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 doorOverhaul
1. REMOVE MAGNETIC SWITCH ASSY
(a) Remove the nut and disconnect the lead wire from the
magnetic switch.
(b) Remove the 2 screws holding the magnetic switch to the
starter drive housing.
(c) Remove the magnetic switch.
(d) Remove the return spring and plunger from the drive
housing.
2. ...