The rear door safety locks prevent passengers from opening the rear doors from inside the vehicle.
Manual Safety Locks

If equipped, the safety lock is located on the inside edge of the rear doors. To use the safety lock:
1. Insert the key into the safety lock slot and turn it so the slot is in the horizontal position.
2. Close the door.
3. Do the same for the other rear door.
To open a rear door when the safety lock is on:
1. Unlock the door by lifting the rear door lock, using the power door lock switch, or with the Remote Keyless Entry (RKE) transmitter.
2. Open the door from the outside.
To cancel the safety lock:
1. Unlock the door and open it from the outside.
2. Insert the key into the safety lock slot and turn it so the slot is in the vertical position.
3. Do the same for the other rear door.
Lockout Protection
DoorsFront Bumper Fascia Air Deflector Replacement
Front Bumper Fascia Air Deflector Replacement
Callout
Component Name
Preliminary Procedure
Remove the front bumper fascia opening lower cover. Refer to Front Bumper
Fascia Opening Lower Cover Replacement.
...
Front Wheel Speed Sensor Replacement
Removal Procedure
Warning: Refer to Brake Dust Warning.
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
Remove the tire and wheel assembly. Refer to Tire and Wheel Removal
and Installation.
Clean the wheel speed sensor mounting area on t ...
Data Link Communications Description and Operation
Note: This is an overview of different serial data buses used by GM
devices to communicate with each others. Use Data Communication Schematics to
find out which serial data buses are configured for a specific vehicle.
Circuit Description
There are many components in a vehicle t ...