Page 406 of 561

405 Practical hints
What to do if …
Problem
Possible cause/conse-
quence
Suggested solution
;
(USA only)
3
(Canada only)
The red brake warning lamp 
comes on while driving and 
you hear a warning sound.
You are driving with the 
parking brake set.
Release the parking brake 
(page 56).
The ESP
® control unit may be 
malfunctioning.
The driving safety systems 
may not be available.
Continue driving with added caution. 
Wheels may lock during hard braking, 
reducing steering capability.
Read and observe messages in the 
multifunction display (
page 416).
The red brake warning lamp 
comes on while driving.
There is insufficient brake fluid 
in the reservoir.
Risk of accident! Carefully stop the 
vehicle in a safe location or as soon as 
it is safe to do so and notify an autho-
rized Mercedes-Benz Light Truck Cen-
ter. Do not add brake fluid! This will 
not solve the problem.
Warning!
G
Driving with the brake warning lamp illumi-
nated can result in an accident. Have your 
brake system checked immediately if the 
brake warning lamp stays on.
Do not add brake fluid before checking the 
brake system.Overfilling the brake fluid res-
ervoir can result in spilling brake fluid on hot 
engine parts and the brake fluid catching 
fire. You can be seriously burned.
!If you find that the brake fluid in the 
brake fluid reservoir has fallen to the 
minimum mark or below, have the 
brake system checked for brake pad 
thickness and leaks. 
         
        
        
     
        
        Page 413 of 561

412 Practical hintsWhat to do if …Problem
Possible cause/consequence
Suggested solution
H
Combination low tire pres-
sure/TPMS malfunction telltale 
for the TPMS or Advanced 
TPMS* illuminates continuous-
ly.
The TPMS or Advanced TPMS* detects a 
loss of pressure in at least one tire.
Carefully bring the vehicle to a halt, 
avoiding abrupt steering and braking 
maneuvers. Observe the traffic situation 
around you.
Read and observe messages in the 
multifunction display.
If the tire inflation pressure in the respec-
tive tire(s) has (have) been corrected, the 
combination low tire pressure/TPMS mal-
function telltale goes out after few minutes 
driving.
H
Combination low tire pres-
sure/TPMS malfunction telltale 
for the TPMS or Advanced 
TPMS* flashes 60 seconds and 
then stays illuminated.
There is a malfunction in the TPMS or 
Advanced TPMS*.
Read and observe messages in the 
multifunction display.
Have the TPMS or Advanced TPMS* 
checked by an authorized 
Mercedes-Benz Light Truck Center.
After the malfunction has been remedied, 
the combination low tire pressure/TPMS 
malfunction telltale goes out after few 
minutes driving. 
         
        
        
     
        
        Page 415 of 561
414 Practical hintsWhat to do if …Lamp in center consoleProblem
Possible cause/consequence
Suggested solution
59
The front passenger 
front air bag off indicator 
lamp illuminates and re-
mains illuminated with 
the weight of a typical 
adult or someone larger 
than a small individual on 
the front passenger seat.
The system is malfunctioning.
Have the system checked as soon as 
possible by an authorized 
Mercedes-Benz Light Truck Center.
Also read and observe any messages 
in the multifunction display and follow 
corrective steps (
page 423).
Warning!
G
If the59indicator lamp 
illuminates and remains illuminated with the 
weight of a typical adult or someone larger 
than a small individual on the front passen-
ger seat, do not have any passenger use the 
front passenger seat until the system has 
been repaired. 
         
        
        
     
        
        Page 416 of 561

415 Practical hints
What to do if …
Problem
Possible 
cause/consequence
Suggested solution
59
The front passenger 
front air bag off indicator 
lamp does not illuminate 
and/or does not remain 
illuminated with the 
weight of a typical 
12-month-old child in a 
standard child restraint or 
less on the front passen-
ger seat.
The system is malfunction-
ing.
Make sure there is nothing between seat cushion and 
child seat and check installation of the child seat.
Make sure no objects applying supplemental weight 
onto the seat are present.
Make sure no objects which apply forces to the seat 
are present (e.g. objects such as books, briefcases 
etc. lodged behind or around the seat, head restraints 
pushing against roof etc.). The system may recognize 
such forces as supplemental weight.
If the front passenger front air bag off indicator lamp 
remains out, have the system checked as soon as pos-
sible by an authorized Mercedes-Benz Light Truck 
Center. Do not transport a child on the front passen-
ger seat until the system has been repaired.
Also note any messages in the multifunction display 
and follow corrective steps (
page 423).
Warning!
G
If the59indicator lamp does 
not illuminate or remains out with the 
weight of a typical 12-month-old child in a 
standard child restraint or less on the front 
passenger seat, do not transport a child on 
the front passenger seat until the system 
has been repaired. 
         
        
        
     
        
        Page 417 of 561

416 Practical hintsWhat to do if …Vehicle status messages in the multifunction display
Warning and malfunction messages 
appear in the multifunction display located 
in the instrument cluster.
Certain warning and malfunction messag-
es are accompanied by an audible signal.
Address these messages accordingly and 
follow the additional instructions given in 
this Operator’s Manual.
Selecting the vehicle status message 
memory menu in the control system 
(page 173) displays both cleared and 
uncleared messages.
High-priority messages appear in the 
multifunction display in red color.Certain messages of high priority cannot 
be cleared from the multifunction display 
using the reset button (
page 158) or 
buttonj,k,ÿ, orè on the 
multifunction steering wheel.
Other messages of high priority and mes-
sages of less immediate priority can be 
cleared from the multifunction display 
using the reset button (page 158) or 
buttonj,k,ÿ, orè on the 
multifunction steering wheel. They are 
then stored in the vehicle status message 
memory (
page 173). Remember that 
clearing a message will only make the mes-
sage disappear. Clearing a message will 
not correct the condition that caused the 
message to appear.
Warning!
G
All categories of messages contain 
important information which should be 
taken note of and, where a malfunction is 
indicated, addressed as soon as possible at 
an authorized Mercedes-Benz Light Truck 
Center.
Failure to repair condition noted may cause 
damage not covered by the Mercedes-Benz 
Limited Warranty, or result in property dam-
age or personal injury.Warning!
G
No messages will be displayed if either the 
instrument cluster or the multifunction 
display is inoperative.
Contact the nearest authorized 
Mercedes-Benz Light Truck Center. 
         
        
        
     
        
        Page 418 of 561
417 Practical hints
What to do if …
On the pages that follow, you will find a 
compilation of the most important warning 
and malfunction messages that may 
appear in the multifunction display.
For your convenience the messages are 
divided into two sections:
Text messages (
page 418)
Symbol messages (
page 429)
iSwitching on the ignition causes all 
instrument cluster lamps (except high 
beam headlamp indicator lamp, and 
turn signal indicator lamps unless acti-
vated) as well as the multifunction dis-
play to come on. Make sure the lamps 
and multifunction display are in work-
ing order before starting your journey. 
         
        
        
     
        
        Page 420 of 561

419 Practical hints
What to do if …
Display message
Possible cause/consequence
Possible solution
ABS
unavailable
See Operator’s Manual
The ABS was deactivated because of 
insufficient power supply. The charg-
ing voltage has fallen below 10 volts.
The brake system is still functioning 
normally but without the ABS 
available.
Switch off electrical consumers that are 
currently not needed, e.g. seat heating*.
If necessary, have the generator 
(alternator) and the battery checked.
When the voltage is above this value again, the 
ABS is operational again and the message in 
the multifunction display should disappear.
Cruise 
control
Drive to workshop
Cruise control is malfunctioning.
Have cruise control checked by an 
authorized Mercedes-Benz Light Truck 
Center.
ESP
unavailable
See Operator’s Manual
In addition, the yellow ESP
® warning 
lampv comes on.
The ESP
® is deactivated because of 
a malfunction or interrupted power 
supply.
Continue driving with added caution.
Visit an authorized Mercedes-Benz Light 
Truck Center as soon as possible.
Failure to follow these instructions increases 
the risk of an accident. 
         
        
        
     
        
        Page 421 of 561

420 Practical hintsWhat to do if …Display message
Possible cause/consequence
Possible solution
ESP
unavailable
See Operator’s Manual
If the yellow ESP
® warning 
lampv flashes while driving and 
this message appears, the electron-
ic traction system has switched off 
to prevent overheating of the drive 
wheel brakes.
As soon as the brakes have cooled off, the 
electronic traction system switches on again.
The message in the multifunction display disap-
pears and the ESP
® warning lampv goes 
out.
The self-diagnosis has not yet been 
completed yet.
The display will clear after driving a short 
distance at a vehicle speed of above 
12 mph (20 km/h).
Malfunction
Visit workshop
In addition, the yellow ESP
® warning 
lampv comes on.
The ESP
® has detected a malfunc-
tion and switched off.
The ABS may still be operational.
Continue driving with added caution.
Have the system checked at an authorized 
Mercedes-Benz Light Truck Center as soon 
as possible.
Failure to follow these instructions increases 
the risk of an accident.
Display malfunction
Visit workshop
In addition, the yellow ESP
® warning 
lampv comes on.
The ESP
® or the ESP
® display is 
malfunctioning.
Continue driving with added caution.
Visit an authorized Mercedes-Benz Light 
Truck Center as soon as possible.
Failure to follow these instructions increases 
the risk of an accident.