NHTSA campaign 23V783000. Summary: Rivian Automotive, LLC (Rivian) is recalling certain 2022-2023 R1T and R1S vehicles. A software update may have deactivated the defroster and defogger system controls. Consequence: The inability to operate the windshield defrosting and defogging system can decrease the driver's visibility, increasing the risk of a crash. Remedy: Rivian has released an over-the-air (OTA) software update, free of charge. Owner notification letters were mailed December 21, 2023. Owners may contact Rivian customer service at 1-888-748-4261. Rivian's number for this recall is FSAM-1331.