1. Check the Child Safety Lock: Ensure the child safety lock on the rear door is disengaged. Sometimes, this lock can prevent the door from opening, even if the latch is released.
2. Use the Key: Try to insert the key into the door lock cylinder and turn it. If the lock mechanism is damaged or jammed, the key might not turn smoothly, but you should feel some resistance.
3. Pull the Handle: While inserting the key and turning it, gently pull the door handle. If the lock starts to disengage, you may be able to pull the door open.
4. Apply Lubricant: If the lock mechanism is stuck, try applying a lubricant, such as WD-40, into the lock cylinder and onto the latch. This might help to loosen the jammed parts.
5. Use a Slim Jim: If the lock remains jammed and you cannot open it with a key or lubricant, you may need to use a slim jim or a similar tool. This thin metal rod can be inserted into the door frame to manipulate the internal locking mechanisms.
6. Disengage the Linkage Rod Manually: If the linkage rod is preventing the lock from releasing, you may need to access the linkage mechanism and disengage it manually. This is a more advanced procedure and should be attempted only if you are comfortable working on car mechanics.
Remember that if you are unsuccessful in opening the door or if you damage the lock during the process, it's best to consult a professional automotive locksmith or mechanic to avoid causing further issues or damage to your vehicle.