2010 Toyota Sequoia Rear Camera

My Camera on the 2010 Toyota Sequoia needs replacement - the dealer want $500 for a new camera, so I decided to buy a cheaper one online and install it myself, all is going well from an installation point of view but now i am at the wiring stage. There is a connector at the cars camera with 4 wires, i assume 2 wires are power + - and 2 wires are the video feed back to the screen. The problem is when i scope out the wires I can not detect the 12 Volts? I have the car running and in reverse to enable this but there is no voltage on the wires? Does anyone have the schematic for the harness or any ideas that could help? I have checked the fuses and all looks ok, but not 100% which fuse it is. Thanks for your help

I believe the black wire pin 4 is the camera power wire (6 volts). Use a volt meter to confirm voltage. The white wire pin 3 is ground. The red wire pin 2 is video + and blue pin 1 is video -. Your new camera may need 12 volts to work so connect it to the reverse wire blue in black 8 pin connector in the driver's kick panel.sparky