52 14... Replacing heating element for left or right front seat

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Necessary preliminary tasks:

Remove seat fabric
Remove backrest cover

NOTE: Side heating elements (side sections) are bonded with a foam section and cannot be separated from each other without causing damage.
Foam section and heating elements must be replaced.

Check new foam section:

No obvious damage or material defects
All trim wires present in foam
No bubbles in foam section
No dirt/contamination on foam or residual foam
Pay attention to foam section on left and right

Check new heating elements:

No obvious damage or material defects
All tear-off film pieces presents
Note variant by examining label on cable

Stick on bead parts at top (1) and bottom (2):

Detach adhesive film from left or right bead parts in succession and stick on heating elements along bead part edges.
Press down evenly in outwards direction

Fig 1: Identifying Stick On Bead Parts At Top And Bottom
Courtesy of BMW OF NORTH AMERICA, INC.

Stick on bead parts (1):

Detach adhesive film from left or right bead part (1) and stick on heating element along bead part edges.
Press down evenly in outwards direction

Fig 2: Identifying Stick On Bead Parts
Courtesy of BMW OF NORTH AMERICA, INC.

Check laying of heating elements:

Heating elements laid without folds
Heating elements correctly positioned
All bonding surfaces stuck on