Mercedes-Benz Mercedes A-Class 2012-2018 Electrical Specifications
Explore the detailed electrical specifications of the 2012-2018 Mercedes A-Class, including battery capacity, alternator output, wiring diagrams, and fuse box locations. This guide is essential for maintenance, troubleshooting, and upgrades.
Overview Specifications
This document provides a detailed overview of the electrical specifications for the 2012-2018 Mercedes-Benz A-Class. It is designed to assist users in understanding the vehicle's electrical systems, including battery, charging, lighting, and infotainment. Use the search functionality to locate specific terms or navigate through sections to find comprehensive details. Each section is organized to provide clear and concise information for quick reference.
How to Use
Use the search bar to enter keywords related to the electrical system you are researching. Results will highlight relevant sections and subsections for easy access.
Scroll through the document or use the table of contents to jump to specific sections. Each section is divided into subsections with detailed technical points for clarity.
Key Specifications
Battery Voltage
12V
Alternator Output
150A (standard)
Headlight Type
LED or Bi-xenon
Infotainment Display
5.8-inch or 7-inch
Bluetooth Version
4.0
Available Specifications
Battery and Charging System
This section covers the battery specifications, charging system, and related components for the 2012-2018 Mercedes-Benz A-Class. It includes details on battery capacity, alternator output, and maintenance tips.
Battery and Charging System
This section covers the battery specifications, charging system, and related components for the 2012-2018 Mercedes-Benz A-Class. It includes details on battery capacity, alternator output, and maintenance tips.
Battery Specifications
- 12V lead-acid battery standard across all models
- Battery capacity: 70Ah (varies by model and region)
- Cold cranking amps (CCA): 680A
- Maintenance-free design with integrated charge indicator
- Optional AGM (Absorbent Glass Mat) battery for higher performance
- Battery replacement interval: 4-6 years depending on usage
Charging System
- Alternator output: 150A (standard), 180A (optional)
- Voltage regulator integrated into alternator
- Smart charging system for optimized energy management
- Regenerative braking system to recharge battery during deceleration
- Charging time: 4-6 hours for full charge (using external charger)
Lighting System
This section provides details on the exterior and interior lighting systems, including headlights, taillights, and ambient lighting. It covers bulb types, wattage, and advanced lighting technologies.
Lighting System
This section provides details on the exterior and interior lighting systems, including headlights, taillights, and ambient lighting. It covers bulb types, wattage, and advanced lighting technologies.
Exterior Lighting
- LED daytime running lights standard on all models
- Bi-xenon headlights with adaptive lighting system (optional)
- LED taillights with dynamic turn signals
- Fog lights: 55W halogen or LED (depending on trim)
- Automatic headlight activation with rain sensor
- Headlight range adjustment: manual or automatic
Interior Lighting
- Ambient lighting with multiple color options (optional)
- LED map lights and reading lights
- Footwell lighting with adjustable brightness
- Trunk lighting: 5W LED
- Instrument cluster backlighting: LED
Infotainment and Connectivity
This section outlines the infotainment and connectivity features, including audio systems, navigation, and smartphone integration. It includes technical details on hardware and software specifications.
Infotainment and Connectivity
This section outlines the infotainment and connectivity features, including audio systems, navigation, and smartphone integration. It includes technical details on hardware and software specifications.
Audio System
- Standard 5.8-inch display with CD/MP3 player
- Optional 7-inch COMAND system with touchpad
- Harman Kardon premium sound system (optional)
- Bluetooth audio streaming and hands-free calling
- USB and AUX input ports
- DAB+ digital radio (region-specific)
Navigation and Connectivity
- GPS navigation with real-time traffic updates (optional)
- Apple CarPlay and Android Auto compatibility (2016 onwards)
- Wi-Fi hotspot capability (optional)
- Voice control system with natural language processing
- SD card slot for map updates
- Integrated Mercedes-Benz apps for vehicle monitoring
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Component Specifications
Overview
- Type
- 12V Electrical System
- Configuration
- Single Battery with Alternator
- Platform
- MFA (Modular Front Architecture)
- Material
- Copper Wiring with Aluminum Components
- Location
- Front Engine Compartment and Cabin
Dimensions
- Battery Length
- 10.2 in (260 mm)
- Battery Width
- 6.9 in (175 mm)
- Battery Height
- 7.5 in (190 mm)
- Alternator Diameter
- 5.9 in (150 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)
- Starter Motor Diameter
- 4.7 in (120 mm)
Materials
- Battery Case
- Polypropylene
- Wiring Harness
- Copper with PVC Insulation
- Alternator Housing
- Aluminum Alloy
- Fuse Box
- Thermoplastic
- Starter Motor
- Steel and Copper Windings
Features
- Lighting
-
- LED Daytime Running Lights
- Adaptive Highbeam Assist
- Automatic Headlight Control
- Ambient Interior Lighting
- infotainment
-
- COMAND Online System
- 7-inch Touchscreen Display
- Bluetooth Connectivity
- Voice Control
- Safety
-
- Electronic Stability Program (ESP)
- Tire Pressure Monitoring System
- Collision Prevention Assist
- Comfort
-
- Dual-Zone Automatic Climate Control
- Power Management
-
- Energy Recovery System
- Start-Stop Function
- Battery Monitoring System
Safety Features
- Circuit Protection
-
- Multiple Fuse Boxes
- Circuit Breakers
- Overload Protection
- Emergency Features
-
- Automatic Hazard Lights Activation
- Emergency Call System (eCall)
- Battery Safety
-
- Battery Isolation in Crash
- Overcharge Protection
Comfort Features
- Climate Control
-
- Heated Seats
- Heated Steering Wheel
- Air Conditioning with Pollen Filter
- Lighting
-
- Adjustable Interior Lighting
- Reading Lights
- Puddle Lights
- Convenience
-
- Keyless Go
- Power Windows with One-Touch Operation
- Power Folding Mirrors
Accessories
- Charging
-
- USB Ports
- 12V Power Outlet
- Wireless Charging Pad
- Audio
-
- Burmester Surround Sound System
- Headphone Jack
- SD Card Reader
- Navigation
-
- GPS Antenna
- Traffic Sign Recognition
- Speed Limit Assist
Maintenance
- Service interval
- Every 10,000 miles or 12 months
- Service Items
-
- Battery Health Check
- Alternator Output Test
- Wiring Harness Inspection
- Fuse Box Inspection
- Lighting System Check
- Maintenance Notes
- Use only Mercedes-approved replacement parts for electrical components.
Warranty
- Battery Warranty
- Miles: 36,000Years: 3Coverage: Defects and Capacity Loss
- Alternator Warranty
- Miles: 50,000Years: 4Coverage: Manufacturing Defects
- Wiring Warranty
- Miles: UnlimitedYears: 4Coverage: Corrosion and Breakage
- General Electrical Warranty
- Miles: 50,000Years: 4Coverage: Component Failure
Production Details
- Manufacturer
- Mercedes-Benz AG
- Manufacturing Process
-
- Automated Wiring Harness Assembly
- Precision Battery Testing
- Quality Control for Electrical Components
- Quality Control
- Testing: Voltage Stability Tests, Load Testing, Environmental Stress TestingCertifications: ISO 9001, ISO 14001
- Sustainability Practices
-
- Recyclable Battery Components
- Energy-Efficient Production
- Reduced Copper Usage
- Production Metrics
- Annual Output: 500,000 UnitsDefect Rate: 0.01%Energy Consumption: 15 kWh per Vehicle
Service Information for Electrical Service
Maintenance and service requirements specific to the electrical system
- Inspect battery terminals for corrosion
- Check alternator output voltage
- Test all exterior and interior lights
- Inspect wiring harness for wear or damage
- Verify fuse box integrity
Ensure all connections are secure and free of corrosion.
- Perform battery load test
- Check grounding points
- Inspect starter motor performance
- Test all electrical accessories
- Verify charging system functionality
Use diagnostic tools to ensure accurate readings.
- Replace battery if necessary
- Inspect and clean alternator components
- Check all wiring for insulation integrity
- Test all safety-related electrical systems
- Perform full system diagnostic
Battery replacement may be required depending on usage and climate conditions.
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 Are the electrical components of the 2012-2018 Mercedes A-Class compatible with other models?
Are the electrical components of the 2012-2018 Mercedes A-Class compatible with other models?
The electrical components of the 2012-2018 Mercedes A-Class are specifically designed for this model and may not be directly compatible with other Mercedes-Benz models or external brands. Compatibility depends on factors like voltage requirements, connector types, and software integration. Always consult the vehicle's technical manual or a certified technician to verify compatibility before attempting any modifications or replacements.
Q2 What are the maintenance requirements for the electrical system of the 2012-2018 Mercedes A-Class?
What are the maintenance requirements for the electrical system of the 2012-2018 Mercedes A-Class?
The electrical system of the 2012-2018 Mercedes A-Class requires regular inspections, including checking battery health, alternator performance, and wiring integrity. Replace the battery every 4-5 years and ensure software updates are applied as recommended by Mercedes-Benz. Inspect fuses and relays periodically and address any warning lights promptly to prevent potential electrical failures.
Q3 How do I replace the battery in the 2012-2018 Mercedes A-Class?
How do I replace the battery in the 2012-2018 Mercedes A-Class?
To replace the battery, first, ensure the vehicle is turned off and the key is removed. 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, secure it with the clamp, and reconnect the positive terminal first, then the negative. Reset the battery management system using a diagnostic tool to ensure proper functionality.
Q4 What should I do if the electrical system in my 2012-2018 Mercedes A-Class malfunctions?
What should I do if the electrical system in my 2012-2018 Mercedes A-Class malfunctions?
If the electrical system malfunctions, start by checking the battery voltage and connections. Inspect fuses and relays for any signs of damage. Use a diagnostic tool to scan for error codes and refer to the vehicle's manual for code interpretation. If the issue persists, consult a certified Mercedes-Benz technician to avoid further damage or safety risks.
Q5 How can I optimize the performance of the electrical system in my 2012-2018 Mercedes A-Class?
How can I optimize the performance of the electrical system in my 2012-2018 Mercedes A-Class?
To optimize performance, ensure the battery is fully charged and in good condition. Regularly update the vehicle's software to the latest version provided by Mercedes-Benz. Use genuine parts for replacements and avoid overloading the electrical system with aftermarket accessories. Periodically inspect wiring and connectors for wear or corrosion, and address any issues promptly.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
2012-2018 Mercedes A-Class Electrical System Service Manual
Coming SoonThis manual provides detailed instructions for maintaining and repairing the electrical system, including wiring diagrams and diagnostic procedures.
Mercedes-Benz Technical Service Bulletin: Electrical System Updates
Coming SoonThis bulletin outlines important updates and fixes for the electrical system, including software patches and component recalls.
Mercedes A-Class Electrical Parts Catalog
Coming SoonThis catalog lists all electrical components and accessories available for the 2012-2018 Mercedes A-Class, including part numbers and compatibility details.
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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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