🏷️ Basic Information Identification Make: BMW Model: 840Ci / 850Ci / 850CSi Chassis Code: E31 Model Years Covered: 1994-1996 Production Date Range: September 1994 - August 1996 Codes Engine Code 840Ci: M60B40 (4.0L V8) Engine Code 850Ci: M70B50 (5.0L V12) Engine Code 850Csi: S70B56 (5.6L V12) 👋 Introduction Market Position Market Segment: Luxury Grand Tourer (GT) Competitive Analysis Key Competitors E31 Era: Mercedes-Benz SL-Class (R129), Porsche 928, Jaguar XJS Key Features Of E31 Design Philosophy: Sleek, aerodynamic styling with retractable headlights, long-distance comfort, and potent V8/V12 engines. Manual Utility Primary User: Professional BMW technicians, advanced DIY enthusiasts, and electrical diagnosticians. Manual Value Proposition Value For Buyers: Essential for diagnosing and repairing the complex electrical systems of these classic BMWs, which are prone to electrical gremlins. 📋 Manual Details Coverage Areas Coverage Scope: Comprehensive electrical system troubleshooting for 840Ci, 850Ci, and 850CSi models Page Count Estimated Page Count: N/A (Digital/Specific Focus) Manual Type Manual Type: Specialized Electrical Troubleshooting Manual Language Language: English Format Format: Digital (likely PDF) 📖 Manual Coverage Systems Covered Power Distribution Charts: Detailed diagrams of power flow throughout the vehicle's electrical systems. Fuse Charts And Details: Comprehensive listing of all fuses, their amperage ratings, circuit functions, and locations. Ground Distribution: Diagrams and explanations of all vehicle ground points and their functions. Data Link Connector: Information on the diagnostic connector (OBD-I/BMW proprietary) and its use. Engine Control System: Troubleshooting for critical engine management systems (DME) including sensors, actuators, and control modules. Charging System: Diagnosis of alternator, voltage regulator, and battery charging circuits. Starting System: Troubleshooting procedures for the starter motor, ignition switch, and related circuits. Electronic Transmission Control: Diagnosis and troubleshooting for the transmission control module (EGS) and related sensors/actuators. Supplemental Restraint System: Troubleshooting for airbags and seatbelt pre-tensioners (SRS), including sensor and module diagnostics. Slip Control ABS: Diagnosis of the Anti-lock Braking System (ABS) and potentially Traction Control (ASC+T). Power Mirrors: Troubleshooting for mirror adjustment and heating circuits. Central Locking Module: Diagnosis of the central locking system, including key fobs (if applicable for the year) and door lock actuators. Power Windows: Troubleshooting for window regulators, motors, and switch assemblies. Power Seats: Diagnosis of seat adjustment motors, switches, and memory functions. Heated Seats: Troubleshooting for seat heating elements and control modules. Power Sun Roof: Diagnosis of sunroof motor, switch, and mechanism operation. Horn: Troubleshooting for the horn circuit, including the horn button, relay, and horns themselves. Wiper Washer Module: Diagnosis of windshield wiper motors, park mechanism, and washer pump circuits. Headlight Washer: Troubleshooting for the headlight washer pump, nozzles, and activation circuits. Windshield Washer Jet Heaters: Diagnosis of heating elements for washer fluid jets. Instrument Cluster: Troubleshooting for gauges, warning lights, and the central information display. Multi Function Clock: Diagnosis of the clock and its associated functions (e.g., trip computer integration). Light Switch Details: Troubleshooting for the main light switch and its various illumination functions. Headlights Fog Lights: Diagnosis of headlight and fog light circuits, including bulbs, relays, and control modules. Turn Hazard Lights: Troubleshooting for turn signal and hazard light systems, including flasher units and indicators. Park Tail Underhood Lights: Diagnosis of parking lights, taillights, and interior underhood illumination. License Plate Luggage Compartment Lights: Troubleshooting for license plate illumination and trunk/luggage compartment lighting. Back Up Lights: Diagnosis of reverse light circuits. Brake Lights: Troubleshooting for brake light operation, including the brake light switch. Interior Lights: Diagnosis of dome lights, vanity mirror lights, and other interior illumination. Glove Box Cassette Ashtry Lights Charging Socket: Troubleshooting for minor interior lighting and power outlets. Crash Control Module: Diagnosis related to the crash data recorder or impact sensor systems. Park Ventilation With Hkr: Troubleshooting for parking ventilation systems and potentially heated catalytic converter (HKR) functions. Rear Window Defogger: Diagnosis of the rear defroster grid and its control circuit. Integrated Climate Regulation: Troubleshooting for the automatic climate control system, including HVAC blower, blend doors, and sensors. Radio Cd Player: Diagnosis of the audio system head unit and CD player. Radio Hifi: Troubleshooting for premium audio systems, amplifiers, and speaker circuits. Cellular Telephone: Diagnosis of integrated or aftermarket mobile phone systems. Cruise Control Tempomat: Troubleshooting for the cruise control system, including switches, actuators, and control modules. Anti Theft System: Diagnosis of the factory alarm and immobilizer systems. On Board Computer: Troubleshooting for the OBC functions, display, and input. Component Location Charts And Views: Visual guides and diagrams indicating the physical location of electrical components. Splice Location Views: Visual guides to wire splice locations for easier circuit tracing and repair. Connector Views: Detailed illustrations and pinout information for various electrical connectors. Procedures Included Troubleshooting Methodology: Step-by-step diagnostic procedures for identifying electrical faults, including symptom-based troubleshooting. Wiring Diagram Interpretation: Guidance on understanding and utilizing complex wiring diagrams specific to the E31 chassis. Fuse And Relay Testing: Procedures for testing fuses, relays, and their associated circuits. Component...