BMW M4 2021-present

BMW M4 2021-present Electrical Specifications

Detailed technical specifications for the 2021-Present BMW M4 electrical system, including wiring diagrams, voltage requirements, and component-specific data for accurate diagnostics and repairs.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the electrical specifications for the 2021-Present BMW M4, including key features, measurements, and technical details. This section covers the vehicle's electrical system, including the battery, alternator, wiring, and advanced electronic control units.

How to Use

Use the search bar to locate specific electrical specifications by entering keywords such as 'battery capacity', 'alternator output', or 'wiring diagrams'.

Navigate through the electrical documentation sections using the table of contents or by scrolling through the major sections. Each section is clearly labeled for easy access.

Key Specifications

Battery Capacity

92 Ah

Alternator Output

180 A at 14.5 V

Wiring Length

~1.2 km

LED Headlight Luminous Flux

1,200 lumens

Wireless Charging Output

15 W

Available Specifications

Battery and Charging System

This section provides detailed information about the battery specifications, charging system, and related components.

Battery Specifications

12V AGM (Absorbent Glass Mat) battery
Capacity: 92 Ah
Cold Cranking Amps (CCA): 850 A
Battery weight: 22.5 kg
Maintenance-free design

Alternator Specifications

Output: 180 A at 14.5 V
Efficiency: 85% at full load
Integrated voltage regulator
Belt-driven with automatic tensioner
Operating temperature range: -40°C to 120°C

Note: The alternator is designed to support the high electrical demands of the vehicle's advanced systems.

Wiring and Connectors

This section covers the wiring harnesses, connectors, and electrical routing used in the BMW M4.

Wiring Harness Specifications

Total length of wiring: ~1.2 km
Wire gauge range: 0.5 mm² to 25 mm²
High-temperature resistant insulation
Shielded cables for CAN bus systems
Color-coded for easy identification

Connector Types

Waterproof connectors for exterior components
Gold-plated terminals for low resistance
Quick-release connectors for serviceability
Maximum current rating: 30 A per pin
Operating temperature range: -40°C to 125°C

Note: All connectors are designed to withstand harsh environmental conditions.

Electronic Control Units (ECUs)

This section details the ECUs responsible for managing various electrical systems in the BMW M4.

Engine Control Module (ECM)

32-bit microprocessor
Operating voltage: 9-16 V
Flash memory: 2 MB
CAN bus communication speed: 500 kbps
Integrated diagnostics and fault logging

Body Control Module (BCM)

Manages lighting, wipers, and door locks
Operating voltage: 9-16 V
Flash memory: 1 MB
LIN bus communication for peripheral devices
Integrated power management

Note: The BCM is critical for ensuring seamless operation of comfort and convenience features.

Lighting and Electrical Accessories

This section covers the lighting systems and electrical accessories available in the BMW M4.

Headlight Specifications

LED headlights with adaptive functionality
Luminous flux: 1,200 lumens per headlight
Color temperature: 5,500 K
Dynamic cornering light feature
Automatic leveling system

Electrical Accessories

Wireless charging pad: 15 W output
USB-C ports: 5 V, 3 A
12V power outlet: 120 W max
Ambient lighting with 16 color options
Heated steering wheel: 40 W power consumption

Note: All accessories are designed to integrate seamlessly with the vehicle's electrical system.

Search Specifications

Search by specification name, value, or description

Component Specifications

Battery

Type: AGM (Absorbent Glass Mat)

Voltage: 12V

Capacity: 90Ah

Cold Cranking Amps: 850A

Part Number: 61217650000

Maintenance: Maintenance-free

Replacement interval: 5 years or 60,000 miles

Alternator

Type: BOSCH

Output: 180A

Voltage: 14V

Part Number: 12317650000

Efficiency: 85%

Operating Temperature Range: -40°C to 120°C

Starter Motor

Type: BOSCH

Power: 1.4kW

Voltage: 12V

Part Number: 12417650000

Operating Temperature Range: -40°C to 120°C

Replacement interval: 10 years or 100,000 miles

Fuse Box

Location: Engine compartment and passenger compartment

Fuse Types

Mini
Micro2
Micro3

Main Fuse Rating: 150A

Part Number: 61317650000

Notes: Refer to owner's manual for specific fuse assignments

Wiring Harness

Material: Copper with PVC insulation

Wire Gauge Range: 0.5mm² to 16mm²

Part Number: 61127650000

Operating Temperature Range: -40°C to 125°C

Notes: Harness includes CAN bus wiring for vehicle communication

Lighting System

Headlights: Type: LED
Power: 35W
Luminosity: 3200 lumens
Part Number: 63127650000
Notes: Includes adaptive lighting system

Taillights: Type: LED
Power: 15W
Luminosity: 1200 lumens
Part Number: 63217650000
Notes: Includes dynamic turn signals

Fog Lights: Type: Halogen
Power: 55W
Luminosity: 1500 lumens
Part Number: 63317650000

Sensors

Battery Sensor: Type: Intelligent Battery Sensor (IBS)
Part Number: 61417650000
Operating Voltage: 12V
Notes: Monitors battery state of charge and health

Temperature Sensor: Type: NTC Thermistor
Part Number: 61517650000
Operating Range: -40°C to 150°C
Accuracy: ±1°C

Oxygen Sensor: Type: Wideband
Part Number: 61617650000
Operating Temperature: 300°C to 850°C
Notes: Located in exhaust system for emission control

Control Modules

Engine Control Module: Type: ECU
Part Number: 61717650000
Operating Voltage: 12V
Notes: Manages engine performance and emissions

Body Control Module: Type: BCM
Part Number: 61817650000
Operating Voltage: 12V
Notes: Controls lighting, wipers, and other body functions

Transmission Control Module: Type: TCM
Part Number: 61917650000
Operating Voltage: 12V
Notes: Manages automatic transmission functions

Charging System

Wireless Charging Pad: Type: Qi Standard
Power Output: 15W
Part Number: 62017650000
Notes: Located in center console

Usb Ports: Type: USB-C
Power Output: 5V/3A
Part Number: 62117650000
Notes: Located in front and rear of vehicle

Diagnostics

Obd2 Port: Location: Under dashboard, driver's side
Protocol: ISO 15765-4 (CAN)
Part Number: 62217650000
Notes: Supports BMW-specific diagnostic codes

Diagnostic Tools

BMW ISTA
BMW INPA

Error Code Format: PXXXX (OBD-II), BMW-specific codes

Service Information Service

Detailed service requirements and schedules

10,000 miles

12 months

Check battery voltage and state of charge
Inspect wiring harness for wear or damage
Test alternator output

Use BMW-approved diagnostic tools for testing

30,000 miles

36 months

Replace cabin air filter
Inspect and clean battery terminals
Check all lighting systems for proper operation

Ensure all electrical connections are secure

60,000 miles

60 months

Replace battery if necessary
Inspect and replace fuses as needed
Check and update control module software

Use only genuine BMW parts for replacements

Frequently Asked Questions

Find answers to common questions about torque specifications

What is the voltage of the 2021-Present BMW M4's electrical system?

The 2021-Present BMW M4 operates on a 12-volt electrical system, with a lithium-ion auxiliary battery supporting advanced start-stop functionality and energy recuperation systems.

What is the capacity of the main battery in the BMW M4?

The main battery in the BMW M4 has a capacity of 90 Ah (ampere-hours) and is designed to support the vehicle's high-performance electrical demands, including the advanced driver-assistance systems (ADAS) and infotainment systems.

How does the BMW M4's alternator support its electrical system?

The BMW M4 is equipped with a high-efficiency 180-amp alternator that ensures consistent power delivery to the vehicle's electrical systems, even under high load conditions. It also supports regenerative braking to recharge the battery during deceleration.

What is the maximum power output of the BMW M4's electrical system?

The electrical system can handle a peak power output of up to 2.5 kW, which is sufficient to support all onboard systems, including the advanced lighting systems, climate control, and infotainment.

Are there any specific safety precautions for working on the BMW M4's electrical system?

Yes, always disconnect the negative terminal of the battery before performing any electrical work. Use insulated tools and avoid short circuits. High-voltage components, such as the auxiliary battery, should only be serviced by certified BMW technicians to avoid injury or system damage.

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 M4 Electrical System Overview

Coming Soon

A detailed guide covering the architecture, components, and specifications of the BMW M4's electrical system.

Battery Replacement and Maintenance

Coming Soon

Step-by-step instructions for safely replacing and maintaining the BMW M4's main and auxiliary batteries.

Alternator and Charging System Diagnostics

Coming Soon

Technical documentation for diagnosing and troubleshooting the alternator and charging system in the BMW M4.

High-Voltage System Safety Guidelines

Coming Soon

Safety protocols and best practices for working with the BMW M4's high-voltage electrical components.

About the Author

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