Hopefully someone can help.

My old mans van has a kenwood head unit in it, and recently it decided to turn off and stay off. I thought that maybe a fuse had blown so i took the head unit out and checked the fusers. All are fine.

I plug the head unit back in and it turns on and begins working again. I then start the van and the head unit once again turns off, and goes back into safety mode I guess, as I have to disconnect, than reconnect the the head unit to work again. Will work first time after reset in ACC but once the van is started its dead again.

Any Ideas???

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could be an issue with the constant wire maybe? have u had a look over the wiring? checked nothing is exposed? checked the van fusebox? surely there has to be a reasonable resolve to this problem .