Mercedes-Benz E-Class 2007 Owners Manual - Manual (Page 282)

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Controls in detail
Loading
Rear seat
There is a cargo tie-down ring 1 located
on each side of the footwell under the rear
seat.
Retaining hooks
Depending on vehicle production date one
or two hooks are located on the upper
edge of the trunk and can be used to
attach cargo items such as bags.
̈ Pull tab 1 of retaining hook 2 down.
! Do not use the retaining hooks to tie down
cargo.