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1987 BMW L6-M6 Electrical TROUBLESHOOTING Manual
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🏷️ Basic Information Identification Make: BMW Model: M6 (marketed as L6 in some markets) Model Variant: L6 / M6 Model Year: 1987 Body Style: Premium grand tourer (GT) coupe Chassis...
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🏷️ Basic Information
Identification
Make:
BMW
Model:
M6 (marketed as L6 in some markets)
Model Variant:
L6 / M6
Model Year:
1987
Body Style:
Premium grand tourer (GT) coupe
Chassis Code:
E24
Engine Code:
S38B35
Vehicle Focus
Positioning:
High-performance, luxury vehicle of the late 1980s
Variant Focus:
Higher-performance version of the E24 chassis with a motorsport-derived engine
👋 Introduction
Market Position
Segment:
Premium Grand Tourer (GT) coupe
Era:
Late 1980s high-performance luxury market
Competitive Analysis
Competitors:
Porsche 911, Ferrari 412, Aston Martin V8 Vantage
Advantage:
Hand-built craftsmanship and motorsport-derived inline-six engineering
Key Features
Distinguishing Features:
Hand-built craftsmanship, powerful inline-six engine, sophisticated suspension, luxurious interior
Styling:
Distinctive motorsport-derived styling
Performance Focus:
Motorsport-derived engine in the M6 (or L6 in some markets) variant
📋 Manual Details
Coverage Areas
Primary Coverage:
Electrical systems and troubleshooting
Secondary Coverage:
Engine control, powertrain electronics, comfort and convenience systems
Manual Type & Size
Manual Type:
Specialized electrical troubleshooting manual
Page Count:
200-300 pages (estimated, based on typical E24 electrical manuals of the era)
Technical Depth:
Comprehensive - targets professional technicians and advanced DIY owners
Language & Format
Language:
English
File Format:
PDF (searchable digital download)
Delivery:
Instant digital download
Binding:
Digital - no physical binding
📖 Manual Coverage
Systems Covered
Engine Management:
Engine control system, charging system, start system
Powertrain Electronics:
Electronic transmission control (automatic variants)
Safety Systems:
Supplemental Restraint System (SRS airbag, if equipped), ABS slip control
Comfort & Convenience:
Power mirrors, central locking module, power windows, power seats, heated seats
Body Equipment:
Power sunroof, horn, wiper/washer module, headlight washer, windshield washer jet heaters
Lighting:
Headlights/fog lights, turn/hazard, park/tail/underhood, brake, back-up, interior and license plate lights
Instrumentation:
Instrument cluster and light switch details
Climate Control:
Park ventilation with HKR, rear window defogger, integrated climate regulation
Infotainment Electronics:
Radio/CD player, radio/Hi-Fi, cellular telephone, cruise control (Tempomat)
Security & Information:
Anti-theft system, on-board computer
Crash Control Module:
Coverage related to airbag deployment and safety system monitoring
Procedures Included
Troubleshooting:
Step-by-step diagnostic procedures and symptom-based troubleshooting guides
Fault Codes:
Fault code interpretation where applicable to the era's diagnostics
Component Diagnostics:
Specific tests for electrical components, sensors, actuators, and control modules
Test Equipment:
Diagnostic connector information; multimeter voltage, resistance, and continuity testing
Wiring Analysis
Power Distribution:
Power distribution charts and fuse charts
Ground Distribution:
Ground distribution charts and detailed ground point diagrams
Data Link:
Data link information for identifying circuit functions and connections
Diagrams & References
Wiring Diagrams:
Detailed color-coded wiring diagrams for all electrical systems
Component Location:
Location charts and views to identify the physical position of electrical parts
Connector Identification:
Connector views to aid harness troubleshooting
Organization:
Organized by system with an index and an introduction to symbols and basic electrical theory
📊 Manual Specifications
File & Compatibility
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print & Binding
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
⚙️ Engine Specifications
Primary Engine
Engine Type:
Naturally aspirated inline-6 cylinder
Displacement:
3.5 liters (3,430 cc)
Engine Code:
S38B35
Performance
Horsepower:
256 hp @ 6,300 rpm (M635CSi figure; L6 similar or slightly detuned)
Torque:
330 Nm (243 lb-ft) @ 4,500 rpm (M635CSi figure)
Fuel System & Features
Fuel Delivery:
Bosch Motronic electronic fuel injection (EFI)
Valve Train:
DOHC, 4 valves per cylinder
Compression Ratio:
10.5:1
Induction:
Individual throttle bodies (ITBs) on M635CSi/M6 for distinctive response
🔧 Transmission
Gearbox
Standard Transmission:
5-speed manual (Getrag 280/5 or similar)
Optional Transmission:
4-speed automatic (ZF 4HP22)
Clutch
Clutch Type:
Hydraulically actuated single dry plate clutch
📐 Dimensions
Exterior
Length:
Approx. 4,750 mm (187.0 in)
Width:
Approx. 1,730 mm (68.1 in)
Height:
Approx. 1,380 mm (54.3 in)
Wheelbase:
Approx. 2,570 mm (101.2 in)
Weights
Curb Weight:
Approx. 1,500-1,600 kg (3,300-3,520 lbs)
🛡️ Safety Features
Ratings
Crash Test Data:
N/A - no official NHTSA or Euro NCAP ratings for this vintage; E24 known for robust construction
Active Features
Braking System:
Four-wheel Anti-lock Braking System (ABS)
Suspension:
Independent front and rear suspension, often with self-leveling rear suspension
Passive Features
Airbags:
Driver's side airbag (standard on later cars; may be optional on early 1987 models - verify within manual)
Seatbelts:
Three-point inertia-reel seatbelts
💡 Technology Features
Infotainment
Audio System:
Optional premium Hi-Fi systems with separate amplifiers and component speakers
Head Units:
Radio/cassette or radio/CD player units
Driver Assistance
Cruise Control:
Tempomat cruise control, standard on L6/M6 variants
Traction:
ABS standard; early traction control not common for this model year
Connectivity & Displays
Telephone:
Optional integrated cellular telephone system
Onboard Computer:
Basic diagnostics, trip computer functions, and system checks
🔧 Maintenance
Service Intervals
Oil Change:
Typically every 5,000-7,500 miles or 12 months (exact interval detailed in manual)
Spark Plugs:
Approximately every 30,000 miles (type and gap specified in manual)
Fluid Specifications
Engine Oil:
SAE 15W-50 or 20W-50, API SG or higher; capacity approx. 5.5-6.0 liters
Coolant:
BMW coolant or equivalent ethylene glycol mix with corrosion inhibitors (50/50); approx. 10-12 liters
Brake Fluid:
DOT 3 or DOT 4 (check manual); annual flush recommended
Transmission Fluid:
Manual: SAE 75W-90 GL-4 gear oil; Automatic: ZF TE-ML 11A/B or equivalent
Known Issues
Electrical:
Aging wiring insulation, faulty relays (central locking, wipers), headlight seal leaks, fuse box corrosion
Engine Ancillary:
Cooling system components (radiator, hoses, water pump), fuel pump reliability, idle control valve issues
📚 Vehicle History
Brand Heritage
Manufacturer:
BMW - reputation for driver-focused, high-performance vehicles with advanced engineering
Motorsport Link:
M6/L6 engines derived directly from BMW Motorsport development
Model Evolution
Generation:
E24 - the first BMW 6 Series, launched in 1976
Production Years:
E24 generation 1976-1989; M635CSi/L6 variants 1983-1989
Manufacturing Location:
Germany
🏆 Awards & Recognition
Recognitions
Documented Awards:
N/A - no specific awards are documented in the source material
Standing
Collector Standing:
The E24 M6/L6 is regarded as a pinnacle of performance and luxury for its generation
Engineering Recognition:
Hand-built S38-based inline-six reflects BMW Motorsport engineering of the era