If your vehicle has power locks, it has a programmable automatic door unlock feature.
The doors can be programmed through the Driver Information Center (DIC) to automatically unlock several ways. See DIC Vehicle Personalization for more information.
Automatic Door Lock
Rear Door Security Locks (Sedan)Chevrolet Cobalt Service & Repair Manual. Control Arm, Replace
Front
1.
Raise and support vehicle, then remove
tire and wheel assembly.
2.
Remove ball stud to steering knuckle
pinch bolt, then separate ball stud from steering knuckle.
3.
Remove control arm to rear ...