Mercedes-Benz Mercedes B-Class 2005-2011 Electrical Specifications
Explore the detailed electrical specifications for the 2005-2011 Mercedes B-Class, including battery, alternator, starter motor, and wiring details. Essential for maintenance, troubleshooting, and upgrades.
Overview Specifications
This document provides detailed electrical specifications for the 2005-2011 Mercedes B-Class. It covers key components such as the battery, alternator, lighting, and other electrical systems. Use this guide to understand the technical aspects of the vehicle's electrical setup, troubleshoot issues, or perform maintenance. The sections are organized for easy navigation, and the quick reference table summarizes the most important specifications.
How to Use
Use the search function to find specific keywords or phrases related to electrical components. Enter terms like 'battery', 'alternator', or 'fuse' to quickly locate relevant information.
Navigate through the document by scrolling or clicking on section titles. Each section is divided into subsections with detailed information about specific electrical components.
Key Specifications
Battery Capacity
70 Ah
Alternator Output
150 A
Headlight Wattage
55 W
Main Fuse Box Location
Under dashboard
Charging Voltage
13.8-14.4 V
Available Specifications
Battery System
This section covers the battery specifications, including type, capacity, and maintenance tips for the 2005-2011 Mercedes B-Class. It also includes details on charging and troubleshooting common battery issues.
Battery System
This section covers the battery specifications, including type, capacity, and maintenance tips for the 2005-2011 Mercedes B-Class. It also includes details on charging and troubleshooting common battery issues.
Battery Specifications
- Type: Maintenance-free lead-acid battery
- Capacity: 70 Ah
- Voltage: 12 V
- CCA (Cold Cranking Amps): 640 A
- Replacement interval: Every 4-5 years
Charging System
- Alternator output: 150 A
- Voltage regulator: Integrated
- Charging time: 6-8 hours for full charge
- Charging voltage: 13.8-14.4 V
Lighting System
This section provides details on the exterior and interior lighting systems, including bulb types, wattage, and replacement procedures for the Mercedes B-Class.
Lighting System
This section provides details on the exterior and interior lighting systems, including bulb types, wattage, and replacement procedures for the Mercedes B-Class.
Exterior Lighting
- Headlights: Halogen, 55 W
- Fog lights: H8, 35 W
- Brake lights: P21/5 W
- Turn signals: PY21 W
Interior Lighting
- Dome light: Festoon, 10 W
- Reading lights: W5W, 5 W
- Dashboard illumination: LED, 1.2 W
Fuse and Relay System
This section explains the fuse and relay layout, including their locations, functions, and replacement guidelines for the Mercedes B-Class.
Fuse and Relay System
This section explains the fuse and relay layout, including their locations, functions, and replacement guidelines for the Mercedes B-Class.
Fuse Box Locations
- Main fuse box: Under the dashboard
- Secondary fuse box: In the engine compartment
- Rear fuse box: Near the rear seats
Common Fuse Ratings
- Headlights: 15 A
- Power windows: 20 A
- Radio: 10 A
- AC system: 25 A
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Component Specifications
Overview
- Type
- 12V DC system
- Configuration
- Single battery, alternator-driven
- Platform
- W245 (2005-2011)
- Material
- Copper wiring, ABS plastic housings
- Location
- Front engine compartment and distributed throughout vehicle
Dimensions
- Battery Length
- 10.2 in (260 mm)
- Battery Width
- 6.9 in (175 mm)
- Battery Height
- 7.5 in (190 mm)
- Alternator Diameter
- 5.1 in (130 mm)
- Alternator Length
- 7.9 in (200 mm)
- Wiring Harness Length
- 98.4 ft (30 m)
- Fuse Box Dimensions
- 6.3 x 4.7 x 2.0 in (160 x 120 x 50 mm)
Materials
- Wiring
- Copper with PVC insulation
- Battery Case
- ABS plastic
- Alternator Housing
- Aluminum alloy
- Fuse Box
- Thermoplastic
- Connectors
- Nylon with gold-plated contacts
Features
- Lighting System
-
- Bi-xenon headlights
- LED daytime running lights
- Automatic headlight leveling
- Rain-sensing wipers with light sensor
- Power Distribution
-
- Central fuse box with 40 fuses
- Intelligent alternator control
- Battery monitoring system
- Power distribution module
- Sensors
-
- Rain/light sensor
- Tire pressure monitoring system
- Parking sensors
- Ambient light sensor
- infotainment
-
- Audio 20 CD system
- Bluetooth connectivity
- Steering wheel controls
- AUX input
- Climate Control
-
- Automatic climate control
- Rear window defogger
- Heated mirrors
- Air quality sensor
Safety Features
- Lighting
-
- Emergency brake light flashing
- Adaptive brake lights
- Power Management
-
- Battery saver mode
- Load shedding during start
- Crash Safety
-
- Automatic fuel pump cutoff
- Emergency call system activation
Comfort Features
- Lighting
-
- Ambient interior lighting
- Puddle lights
- Automatic headlights
- Power
-
- 12V power outlets
- Heated seats
- Power windows with one-touch operation
- Convenience
-
- Keyless entry
- Automatic door locking
- Power folding mirrors
Accessories
- Exterior
-
- LED light upgrades
- Chrome exhaust tips
- Roof rack with LED lighting
- interior
-
- Ambient lighting kits
- Wireless charging pad
- USB adapters
- Performance
-
- High-output alternator
- Upgraded battery
- Performance wiring harness
Maintenance
- Service interval
- Every 20,000 miles or 24 months
- Service Items
-
- Battery inspection and cleaning
- Alternator belt tension check
- Fuse inspection
- Ground connection check
- Lighting system diagnostic
- Notes
- Use only Mercedes-approved electrical components for replacements
Warranty
- Battery Warranty
- Miles: 36,000Years: 2Coverage: Replacement for manufacturing defects
- Alternator Warranty
- Miles: 50,000Years: 4Coverage: Repair or replacement
- Wiring Warranty
- Miles: 100,000Years: 10Coverage: Corrosion and insulation defects
- Electronics Warranty
- Miles: 50,000Years: 4Coverage: Control modules and sensors
Production Details
- Manufacturer
- Mercedes-Benz AG
- Manufacturing Process
-
- Automated wiring harness assembly
- Robotic component installation
- Laser welding for connections
- Quality Control
- Testing: High-voltage insulation testing, Vibration resistance testing, Temperature cycling testsCertifications: ISO 9001, ISO 14001, ISO 26262 for automotive safety
- Sustainability
-
- Lead-free soldering
- Recyclable wiring materials
- Energy-efficient production processes
- Production Metrics
- Daily Output: 1200 unitsDefect Rate: 0.02%Energy Consumption: 15 kWh per vehicle
Service Information for electrical Service
Maintenance and service requirements specific to the electrical system
- Battery health check
- Alternator output test
- Ground connection inspection
- Fuse integrity check
- Lighting system diagnostic
Use Mercedes STAR diagnostic system for accurate readings
- Battery terminal cleaning
- Alternator belt replacement
- Wiring harness inspection
- Sensor calibration check
- Power distribution module test
Replace battery if capacity drops below 60%
- Complete wiring harness inspection
- Alternator overhaul or replacement
- Battery replacement
- Ground strap replacement
- Fuse box cleaning and inspection
Consider upgrading to high-capacity components for improved performance
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What are the electrical system specifications for the 2005-2011 Mercedes B-Class?
What are the electrical system specifications for the 2005-2011 Mercedes B-Class?
The 2005-2011 Mercedes B-Class features a 12-volt electrical system with a 70-90 Ah battery, depending on the model. It includes advanced systems like CAN-Bus for communication between control units, ABS, ESP, and SRS. The alternator output ranges from 120-150 amps. Compatibility is ensured with OEM parts, but aftermarket components must meet Mercedes-Benz specifications to avoid malfunctions.
Q2 What are the maintenance requirements for the electrical system in the Mercedes B-Class?
What are the maintenance requirements for the electrical system in the Mercedes B-Class?
Regular maintenance includes checking the battery every 6 months for corrosion and charge levels, inspecting alternator belts for wear, and ensuring all electrical connections are secure. Fuses and relays should be tested annually. Software updates for control units may be required through a Mercedes-Benz dealership. Always refer to the owner’s manual for specific intervals and procedures.
Q3 How do I replace the battery in a 2005-2011 Mercedes B-Class?
How do I replace the battery in a 2005-2011 Mercedes B-Class?
To replace the battery, first, disconnect the negative terminal followed by the positive terminal. Remove the battery hold-down clamp and carefully lift the battery out. Install the new battery, ensuring it is securely clamped. Reconnect the positive terminal first, then the negative terminal. Reset the vehicle’s electrical system if necessary, using a diagnostic tool or by following the owner’s manual instructions.
Q4 What should I do if the electrical system in my Mercedes B-Class malfunctions?
What should I do if the electrical system in my Mercedes B-Class malfunctions?
Start by checking the battery terminals for corrosion and ensuring the connections are tight. Test the battery voltage; it should read 12.6V when the engine is off and 13.7-14.7V when running. Inspect fuses and relays for damage. If issues persist, use a diagnostic scanner to read fault codes from the control units. Seek professional assistance for complex problems.
Q5 How can I optimize the performance of the electrical system in my Mercedes B-Class?
How can I optimize the performance of the electrical system in my Mercedes B-Class?
Ensure the battery is fully charged and in good condition. Use high-quality alternators and batteries that meet OEM specifications. Minimize unnecessary electrical load by turning off unused accessories. Regularly update the vehicle’s software through a Mercedes-Benz dealer. Keep the wiring harness and connectors clean and free from corrosion to maintain optimal electrical performance.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
Mercedes B-Class Electrical System Service Manual
Coming SoonThis manual provides detailed wiring diagrams, component locations, and repair procedures for the electrical system of the 2005-2011 Mercedes B-Class.
Technical Service Bulletin for Electrical System Updates
Coming SoonThis bulletin outlines software updates and common electrical issues for the 2005-2011 Mercedes B-Class, including recommended fixes.
Mercedes B-Class Parts and Accessories Catalog
Coming SoonThis catalog lists genuine and compatible parts for the electrical system of the 2005-2011 Mercedes B-Class, including batteries, alternators, and wiring harnesses.
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