I found the info below on the TIS website: https://www.newtis.info/tisv2/a/en/

Unclip rear seat on left/right towards top.
For op. ext. seat heating only:
Unfasten plug connection.


Lift out rear seat.
Installation:
Feed belt buckles (1) through designated openings into correct location.
Make sure ISOFIX covers (2) are correctly engaged.

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