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First make sure there is no dark window tint on the windshield causing the forward sensor to think it is night. Also make sure there are no stickers or decals on the back of the mirror or anything blocking the sensor on the back of the mirror. If none of this is present and the back up camera image shows up in the mirror, the mirror itself will need to be replaced.
Make sure the wiring connector is fully seated on the back of the mirror. If it is, the problem is internal in the mirror and it will need to be replaced.