Mercedes-Benz 2008 M-Class Operator's Manual page 461

Practical hints
Resetting activated head restraints
Firmly press the active head restraint
cushion backward towards the head
restraint cover in direction of arrow
until it engages.
Repeat this procedure on the active
head restraint for the second front
seat.
After resetting the active head
restraints store reset tool 1 in the
Mercedes-Benz vehicle literature
pouch.
For information on active head restraints,
see "Active head restraint" ( page 88).
For information on head restraint adjust-
ment, see "Seats" ( page 43).
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