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Hi,
Regarding your backup camera issue, here are some troubleshooting tips:
Reverse trigger pin: Pin 5 on the head unit is the reverse trigger input. When this pin receives +12V, the head unit will automatically switch to the reverse camera interface, even if the camera is not connected properly.
Possible causes: Since you mentioned that nothing happens when shifting into reverse, the common causes are:
Troubleshooting method: Please check the camera power and video cable connections to ensure everything is properly connected. You can follow this video guide for detailed troubleshooting: [Login to see the link]
Following these steps usually helps identify and fix the issue.