Advise the customer that in the
event of a risk of windscreen
misting the stop is prevented
Advise the customer that the
stop was prevented due to high
humidity (risk of window
misting)
Advise the customer that the
above adaption channel is set
so that a stop is always
prohibited

maximum stop duration
reached

Trailer manoeuvring system
active by automatic
reactivation

Trailer manoeuvring system
active

Important note: This adaption
channel can also be used to set
a general stop prohibition and
an immediate restart by the air
conditioner
There are various operating
states in which the climate
control does not identify a
restart request via sensor
values, but by way of the
elapsed time. Risk of
windscreen misting.
An active trailer manoeuvring
system is deactivated by
driving forward at above 10
km/h. On stopping and
engaging reverse, the function
is automatically reactivated if
a vehicle speed of 20 km/h
was not exceeded beforehand.
In this case the start-stop
function is deactivated
If the trailer manoeuvring
system is active (activation
button indicates the active
function), the start-stop
function is deactivate and a
start request is sent

13 - Adaptive cruise control .
Start requests
Reason
Cause:
The objects detected by the
front radar in front of the
Driving ahead driving off,
vehicle set off from a standstill
ACC off
although the ACC system has
been deactivated by the lever.
The objects detected by the
front radar in front of the
Driving ahead Vehicles start
vehicle set off from a standstill
moving, ACC passive
although the ACC system is
not actively controlling.
The objects detected by the
Driving ahead driving off,
front radar in front of the
ACC active, auto drive-off
vehicle set off from a
possible
standstill. The engine is started
to enable automatic drive-off.

Advise the customer that in the
event of a risk of windscreen
misting the stop is prevented

Advise the customer that an
active trailer manoeuvring
system deactivates the startstop function.

Advise the customer that an
active trailer manoeuvring
system deactivates the startstop function.

Handling
Advise the customer that
monitoring of the objects in
front of the vehicle is possible
even with the ACC disabled.
Advise the customer that
monitoring of the objects in
front of the vehicle is possible
even with the ACC disabled.
Advise the customer that the
ACC system may start the
engine as soon as the traffic
ahead sets off.

Driving ahead set off, ACC
active, auto. drive-off disabled

Stop prohibitions
Reason
Driving ahead driving off,
ACC off

Driving ahead Vehicles start
moving, ACC passive

Driving ahead driving off,
ACC active, auto drive-off
disabled

The objects detected by the
front radar in front of the
vehicle set off from a
standstill. The engine is started
to drive off as soon as the
driver inputs the command to
do so

Cause:
The objects detected by the
front radar in front of the
vehicle set off from a standstill
although the ACC system has
been deactivated by the lever.
The objects detected by the
front radar in front of the
vehicle set off from a standstill
although the ACC system is
not actively controlling.
The objects detected by the
front radar in front of the
vehicle set off from a
standstill. The engine is started
to drive off as soon as the
driver inputs the command to
do so

19 - Data bus diagnostic interface
Start requests
Reason
Cause:
Too many consumers were
switched on. Customer has too
Consumer current too high
many consumers operating
simultaneously
The battery state of charge is
not adequate to safeguard a
Tappable battery charge too
protracted vehicle standing
low
time (parking at the airport).
Poor battery state of charge.
Aged or cyclised battery
The battery state of charge is
not adequate to safeguard
Battery charge condition too
vehicle restarting (parking at
low
the airport). Poor battery state
of charge. Aged or cyclised
battery

Advise the customer that the
ACC system may start the
engine as soon as the traffic
ahead sets off.

Handling
Advise the customer that
monitoring of the objects in
front of the vehicle is possible
even with the ACC disabled.
Advise the customer that
monitoring of the objects in
front of the vehicle is possible
even with the ACC disabled
Advise the customer that the
ACC system may start the
engine as soon as the traffic
ahead sets off

Handling
Advise the customer that too
many activated consumers
deactivate the start-stop
function
Run battery state of charge test
program

Run battery state of charge test
program

Charging contingent

Low voltage

Service life expired

During the stop phase, too
much energy was consumed
from the battery; this is
primarily caused by extended
stop phases
Inadequate battery voltage due
to poor state of charge
The battery state of charge is
not adequate to safeguard
vehicle restarting (parking at
the airport). Poor battery state
of charge. Aged or cyclised
battery

Restart because of outside
temperature

Ambient temperature very low

Special start requirements

previously not implemented
(rate action)

Stop prohibitions
Reason

Battery temperature

Special veto active

Idle speed increase active

Possible standing time too
short

Cause:
The battery temperature was
too high or too low
Transport mode was active;
production mode was active;
quick no-load current
measurement was active
Too many consumers were
active; battery discharged
during driving. Alternator
function not safeguarded.
Charging cable has
excessively high contact
resistance. Customer has too
many consumers operating
simultaneously
The battery state of charge is
not adequate to safeguard a
minimum stop time. Poor
battery state of charge. Aged
or cyclised battery

Advise the customer that this
action deactivates the startstop function.
Run battery state of charge test
program
Run battery state of charge test
program
Advise the customer that there
is a risk that the required
starter current to start the
engine might not be available
due to the low ambient
temperature.
.

Handling
Advise the customer that this
is a battery protection
function. The battery should
not be already damaged by
exceeding or undershooting
the temperature limits
Reset transport/production
mode as necessary

Check wiring from alternator
to battery and check alternator
function. If necessary, explain
to the customer that too many
active consumers deactivate
the start-stop function.

Run battery state of charge test
program

Consumer current too high

Tappable charge too low

Charge too low

Battery charge condition too
low

intermittent operation

Too many consumers were
switched on. Customer has too
many consumers operating
simultaneously.
The battery state of charge is
not adequate to safeguard a
protracted vehicle standing
time (parking at the airport).
Poor battery state of charge.
Aged or cyclised battery
Battery charge time since last
engine stop too short
The battery state of charge is
not adequate to safeguard a
protracted vehicle standing
time (parking at the airport).
Poor battery state of charge.
Aged or cyclised battery
During the last start-stop stop
phase, a specific charge was
tapped from the 12V battery.
For that reason, a restart was
requested.

Outside temperature

Ambient temperature very low

Usable battery charge too low

12V battery tappable charge
too low

Energy management special
veto

Transport mode set

22 - Four-wheel drive electronics
Stop prohibitions
Reason
Cause:
The system is performing a
self-test. During this time the
Active system test
start-stop function is not
possible.

Explain to the customer that
too many active consumers
deactivate the start-stop
function.
Run battery state of charge test
program
Explain to the customer that
this will ensure reliable
restarting.
Run battery state of charge test
program

Charge is reconnected after
restarting by running the
combustion engine
Advise the customer that there
is a risk that the required
starter current to start the
engine might not be available
due to the low ambient
temperature.
Battery recharging
Deactivate transport mode

Handling
Advise the customer that this
action deactivates the startstop function.

44 - Power steering
Stop prohibitions
Reason

Cause:

Manual steering torque too
large

Steering wheel was moved at
standstill

Calculated steering angle too
large

The steering angle is more
than 300°

Limp home mode active

Internal fault in control unit
(e.g. sensor error)

Start requests
Reason

Cause:

Manual steering torque too
large

Steering wheel was moved at
standstill

Handling
Advise the customer that this
action forces the engine to
start, as it is interpreted as
manoeuvring for which
steering assistance is desired
Advise the customer that this
action forces the engine to run.
At a steering angle greater
than 300°, steering assistance
is required immediately on
driving off due to the steering
correction forces.
Advise the customer that due
to an internal defect the
steering assistance of the
steering gear is reduced to
30% and the yellow warning
lamp is displayed. After an
ignition on/off cycle, the
steering is continuously
switched off with a red
warning lamp.

Handling
Advise the customer that this
action forces the engine to
start, as it is interpreted as
manoeuvring for which
steering assistance is desired

46 - Convenience system central control unit
Stop prohibitions
Reason

Key not in vehicle

Cause:
Communication between key
and vehicle interrupted.
Battery in key too weak.
Key removed while vehicle
running

Handling
Check batteries in key or move
key into vehicle. If this is OK,
advise the customer where
appropriate that this action
deactivates the start/stop
function

74 - Chassis control
Stop prohibitions
Reason
.
.
.

Cause:
.
.
.

Handling
.
.
.

Start requests
Reason
.
.
.

Cause:
.
.
.

Handling
.
.
.

A5 - Driver assistance systems
Stop prohibitions
Reason
Cause:
The parking assistant button
was pressed or reverse gear
Park assist active
was engaged. During this time
the start-stop function is
deactivated.
If the trailer manoeuvring
system is active (activation
button indicates the active
Trailer positioning assistant
function), the start-stop
function is deactivate and a
start request is sent
Start requests
Reason
Park assist active

Trailer positioning assistant

Cause:
The parking assistant button
was pressed or reverse gear
was engaged. During this time
the start-stop function is
deactivated.
If the trailer manoeuvring
system is active (activation
button indicates the active
function), the start-stop
function is deactivate and a
start request is sent

Handling
Advise the customer that this
action deactivates the startstop function.
Advise the customer that an
active trailer manoeuvring
system deactivates the startstop function.

Handling
Advise the customer that this
action deactivates the startstop function.
Advise the customer that an
active trailer manoeuvring
system deactivates the startstop function.

C5 - Thermal management
Stop prohibitions
Reason
Cause:

Power quota, thermal
management

Possibly HV battery state of
charge too low

Stop prohibition from AC
operating unit

Specified interior temperature
not yet reached or defrost
function active

Outside air temperature too
low

Ambient temperature