BMW 335i 2005-2011

BMW 335i 2005-2011 Electrical Specifications

Discover the essential electrical specifications for the BMW 335i (E90/E92/E93) from 2005-2011. This guide covers battery, alternator, wiring, and electronics, aiding diagnostics, repairs, and upgrades for technicians and enthusiasts.

Updated Feb 10, 2025

Electrical Specifications Overview Specifications

This document provides a comprehensive overview of the electrical specifications for the 2005-2011 BMW 335i. It includes detailed information on battery, charging, wiring, and electrical systems. Use this guide to understand key electrical components, their functions, and specifications. Navigate through the sections to find specific details or use the search functionality to locate particular information quickly.

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Key Specifications

▲

Battery Capacity

70 Ah

■

Alternator Output

120 A / 12 V

●

System Voltage

12 V DC

◆

Fuse Box Location

Driver-side footwell and trunk

★

Headlight Wattage

35 W per bulb

Available Specifications

Battery and Charging System

This section details the specifications and requirements for the battery and charging system in the 2005-2011 BMW 335i. It covers battery type, capacity, charging rates, and related components.

Battery Specifications

Type: Maintenance-free, AGM (Absorbent Glass Mat)
Capacity: 70 Ah (Ampere-hours)
Voltage: 12 V
Cold Cranking Amps (CCA): 600 CCA
Reserve Capacity: 90 minutes
Weight: Approximately 18 kg (39.7 lbs)

Charging System

Alternator Type: Bosch 120 A
Alternator Output: 120 A / 12 V
Voltage Regulation: 14.2-14.4 V
Belt Driven: Yes
Recommended Charging Rate: 10% to 90% in 6 hours

Electrical System Overview

This section provides an overview of the electrical system architecture, including wiring, fuses, and key electrical components.

Fuse Box and Relays

Location: Driver-side footwell and trunk
Type: Blade-style fuses
Main Fuse Box Capacity: Up to 80 A
Relay Module: Integrated into fuse boxes
Fuse Rating: 5 A to 40 A

Wiring and Connectors

Wiring Harness Material: Copper core with PVC insulation
Connector Type: Weatherproof (IP67 rated)
Main Bus Voltage: 12 V DC
Grounding System: Chassis ground
CAN Bus Speed: 500 kbps

Lights and Accessories

This section covers the electrical specifications for lighting and accessory systems, including bulbs, circuits, and control modules.

Exterior Lighting

Headlight Type: Bi-Xenon (HID)
Headlight Wattage: 35 W per bulb
Taillight Type: LED
Turn Signal: 21 W
Fog Light: 55 W

Interior Lighting

Dashboard Lighting: LED
Cabin Lights: 5 W
Trunk Light: 10 W
Door Illumination: LED
Ambient Lighting: Optional LED

Search Specifications

Search by specification name, value, or description

Component Specifications

Overview

Type: Engine Control Unit (ECU)

Configuration: Distributed electrical system

Platform: E90/E91/E92/E93

Voltage: 12V DC

Location: Main ECU under hood, secondary units in cabin

Dimensions

Battery Capacity: 45Ah

Battery Dimensions: 230mm x 170mm x 220mm

Alternator Size: 150mm x 170mm x 200mm

Wiring Harness Length: 100 meters

Fuse Count: 20-30 fuses

Main Relay Dimensions: 50mm x 30mm x 35mm

Electrical Control Module: 250mm x 200mm x 80mm

Materials

Wiring Harness: Copper core with PVC insulation

Connectors: Nickel-plated brass

Fuses: Tin-plated copper

Battery Terminals: Lead with tin plating

Features

Power Management

Battery monitoring system
Alternator control module
Load management system

Communication

CAN (Controller Area Network)
LIN (Local Interconnect Network)
K-CAN (Body Controller Area Network)

Safety

Circuit protection
Airbag control unit
Anti-lock braking system (ABS) integration

Comfort

Automotive lighting control
Seat heating control
Climate control system

Diagnostics

OBD-II (On-Board Diagnostics II)
Real-time system monitoring
Fault code memory

Safety Features

Electrical Safety

Circuit protection
Overcurrent protection

Airbag System: Integrated with electrical system

Anti Theft: Immobilizer system

ABS integration: Integrated ABS control

Comfort Features

Lighting

LED lighting
Automatic dimming
Ambient lighting

Seating

Heated seats
Memory seats
Ventilated seats

Climate Control

Automatic climate control
Dual-zone climate control
Air quality sensor

Accessories

Battery Accessories

Battery maintainer
Battery tester

Wiring Accessories

Wiring harness kit
Connectors

Diagnostic Tools

OBD-II scanner
Code reader

Maintenance

Service interval: Every 12 months or 15,000 km

Service Items

Battery test
Alternator belt inspection
Fuse and relay check
Wiring harness inspection
ECU software update

Maintenance Notes: Recommended to use BMW-approved parts and tools

Warranty

Basic Warranty: Miles: 50,000 miles
Years: 4 years
Coverage: Bumper-to-bumper

Powertrain Warranty: Miles: 100,000 miles
Years: 5 years
Coverage: Drivetrain components

Corrosion Warranty: Miles: Unlimited miles
Years: 12 years
Coverage: Perforation due to corrosion

Battery Warranty: Miles: 100,000 miles
Years: 8 years
Coverage: Battery and electrical components

Production Details

Manufacturer: BMW Group

Manufacturing Process

Robotic welding
Automated assembly lines
Laser welding
Quality control testing

Quality Control: Testing Procedures: Functional testing, Durability testing, Environmental testing
Certifications: ISO 9001, IATF 16949

Sustainability Practices: Recyclable materials, energy-efficient production

Production Metrics: Units Produced: Over 500,000 units
Production Years: 2005-2011
Production Facilities: Munich, Germany and other locations

Service Information for electrical Service

Maintenance and service requirements specific to the electrical system

5,000 miles

6 months

Battery terminals inspection
Alternator belt check
Fuse and relay inspection
Wiring harness visual inspection

Recommended before extreme weather conditions

30,000 miles

24 months

Battery test and charge
ECU software update
Airbag system check
ABS system test

Requires specialized tools for some procedures

60,000 miles

48 months

Alternator replacement
Starter motor inspection
Wiring harness replacement if damaged
Fuse box cleaning

Critical for maintaining system reliability

Frequently Asked Questions

Find answers to common questions about torque specifications

What are the key technical specifications of the electrical system in a 2005-2011 BMW 335i?

The 2005-2011 BMW 335i features a 12-volt electrical system with an 80Ah battery capacity. It is compatible with the E90/E92/E93 chassis, utilizing a 170A alternator. Ensure all replacement parts meet these specifications for optimal performance.

What maintenance is required for the electrical system?

Maintenance includes checking the battery every 6 months, inspecting the charging system every 12,000 miles, and a comprehensive electrical inspection every 5 years or 60,000 miles. Use genuine BMW parts for reliability.

How do I install or replace an electrical component?

1. Disconnect the battery. 2. Access the component. 3. Remove the old part. 4. Install the new component. 5. Reconnect the battery. 6. Test the system. Always follow proper safety procedures.

How do I troubleshoot electrical issues?

Check the battery for charge and connections. Inspect fuses and relays. Use a multimeter to test circuits. Consult the repair manual or a professional if issues persist.

How can I optimize electrical system performance?

Upgrade to a high-performance battery, use correct gauge wiring, and avoid excessive aftermarket accessories. Regular checks ensure efficiency and reliability.

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 Electrical System Service Manual

Coming Soon

Detailed guide covering electrical diagnostics and repairs for 2005-2011 models.

Technical Bulletin: Electrical System Updates

Coming Soon

Addresses common issues and updates for the electrical system.

BMW Parts Catalog for Electrical Components

Coming Soon

Comprehensive list of genuine parts for electrical maintenance and repair.

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