- Faulty door lock actuators: The door lock actuators are responsible for locking and unlocking the doors. If the actuator for the rear doors is faulty, it may not be receiving the signal from the lock switch, or it may be unable to move the locking mechanism properly.
- Broken or disconnected wiring: The door lock actuators are connected to the central locking system by electrical wiring. If any of these wires are broken or disconnected, the actuators will not receive the signal to unlock the doors.
- Faulty central locking system: The central locking system is the electronic control unit that manages the locking and unlocking of all the doors. If the central locking system is faulty, it may not be sending the signal to unlock the rear doors.
To diagnose the exact issue, you will need to inspect the door lock actuators, the wiring, and the central locking system. If you are uncomfortable performing these checks yourself, it is best to take your vehicle to a qualified mechanic or auto electrician for a professional diagnosis and repair.
