When unlocking your 1999 Jeep GC with remote a loud buzzing grinding sound comes from the driver side door and never unlocks you use key every time why?

The buzzing grinding sound you hear when unlocking your 1999 Jeep GC with the remote is likely due to a faulty door lock actuator. The door lock actuator is a small electric motor that moves the locking mechanism in the door to lock and unlock it. When the actuator fails, it can make a grinding noise and prevent the door from unlocking.

To fix the problem, you will need to replace the door lock actuator. This is a relatively simple repair that can be done in about an hour with basic tools.

Here are the steps on how to replace the door lock actuator in a 1999 Jeep GC:

1. Disconnect the negative battery cable.

2. Remove the door panel.

3. Locate the door lock actuator. It is usually located behind the door handle.

4. Disconnect the electrical connector from the door lock actuator.

5. Remove the bolts that hold the door lock actuator in place.

6. Install the new door lock actuator.

7. Reconnect the electrical connector to the door lock actuator.

8. Reinstall the door panel.

9. Reconnect the negative battery cable.

Once you have replaced the door lock actuator, the buzzing, grinding sound when unlocking the door should be gone, and the door should unlock properly with the remote.