Bosch DSC 3.X User Manual

1Introduction to DSCTable of ContentsIntroduction to DSC Subject PageModule Objectives...

10Introduction to DSCControl Module/ Hydraulic UnitThe control module used on the DSC III sys-tems varies between models. The DSC III5.3 system uses

Wheel Speed SensorsThe wheel speed sensors used are the same as on previous E38 and E39 models. Thesensor is a hall effect type which sends a digital

12Introduction to DSCHydraulic Pressure Sensor (Brake Pressure)The hydraulic system pressure sensor provides a 0-5 volt linear voltage signal to the D

Steering Angle SensorThe steering angle sensor is mounted at the bottom of the steering column near the flexi-ble coupling. The sensor is a new type

14Introduction to DSCRotation Rate Sensor (Bosch 5.3)The new sensor is a major contributor ofthe expanded capabilities of DSC III. Whenthe rotation r

Rotation Rate Sensor SignalsThe DSC III control module provides the rotation rate sensor with 12 volts operating powerand ground. In return, the senso

16Introduction to DSCLateral Acceleration Sensor (Bosch 5.3)This new sensor is a major contributor of the expandedcapabilities of DSC III.It is locate

17Introduction to DSCCombined Rotation Rate/Lateral Acceleration Sensor (Bosch DSC III 5.7)On DSC III (Bosch 5.7) the Rotation Rate sensor and the Lat

DSC SwitchThe system is active whenever the ignition is switchedon. When pressed, the switch provides a momentary 12volt signal to the DSC control mo

19Introduction to DSCDSC III (BOSCH 5.3) Hydraulic System ComponentsAs mentioned at the beginning of this section, there are minor differences in the

2Introduction to DSCModel: 1995-1997 E38 750iL, E31 850Ci with DSC II1998 E38 740i/iL and 750iL, E39 540i with DSC III 5.31999-Present E38 740i/iL and

20Introduction to DSCTo ensure sufficient brake fluid supply is always available to the hydraulic unit during ASC/DSC hydraulic regulation, the system

21Introduction to DSCHydraulic Charge Existing ASC+T and DSC II systems already perform hydraulic control regulation but do notrequire the additional

22Introduction to DSC750iL Vehicles:The electric Pre-boost pump delivers a brake fluid pressure of 7-15 bar to the isolatedchamber of the charge pisto

23Introduction to DSCP PLEFTREARBRAKELEFTREARBRAKERIGHTREARBRAKERIGHTREARBRAKELEFTFRONTBRAKELEFTFRONTBRAKERIGHTFRONTBRAKERIGHTFRONTBRAKEINLETVALVEINLE

24Introduction to DSCPrinciple of OperationDynamic Stability Control SystemsIntroductionDynamic Stability Control (DSC III version 5.3) was introduced

25Introduction to DSCDynamic Stability Control (DSC III)All of the familiar braking and straight line traction control features and system communi-cat

26Introduction to DSCThe expanded hydraulic control of individual wheel circuits is apparent when stabilizing avehicle exhibiting an oversteer conditi

27Introduction to DSCDSC FeaturesCorner Braking Control (CBC)CBC is a feature of dynamic stability control that is designed to improve the vehicle’s s

28Introduction to DSCMaximum Brake ControlThe MBC function is also designed to enhance a driver initiated braking procedure. TheMBC will build up the

29Introduction to DSCDiagnosisThe following diagnostic functions are available using the DISplus or GT-1.Control Unit Functions:Expert mode diagnosis

3Introduction to DSCOverview of DSC SystemsModel YearE36 E36/7Z3 E46 E39 E38 E53 E52 E65E66E851998 ASC+T ASC +TMK IV GN/A 9/97ASC +T5S: 528iDSC III 5

30Introduction to DSC CodingCoding must be performed after replace-ment of the DSC III control module or thesteering angle sensor. ZCS coding is foun

31Introduction to DSCReview Questions1. What are the primary differences between Bosch 5.3 and 5.7?2. What is the nominal voltage output of the Rotati

32Introduction to DSCReview Questions6. What hydraulic components are unique to the 750il with DSC 5.3?7. What 2 DSC component are responsible for the

4Introduction to DSCDynamic Stability Control (DSC II/DSCIII)Purpose of the SystemDSC adds a further dimension to the traction control system. DSC ad

5Introduction to DSCDynamic Stability Control (DSC II)Dynamic Stability Control II (DSC II) is a further development to the ABS/ASC+T5 tractioncontro

6Introduction to DSCKL 30KL 30KL 15KL 15ASC SWITCHASC SWITCHWHEELWHEELSPEEDSPEEDSENSORSSENSORSDIAGNOSISDIAGNOSISABSPUMPRELAYABSPUMPRELAYABS LAMPABS LA

7Introduction to DSCBosch 5. 3 DSC III I-P-O

8Introduction to DSCDSC III (Bosch 5.7) IPO

9Introduction to DSCDSC III 5.3 ComponentsThe Bosch DSC III 5.3 System consists of the following components:• DC III Control Module 83 Pin• Wheel Spee