1990 1991 BMW 991 525i 535i M5 E34 Electrical Troubleshooting Manual 408 Pages

The document is an electrical troubleshooting manual for 1991 BMW 525i, 535i, and M5 (E34) models. It includes detailed schematics, component locations, fuse charts, and system overviews for diagnosing and repairing vehicle electrical systems, covering components like relays, sensors, and control units.

The Electrical Troubleshooting Manual (ETM) covers the BMW 525i, 535i, and M5 models from the year 1991.

Electrical Troubleshooting Manual Overview

•    Fuse and Ground Distribution: Fuse details and ground distribution are referenced in cells 0670.3 and 0670.4.

•    Component Locations: Detailed charts and views for locating components in the vehicle.

•    Symbols and Conventions: Circuit symbols and schematic conventions explained in cells 0140.0 and 7000.0.

•    Power Distribution: Front and rear power distribution box layouts provided with relay details.

•    Diagnostic Modules: Locations for SRS, Servotronic, and other control units specified.

•    Engine Sensors: Placement of oxygen, speed, temperature, and air mass sensors detailed.

•    Relays: Locations of various relays, including hazard flasher, defogger, and compressor control.

•    Connectors: Pin and connector details for multiple components, including memory seats and mirrors.

•    Wiring Schematics: Schematics show current paths from positive to negative, omitting scale details.

•    Integrated Climate Control: Components and locations for IHKR2 system described.

•    System Overviews: Block diagrams provide relationships between components (e.g., ABS, AC).

•    Ignition and Transmission: Switches and controls for ignition and electronic transmission systems outlined.

•    Crash Sensors: Placement of left and right front crash sensors near shock towers.

•    Electrical Troubleshooting Manual (ETM): Covers electrical systems for BMW 525i, 535i, and M5 models from 1991, detailing components, wiring, and schematics.

•    Component Locations: Includes charts and diagrams for locating electrical components like sensors, relays, and control units across various vehicle sections.

•    Schematics Overview: Schematics are organized by circuits, showing current paths from positive to negative, with omitted connectors for clarity.

•    Fuse and Ground Distribution: Detailed charts for fuses and ground points, including their specific locations and functions.

•    Symbols and Conventions: Explains symbols used in diagrams, such as relays, switches, and wiring, along with general conventions for interpreting schematics.

•    Block Diagrams: Provides system overviews (e.g., ABS, EGS, AC) to illustrate component relationships and control unit interactions.

•    Relay and Connector Details: Lists relays, connectors, and their pin configurations for troubleshooting and repairs.

•    Specialized Components: Highlights key systems like the DME, EML, and climate control units, with precise installation locations.

The Electrical Troubleshooting Manual (ETM) for the 1991 BMW 525i, 535i, and M5 models includes the following types of information:

1.    Power Distribution and Fuse Details:
    
•    Charts and diagrams outlining the power distribution system.
    
•    Detailed fuse charts, including specific fuses and their functions.

2.    Ground Distribution:
    
•    Ground point locations and their connections within the vehicle.

3.    Component Locations:
    
•    Comprehensive charts and diagrams to locate various electrical components, connectors, and ground points.

4.    Connector Views:
    
•    Illustrations of connectors with more than three pins for accurate identification and troubleshooting.

5.    Block Diagrams:
    
•    Foldout diagrams providing an overview of the entire system (e.g., ABS, EGS, AC), showing relationships between components and control units.

6.    Symbols and Conventions:
    
•    Explanation of symbols, wiring conventions, and schematic interpretation for easier understanding of diagrams.

7.    Specialized Systems:
    
•    Information on key systems such as Digital Engine Electronics (DME), Electronic Throttle Control (EML), and Integrated Climate Regulation (IHKR2).

8.    Splice and Wiring Details:
    
•    Splice locations and wiring paths, including wire colors and cross-sections.

9.    Relay and Fuse Details:
    
•    Specific relays, their locations, and associated circuits for troubleshooting purposes.

10.    Photographic Component Views:
    
•    Photographs of hard-to-locate components and connectors for easier identification.
This manual serves as a detailed guide for diagnosing and repairing electrical issues in these BMW models.

The schematics in the Electrical Troubleshooting Manual (ETM) for the 1991 BMW 525i, 535i, and M5 models are organized as follows:

1.    Introduction and Symbols:
    
•    The manual begins with an explanation of symbols and conventions used throughout the schematics to help interpret the diagrams effectively.

2.    Power Distribution and Fuse Details:
    
•    Power distribution charts and fuse charts are included to show the flow of power and the specific fuses associated with various systems.

3.    Component Locations:
    
•    A Component Location Chart lists important connectors, ground points, and components in a tabular format, providing precise descriptions of their locations.
    
•    The Component Location Views section includes photographs of difficult-to-locate components and connectors.

4.    Connector Views:
    
•    Detailed illustrations of connectors with more than three pins are provided in the Connector Views section to aid in identification and troubleshooting.

5.    Block Diagrams:
    
•    Foldout block diagrams provide an overview of major systems (e.g., ABS, EGS, AC). These diagrams show the relationships between components and control units, helping users understand the overall system design.

6.    Wiring and Splice Details:
    
•    The manual includes detailed information on wiring paths, splice locations, wire colors, and cross-sections to assist with troubleshooting and repairs.

7.    Ground Distribution:
    
•    A dedicated section maps out the ground distribution points and their connections.
This structured organization ensures that users can systematically diagnose and repair electrical issues in these BMW models.

The index in the 1991 BMW 525i, 535i, and M5 Electrical Troubleshooting Manual (ETM) provides a structured overview of the content, helping users quickly locate specific sections or topics. It includes:

•    Symbols and Introduction: Explanation of symbols and conventions used in the manual.

•    Power Distribution and Fuse Details: Charts and diagrams for the power and fuse systems.

•    Ground Distribution: Mapping of ground points and their connections.

•    Component Location: Charts and views showing where components are located.

•    Connector Details: Charts and visual representations of connectors.

•    System-Specific Diagrams: Detailed schematics for various systems like ABS, EGS, IHKR2, and others.
This organization ensures efficient navigation for troubleshooting and repair tasks.

The chapters in the 1991 BMW 525i, 535i, and M5 Electrical Troubleshooting Manual (ETM) are organized as follows:

1.    IntroductionOverview of the manual, including conventions, symbols, and general usage guidelines.

2.    SymbolsExplanation of the symbols used in the schematics for easier interpretation.

3.    Power Distribution ChartDetails the power flow and connections throughout the vehicle.

4.    Fuse ChartLists all fuses and their associated circuits.

5.    Ground DistributionProvides a map of ground points and their connections.

6.    Component Location ChartA tabular list of important connectors, ground points, and components with their precise locations.

7.    Component Location ViewsPhotographic and diagrammatic views of components and connectors that are difficult to locate.

8.    Splice Location ViewsDetails the locations of splices in the wiring system.

9.    Connector Views ChartIllustrations of connectors with more than three pins for identification and troubleshooting.

10.    Connector ViewsDetailed diagrams for connectors, aiding in repair and diagnostics.

11.    System-Specific DiagramsFoldout block diagrams for major systems like ABS, EGS, and climate control, showcasing the relationships between components and control units.

12.    Detailed SchematicsComprehensive electrical schematics for individual circuits and systems in the vehicle.
These chapters are designed to systematically guide users through troubleshooting and repairing the electrical systems of the vehicle.

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