BMW 635CSI-M6 1988 Electrical TROUBLESHOOTING Manual

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🏷️ Basic Information Identification Make: BMW Model: 635CSi / M6 Year Covered By Manual: 1988 Variant Covered By Manual: 635CSi, M6 Codes Chassis Code: E24 👋 Introduction Market Position Vehicle...

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Type: Car

Vendor:

Sku: 307650

Tags: 1988 6 Series 635CSI BMW Car Cars M6

Product variants

Description

🏷️ Basic Information

Identification

Make:

Model:

635CSi / M6

Year Covered By Manual:

Variant Covered By Manual:

635CSi, M6

Codes

Chassis Code:

👋 Introduction

Market Position

Vehicle Segment:

Luxury Grand Tourer / Sports Coupe

Competitive Analysis

Competitors 1988:

Porsche 944, Mercedes-Benz SEC, Jaguar XJ-S

Key Features

Brand Philosophy:

'The Ultimate Driving Machine', blending performance, luxury, and sophisticated engineering.

Manual Purpose

Target Audience:

BMW owners, DIY mechanics, independent workshops

Manual Value Proposition

Cost Saving:

Enables significant cost savings by empowering owners and technicians to perform repairs themselves.

Manual Accessibility

Skill Level:

Accessible with basic mechanical knowledge, due to step-by-step explanations and illustrations.

📋 Manual Details

Coverage Areas

Primary Coverage:

Electrical Systems and Troubleshooting

Secondary Coverage:

Power Distribution, Component Locations, Wiring Diagrams

Page Count

Estimated Page Count:

Manual Type

Type:

Electrical Troubleshooting Manual / Service Manual

Language

Language:

English

Format

Format:

PDF (assumed digital delivery)

📖 Manual Coverage

Systems Covered

Power Management:

Power Distribution Charts, Fuse Charts, Fuse Details, Ground Distribution

Engine Management:

Engine Control System (L-Jetronic/Motronic for 635CSi, S38 ECU for M6), Data Link (OBD I)

Starting And Charging:

Start System, Charging System

Drivetrain Electronics

Transmission Control:

Electronic Transmission Control (if applicable to specific models covered)

Safety Systems

Restraint System:

Supplemental Restraint System (SRS) - Airbag (if equipped)

Traction Control:

Slip Control ABS (Anti-lock Braking System)

Comfort And Convenience

Mirrors:

Power Mirrors

Locking System:

Central Locking Module

Windows:

Power Windows

Seats:

Power Seats, Heated Seats

Sunroof:

Power Sun Roof

Horns:

Horn System

Wiper Washer:

Wiper/Washer Module, Headlight Washer, Windshield Washer Jet Heaters

Instrumentation

Cluster:

Instrument Cluster

Clock:

Multi-Function Clock

Lighting

Controls:

Light Switch Details

Exterior Front:

Headlights, Fog Lights, Turn/Hazard Lights

Exterior Rear Side:

Park/Tail/Underhood Lights, License Plate/Luggage Compartment Lights, Back-Up Lights, Brake Lights

Interior:

Interior Lights, Glove Box Light, Cassette Box Ashtray Lights, Charging Socket

Body Electronics

Crash System:

Crash Control Module

Climate Control:

Park/Ventilation with HKR (Heated Control Relay?), Rear Window Defogger, Integrated Climate Regulation

Audio Visual

Audio:

Radio/CD Player, Radio/HiFi System

Communication

Telephone:

Cellular Telephone System

Driver Assistance

Cruise Control:

Cruise Control (Tempomat)

Security

Anti Theft:

Anti-Theft System

Information Systems

Onboard Computer:

On-Board Computer

Component Locations

Component Identification:

Component Location Chart, Component Location Views

Wiring Diagrams

Splice Locations:

Splice Location Views

Connector Identification:

Connector Views

Procedures Included

Troubleshooting Methodology:

Step-by-step explanations, diagnostic flowcharts (implied by electrical troubleshooting)

Technical Depth

Diagnostic Level:

Advanced Electrical Diagnostics, Fault Finding

Repair Procedures:

Detailed repair instructions for electrical components and systems

Information Types:

Illustrations, Diagrams, Technical Specifications, Depth Illustrations

📊 Manual Specifications

File Format

Searchable Text:

Yes (typical for professionally produced PDFs)

Print Quality

Image Resolution:

High (essential for diagrams and illustrations)

Binding Type

Binding:

N/A (Digital PDF)

Paper Type

Paper Quality:

N/A (Digital PDF)

⚙️ Engine Specifications

Primary Engine 635Csi

Engine Code:

M30B34

Displacement:

3.4 Liters (3430 cc)

Configuration:

Inline 6-Cylinder, SOHC

Horsepower 635Csi:

218 hp @ 5,500 rpm (Euro Spec), approx. 182-190 hp (US Spec)

Torque 635Csi:

224 lb-ft @ 4,000 rpm (Euro Spec), approx. 214 lb-ft (US Spec)

Primary Engine M6

Engine Code:

S38B35

Displacement:

3.5 Liters (3453 cc)

Configuration:

Inline 6-Cylinder, DOHC (Double Overhead Camshafts)

Horsepower M6:

256 hp @ 6,500 rpm (Euro Spec), 210 hp (US Spec - ECE emissions) / 205 hp (US Spec - EPA)

Torque M6:

243 lb-ft @ 4,500 rpm (Euro Spec), 220 lb-ft (US Spec - ECE) / 215 lb-ft (US Spec - EPA)

Fuel System

Fuel Injection 635Csi:

Bosch L-Jetronic (later Motronic)

Fuel Injection M6:

Bosch Motronic DME (Digital Engine Electronics)

Fuel Type

Fuel Requirement:

Premium Unleaded Gasoline (91+ Octane)

🔧 Transmission

Standard 635Csi

Type 635Csi:

Getrag 4-Speed Automatic (ZF 4HP22)

Optional 635Csi

Type 635Csi:

Getrag 5-Speed Manual (G265)

Standard M6

Type M6:

Getrag 5-Speed Manual (G280)

Features

Clutch Type:

Single Dry Plate (Manual)

Fluid Specification

Automatic Transmission Fluid:

Dexron II (or equivalent, consult specific BMW specs)

Manual Transmission Fluid:

SAE 75W-90 Synthetic Gear Oil (or equivalent, consult specific BMW specs)

📐 Dimensions

Exterior

Length:

191.1 in (4854 mm)

Width:

70.5 in (1791 mm)

Height:

53.2 in (1351 mm)

Wheelbase

Wheelbase:

103.5 in (2629 mm)

Weights

Curb Weight 635Csi:

3,450 - 3,600 lbs (1565 - 1633 kg)

Curb Weight M6:

3,600 - 3,750 lbs (1633 - 1701 kg)

Gross Vehicle Weight Rating:

Approx. 4,400 lbs (2000 kg)

🛡️ Safety Features

Ratings

Crash Test Data:

NHTSA/IIHS data from this era is limited, but the E24 chassis was known for robust construction.

Active Features

Braking:

Four-wheel disc brakes with ABS (Anti-lock Braking System)

Steering:

Power-assisted recirculating ball steering

Passive Features

Airbags:

Driver-side airbag (optional, depending on market and build date)

Seatbelts:

Three-point inertia-reel seatbelts with front pretensioners

Chassis Construction:

Reinforced safety cage, crumple zones

💡 Technology Features

Infotainment

Audio System Options:

BMW Bavaria C/C II, C III, or premium HiFi systems with cassette player, optional CD changer.

Driver Assistance

ABS System:

Bosch ABS II system, providing anti-lock braking capability.

Connectivity

Cellular Phone Integration:

Factory or dealer-installed cellular telephone systems with external antennas and integrated microphone/speaker.

Onboard Computer

Obc Functionality:

Features like trip computer, average speed, average fuel consumption, range, and basic diagnostics.

Climate Control

HVAC System Type:

Manual or optional 'Integrated Automatic Climate Control' (ACC) for temperature and fan speed regulation.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 5,000-7,500 miles (8,000-12,000 km) or annually, whichever comes first.

Spark Plug Replacement:

Approximately 30,000 miles (48,000 km)

Coolant Flush:

Every 2-3 years or 30,000 miles (48,000 km)

Fluid Specifications

Engine Oil Type:

SAE 15W-50 or 20W-50 (for M30) / 10W-40 or 15W-40 (for S38), API SG or higher. Consult owner's manual for exact viscosity based on climate.

Engine Oil Capacity:

Approx. 6.5 - 7.0 quarts (6.2 - 6.6 liters) with filter change

Coolant Type:

Ethylene Glycol based, BMW blue coolant or equivalent

Brake Fluid Type:

DOT 4

Known Issues

Electrical Quirks:

Age-related failure of vacuum lines, faulty OBC display pixels, intermittent window/lock motors, degraded wiring insulation in engine bay.

Engine Common Problems:

Oil leaks from valve cover and oil pan gaskets, coolant leaks from hoses and metal pipes, potential head gasket issues if overheated.

Transmission Common Problems:

Slipping automatic transmissions, worn clutch components in manuals.

Common Maintenance Tasks

Tasks Covered By Manual:

Fuse replacement, relay testing, diagnosing power windows, power seats, central locking, lighting circuits, engine control sensor testing.

📚 Vehicle History

Brand Heritage

Bmw Legacy:

BMW's reputation for engineering excellence, sporty driving dynamics, and luxury motoring.

Model Evolution

E24 Generation:

The E24 generation, introduced in 1976, was BMW's sole large luxury coupe. The 635CSi was the high-performance variant of the 6 Series for most of its production. The M635CSi (later M6 in North America) was the ultimate expression of performance in this chassis.

Production

Production Period:

1976-1989

Manufacturing Location:

Germany (Dingolfing Plant)

Model Year 1988

Key Updates 1988:

By 1988, the E24 had received its 'highline' update, featuring revised aerodynamics, updated interior styling, and improved electronics. The M6 was a distinct performance variant with the more powerful S38 engine.

🏆 Awards & Recognition

Recognitions

Performance Accolades:

The M6 variant, in particular, was widely praised for its track-inspired performance and handling, earning accolades as one of the fastest production sedans/coupes of its time.

Ratings

Contemporary Reviews:

Consistently reviewed as a benchmark in the grand touring segment for its blend of luxury, comfort, and dynamic capability.

Certifications

Automotive Industry Standards:

Manufactured to meet all relevant German and international automotive safety and emissions standards of the era.