10%20E90%20Voltage%20Supply%20and%20Bus, BMW educational info, Dokumentacja
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//-->Table of ContentsE90 Voltage Supply & Bus SystemsSubjectPageVehicle Electrical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Battery Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5Rear Power Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6Battery Safety Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7Intelligent Battery Sensor (IBS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8IBS Measuring /Evaluation Function . . . . . . . . . . . . . . . . . . . . . . . .10Servicing the IBS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11IBS Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11Voltage Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11Current Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11Terminal 15 Wake-up Signal Faults . . . . . . . . . . . . . . . . . . . . . . . .12IBS Wake-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12Vehicle Ground Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13Junction Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16Distribution Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16Junction Box Electronic Control Module (JBE) . . . . . . . . . . . . . . . . . . . .19Bus Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22K-Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26K-Bus (protocol) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26LIN-Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26BSD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26Terminating Resistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26MOST Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27Light Direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28Fiber Optics Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29Identification of Fiber Optics Conductors . . . . . . . . . . . . . . . . . . .29Diagnosis Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30Data Flow Interruption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30Overtemperature Shut-Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30Power Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33Power Consumption During Operation . . . . . . . . . . . . . . . . . . . . . . . . . . .34Idle Speed Boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34Initial Print Date: 03/05Revision Date:SubjectPageElectric Load Reduction - Engine Running . . . . . . . . . . . . . . . . . . . . .34Electric Load Cut-Off with Engine Off . . . . . . . . . . . . . . . . . . . . . . . . .35Terminal 30g Relay (Time-Dependent Deactivation) . . . . . . . . . .36Terminal 30g_f Relay (Fault-Dependent Deactivation) . . . . . . . .37Terminal 30 (KL30) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39Terminal 15 (KL15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40System Diagnosis Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41Closed Circuit Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42Transport Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43Voltage Supply & Bus SystemsModel: E90Production: From Start of ProductionAfter completion of this module you will be able to:• Understand the power distribution function• Explain the Power Management function• Diagnose current draw situations• Identify importance of Junction Box• Understand the vehicles bus structure3E90 Voltage Supply & Bus SystemsVehicle Electrical SystemIntroductionThe voltage supply system on the E90 uses a Junction Box (JB) with a control moduleas a primary power distribution point and bus system gateway. To ensure balancedenergy management in the vehicle an energy management function similar to that usedin the E60 is utilized and is incorporated into the operating software of the DME.The power supply system in the E90 consists of the following:Index12345ExplanationJunction Box & Terminal 30 RelaysJunction Box Electronics Control ModuleSafety Battery TerminalBattery, Cables & GroundsIntelligent Battery Sensor (IBS)Index678910ExplanationRear Power Distribution BoxDMECASStarterAlternator4E90 Voltage Supply & Bus SystemsBattery ConnectionsLocated on the right side of the luggage compartment is the battery, from here power issupplied to the starter, alternator, engine electronics and to the junction box by way ofthree main supply cables.121. One main cable is routed on the interior of the vehicle along the right side, to thejunction box located behind the glovebox.2. Two additional main cables run from the B+ terminal underneath the vehicle to theengine compartment:Within the battery box are twotransfer points (as shown) for thetwo cables that run to the enginecompartment.The main power cables going tothe engine compartment areinstalled/routed (as indicated) in aprotected area underneath thebody of the vehicle.• One cable goes to the jump start terminal in the engine compartment and thenconnects to the starter and alternator.• The second cable is used to supply power to the engine electronics (DME andValvetronics).5E90 Voltage Supply & Bus Systems
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