2015 Toyota Camry

The sunroofs have a drain which sometimes can plug up. This car was maintained several times a year since purchase by Toyota dealer. When the drain plugged up this fall, water backed up and came down inside of the passenger compartment on top of the electrical fuses, body computer. The leak IS NOT DETECTABLE by owner or occupant. But when it manifests itself, it does so with the Blind Spot Monitor failing randomly, the seat belt warning lights might or might not work, the airbag safety system fails, sometimes the whole instrument dash acts erractic including random on/off blinking, the tire pressure monitoring system fails. All these problems can occur before owner is ever aware of the problem. Since one of the items that is getting corrosion is a fuse block - potential fire while parked in a garage or while being drive is a possibility. In an accident failure of air bags can result in a fatality. I'm an engineer, so when things started blinking on dash - I took pictures or had another occupant take pictures. I showed them to the dealer service - they didn't make the connection with corrosion on the body computer that monitors and manages all the systems including the anti-lock and rollover system. It's in for repair at dealer now, now idea on the cost - but they've said damage is extensive AND we caught it before most people encounter it. I checked and could find no Toyota Service Bulletin that warned to look for the problem, repair techs had vehicle for week trying to find problem - and it took me insisting on looking for corrosion before they found it. This should result in: 1)Toyota special service bulletin to inspect every year and verify sunroof drain not blocked. 2) read diagnostics codes of the body network computer for issues, 3)Toyota special service recall to repair damage free to customers.