Checking unlocking of rotary striker lock:

• Close rotary striker lock (1) with a screwdriver,
• lock car with car key,
• unlock car with car key,
• open rotary striker lock (1) with outside door handle,
• if rotary striker lock (1) opens, then OK.
• If rotary striker lock (1) fails to open,
• slacken adjustment screw (2) again,
• Retighten adjusting screw (2),
• carry out check again.

Fit sealing cap (3).

Fig 1: Identifying Rotary Striker Lock Position

Courtesy of BMW OF NORTH AMERICA, INC.