BMW 3 ELECTICAL SYSTEM- Repair Manual
BMW 3 ELECTICAL SYSTEM– Repair Manual, read for free online in PDF format. We hope this helps you resolve any issues you may have. If you have further questions, please contact us through the contact form.
Table of Contents:
- Page 3 – Voltage Supply & Bus Systems; Production: From Start of Production; After completion of this module you will be able to:; • Understand the power distribution function
- Page 4 – Introduction; The power supply system in the E90 consists of the following:; Vehicle Electrical System
- Page 5 – Battery Connections; junction box located behind the glovebox.
- Page 6 – Rear Power Distribution
- Page 7 – Battery Safety Terminal
- Page 9 – The components of the IBS are shown below:
- Page 10 – IBS Measuring /Evaluation Function
- Page 11 – Servicing the IBS
- Page 12 – Terminal 15 Wake-up Signal Faults; • DME “ON”
- Page 13 – Vehicle Ground Points
- Page 14 – Classroom Exercise - Review Questions; What components make up the rear power distribution?
- Page 15 – NOTES
- Page 16 – Distribution Box; • Wiper stage 2; Note: The PC board is not serviceable; Junction Box
- Page 19 – Junction Box Electronic Control Module (JBE); Internal Relays
- Page 21 – What function does the Junction Box serve?
- Page 22 – Within the vehicle two groups of bus systems are used:; Bus Systems
- Page 23 – vates the central locking drive units.
- Page 24 – us S
- Page 26 – • Connection between MRS5 and TCU; BSD; Terminating resistors for:
- Page 27 – MOST Bus
- Page 28 – Light Direction
- Page 29 – Identification of Fiber Optics Conductors
- Page 30 – Diagnosis Information; Data Flow Interruption
- Page 32 – What module serves as the main gateway?
- Page 33 – Power Management
- Page 34 – Power Consumption During Operation; switch off loads as required.; Idle Speed Boost
- Page 35 – Electric Load Cut-Off with Engine Off
- Page 37 – Highlight modules that use
- Page 38 – erwise the relay is in the “On” position.; been reached (battery capacity is just enough to start the vehicle).; rent fault is provided.
- Page 41 – System Diagnosis Information
- Page 42 – Closed Circuit Current; The closed-circuit current on the E90 is:
- Page 43 – Transport Mode
- Page 45 – Workshop Exercise - Power Management
- Page 46 – Under what conditions is the circuit for term.30g_f switched off?
Initial Print Date: 03/05
Table of Contents
Subject
Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Battery Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Rear Power Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Battery Safety Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Intelligent Battery Sensor (IBS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
IBS Measuring /Evaluation Function . . . . . . . . . . . . . . . . . . . . . . . .10
Servicing the IBS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
IBS Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Voltage Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Current Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Terminal 15 Wake-up Signal Faults . . . . . . . . . . . . . . . . . . . . . . . .12
Distribution Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Junction Box Electronic Control Module (JBE) . . . . . . . . . . . . . . . . . . . .19
K-Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
K-Bus (protocol) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
LIN-Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
BSD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Terminating Resistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
MOST Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Light Direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Fiber Optics Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Identification of Fiber Optics Conductors . . . . . . . . . . . . . . . . . . .29
Power Consumption During Operation . . . . . . . . . . . . . . . . . . . . . . . . . . .34
E90 Voltage Supply & Bus Systems
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Summary
Voltage Supply & Bus Systems Model: E90 Production: From Start of Production 3 E90 Voltage Supply & Bus Systems After completion of this module you will be able to: • Understand the power distribution function • Explain the Power Management function • Diagnose current draw situations • Ident...
4 E90 Voltage Supply & Bus Systems Introduction The 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...
5 E90 Voltage Supply & Bus Systems Battery Connections Located 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. 1. One main cable is routed on the inte...
