BMW 3 (E46). Manual — part 125
from ASC/DSC switch on dash.
ABS control module signals turn
instrument cluster warning lamps
on during ASC/DSC regulation.
Hydraulic unit/control module
The hydraulic unit is mounted in
conjunction with the control module.
While the hydraulic unit and control
module function as one unit, they are
replaceable individually. All ABS/ASC or
ABS/DSC processing functions are
performed by the control module. The
control module is linked to the vehicle's
engine control module (ECM) and
transmission control module (AGS) (if
applicable) by the CAN-bus network.
Wheel speed sensors
Wheel speed sensors are a crucial
component in every ABS system. Control
modules use these sensor inputs to
determine overall vehicle speed and
individual wheel speed for both ABS
braking and stability control functions.
Three different types of wheel speed
sensor are used in the E46 electronic
braking and stability control systems:
1999 - 2000 Teves MK 20 ASC /
DSC: Inductive
2001 Bosch DSC III 5.7: Hall effect
2001 Teves MK 60 DSC:
Magnetoresistive
1 - Fastening element
2 - Ground contact
3 - Sensor wiring
4 - Sensor housing
5 - Metal pulse wheel
6 - Sensor element support
7 - Evaluation module
8 - Sensor element
9 - Magnet
10 - Pick-up surface
CAUTION!
The magnetoresistive and the Hall
effect sensor for the rear wheel are
physically interchangeable. However,
the electronic properties are not the
same and they must not be
interchanged.
DSC lateral acceleration sensor
The lateral acceleration sensor provides
the DSC control module with an input
signal based on the degree of lateral
acceleration (g forces) that the vehicle
experiences. Based on a 5 volt reference
voltage, the sensor will return an output
voltage that ranges between 0.5 and 4.5
volts to the DSC control module, with 1.8
volts as a standing voltage. This input,
along with other DSC inputs, determines
the amount of DSC regulation needed to
maintain vehicle stability.
Teves MK 60 DSC diagram
Bosch DSC III 5.7 diagram
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