Audi Audi S4 2009-2016

Audi Audi S4 2009-2016 Electrical Specifications

Find detailed electrical specifications for the 2009-2016 Audi S4, including battery, alternator, wiring, and fuse box information. Perfect for maintenance, repairs, and upgrades.

Updated Feb 10, 2025

Electrical Specifications Overview Specifications

This document provides a comprehensive overview of the electrical specifications for the 2009-2016 Audi S4. It includes detailed information about the battery, charging system, wiring, and electrical accessories. Use this guide to understand the technical aspects of the vehicle's electrical system, troubleshoot issues, and ensure proper maintenance. Navigate through the sections to find specific details or use the search functionality to locate particular components or specifications.

How to Use

To search for specific information, use the search bar at the top of the document. Type in keywords such as 'battery', 'alternator', or 'wiring' to find relevant sections quickly.

Use the table of contents or section headers to navigate through the document. Each major section is divided into subsections for easier access to detailed information.

Key Specifications

▲

Battery Capacity

80 Ah

■

Alternator Output

140A

●

System Voltage

12V

◆

Main Fuse Box Location

Engine compartment (driver's side)

★

Communication Protocol

CAN bus

Available Specifications

Battery and Charging System

This section details the specifications and requirements for the battery and charging system in the 2009-2016 Audi S4. It includes information about battery capacity, charging rates, and maintenance tips.

Battery Specifications

Battery type: Lead-acid (maintenance-free)
Capacity: 80 Ah (ampere-hours)
Cold cranking amps (CCA): 800 CCA
Voltage: 12V
Recommended replacement interval: 5-7 years or as needed

Charging System Details

Alternator type: Bosch 140A alternator
Voltage regulator: Integrated in the alternator
Charging voltage: 14.4V ± 0.5V
Charging current: Up to 90A

Electrical Power Distribution

This section covers the electrical power distribution system, including fuses, relays, and circuit protection. It provides details on the location and function of key components.

Fuse Box Locations

Main fuse box: Located in the engine compartment (driver's side)
Interior fuse box: Located behind the glovebox
Rear fuse box: Located in the luggage compartment (driver's side)
Total fuses: 50+ (varies by model year)

Relay Module Details

Main relay module: Located in the engine compartment
Secondary relay modules: Distributed throughout the vehicle
Common relays: Fog lights, cooling fan, ABS, and more

Wiring and Connectors

This section provides information about the wiring harness, connectors, and communication protocols used in the 2009-2016 Audi S4. It includes tips for diagnosing wiring issues.

Wiring Harness Specifications

Wiring harness material: High-temperature resistant PVC
Main harness length: Approximately 100 meters
Color coding: Follows industry standards
Connectors: Weather-sealed for durability

Communication Protocols

CAN bus (Controller Area Network) protocol
LIN bus (Local Interconnect Network) for simpler components
Diagnostic port: OBD-II (On-Board Diagnostics II)
Communication speed: Up to 500 kbps

Electrical Accessories and Components

This section details the specifications and functionality of electrical accessories such as lights, wipers, and electronic controls. It also covers optional features.

Lighting System

Headlight type: Bi-xenon (standard) or LED (optional)
Tail light type: LED
Turn signal type: LED
Fog light type: Halogen (standard) or LED (optional)

Optional Electrical Features

Adaptive cruise control
Lane departure warning system
Parking sensors
Premium sound system with 14 speakers

Search Specifications

Search by specification name, value, or description

Component Specifications

Overview

Type: 12V electrical system

Configuration: MLB platform architecture

Voltage: 12V DC

Battery Capacity: 90Ah

Alternator Capacity: 150A

Location: Battery located in trunk compartment

Dimensions

Battery Length: 315 mm

Battery Width: 175 mm

Battery Height: 190 mm

Alternator Length: 300 mm

Alternator Width: 200 mm

Alternator Height: 150 mm

Total Wiring Harness Length: 100 meters

Fuse Box Dimensions: 250x150x80 mm

Main Ecu Dimensions: 200x150x50 mm

Main Power Cable Cross Section: 10 mm2

Charging System Cable Cross Section: 25 mm2

Materials

Wiring Harness: Copper core with PVC insulation

Battery Terminals: Brass with nickel plating

Electrical Connectors: Nickel-plated copper

Fuse Box Material: ABS plastic with stainless steel contacts

Main Ecu Casing: Aluminum alloy with epoxy coating

Alternator Housing: Durable plastic with internal fan

Features

Electrical Features

Adaptive cruise control system integration
Rain sensor for automatic windshield wipers
Automatic headlight control with dusk sensor
Power steering control module
Electronic stability control system

Power Features

Heated seats (front and rear)
Heated steering wheel
Power windows with anti-pinch
Power door locks
Remote keyless entry

infotainment Features

Audi MMI infotainment system
Bluetooth hands-free phone integration
14-speaker Bang & Olufsen sound system
USB and auxiliary input ports
Navigation system with 7-inch display

Driver Assistance Features

Audi lane assist
Park distance control
Rearview camera
Adaptive speed limit control
Traffic sign recognition

Comfort Features

Dual-zone automatic climate control
Keyless entry and start
Ambient interior lighting
Power-adjustable and ventilated front seats
Memory function for driver seat and mirrors

Lighting Features

LED daytime running lights
Adaptive xenon headlights
LED taillights
Interior LED lighting package
Automatic headlights with coming home function

Safety Features

Airbags

Dual front airbags
Side airbags
Curtain airbags
Knee airbags

Anti-Theft Systems

Immobilizer system
Anti-tow alarm
Interior ultrasonic sensors

Emergency Systems

Automatic crash unlock
Fuel cutoff in case of collision
Emergency call system (SOS)
Battery disconnect in case of airbag deployment

Comfort Features

interior Lighting

Illuminated door sills
Footwell lighting
Cupholder lighting
Ambient LED lighting in doors and dashboard

Seating Features

18-way power adjustable front seats
Heated front and rear seats
Ventilated front seats
Massage function for front seats

Climate Control

Dual-zone automatic climate control
Rear seat climate control
Air quality sensor
Pollutant-neutralizing filter

Convenience Features

Power tailgate
Remote start system
Heated windshield washer nozzles
Auto-dimming mirrors

Accessories

installation Accessories

Wiring harness connectors
Battery terminals
Fuses and relays
Electrical tape and heat shrink tubing

Testing Equipment

Multimeter
Circuit tester
Battery tester
OBD-II scanner

Replacement Parts

Fuses
Relays
Wiring harness components
Battery

Maintenance

Service interval: Every 15,000 miles or 12 months

Service Items

Battery health check
Wiring harness inspection
Fuse and relay inspection
ECU software update
Electrical connector cleaning

Maintenance Notes: Regular inspection of electrical components is crucial to prevent faults. Use only OEM or equivalent parts for replacements.

Warranty

Basic Warranty: Coverage: Bumper-to-bumper
Term: 4 years
Miles: 50,000 miles
Details: Includes all electrical components

Powertrain Warranty: Coverage: Powertrain
Term: 4 years
Miles: 50,000 miles
Details: Covers engine, transmission, and electrical systems

Battery Warranty: Coverage: Battery
Term: 3 years
Miles: 36,000 miles
Details: Free replacement if faulty

Corrosion Warranty: Coverage: Corrosion perforation
Term: 12 years
Miles: Unlimited miles
Details: Covers body and electrical component corrosion

Production Details

Manufacturer: Audi AG

Manufacturing Process

Robotic assembly lines
Automated soldering and crimping
High-voltage testing
End-of-line functional testing

Quality Control: inspection: Visual and functional testing of all components
Certification: ISO 9001:2015 certified
Standards: Meets or exceeds DIN and SAE standards

Sustainability Practices

Recycling of electrical components
Use of lead-free solders
Energy-efficient manufacturing processes
Compliance with RoHS directive

Production Metrics: Units Per Month: 500 units/month
Failure Rate: <1%
Warranty Claim Rate: <2%
Supplier Quality Rating: 98%

Service Information for Electrical System Service

Recommended maintenance schedule for electrical components

15,000 miles

12 months

Inspect battery terminals and connections
Check wiring harness for signs of wear
Test alternator charging voltage
Inspect fuses and relays
Update ECU software if available

Perform visual inspection of all electrical components. Replace any worn or damaged parts.

30,000 miles

24 months

Replace air filter for battery compartment
Clean electrical connectors
Inspect power steering system
Test ABS and ESP systems
Check adaptive cruise control sensors

Use specialized tools for connector cleaning. Ensure all systems are functioning correctly.

60,000 miles

48 months

Replace battery if capacity is below 75%
Inspect and replace serpentine belt if necessary
Test starter motor and alternator performance
Inspect entire wiring harness
Perform comprehensive ECU diagnostic check

Major service interval. Perform thorough inspection and testing of all electrical systems.

Frequently Asked Questions

Find answers to common questions about torque specifications

What is the electrical system specification of the 2009-2016 Audi S4?

The 2009-2016 Audi S4 features a 12-volt electrical system with a maintenance-free battery. It includes advanced components such as an Electronic Control Module (ECM), CAN bus communication, and compatibility with diagnostic tools like VCDS for system monitoring and troubleshooting.

What are the recommended maintenance requirements for the electrical system?

Regular maintenance includes battery checks every 6 months, wiring harness inspections annually, and software updates as needed. Consult the service manual for specific intervals and procedures to ensure optimal performance.

How do I replace a faulty electrical component?

To replace a component, disconnect the battery, use genuine Audi parts, and follow torque specifications. Reconnect the battery and test the system. If unsure, consult the service manual or a professional.

How do I troubleshoot common electrical issues?

Check for a dead battery, blown fuses, or faulty sensors. Use a multimeter to test connections and consult the manual for diagnostic trouble codes (DTCs) to identify issues accurately.

How can I optimize the electrical system's performance?

Consider high-performance batteries, capacitors, and ensuring all connections are tight. Upgrading to a high-capacity alternator may improve system 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.

Audi S4 B8 Service Manual

Coming Soon

Comprehensive guide covering electrical system diagnostics and repair procedures.

Audi Technical Service Bulletin - Electrical System Updates

Coming Soon

Details known issues and solutions for the electrical system.

Audi Parts Catalog - Electrical Components

Coming Soon

Catalog of genuine parts for the Audi S4 electrical system.

About the Author

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