AVN30D Backup Camera - Aftermarket

[TRD2007RED]

My Taco is installed with a Eclipse AVN30D. I am wondering if anyone know the specification of the 4 pins backup/reverse camera plug. Trying to add a backup camera to it but not willing to pay for the $200.00 asking price. Logically speaking, any 12volt aftermarket security cameras should work. But when I try to connect it up, there was no picture. My multimeter said it has a 4.88 volts output. Any ideas? Have looked into the 4pins Eclipse BEC106 and their color scheme are Yellow, Red, Black and White. The last two were joined after coming out of the HU. I assume the Yellow wire should be the Positive for Video, Red is the power supply and the Black and White are for the ground. Any info will be appreciated.

Finally get it to work with a after market backup camera from Fry's Electronics for $50. The power source is from the backup lights, 12 volt, b/c the camera power output from the HU is only ~5 volt. The location is kind of problematic since the size is an issue. However, I managed to install it at the square hole right above the license plate. Not noticeable if you are not looking for it.