BMW 735i 1985 Electrical Troubleshooting Manual

This comprehensive Electrical Troubleshooting Manual provides detailed guidance for diagnosing and repairing electrical faults in the 1985 BMW 735i model.

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 1985 BMW 735i, 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: 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 BMW 735i 1985 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.

INDEX

• How to use this manual
• Symbols
• Systematic Troubleshooting
• Diagnostic Connector
• Power Distribution Box
• Fuse Data
• Accessory Connector
• Power Distribution
• Fuse Details
• Light Switch Details
• Block Diagram For 735i Engine Controls
• Charging System
• Start
• Fuel Delivery/ Fuel Control/ Idle Speed Control
• Fuel Delivery/ Fuel Control
• Fuel Control
• Fuel Control/ Ignition
• On- Board Computer
• Speedometer/ Gauges/ Warning Indicators
• Gauges/ Warning Indicators
• Warning Indicators
• Ignition Key Warning/ Seatbelt Warning
• Service Interval Indicator
• Active Check control
• Brake Lining Warning
• Interior Lights
• Headlights/ Fog Lights
• Lights: Turn/Hazard Warning
• Lights: Front/ Park/ Tail/ Underhood
• Lights: Rear Marker/ License/ Trunk
• Stoplights/ Cruise Control
• Light: RH Visor/ Dash/ Transmission Range
• Lights: Dash/ Transmission Range
• Center Console Lights
• Back Up Lights
• Cigar Lighter/ Glove Box/ Auto Charging Flashlight
• Horn
• Heated Door Lock
• Power Windows
• Central Locking
• Power Mirrors
• Radio/ Power Antenna
• Power Seats
• Antilock Braking System (ABS)
• Wiper/Washer
• Rear Defogger/ Sunroof
• Windshield Washer Jet Heaters
• Auxiliary Fan/ Vacuum Pump
• Automatic Heater- Air Conditioner
• Rear Passenger Area Solenoid Valve Control
• Fresh Air and Recirculation Air Solenoid Valves Control
• Defrost Solenoid Valve Controls
• Water Valve Solenoid Control
• Temperature Control Loop
• Vent Stage and Footwell Solenoid Valve Control
• Ground Distribution
• Index- Splice Locations
• Splice Locations For ABS Harness
• Splice Location For A/ C Harness
• Splice Location For Rear Harness
• Splice Location For Front Harness
• Splice Location For Middle Harness
• Splice Location For Engine Harness
• Component Locations
• Connector Views

Language: English
Format: PDF
Pages: 121

BMW 735i 1985 Electrical Troubleshooting Manual