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61 12 160 Replacing wiring harness for heated rear window

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Necessary preliminary tasks: 

Disconnect plug connection (4).

Feed out cable loom (2) in direction of arrow out of pocket (1).

Release screws (3) and open cable holders (approx. 10 x) along aluminum rail.

Feed out and remove wiring harness for heated rear window.

Fig 1: Releasing Screws
G03298405Courtesy of BMW OF NORTH AMERICA, INC.
WARNING: Risk of trapping in the following work step (close convertible top).

Mechanical convertible top only: 

Cut open cable tie (1).

Release screw (2) and feed out microswitch (3) in direction of arrow.

To simplify this operation, move convertible top (4) into "Close" position slightly.

Installation: 

Replace cable ties.

Align microswitch.

Fig 2: Cutting Open Cable Tie
G03298406Courtesy of BMW OF NORTH AMERICA, INC.