Mercedes-Benz GL-Class 2007 Owners Manual - Manual (Page 310)

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Controls in detail
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1 Strap
2 Seat cushion
̈ Pull strap 1 in direction of arrow.
̈ Fold seat cushion 2 forward.
3 Lever
̈ Pull and hold lever 3 in direction of
arrow at resistance point.
The seat backrest folds down.
̈ Check for secure locking by pushing
and pulling on the seat backrest.