The passenger's seatbelt warning comes on with no one in the seat.
This is a failure of the seat occupant sensor. This is very common on your vehicle. The sensor fails and makes the computer think that there is someone in the seat. The sensor would need to be replaced as the entire seat bottom. If you are not planning on repairing this yourself, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the issue in person and recommend a repair.
Have a car question? Get free advice from our top-rated mechanics.
Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%