: While in channel mode, press [A] followed by [D/A] to verify the offset/transmit frequency.
Assuming you have downloaded the "weierwei vev3288s manual patched" PDF, follow this installation guide for your head unit: weierwei vev3288s manual patched
"I spent two weeks trying to get my reverse camera to work. The original manual said pin A4 (black) was ground. The patched manual showed a photo that pin A4 was actually illumination. Swapped it and it worked instantly." – : While in channel mode, press [A] followed