BMW 735L 735IL 750IL 1988 Electrical Troubleshooting

This comprehensive Electrical Troubleshooting Manual provides detailed guidance for diagnosing and repairing electrical faults in the 1988 BMW 735I, 735IL, and 750IL (E32) models produced between September 1987 and August 1988.

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 1988 BMW 735I/735IL/750IL (E32), catering to their unique electrical system configurations.
• 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: 80 Ah
• Alternator output: 120 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 80 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 1988 BMW 735I/735IL/750IL (E32) Electrical Troubleshooting Manual (P/N 89 89 1 000 825) 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

• Introduction
• Introduction
• Systematic Troubleshooting
• Symbols
• Power Distribution Charts
• Fuse Charts
• Power Distribution
• Fuse Details
• Ground Distribution
• Diagnostic Link
• E- Box Fan
• Charging System
• Start
• Injection Electronics (DME 1.1)
• Injection Electronics (DME/ EML 1.2) Early Production 750iL
• Injection Electronics (DME/ EML 1.2) Late Production 750iL
• Electronic Throttle Control (EML 1.2)
• Electronic Transmission Control (AEGS)
• Electronic Transmission Control (AEGS)
• Electronic Transmission Control (AEGS/ EML)
• Supplemental Restraint System (Air Bag)
• Power Assist Steering (Servotronic)
• Brake Lining Warning
• Antilock Brake System (ABS)
• Memory Mirrors
• Door Lock Heating (ZKE)
• Central Locking System (ZKE)
• Power Windows (ZKE)
• Power Seats
• Memory Seat
• Lumbar Support
• Heated Seats
• Automatic Rear Headrest
• Sunroof (ZKE)
• Sunroof (ZKE)
• Central Body Electronics (ZKE)
• Horn
• Windshield Wipers (ZKE)
• Windshield Washer (ZKE)
• Headlights/ Fog Light Washer (ZKE)
• Windshield Wiper Pressure Control (ZKE)
• Windshield Washer Jet Heaters
• Instrument Cluster/ Check Control
• Light Switch Details
• Lamp Monitor (LKM)
• Turn/ Hazard Lights
• Headlights/ Fog Lights
• Park/ Tail/ Marker/ Underhood Lights
• License/ Trunk Lights
• Back Up Lights
• Brake Lights
• Back Up Lights
• Brake Lights
• Interior Lights (ZKE)
• Glove Box Light/ Cigar Lighter/ Ashtray Light/ Flashlight Charging Plug
• Park Ventilation
• Rear Window Defogger
• Automatic Climate Contrrol (IHKA)
• Auxiliary Fan
• Radio/ CD Player (Provisions)
• Cellular Telephone (Provisions)
• Cruise Control (Tempomat) Early Production 735i, 735iL
• Cruise Control (EML)
• Antitheft System (DWA)
• On- Board Computer
• Infrared Locking (IRS)
• Component Location Chart
• Component Location Views
• Splice Location Views
• Connector Views

Language: English
Format: PDF
Pages: 495

BMW 735L 735IL 750IL 1988 Electrical Troubleshooting