Mercedes-Benz S-Class Coupe Operator's Manual page 79

Problem
The engine cannot be
started using the Smart-
Key.
The engine cannot be
started using the Start/
Stop button. The Smart-
Key is in the vehicle.
You have lost a Smart-
Key.
You have lost the
mechanical key.
Possible causes/consequences and M Solutions
KEYLESS-GO is malfunctioning.
Lock/unlock the vehicle using the remote control function of the
X
SmartKey.
Have the vehicle and SmartKey checked at a qualified specialist
X
workshop.
If the vehicle can also not be locked/unlocked using the remote con-
trol function:
Lock or unlock the vehicle using the mechanical key (
X
Have the vehicle and SmartKey checked at a qualified specialist
X
workshop.
The on-board voltage is too low.
Switch off non-essential consumers, e.g. seat heating or interior
X
lighting, and try to start the engine again.
If this does not work:
Check the starter battery and charge it if necessary (
X
or
Jump-start the vehicle (
X
or
Consult a qualified specialist workshop.
X
The vehicle is locked.
Unlock the vehicle and try to start the vehicle again.
X
The SmartKey battery is discharged or nearly discharged.
Check the SmartKey battery (
X
( page 75).
Y
If this does not work:
Start your vehicle with the SmartKey in the ignition lock.
X
There is interference from a powerful source of radio waves.
Start your vehicle with the SmartKey in the ignition lock.
X
Have the SmartKey deactivated at a qualified specialist workshop.
X
Report the loss immediately to the vehicle insurers.
X
If necessary, have the locks changed as well.
X
Report the loss immediately to the vehicle insurers.
X
If necessary, have the locks changed as well.
X
page 295).
Y
page 75) and replace it if necessary
Y
SmartKey
77
page 79).
Y
page 294).
Y
Z