Segment:
Compact Executive Sedan/Coupe/Convertible
Target Audience:
Enthusiasts, DIY mechanics, owners seeking to maintain or repair their E30 318i
Competitors Era:
Mercedes-Benz 190E, Audi 80/90, Alfa Romeo 75, Ford Sierra
Vehicle Highlights:
Rear-wheel drive dynamics, balanced chassis, relatively simple yet robust engineering, iconic design
Manual Benefit:
Empowers owners to perform their own electrical diagnostics and repairs, saving significant labor costs.
Manual Value Proposition:
Comprehensive visual guide to the E30 318i's electrical system, enabling accurate troubleshooting and repair.
Primary Coverage:
Complete Wiring Diagram
Secondary Coverage:
Electrical Systems, Component Location, Circuit Functionality
Estimated Pages:
Varies based on specific model year variants, typically 100-200+ pages for comprehensive wiring
Type:
Wiring Diagram Manual / Electrical Service Manual
Engine Management:
Fuel Injection (Bosch Motronic), Ignition System, ECU Wiring
Lighting:
Headlights, Taillights, Interior Lighting, Fog Lights, Turn Signals
Ignition:
Starter Motor, Ignition Switch, Spark Plug Wiring
Fuel:
Fuel Pump, Fuel Injectors, Fuel Pump Relay
Cooling:
Cooling Fan Relay, Temperature Sensor Wiring
Power Steering:
Power Steering Pump (if applicable for early models/specific markets), Warning Lights
Brakes:
Brake Light Switch, ABS Wiring (if equipped)
Suspension:
Self-Leveling Suspension (if equipped)
Accessories:
Wipers, Washers, Horn, Radio Wiring, Power Windows, Central Locking, Sunroof
Gauges Instruments:
Speedometer, Tachometer, Fuel Gauge, Temperature Gauge, Warning Lights
HVAC:
Blower Motor, Heater Control Valve, AC Compressor Clutch Wiring
Chassis Electronics:
ECU, Fuses, Relays, Ground Points
Troubleshooting:
Diagnostic procedures for electrical faults, fuse identification and testing, relay testing
Component Location:
Diagrams showing the physical location of electrical components, modules, and connectors
Wiring Repair:
Guidance on identifying wire colors, pinouts, and connector types for repairs and modifications
System Diagnosis:
Understanding the function of specific circuits and diagnosing common electrical issues
Depth:
Detailed schematic views, component identification, wire routing, connector pinouts, fuse and relay assignments
Applicability Detail:
Specific to E30 318i models, essential for diagnosing and repairing electrical faults
Searchability:
Likely text-searchable PDF (depends on original source quality)
Printability:
All pages printable for on-site use
Digital Format:
Instant Download (No physical binding)
Digital Storage:
Stored digitally, accessible on various devices with PDF reader
Operating Systems:
All Versions of Windows & Mac
Required Software:
Adobe PDF Reader
Type:
3-speed Automatic (ZF 3HP22)
Drivetrain:
Rear-wheel drive (RWD)
Manual Transmission Fluid:
API GL-4, SAE 75W-90 or 80W-90 (Consult specific manual for exact specification)
Automatic Transmission Fluid:
ATF Dexron II (Consult specific manual for exact specification)
Wheelbase:
approx. 2570 mm (101.2 in)
Length:
approx. 4325 mm (170.3 in)
Width:
approx. 1680 mm (66.1 in)
Height:
approx. 1380 mm (54.3 in)
Curb Weight:
approx. 1150-1250 kg (2535-2755 lbs)
Gross Vehicle Weight Rating:
Varies by model and options
Wheel Size Standard:
14-inch or 15-inch alloy or steel wheels
Tire Size Standard:
185/70 R14 or 195/65 R14 (early models), 195/60 R14 or 205/55 R15 (later models)
Crash Test Results:
Historically performed well for its era, though specific ratings vary by testing authority and year.
Brakes:
Front: Ventilated discs, Rear: Drums (later models may have rear discs). ABS optional.
Seatbelts:
3-point inertia reel seatbelts (front and rear)
Airbags:
Not standard on most E30 models, potentially optional on very late production examples.
Body Structure:
Reinforced passenger cell, crumple zones
Audio System:
Factory installed AM/FM radio with cassette player (various brands like Blaupunkt, Becker) often with optional premium sound.
On Board Computer:
Optional on some models, providing basic vehicle data like fuel economy, distance to empty, etc.
ABS:
Anti-lock Braking System (ABS) was an optional feature.
Diagnostic Ports:
OBD-I diagnostic connector (pre-OBD-II standard) for engine management system access.
Oil Change:
Every 5,000-7,500 miles or 6-12 months (depending on driving conditions and oil used)
Spark Plugs:
Every 20,000-30,000 miles (typical for period)
Timing Belt:
M10 engine uses a timing chain, requiring less frequent replacement but regular inspection.
Engine Oil:
API SG/SH, SAE 10W-40 or 20W-50 (Consult owner's manual for exact specification and climate suitability)
Coolant:
BMW Blue Coolant or equivalent ethylene glycol-based coolant, mixed 50/50 with distilled water.
Electrical:
Corrosion in connectors, faulty grounds, aging wiring insulation, intermittent issues with fuses/relays, OBC (On-Board Computer) issues.
Engine:
Head gasket leaks, oil pan gasket leaks, idle control valve issues, fuel injector issues.
Cooling System:
Plastic coolant expansion tank cracking, water pump leaks, thermostat failures.
Suspension:
Worn control arm bushings, shock absorber degradation.
Bmw Legacy:
BMW's reputation for building driver-focused, well-engineered vehicles.
E30 Development:
Successor to the E21, first generation 3 Series with significant chassis and powertrain updates, establishing the benchmark for compact sports sedans.
318I Positioning:
Entry-level gasoline model within the E30 range, offering a balance of economy and performance.
Production Period:
1982-1994 (E30 generation overall), 318i specifically from 1983/1984.
Manufacturing Locations:
Germany (primarily Dingolfing), also assembled in other countries.
