i installed a headunit for my civic,at present,all functions works perfect,the only problem is,when i reverse the car,the image cann't automatically switch to the camera,anyone what's the problem?

---------- Сообщение добавлено 04.05.2012 в 16:53 ----------

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i installed a headunit for my civic,at present,all functions works perfect,the only problem is,when i reverse the car,the image cann't automatically switch to the camera,anyone what's the problem?
the system i installed is below one:
http://www.autoadas.com/honda-new-ci...tem-p-330.html