Mercedes-Benz S-Class Saloon W223 2021 Owner's Manual page 199

Function of rear axle steering
The rear axle steering is an electromechanical
auxiliary steering on the rear axle which adjusts
the steering of the rear wheels according to the
position of the front wheels, depending on the
speed. This results in greater manoeuvrability and
improved driving stability, e.g. when cornering.
Rear axle steering has the following characteris-
tics:
reduced steering effort and turning circle
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resulting in reduced parking effort
improved driving stability, e.g. when cornering
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more direct steering resulting in improved
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handling of the vehicle
Observe the notes on snow chains and snow
chain mode ( page 396).
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ECO start/stop function
▌ECO start/stop function
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Depending on the engine, the ECO start/stop
function is not available in all drive programs.
Observe the status display in the driver dis-
play for this.
The engine is switched off automatically in the fol-
lowing situations if all vehicle conditions for an
automatic engine stop are met:
You brake the vehicle to a standstill in trans-
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mission position h or i.
Vehicles with a 48 V on-board electrical sys-
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tem: You depress the brake pedal when travel-
ling at a low speed.
If the system has detected one of the following
situations, the engine will not stop:
You stop at a stop sign and there is no vehicle
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in front of you.
The vehicle that stopped in front of you starts
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up again.
You manoeuvre, turn the steering wheel
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sharply or engage reverse gear.
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If the system detects an intelligent stop inhibi-
tor, for example, a stop sign, the engine will
not stop.
If you activate the HOLD function or engage
the park position j, the engine can be
P223 0288 02
Driving and parking 197
switched off in spite of an intelligent stop
inhibitor.
The engine is restarted automatically if:
You engage transmission position h or k.
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You depress the accelerator pedal.
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An automatic engine start is required by the
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vehicle.
You release the brake pedal.
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Vehicles with a 48 V on-board electrical sys-
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tem:
You release the brake pedal on a downhill
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gradient and the vehicle does not roll.
The vehicle rolls on a downhill gradient and
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does not automatically enter glide mode at
20 km/h.
ECO start/stop function symbols in the driver dis-
play:
The symbol è (green) appears when the
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vehicle is at a standstill: The engine was
switched off by the ECO start/stop function.