Mercedes Benz 2009 M-Class User Manual

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If the active head restraints have been trig-
gered in a rear-end collision, the active 
head restraints must be reset. Otherwise, 
the active head restraints cannot offer any 
additional protection in the event of anoth-
er rear-end collision.

You can tell that the head restraints have 
been activated when they have been 
moved forward and cannot be adjusted.

1 Reset tool
2 Active head restraint

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Take the reset tool

1 out of the 

Mercedes-Benz vehicle literature 
pouch.

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Guide reset tool

1 into the rectangu-

lar opening of the active head 
restraint

2.

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Press reset tool

1 downward in direc-

tion of arrow until you hear the head re-
straint release mechanism audibly 
disengage.

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Pull out reset tool

1.

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Firmly press the active head restraint 
cushion backward towards the head re-
straint cover in direction of arrow until 
it engages.

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Repeat this procedure on the active 
head restraint for the second front 
seat.

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After resetting the active head 
restraints store the reset tool

1 in the 

Mercedes-Benz vehicle literature 
pouch.

For information on active head restraints, 
see “Active head restraint” (

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page 80).

For information on head restraint adjust-
ment, see “Seats” (

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page 43).

i

G

For safety reasons, have the active head re-

straints checked by an authorized 

Mercedes-Benz Light Truck Center after a 

rear-end collision.

G

When pushing back the head restraint cush-

ion, take care that your fingers do not be-

come caught between the head restraint 

cushion and the cover. Failing to do so may 

lead to injury.

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