Preparatory Work:

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To avoid paintwork damage, tape off working area over large area at outlet of wire starter (2) with fabric adhesive tape(1)

Fig 1: Identifying Fabric Adhesive Tape

Courtesy of BMW OF NORTH AMERICA, INC.

Cut off required length (A) from cutting wire (A) = Window diagonal x 4
Check whether wire can get caught on rivets or retainers; if necessary, insert guide needles in bonding joint and guide cutting wire past