3 Series E91 330d (M57T2) TOUR
memory entry.
The ACC sensor will be reactivated when the on-board supply voltage drops below 17.0 volts again.
Self-diagnosis and compensation for minor horizontal adjustments
External forces may change the alignment of the ACC sensor. A horizontal change leads to function limitations.
(Function limitations encountered are, e.g.: reaction to vehicles in the next lane or late reaction to vehicles in
the same lane).
Self-diagnosis allows the ACC sensor to compensate for minor horizontal adjustments of up to 1
°
.
If a horizontal adjustment of more than 1
°
is detected, Active Cruise Control will be deactivated and a fault will be
stored in the fault memory. A Check-Control message will be issued.
System limits
If the limit of the functional range is reached, the driver is prompted to act (brake or swerve) as follows: Display
for the monitored vehicle flashes red and an acoustic signal sounds.
During operation, the following system functions, which require explanation, can occur due to the limits of the
functional range (for the driver):
•
Limited range and deceleration
-
The range of the ACC sensor is limited (approximately 120 metres).
Rain, snow and fog absorb radar waves.
This will significantly reduce the range of the ACC sensor.
-
Active Cruise Control is only able to effect limited deceleration via the DSC (a maximum of 2.5 m/s
2
)
This means that cruise control is only able to compensate for a limited relative speed.
Active Cruise Control operation is only possible in flowing traffic in a road speed range from 30 km/h to
180 km/h.
•
Lateral monitoring range
The lateral monitoring range of the ACC sensor is limited, meaning that a monitored vehicle ahead could be
lost due to a tight bend.
In such cases, cruise control will not accelerate to the set speed for approximately 2 seconds. This will
prevent the vehicle from accelerating too close to the vehicle ahead, which is possibly only briefly not being
monitored.
When driving straight ahead, this can cause a delayed reaction to another vehicle cutting in close in front.
The vehicle cutting in will not be monitored by the cruise control until it is clearly in the same lane as the
vehicle with Active Cruise Control.
•
Display for monitored vehicle does not light up, the vehicle remains below the set speed and does not
accelerate further
Causes:
-
On sharp bends, the vehicle's speed will be controlled in such a way that lateral acceleration does not
exceed a maximum of 4.0 m/s
2
to maintain driving comfort.
•
Timed separation less than 1 second
The timed separation from a vehicle driving ahead is no less than 1 second when cruise control is active. In
certain conditions (e.g. when a vehicle cuts in a short distance ahead), this timed separation may briefly be
less than 1 second.
If the deceleration induced by the cruise control is not sufficient, the driver will have to intervene directly.
•
ACC sensor blind
If the ACC sensor is blinded, Active Cruise Control shuts down. (Blinding, e.g. due to extremely heavy
snowfall, through a layer of ice on the sensor or through dirt)
SBT Cruise control E90, E91, E92, E93
BMW AG - TIS
18.02.2013 21:20
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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