Page 404 of 542

Display messages Possible causes/consequences and
0004 Solutions
Front-passenger
air bag enabled
See Operator's
Manual The front-passenger air bag is enabled during the journey, even
though:
R
a child, a small adult or an objec tweighing less than the
system's weight threshold is located on the front-passenger
seat.
or
R the front-passenger seat is unoccupied.
The system may detec tobjects or forces applying additional
weight on the seat.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X Apply the parking brake.
X Switch the ignition off.
X Open the front-passenger door.
X Remove the child and the child restraint system from the front-
passenger seat.
X If necessary, secure the child in a child restraint system on a
suitable rear seat.
X Make sure that there are no objects on the seat adding to the
weight.
The system may otherwise detec tthe additional weight and
interpret the seat occupant's weight as greater than it actually
is.
X Keep the seat unoccupied, close the front-passenger door and
switch on the ignition.
Observe the 00170016(Y page 54) indicator lamp and the
multifunction display and check the following:
Seat unoccupied and ignition switched on:
R the 00170016 indicator lamp must light up and remain lit.
When the indicator lamp is on, OCS (Y page 54) has disabled
the front-passenger air bag.
R the following display messages must not appearint he
multifunction display: Front Passenger air bag Enabled See Oper. Manual or
Front Passenger air bag Disabled
See Oper. Manual .
X Wait for a period of at least 60 seconds until the necessary
system checks have been completed.
X Make sure that the display messages do not appearint he
multifunction display.
If the conditions are not fulfilled, the system is not operating
correctly. 402
Display messagesOn-board computer and displays
Page 405 of 542
Display messages Possible causes/consequences and
0004 Solutions
X
Visit a qualified specialist workshop immediately. G
WARNING
If the 00170016 indicator lamp remains off even after performing the above corrective
steps, do no thave any childre ntwelve years old and under and other small individuals use the
front-passenger seat until the system has been repaired. Displa
ymessages
403On-board computer and displays Z
Page 406 of 542

Display messages Possible causes/consequences and
0004 Solutions
Front-passenger
air bag disabled
See Operator's
Manual The front-passenger air bag is disabled during the journey, even
though:
R
an adult
or
R a person larger than a certain size is occupying the front-
passenger seat.
If additional forces are applied to the seat, the system may
interpret the occupant's weight as lowe rthan it actually is.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X Apply the parking brake.
X Switch the ignition off.
X Have the occupant get out of the vehicle.
X Keep the seat unoccupied, close the front-passenger door and
switch on the ignition.
Observe the 00170016(Y page 54) indicator lamp and the
multifunction display and check the following:
Seat unoccupied and ignition switched on:
R the 00170016 indicator lamp must light up and remain lit.
When the indicator lamp is on, OCS (Y page 54) has disabled
the front-passenger air bag.
R the following display messages must not appearint he
multifunction display: Front Passenger air bag Enabled See Oper. Manual or
Front Passenger air bag Disabled
See Oper. Manual .
X Wait for a period of at least 60 seconds until the necessary
system checks have been completed.
X Make sure that the display messages do not appearint he
multifunction display.
If these conditions are fulfilled, the front-passenger seat can be
occupied again. Whether the 00170016indicator lamp
remains lit or goes out depends on how OCS classifies the
occupant.
If the conditions are not fulfilled, the system is not operating
correctly.
X Visit a qualified specialist workshop immediately. 404
Display messagesOn-board computer and displays
Page 407 of 542

G
WARNING
If the 00170016 indicator lamp remains lit with an adult occupant on the front-passenger
seat even after performing the above corrective steps, do not have any passenger use the front-
passenger seat until the system has been repaired. Lights
i Display messages about LEDs:
This display message will only appear if all LEDs have failed. Display messages Possible causes/consequences and
0004 Solutions
0002
Check Left
Cornering
Light or
Check Right Cornering
Light The left or right-hand cornering light is defective.
X
Check whethe ryou are permitted to change the bulb yourself
(Y page 286).
or
X Visit a qualified specialist workshop. 0002
Check Left Low
Beam or
Check Right
Low Beam The left or right-hand low-beam headlamp is defective.
X
Check whether you are permitted to change the bulb yourself
(Y page 286).
or
X Visit a qualified specialist workshop. 0002
Check Rear Left
Turn
Signal or
Check Rear Right Turn
Signal The rear left-hand or rear right-hand turn signal is defective.
X
Check whether you are permitted to change the bulb yourself
(Y page 286).
or
X Visit a qualified specialist workshop. 0002
Check Front Left
Turn
Signal or
Check Front Right Turn
Signal The front left-hand or front right-hand turn signal is defective.
X
Check whether you are permitted to change the bulb yourself
(Y page 286).
or
X Visit a qualified specialist workshop. Display messages
405On-board computer and displays Z
Page 408 of 542

Display messages Possible causes/consequences and
0004 Solutions
0002
Check Left Mirror
Turn
Signal or
Check Right Mirror Turn
Signal The turn signal in the left-hand or right-hand exterior mirror is
defective.
X
Chec kwhether you are permitted to change the bulb yourself
(Y page 286).
or
X Visit a qualified specialist workshop. 0002
Check
Center Brake
Lamp The high-mounted brake lamp is faulty.
X
Check whether you are permitted to change the bulb yourself
(Y page 286).
or
X Visit a qualified specialist workshop. 0002
Check Left Tail
and Brake
Lamp or
Check Right
Tail and Brake Lamp The left or right-hand tail lamp/brake lamp is defective.
X
Check whether you are permitted to change the bulb yourself
(Y page 286).
or
X Visit a qualified specialist workshop. 0002
Check Left High
Beam or
Check Right
High Beam The left or right-hand high beam is defective.
X
Check whether you are permitted to change the bulb yourself
(Y page 286).
or
X Visit a qualified specialist workshop. 0002
Check
Left License
Plate Lamp or
Check Right License
Plate Lamp The left or right-hand license plate lamp is defective.
X
Check whether you are permitted to change the bulb yourself
(Y page 286).
or
X Visit a qualified specialist workshop. 0002
Check Left Fog
Lamp or
Check Right
Fog Lamp The left-hand or right-hand front fog lamp is defective.
X
Check whether you are permitted to change the bulb yourself
(Y page 286).
or
X Visit a qualified specialist workshop. 406
Display messagesOn-board computer and displays
Page 409 of 542

Display messages Possible causes/consequences and
0004 Solutions
0002
Check Rear Left
Fog Lamp or
Check Rear Right Fog Lamp The left-hand or right-hand rear fog lamp is defective.
X
Chec kwhether you are permitted to change the bulb yourself
(Y page 286).
or
X Visit a qualified specialist workshop. 0002
Check Front Left
Parking
Lamp or
Check Front
Right Parking Lamp The front left or front right parking or standing lamp is defective.
X
Check whether you are permitted to change the bulb yourself
(Y page 286).
or
X Visit a qualified specialist workshop. 0002
Check
Left Reverse
Lamp or
Check Right
Reverse Lamp The left or right-hand backup lamp is defective.
X
Check whether you are permitted to change the bulb yourself
(Y page 286).
or
X Visit a qualified specialist workshop. 0002
Check Front Left
Sidemarker
Lamp or
Check Front
Right Sidemarker
Lamp The left or right front side marker lamp is defective.
X
Check whether you are permitted to change the bulb yourself
(Y page 286).
or
X Visit a qualified specialist workshop. 0002
Check Rear Left
Sidemarker
Lamp or
Check Rear Right Sidemarker
Lamp The rear left or right side marker lamp is defective.
X
Check whether you are permitted to change the bulb yourself
(Y page 286).
or
X Visit a qualified specialist workshop. 0002
Check
Left Daytime
Running
Light or
Check Right Daytime
Running Light The left or right-hand daytime running lamp is defective.
X Check whether you are permitted to change the bulb yourself
(Y page 286).
or
X Visit a qualified specialist workshop. 0002
Active Headlamps
Inoperative The active light function is defective.
X
Visit a qualified specialist workshop. Display messages
407On-board computer and displays Z
Page 410 of 542

Display messages Possible causes/consequences and
0004 Solutions
0002
Malfunction See
Oper. Manual The exterio
rlighting is defective.
X Visit a qualified specialist workshop. 0002
AUTO
Lamp Function
Inoperative The light sensor is defective.
X
Visit a qualified specialist workshop.
USA only:
X Switch off the daytime running lamps in the on-board computer
(Y page 387).
X Switch the lights on and off using the light switch. 0002
Please Switch Off
Lights The lights are still switched on when you leave the vehicle. A
warning tone also sounds.
X
Turn the light switch to 000Eor000D.
or
X If the rear fog lamp is switched on: press the light switch in to
the stop. Adaptive High-beam
Assist Inoperative Adaptive Highbeam Assist is faulty.
X
Visit a qualified specialist workshop. Engine
Displa
ymessages Possible causes/consequences and
0004 Solutions
000D
Check Coolant
Level See Oper.
Manual The coolant level is too low.
!
Avoid making long journeys with too little coolant in the engine
cooling system. The engine will otherwise be damaged.
X Add coolant, observing the warning notes before doing so
(Y page 467).
X If coolant needs to be added more often than usual, have the
engine coolant system checked at a qualified specialist
workshop. 408
Displa
ymessagesOn-board computer and displays
Page 411 of 542

Display messages Possible causes/consequences and
0004 Solutions
000C The fan motor is faulty.
X
At coolan ttemperatures under 248 ‡(120 †), drive to the next
qualified specialist workshop.
X Avoid subjecting the engine to heavy loads, e.g. driving in
mountainous terrain, and stop-and-go traffic. 000C
Coolant Low Stop
Vehicle Turn
Engine Off The coolant is too hot.
Aw
arning tone also sounds.
G WARNING
Do no tdrive when youre ngine is overheated. Thi scan cause some
fluids which may have leaked into the engine compartmen tto
catch fire.
Stea mfrom the overheated engine can also cause serious burns
which can occur just by opening the hood.
There is a risk of injury.
X Pull over and stop the vehicle safely and switch off the engine,
paying attention to road and traffic conditions.
X Secure the vehicle against rolling away (Y page 327).
X Leave the vehicle and keep a safe distance from the vehicle until
the engine has cooled down.
X Make sure that the air supply to the engine radiator is not
blocked, e.g. by snow, slush or ice.
X Do not start the engine again until the display message goes out
and the coolant temperature is under 248 ‡ (120 †).
Otherwise, the engine could be damaged.
X Pay attention to the coolant temperature display.
X If the temperature increases again, visit a qualified specialist
workshop immediately.
Under normal operating conditions and with the specified coolant
level, the coolant temperature may rise to 248 ‡ (120 †). Display messages
409On-board computer and displays Z