So I removed the rain sensor again and cleaned all silicone from the window and prism. This time I used 3M VHB transparent double-sided tape. It is crystal clear and the prism is stuck to the window nicely. But it still doesn't work at all. No sensors even register an inkling of anything in INPA. The light sensor works fine though.
If you take the rain sensor off the windshield with it on, should you be able to see the LEDs lit up inside the sensor? Because mine don't have anything lit up. I even used my cell phone camera in case it was an infrared light. The camera would pick it up and show it but our eyes can't see it naturally. Again nothing with the camera.
I'm at a loss. The only other thing I can think of is that the Fuyao glass has the wrong refractive index for the rain sensor. But somehow I highly doubt that.
There are four wires going to this RLS. Power, kbus, ground, and a 4th that I have to look up. I guess I need to start measuring voltages.
'04 330i ZHP sedan | Mystic blue | Alcantara | 6MT | 111k
'98 740il | Schwartz 2 | Sandbeige | 5AT | 238k | lowered on Bilsteins w/ B&G springs
'00 540i sport | Titanium silver | Black | 5AT | 120k
'85 Mustang GT convertible | Medium charcoal metallic | Gray | 5MT | 215k | one owner, all original