BMW 335i 2012-2018 Electrical Specifications
A comprehensive guide to the electrical specifications of the 2012-2018 BMW 335i, covering battery, alternator, wiring, and more. Essential for maintenance, repair, and upgrades.
Electrical Specifications Overview Specifications
This document provides a detailed overview of the electrical specifications for the 2012-2018 BMW 335i. It includes key electrical components, systems, and technical details. Use this guide to understand the electrical architecture, diagnose issues, and perform repairs. Navigate through the sections to find specific information, and use the search functionality to quickly locate details.
How to Use
To search for specific information, use the search bar at the top of the document. Enter keywords related to the electrical component or system you are looking for. Results will highlight relevant sections and subsections.
Navigate through the document by clicking on the section titles in the table of contents. Each section contains subsections with detailed technical specifications and explanations. Use the arrows or scroll to move between sections.
Key Specifications
Battery Voltage
12V
Alternator Output
180A
Charging System Voltage
13.5V - 14.5V
Starter Motor Voltage
12V
Electrical System Voltage
12V DC
Available Specifications
Battery and Charging System
This section covers the specifications and details of the battery, alternator, and charging system. It includes technical details, maintenance tips, and troubleshooting guidelines.
Battery and Charging System
This section covers the specifications and details of the battery, alternator, and charging system. It includes technical details, maintenance tips, and troubleshooting guidelines.
Battery Specifications
- Battery Type: Maintenance-Free AGM
- Voltage: 12V
- Capacity: 70Ah
- Cold Cranking Amps: 720 CCA
- Recommended Replacement Interval: 5-7 years
- Weight: Approximately 18 kg
Charging System Details
- Alternator Type: Bosch High-Efficiency Alternator
- Alternator Output: 180A
- Voltage Regulation: 13.5V - 14.5V
- Belt Driven System: Yes
- Recommended Belt Replacement: Every 50,000 miles
Electrical Wiring and Connectors
This section provides information on the electrical wiring, connectors, and circuit protection systems. It includes details on wire gauges, connector types, and fuse box locations.
Electrical Wiring and Connectors
This section provides information on the electrical wiring, connectors, and circuit protection systems. It includes details on wire gauges, connector types, and fuse box locations.
Wiring Harness Specifications
- Main Wiring Harness Material: Cross-linked polyethylene
- Primary Wire Gauge: 14 AWG
- Secondary Wire Gauge: 16 AWG
- Shielding: Twisted pair for critical circuits
- Sealing: Heat-shrink tubing and adhesive-lined connectors
Fuse Box Locations and Ratings
- Primary Fuse Box Location: Driver-side footwell
- Secondary Fuse Box Location: Engine compartment
- Main Fuse Ratings: 5A, 10A, 15A, 20A, 25A
- Circuit Protection: Blade fuses and relays
- Fuse Box Access: Requires removal of trim panels
Key Electrical Components
This section outlines the key electrical components, including the DME, ECU, and sensors. It provides technical specifications, communication protocols, and diagnostic tips.
Key Electrical Components
This section outlines the key electrical components, including the DME, ECU, and sensors. It provides technical specifications, communication protocols, and diagnostic tips.
Engine Control Unit (DME)
- DME Type: Bosch MEVD17.2
- Processor Speed: 80 MHz
- Memory: 4 MB Flash, 256 KB RAM
- Communication Protocol: CAN (Controller Area Network)
- Update Capability: Yes, via ISTA/D
Sensors and Actuators
- Crankshaft Position Sensor: Hall-effect type
- Camshaft Position Sensor: Magnetic reluctance type
- Mass Airflow Sensor: Hot-film type
- Oxygen Sensors: Heated wide-band type
- Fuel Injectors: Solenoid-type with 4-hole spray nozzles
Search Specifications
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Component Specifications
Overview
- Type
- High-Performance Electrical System
- Configuration
- Distributed Architecture with CAN Bus
- Platform
- N55 Engine Platform
- Voltage
- 12V DC
- Manufacturer
- BMW Group
Dimensions
- Battery Length
- 12.00 in (304.80 mm)
- Battery Width
- 6.80 in (172.72 mm)
- Battery Height
- 7.50 in (190.50 mm)
- Battery Weight
- 35.00 lbs (15.88 kg)
- Ecu Length
- 10.00 in (254.00 mm)
- Ecu Width
- 6.00 in (152.40 mm)
- Ecu Height
- 4.00 in (101.60 mm)
- Fuse Box Length
- 8.00 in (203.20 mm)
- Fuse Box Width
- 5.00 in (127.00 mm)
- Fuse Box Height
- 3.00 in (76.20 mm)
Materials
- Wiring Harness
- Copper Core with PVC Insulation
- Battery
- Lead-Acid Technology
- Connectors
- Nickel-Plated Brass
- Ecu Housing
- Aluminum with Epoxy Coating
- Fuses
- Zinc-Plated Copper
Features
- Power Management
-
- Energy Recuperation System
- Start-Stop Technology
- Intelligent Power Distribution
- Communication
-
- CAN Bus (Controller Area Network)
- LIN Bus (Local Interconnect Network)
- FlexRay High-Speed Bus
- Monitoring Systems
-
- Battery State Monitoring
- Voltage Regulation System
- Fault Detection and Isolation
- Control Systems
-
- Engine Control Module (ECM)
- Transmission Control Module (TCM)
- Dynamic Stability Control (DSC)
- Safety
-
- Airbag Control Module
- Anti-lock Braking System (ABS)
- Emergency Power Reserve
- Comfort
-
- Keyless Entry System
- Push-Button Start
- Ambient Lighting Control
Safety Features
- Crash Detection
-
- Collision Sensors
- Airbag Trigger System
- Emergency Systems
-
- Hazard Light Activation
- Emergency Battery Disconnect
- Protective Systems
-
- Overcurrent Protection
- Short Circuit Protection
Comfort Features
- Convenience
-
- Keyless Entry
- Push-Button Start
- Ambient Lighting
- infotainment
-
- Bluetooth Connectivity
- USB Ports
- Auxiliary Input
- Accessories
-
- Power Windows
- Power Mirrors
- Cruise Control
- Lighting
-
- LED Interior Lights
- Automatic Headlights
- Daytime Running Lights
Accessories
- Charging
-
- USB Ports
- 12V Power Outlets
- Cigarette Lighter Socket
- Mounting
-
- Dashboard Mount
- Seatback Mount
- Trunk Mount
- installation
-
- Wiring Harness
- Connectors
- Diagnostic Port
Maintenance
- Service interval
- Every 15,000 miles or 12 months
- Items
-
- Battery Terminal Cleaning
- Wiring Harness Inspection
- Fuse Box Check
- ECU Software Update
- Voltage Drop Test
- Notes
- Recommended to use BMW-approved parts and tools for maintenance.
Warranty
- Basic
- Miles: 50,000Years: 4Coverage: Electrical Components
- Powertrain
- Miles: 50,000Years: 4Coverage: Electrical Powertrain Components
- Electrical
- Miles: 50,000Years: 4Coverage: Electrical System
- Battery
- Miles: 100,000Years: 8Coverage: Battery and Charging System
Production Details
- Manufacturer info
- Name: BMW GroupLocation: Munich, GermanyFounded: 1916
- Manufacturing Process
-
- Robotic Assembly
- Laser Welding
- Automated Testing
- Quality Control
- inspection: 100% Electrical System CheckTesting: Functional and Performance TestingCertification: ISO 9001:2015
- Sustainability Practices
-
- Recyclable Materials
- Energy-Efficient Manufacturing
- Emission Reduction
- Production Metrics
- Units Per Year: Over 100,000 unitsCycle Time: Less than 24 hours per unitEfficiency: Over 95% defect-free rate
Service Information for Electrical System Service
Maintenance and service requirements specific to the electrical system of the 2012-2018 BMW 335i
- Battery Terminal Inspection and Cleaning
- Wiring Harness Check for Damage
- Fuse Box Inspection
- ECU Software Update Check
- Voltage Drop Test
Recommended to use BMW-approved tools and diagnostic equipment.
- Spark Plug Replacement
- Air Filter Replacement
- Fuel Filter Replacement
- Brake Fluid Check
- Electrical System Diagnostic Scan
Perform more thorough inspection of electrical connectors and wiring.
- Battery Replacement
- Wiring Harness Replacement (if damaged)
- Fuse Replacement (as needed)
- ECU Firmware Update
- Complete Electrical System Overhaul
Critical to follow manufacturer guidelines to avoid system damage.
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What are the technical specifications of the electrical system in the 2012-2018 BMW 335i?
What are the technical specifications of the electrical system in the 2012-2018 BMW 335i?
The 2012-2018 BMW 335i features a 12V electrical system with a maintenance-free battery, typically rated at 90Ah or 110Ah, depending on the model year and options. The alternator is a 210A high-output unit. The electrical system supports advanced features like Adaptive Brake Lights, automatic headlights, and rain sensor-activated windshield wipers. Compatibility with aftermarket accessories requires adherence to BMW's specified standards to avoid system malfunctions.
Q2 What are the maintenance requirements for the electrical system?
What are the maintenance requirements for the electrical system?
Regular maintenance includes checking battery terminals for corrosion, ensuring proper connections, and monitoring the battery's state of charge. Fuses and relays should be inspected every 30,000 miles. The alternator belt should be replaced every 50,000 miles. Additionally, software updates for electronic control units should be performed as recommended by BMW to maintain optimal performance.
Q3 How do I install or replace an electrical component?
How do I install or replace an electrical component?
When replacing electrical components, always disconnect the negative battery terminal first to prevent system damage. Consult the repair manual for specific procedures. Use BMW-approved tools and follow proper torque specifications. After installation, reconnect the battery and test the system to ensure functionality. For complex systems, consider consulting a certified BMW technician.
Q4 How do I troubleshoot common electrical issues?
How do I troubleshoot common electrical issues?
Start by checking the fuse box for blown fuses. Use a multimeter to test battery voltage, which should read 12.4V-12.7V when charged. If the battery is dead, jump-start the vehicle and let the alternator recharge it. For electronic issues, use BMW's ISTA/D diagnostic tool to identify fault codes. Common issues include faulty sensors, worn connections, or software glitches requiring updates.
Q5 How can I optimize the electrical system's performance?
How can I optimize the electrical system's performance?
Optimize performance by using high-quality, BMW-approved electrical components. Ensure all connections are clean and secure. Upgrade to a high-capacity battery if you've added aftermarket accessories. Regularly update software for all control modules to ensure compatibility and efficiency. Consider installing a capacitor to stabilize power supply for high-demand systems like audio or lighting.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
BMW 335i (2012-2018) Service Manual
Coming SoonComprehensive guide covering electrical system diagnostics, maintenance, and repair procedures.
Technical Service Bulletin - Electrical System Updates
Coming SoonDetails updates and improvements for the electrical system, including troubleshooting common issues.
BMW 335i Electrical Components Catalog
Coming SoonCatalog of genuine BMW parts and accessories for the electrical system, including wiring, sensors, and connectors.
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Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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