Toyota Avalon rear seatbelt alarm activates with one passenger present, dealer has no solution on Toyota Avalon

Some Toyota Avalon owners report experiencing issues with the rear seatbelt alarm activating even when only one passenger is present. This problem may stem from a malfunctioning sensor that incorrectly detects occupancy, necessitating a check and possible replacement of the sensor. Additionally, some owners find that a software update can resolve seatbelt alarm issues, so ensuring the vehicle's software is current is advisable. Wiring or connection problems may also trigger the alarm incorrectly, and a thorough inspection by a qualified technician can help identify these issues. If the dealer is unable to provide a solution, seeking a second opinion from another authorized Toyota service center could yield different diagnostic insights. Lastly, some owners recommend contacting Toyota directly for further assistance or escalation of the issue if all other avenues have been exhausted.