You guys are going through the AUX inputs which will lock out the video when the car is not stopped. Stopped = 7AT in P and e-brake engaged. This method of installing / viewing a backup cam can be done by cutting the ebrake wire to the HU and grounding the HU side AND putting a switch on the vehicle speed sensor (VSS) wire to the HU.
The G35/37's backup cam system includes a steering angle sensor (in steering column), a back up cam module (typically in the trunk), a spoiler mounted cam AND a unique HU. It is not locked out by the VSS and e-brake signals. The harness for the back up cam cars are also not already installed in the NON-back up cam cars. In short, getting a functioning FACTORY back-up cam with working trajectory in the Z is not gonna be cheap.
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