86 21... Replacing inside light

Unclip cover (1) at side recess (arrowed) and remove towards bottom.

Fig 1: Unclipping Cover At Side Recess

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Unclip lamp housing (1) at side recess (arrowed).

Fig 2: Unclipping Lamp Housing At Side Recess

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Disconnect flat connector (1) from flat connector contact.

Fig 3: Disconnecting Flat Connector From Flat Connector Contact

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CAUTION: Before drilling out rivets, drive in rivet pins with a punch.
Drill out rivets (1). Pull off inside light mounting bracket (2) over flat connector (3).

Fig 4: Drill Out Rivets (1) And Pull Off Inside Light Mounting Bracket (2) Over Flat Connector (3)

Courtesy of BMW OF NORTH AMERICA, INC.