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37 Seats
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Seats, front
Caution!
Do not remove head restraints except when mounting 
seat covers. For removal see page 43. Whenever head 
restraints have been removed be sure to reinstall them 
before driving.
Wa r n i n g !
Do not adjust the driver’s seat while driving. 
Adjusting the seat while driving could cause the 
driver to lose control of the vehicle.Never ride in a moving vehicle with the backrest 
reclined. Sitting in an excessively reclined position 
can be dangerous. You could slide under the seat 
belt in a collision. If you slide under it, the belt 
would apply force at the abdomen or neck. That 
could cause serious or even fatal injuries. The 
backrest and seat belt provide the best restraint 
when the wearer is in an upright position and the 
belt is properly positioned on the body.Never place hands under seat or near any moving 
parts while a seat is being adjusted.
Wa r n i n g !
When leaving the vehicle always remove the key 
from the steering lock, and lock your vehicle.Do not leave children unattended in the vehicle or 
with access to an unlocked vehicle. Unsupervised 
use of vehicle equipment may cause serious 
personal injury. 
     
        
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38 Seats
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Important!
Prior to operating the vehicle, the driver should adjust 
the seat height for proper vision as well as fore / aft 
placement and backrest angle to insure adequate 
control, reach, operation, and comfort. The head 
restraint should also be adjusted for proper height. See 
also airbag section on page 56 for proper seat 
positioning.
In addition, also adjust the steering wheel to ensure 
adequate control, reach, operation, and comfort.
Both the inside and outside rear view mirrors should be 
adjusted for adequate rearward vision.
Fasten seat belts. Infants and small children should be 
seated in a properly secured restraint system that 
complies with U.S. Federal Motor Vehicle Safety 
Standard 213 and Canadian Motor Vehicle Safety 
Standard 213.
All seat, head restraint, steering wheel, and rear view 
mirror adjustments as well as fastening of seat belts 
should be done before the vehicle is put into motion.
Wa r n i n g !
Children 12 years old and under must never ride in 
the front seat, except in a Mercedes-Benz 
authorized BabySmart
TM compatible child seat, 
which operates with the BabySmart
TM system 
installed in the vehicle to deactivate the passenger 
side front airbag when it is properly installed. 
Otherwise they will be struck by the airbag when it 
inflates in a crash. If this happens, serious or fatal 
injury can result.
According to accident statistics, children are safer 
when properly restrained in the rear seating 
positions than in the front seating positions. 
Infants and small children must ride in the back 
seats and be seated in an appropriate infant or 
child restraint system, which is properly secured 
with the vehicle’s seat belt, fully in accordance 
with the child seat manufacturer’s instructions.A child’s risk of serious or fatal injuries is 
significantly increased if the child restraints are 
not properly secured in the vehicle and the child is 
not properly secured in the child restraint. 
     
        
        Page 42 of 317
39 Seats
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Manual seats (ML 320)
We recommend to adjust the manual seat in the 
following order:
1Seat, fore / aft
Lift handle (1), slide seat to desired position and 
allow handle to reengage. Check for proper 
engagement before driving. The position should be 
as far rearward as possible, consistent with ability to 
properly operate controls.2Seat cushion inclination adjustment
Raise lever (2), move seat cushion to desired 
position. Release lever.
3Backrest adjustment
Turn handwheel (3).
4Head restraint height
Raising: 
Pull up on head restraint.
Lowering: 
Push button (4), located at top of seat back, and 
push down on head restraint.
Adjust head restraint to support the back of the head 
approximately at ear level. The head restraint angle 
can also be adjusted manually.
See page 43 for removing head restraints. 
     
        
        Page 43 of 317

40 Seats
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Power seats (standard; optional on model ML 320)
The slide switches are located on the entry side of each 
front seat base.
Turn key in steering lock to position 1 or 2 (with the 
driver’s or passenger’s door open, the power seats can 
also be operated with the key removed or in steering 
lock position 0).We recommend to adjust the power seat in the following 
order:
1Seat, up / down
Press the switch (up/down direction) until 
comfortable seating position with still sufficient 
headroom is reached.
2Seat adjustment, fore / aft
Press the switch (fore / aft direction) until a 
comfortable seating position is reached that still 
allows you to reach the accelerator / brake pedal 
safely. The position should be as far rearward as 
possible, consistent with ability to properly operate 
controls.
3Seat cushion tilt
Press the switch in the direction of the arrow until 
your legs are lightly supported.
4Backrest tilt
Press the switch in the direction of the arrow until 
your arms are slightly angled when holding the 
steering wheel. 
     
        
        Page 44 of 317

41 Seats
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Only minor personal adjustments, as described below, 
should then be required. 
For exterior rear view mirrors, see page 73; 
inside rear view mirror, see page 71; 
steering wheel adjustment, see page 70.
Note:
See page 42 for instructions on storing and recalling the 
seat position.Head restraint
Raising: 
Pull up on head restraint.
Lowering: 
Push button, located at top of seat back, and push down 
on head restraint, see also page 43.
Adjust head restraint to support the back of the head 
approximately at ear level. The head restraint angle can 
also be adjusted manually.
See page 43 for removing head restraints.
Wa r n i n g !
When leaving the vehicle always remove the key 
from the steering lock, and lock your vehicle.The power seats can also be operated with the 
driver’s or passenger door open. Do not leave 
children unattended in the vehicle or with access 
to an unlocked vehicle. Unsupervised use of vehicle 
equipment may cause serious personal injury. 
     
        
        Page 45 of 317

42 Seats
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Memory storing and recalling 
(optional on model ML 320 and ML 430)
5Memory button
6Position buttonsStoring
Three sets of seat positions may be programmed into 
memory. After the seat is positioned, push memory 
button (5), release, and within 3 seconds push position 
button “1”. A second and third set of positions for the 
same seat can be programmed into memory by pushing 
first memory button (5) and then position button “2”, 
respectively “3”.
Recalling
To recall a seat position, push and hold one of the 
position buttons “1”, “2” or “3” until seat movement has 
stopped. The seat movement stops when the respective 
position button is released.
Caution!
Do not operate the power seats using the memory 
button if the seat backrest is in an excessively reclined 
position. Doing so could cause damage to front or rear 
seats.
First move the backrest to an upright position. 
     
        
        Page 46 of 317
43 Seats
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Head restraint removal
Removal:
Pull head restraint to its highest position. Push lock 
button (arrow) and pull out head restraint completely 
with both hands.
Installation:
Insert the head restraint and push it down to the stop.
Push lock button (arrow) and adjust head restraint down 
to the desired position.Ensure proper head restraint positioning, see above.
Wa r n i n g !
For your protection, drive only with properly 
positioned head restraints.Adjust head restraint to support the back of the 
head approximately at ear level.Do not drive the vehicle without the seat head 
restraints. Head restraints are intended to help 
reduce injuries during an accident. 
     
        
        Page 47 of 317
44 Seats
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Heated seats (front, optional on ML 320)
The front seat heater switches are located on the center 
console.
The front seat heaters can be switched on with the 
engine running.Press switch to turn on seat heater:
1Normal seat heating mode. One indicator lamp in 
the switch lights up.
2Rapid seat heating mode. Both indicator lamps in 
the switch light up.
After approximately 5 minutes in the rapid seat 
heating mode, the seat heater automatically 
switches to normal operation and only one indicator 
lamp will stay on.
Turning off seat heater:
If one indicator lamp is on, press upper half of switch.
If both indicator lamps are on, press lower half of 
switch.
If left on, the seat heater automatically turns off after 
approximately 20 minutes of operation.
P54.25-2036-26
12