
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 

53 Restraint systems
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index BabySmart
TM airbag deactivation system
Special BabySmart
TM compatible child seats, designed 
for use with the Mercedes-Benz system and available at 
any authorized Mercedes-Benz Center are required for 
use with the BabySmart
TM airbag deactivation system.
With the special child seat properly installed, the 
passenger front airbag will not deploy. The 7 
indicator lamp located in the instrument cluster will be 
illuminated, except with key removed or in steering lock 
position 0. The system does not deactivate the door 
mounted side impact airbag.
Self-test BabySmart
TM 
without special child seat installed
After turning key in steering lock to position 1 or 2, the 
7 indicator lamp located in the instrument cluster 
comes on for approximately 6 seconds, extinguishes, 
then blinks once.
If the indicator lamp should not come on or is 
continuously lit, the system is not functioning. You must 
see an authorized Mercedes-Benz Center before seating 
any child on the front passenger seat.
BabySmart
TM is a trademark of Siemens Automotive Corp.
Wa r n i n g !
The BabySmart
TM Airbag Deactivation System will 
ONLY work with a special child seat designed to 
operate with it. It will not work with child seats 
which are not BabySmart
TM compatible.
Never place anything between seat cushion and 
child seat (e.g. pillow), since it reduces the 
effectiveness of the deactivation system.Follow the manufacturer’s instructions for 
installation of special child seats.
The passenger side front airbag will not deploy 
only if the 7 indicator lamp remains 
illuminated.Please be sure to check the indicator every time 
you use the special system child seat.Should the light go out while the restraint is 
installed, please check installation. If the light 
remains out, do not use the BabySmart
TM restraint 
to transport children on the front passenger seat 
until the system has been repaired. 

58 Restraint systems
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
out after approximately 5 seconds; after the lamp goes 
out, the system continues to monitor the components 
and circuitry of the airbag system and will indicate a 
malfunction by coming on again. If the lamp does not 
come on at all or if it fails to extinguish after 
approximately 5 seconds or if it comes on thereafter, 
a malfunction in the system has been detected.
The following system components are monitored or 
undergo a self-check: crash-sensor(s), airbag ignition 
circuits, front seat belt buckles, emergency tensioning 
retractors, seat sensor.
Initially, when the key is turned from steering lock 
position 0 to positions 1 or 2, malfunctions in the 
crash-sensor are detected and indicated (the “SRS” 
indicator lamp stays on longer than 5 seconds or does 
not come on).
Have the system checked at your authorized 
Mercedes-Benz Light Truck Center immediately.In the operational mode, after the indicator lamp has 
gone out following the initial check, interruptions or 
short circuits in the airbag ignition circuit and in the 
driver and front passenger seat belt buckle harnesses, 
and low voltage in the entire system are detected and 
indicated.
Wa r n i n g !
In the event a malfunction of the “SRS” is indicated 
as outlined above, the “SRS” may not be 
operational. For your safety, we strongly 
recommend that you visit an authorized 
Mercedes-Benz Light Truck Center immediately to 
have the system checked; otherwise the “SRS” may 
not be activated when needed in an accident, which 
could result in serious or fatal injury, or it might 
deploy unexpectedly and unnecessarily which 
could also result in injury. 

61 Restraint systems
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
• Sit properly belted in an upright position with 
your back against the backrest.• Adjust the driver’s seat as far as possible 
rearward, still permitting proper operation of 
vehicle controls. The distance from the center 
of the driver’s breastbone to the center of the 
airbag cover on the steering wheel must be at 
least ten inches (25 cm) or more. You should be 
able to accomplish this by a combination of 
adjustments to the seat and steering wheel. If 
you have any problems, please see your 
authorized Mercedes-Benz Light Truck Center.• Do not lean with your head or chest close to the 
steering wheel or dashboard.• Keep hands on the outside of steering wheel 
rim. Placing hands and arms inside the rim 
can increase the risk and potential severity of 
hand / arm injury when the driver front airbag 
inflates.• Adjust the front passenger seat as far as 
possible rearward from the dashboard when 
the seat is occupied.
• Occupants, especially children, should never 
lean their heads in the area of the door where 
the side airbag inflates. This could result in 
serious injuries or death should the airbag be 
triggered. Always sit upright, properly use the 
seatbelts and appropriate size infant or child 
restraint system.• 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.
Failure to follow these instructions can result in 
severe or fatal injuries to you or other occupants. 

63 Restraint systems
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index Safety guidelines for the seat belt, 
emergency tensioning retractor and airbag
Wa r n i n g !
• Damaged seat belts or belts that were highly 
stressed in an accident must be replaced and 
their anchoring points must also be checked. 
Use only belts installed or supplied by an 
authorized Mercedes-Benz Light Truck Center.• Do not pass belts over sharp edges.• Do not make any modification that could 
change the effectiveness of the belts.• Airbags and ETR’s are designed to function on 
a one-time-only basis. An airbag or emergency 
tensioning retractor (ETR) that was activated 
must be replaced.
• An airbag system component within the 
steering wheel gets hot after the airbag has 
inflated. Do not touch.• Improper work on the system, including 
incorrect installation and removal, can lead to 
possible injury through an unintended 
activation of the “SRS”.• No modifications of any kind may be made to 
any components or wiring of the “SRS”. This 
includes changing or removing any component 
or part of the “SRS”, the installation of 
additional trim material, badges etc. over the 
steering wheel hub, front passenger airbag 
cover, or front door trim panels, and 
installation of additional electrical / electronic 
equipment on or near “SRS” components and 
wiring. Keep area between airbags and 
occupants free of objects (e.g. packages, 
purses, umbrellas, etc.). 

64 Restraint systems
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
When you sell the vehicle we strongly urge you to give 
notice to the subsequent owner that it is equipped with 
an “SRS” by alerting him to the applicable section in the 
Operator’s Manual.
• In addition, through improper work there is 
the risk of rendering the “SRS” inoperative or 
causing unintended airbag deployment. Work 
on the “SRS” must therefore only be performed 
by an authorized Mercedes-Benz Light Truck 
Center.• For your protection and the protection of 
others, when scrapping the airbag unit or 
emergency tensioning retractor, our safety 
instructions must be followed. These 
instructions are available at your authorized 
Mercedes-Benz Light Truck Center.
• Given the considerable deployment speed and 
the textile structure of the airbags, there is the 
possibility of abrasions or other injuries 
resulting from airbag deployment. 

72 Rear view mirrors
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Automatic (optional on ML 320):
With the key in steering lock position 2 and the 
automatic antiglare function activated, the mirror 
reflection brightness responds to changes in light 
sensitivity.
To  a ctiva te:
Press button (1). The green indicator lamp in the rear 
view mirror lights up.To deactivate:
Press button (1) again. The indicator lamp in the rear 
view mirror goes out. The mirror brightness does not 
respond to changes in light sensitivity.
Notes:
With gear selector lever in position “R”, or with the 
interior lamps (except cargo compartment lamp) 
switched on, the mirror brightness does not respond to 
changes in light sensitivity.
The automatic antiglare function does not react, if 
incoming light is not aimed directly at sensors in the 
mirror.
Wa r n i n g !
In the case of an accident liquid electrolyte may 
escape the mirror housing when the mirror glass 
breaks.Electrolyte has an irritating effect. Do not allow the 
liquid come into contact with eyes, skin, clothing, 
or respiratory system. In cases it does, immediately 
flush affected area with water, and seek medical 
help if necessary. 

74 Rear view mirrors
Te ch n ica l
data Instruments 
and controlsOperationDrivingInstrument 
cluster displayPractical hints Car care Index
Vehicles with automatic antiglare function:
With the key in steering lock position 2, the driver’s 
side mirror reflection brightness responds to changes in 
light sensitivity.
With gear selector lever in position “R”, or with the 
interior lamps (except cargo compartment lamp) 
switched on, the driver’s side mirror brightness does 
not respond to changes in light sensitivity.Important!
Electrolyte drops coming into contact with the vehicle 
paint finish can only be completely removed while in 
their liquid state, by applying plenty of water.
Notes:
The exterior mirrors have electrically heated glass. The 
heater switches on automatically, depending on outside 
temperature.
If an exterior mirror housing is forcibly pivoted from its 
normal position, it must be repositioned by applying 
firm pressure until it snaps into place.
Wa r n i n g !
In the case of an accident liquid electrolyte may 
escape the mirror housing when the mirror glass 
breaks.Electrolyte has an irritating effect. Do not allow the 
liquid come into contact with eyes, skin, clothing, 
or respiratory system. In cases it does, immediately 
flush affected area with water, and seek medical 
help if necessary.