BMW 840Ci 850Ci 850CSi E31 1994 Electrical Troubleshooting Manual

This comprehensive Electrical Troubleshooting Manual provides detailed guidance for diagnosing and repairing electrical faults in the 1994 BMW 8 Series – E31 (840CI, 850Ci, 850CSI) models produced between September 1993 and May 1994.

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 1994 BMW 8 Series – E31 (840CI, 850Ci, 850CSI), 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: 90 Ah
  • Alternator output: 140 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 90 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 1994 BMW 8 SERIES – E31 (840CI, 850Ci, 850CSI) Electrical Troubleshooting Manual (P/N 01 00 1 469 219) 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.


  • Introduction0
  • Symbols0
  • Power Distribution Chart
  • Fuse Chart0
  • Power Distribution
  • Fuse Details0
  • Ground Distribution
  • Data Link
  • Engine Control System (DME 1.7,12-Cylinder M70)
  • Engine Control System (DME M3.3. 8-Cvlinder M60)
  • Charging System
  • Start
  • Electronic Throttle Control (EML12-Cylinder)
  • E-Box Fan
  • Electronic Transmission Control (EGS 4HP-24)
  • Electronic Transmission Control (EGS: GS 9.20/A5S 560Z)
  • Electric Steering Column Adjustment
  • Steering Cloumn memory (LSM)
  • Supplemental Restraint System (AIR BAG)
  • Power Assist Steering (Servoctronic)
  • Active rear Axle Kinematics (AHK)
  • Slip Control (ABS)
  • Slip Control (ABS/ASC+T)
  • Slip Control 5 (ASC 5)
  • Electronic Shock Absorbr Control (EDC III+)
  • Power Mirrors
  • ZKE Door Lock Heating (TSH)
  • ZKE Central Locking (ZV)
  • ZKE Power Windows (FH)
  • Power Sun Shades
  • Power Seats
  • Seat/Mirror Memory System (SM/SPM)
  • Heated Seats
  • Lumbar Support
  • ZKE Sunroof (SHD)
  • Central Body Electronics (ZKE II)
  • Horn
  • ZKE Wiper/Washer Control
  • ZKE Windshield Wiper Pressure Control (ADV)
  • ZKE Headlight Washer (SRA)
  • Windshield Washer Jet Heaters
  • Body Electronics Module (EKM)
  • Instrument Cluster
  • Light Switch Details
  • Lamp Monitor (LKM)
  • Headlight/Fog Lights
  • Turn/Hazard Lights
  • Park/Tail/Underhood Lights
  • License Plate/Luggage compartment Lights
  • Back Up Lights
  • Brake Lights
  • ZKE Interior Lights (IB)
  • Interior Accessories
  • Crash Control Module
  • Park Ventilation With IHKA
  • Rear Window Defogger/Antenna
  • Automatic Heating/AC Control (IHKA)
  • Auxiliary Fan
  • Radio/Hifi
  • Cellular Telephone (Provisions)
  • Cruise Control (Tempomat)
  • Anti-Theft System IV (DWA IV)
  • Multi-Information Display (MID)
  • Remote Controlled Locking System
  • Component Location Chart
  • Component Location Views
  • Splice Location Views
  • Connector Views

Language: English
Format: PDF
Pages: 589

BMW 840Ci 850Ci 850CSi E31 1994 Electrical Troubleshooting Manual