1. Black: This connection is likely for the seatbelt buckle switch. When the seatbelt is buckled, the switch closes and completes the circuit, which turns off the seatbelt warning light on the dashboard.
2. Blue: This connection is likely for the seat occupancy sensor. The sensor detects whether someone is sitting in the seat and turns on the airbag if necessary.
3. Yellow: This connection is likely for the seat heater. When the seat heater is turned on, the switch closes and completes the circuit, which allows electricity to flow to the heating elements in the seat.
