The back door can be locked/unlocked and opened/closed by the following procedures.
Automatic door locking and unlocking systems
Locking and unlocking the back doorOn-vehicle inspection
1. INSPECT COOLING SYSTEM FOR LEAKS
(a) Remove the radiator cap.
CAUTION:
Do not remove the radiator cap while the engine and radiator
are still hot. Pressurized, hot engine coolant and steam
may be released and cause serious burns.
(b) Fill the radiator with coolant and attach a radiator ...