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 on the inside edge of the rear doors. To use the safety lock:
To open a rear door when the safety lock is on:
When the safety lock is enabled, adults and older children will not be able to open the rear door from the inside. Cancel the safety locks to enable the doors to open from the inside.
To cancel the safety lock:
Lockout Protection
DoorsChannel Plate - Control Valve Body Side Automatic Transmission Unit
Channel Plate-–-ControlValve Body Side(2)Line(9)Regulated Apply(10)Exhaust Backfill(11)Actuator Feed Limit(12)PCS Line(13)PCS R1/456 Clutch(14)Shift Solenoid(16)R1/456 Clutch Feedback(18)PCS 35 Reverse Clutch(19)Reverse(20)35 Reverse Clutch Feed(22)Default(25)PCS 1234 Clutch(26)Drive(29)Drive 1-6( ...