My Nexus 5 rear-facing camera was broken
I found the ifixit guide to substitute my camera, but it didn't worked. So I looked for alternative guides and finally managed to substitute it.
Never give up, and find an other guide.
Replace a rear-facing camera in your Nexus 5 smartphone.
* Features optical image stabilization.
If your rear camera has sensor issues, focusing problems, or shows a blank image, you’ll want to replace this part.