Chevrolet Sonic Owner's Manual: Door Locks

To lock or unlock the doors from outside the vehicle:

• Use the key in the driver door to lock all doors or unlock the driver door only.
• Press or
  on the Remote Keyless Entry (RKE)
  transmitter. See Remote Keyless Entry (RKE) System Operation.

To lock the doors from inside the vehicle:

• Press on the central locking
  switch or on the driver door switch.
• Press the lock knob on the driver door to lock all doors and, if equipped, the liftgate.

To unlock the doors from inside the vehicle:

• Press on the central locking
  switch or on the driver door switch.
• Pull the door handle. Pulling the door handle again unlatches the door.
• Lift the lock knob on the driver door to unlock the driver door.

See Door Locks. See Central Locking System.