BMW 1 Series Reference Manual page 75

Convertible top open and stored in the luggage compartment
Hall sensor, main pillar positioned
Hall sensor, main pillar stowed
Hall sensor, roll bar unclamped
Hall sensor, clamping bar in position (roll bar raised)
Hall sensor, roll bar stowed
Hall sensor, windnield cowl panel closed
Incremental sensor, windnield cowl locking system motor position
Hall sensor, convertible top storage compartment lid locked
Hall sensor, convertible top storage compartment lid open
Microswitch, Trunk partition down position
Sensor State
no
yes
no
no
no
no
Lock opened
yes
no
yes
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E88 Complete Vehicle