Mercedes-Benz S-Class 2011 - Manual (Page 307)

Problems with the engine
Problem Possible causes/consequences and M Solutions
The engine does not
start. The starter motor
can be heard. R There is a malfunction in the engine electronics.
R
There is a malfunction in the fuel supply.
X Turn the SmartKey back to position 0 in the ignition lock before
the next attempt to start with the SmartKey.
X Before the next starting attempt with KEYLESS-GO: shut all open
vehicle doors so that the signals from the SmartKey may be
better received.
or
X Pull the Start/Stop button out of the ignition.
X Use the SmartKey to start the engine, ( Y page 301) as external
radio signals cause KEYLESS-GO to malfunction. Avoid
excessively long and frequent attempts to start the engine as
these will drain the battery.
If the engine does not start after several attempts:
X Consult a qualified specialist workshop.
The engine does not
start. You cannot hear
the starter motor. The on-board voltage is too low because the starter battery is too
weak or discharged.
X Jump-start the vehicle ( Y page 471).
If the engine does not start despite attempts to jump-start it:
X Consult a qualified specialist workshop.
The starter motor was exposed to a thermal load that was too high.
X Allow the starter motor to cool down for approximately two
minutes.
X Try to start the engine again.
If the engine still does not start:
X Consult a qualified specialist workshop.
Driving
305
Driving and parking
Z