject the cd and the guy told me that they come very defective sometimes