Had a customer with an inoperative Subaru Eyesight system?
Before you start looking for communication errors or voltage drops to modules, grab a torch and have a close look inside the lense hood of the cameras. It's not uncommon for small spiders to make their way between the camera and the windscreen and spin small webs that obstruct the cameras.
Remove the camera lense hood and determine whether or not the spider webs have made contact with the camera. If so, the lense hood will need to be replaced. If not, carefully remove the spider webs with a cotton swab or similar, being careful not to touch the lense of the camera.
Read more about Subaru Eyesight and the other Top 5 New Vehicle Technologies Here