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
DoorsPower Door Locks
Select and the following may display:
Auto Door Unlock
Unlocked Door Anti Lock Out
Delayed Door Lock
Auto Door Unlock
Select to set which of the doors will automatically unlock when the vehicle is
shifted into P (Park).
Select All Doors, Driver Door, or Off.
Unlocked Door Anti Lock O ...
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Throttle Body Heater Inlet Hose Replacement
Callout
Component Name
Preliminary Procedure
Remove the air cleaner outlet duct. Refer to
Air Cleaner Outlet Duct Replacement.
Drain the cooling system. Refer to
Cooling ...
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GM studies indicate that plugged or restricted transmission oil coolers and pipes
cause insufficient transmission lubrication and elevated operating temperatures
which can lead to premature transmission failure. Many repeat repair cases could
have been prevented by following published procedur ...