This comprehensive Electrical Troubleshooting Manual provides detailed guidance for diagnosing and repairing electrical faults in 1990 - 1993 BMW 525i, 535i, and M5 (E34) models.

Key Features and Benefits:

Step-by-step troubleshooting procedures guide you through the diagnostic process, identifying potential causes and solutions.
Detailed electrical schematics and diagrams visually represent the electrical systems, aiding in component identification and circuit tracing.
Important specifications and measurements ensure accurate and efficient repairs.
Tailored specifically for the 1990 BMW 525i/535i/M5 (E34), catering to its unique electrical system configuration.
Empowers users to perform electrical repairs themselves, saving time and money while gaining a deeper understanding of their vehicle.

Technical Specifications and Details:

Electrical System:

12-volt negative ground system
Battery capacity: 60 Ah
Alternator output: 90 amps

Major Electrical Components:

Engine control module (ECM)
Ignition coil
Starter motor
Voltage regulator
Headlight switch
Turn signal switch
Wiper switch

Maintenance and Repair Information:

Battery Replacement:

Recommended battery: BMW-approved 12-volt battery with 60 Ah capacity
Battery location: Under the hood, on the passenger side

Fuse and Relay Replacement:

Fuse and relay panel locations:
Under the hood, next to the battery
Inside the cabin, under the dashboard
Fuse and relay identification: Refer to the electrical troubleshooting manual for specific locations and ratings

Electrical Troubleshooting:

Use a multimeter to measure voltage, current, and resistance
Inspect wiring harness for damage or loose connections
Consult the electrical troubleshooting manual for circuit testing procedures
Common Electrical Problems and Solutions:

Battery Drain:

Symptoms: Difficulty starting the vehicle, dim headlights
Solution: Check for parasitic drains using a multimeter, inspect battery terminals for corrosion

Electrical Shorts:

Symptoms: Blown fuses, intermittent electrical failures
Solution: Inspect wiring harness for damage, repair or replace damaged wires

Ground Faults:

Symptoms: Electrical components not functioning properly
Solution: Check ground connections for tightness and corrosion, clean or repair as needed
This comprehensive 1990 BMW 525i/535i/M5 (E34) Electrical Troubleshooting Manual is an indispensable resource for owners and technicians alike. Its detailed troubleshooting procedures, electrical schematics, and technical specifications empower you to diagnose and repair electrical faults with confidence and precision.

CONTENTS

Index
Introduction
Systematic Troubleshooting
Symbols
Power Distribution Charts
Fuse Charts
Power Distribution
Fuse Details
Ground Distribution
Diagnostic Link
Injection Electronics (DME 1.3)
Injection Electronics (DME M1.2, 6 Cylinder)
Charging System
Start
E- Box Fan
Electronic Transmission Control (AEGS)
Supplemental Restraint System (Air Bag)
Supplemental Restraint System (Air Bag)
Power Assist Steering (Servotronic)
Antilock Brake System (ABS)
Power Mirrors
ZKE Door Lock Heating (TSH)
ZKE Central Locking (ZV)
ZKE Power Windows (FH)
Power Seats
Heated Seats
ZKE Sunroof (SHD)
Central Body Electronics (ZKE)
Horn
ZKE Windshield Wiper Control (SWS)
Windshield Washer Jet Heaters
Instrument Cluster/ Check Control (K/ CC)
Light Switch Details
Lamp Monitor (LKM)
Lamp Monitor (LKM)
Headlights/ Fog Lights
Turn/ Hazard Lights
Park/ Tail/ Underhood Lights
License/ Trunk Lights
Back Up Lights
Brake Lights
ZKE Interior Lights (IB)
Glove Box Light/ Cigar Lighter/ Charging Plug
Park Ventilation With IHKR
Rear Window Defogger
Integrated Climate Regulation (IHKR)
Integrated Climate Regulation II (IHKR II)
Auxiliary Fan
Radio/ CD Player (Provisions)
Cellular Telephone (Provisions)
Cellular Telephone (Provisions)
Cruise Control (Tempomat)
On- Board Computer (BCIV)
Component Location Chart
Component Location Views
Splice Location Views
Connector Views Chart
Connector Views

Language: English
Format: PDF