BMW 850i 2018-present

BMW 850i 2018-present Electrical Specifications

Detailed technical specifications for the electrical system of the 2018-Present BMW 850i, including wiring diagrams, fuse box layouts, battery and alternator details, and advanced driver-assistance systems (ADAS) integration.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the electrical specifications for the 2018-Present BMW 850I, including key features, measurements, and technical details

How to Use

Use the search function to locate specific electrical specifications by entering keywords such as 'battery voltage', 'alternator output', or 'fuse ratings'.

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

Key Specifications

Battery Voltage

12.6V - 14.8V

Alternator Output

180 A at 6000 RPM

LED Headlight Power

15W

Main Fuse Rating

150A

Wire Gauge Range

0.5 mm² to 16 mm²

Available Specifications

Battery and Charging System

Detailed information on the battery specifications, charging system, and related components

Battery Specifications

12V AGM (Absorbent Glass Mat) battery
Capacity: 90 Ah
Cold Cranking Amps (CCA): 850 A
Battery voltage range: 12.6V - 14.8V

Alternator Specifications

Output: 180 A at 6000 RPM
Voltage regulation: 13.5V - 14.8V
Efficiency: 85% at full load
Integrated voltage regulator

Note: Ensure the alternator belt tension is within 500-700 N for optimal performance.

Lighting System

Technical details of the exterior and interior lighting systems, including LED and adaptive lighting features

Exterior Lighting

LED headlights with adaptive cornering function
High beam range: up to 500 meters
Daytime Running Lights (DRL) power consumption: 15W
Automatic headlight leveling system

Interior Lighting

Ambient lighting with 11 color options
LED dome light power: 5W
Reading light intensity: 300 lumens
Automatic dimming function for rearview mirror

Fuse and Relay System

Information on the fuse box locations, fuse ratings, and relay configurations

Fuse Box Locations

Primary fuse box located in the glove compartment
Secondary fuse box under the hood near the battery
Tertiary fuse box in the trunk
Total fuse count: 42

Fuse Ratings

Main fuse rating: 150A
Headlight fuse: 20A
Accessory fuse: 10A
ECU fuse: 7.5A

Note: Always replace fuses with the same rating to avoid electrical damage.

Wiring and Connectors

Details on the wiring harness, connectors, and grounding points

Wiring Harness

Total wire length: ~1200 meters
Wire gauge range: 0.5 mm² to 16 mm²
Insulation material: Cross-linked polyethylene (XLPE)
Shielded cables for CAN bus communication

Connectors

Waterproof connectors for exterior components
Gold-plated terminals for low resistance
Maximum current rating: 30A per pin
Total connector count: 56

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: 61219100001

Maintenance: Maintenance-free

Replacement interval: 5 years or 60,000 miles

Safety Notes: Disconnect negative terminal first during replacement

Alternator

Type: BOSCH

Output: 180A

Voltage: 14V

Part Number: 12317848000

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

Efficiency: 85%

Replacement interval: 10 years or 120,000 miles

Starter Motor

Type: BOSCH

Power: 2.2kW

Voltage: 12V

Part Number: 12417700001

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

Replacement interval: 10 years or 120,000 miles

Fuse Box

Location: Passenger side dashboard

Fuse Types

Mini
Micro2
Micro3

Fuse Ratings

5A
7.5A
10A
15A
20A
25A
30A

Part Number: 61319200001

Maintenance: Check fuses every 12 months or 15,000 miles

Wiring Harness

Material: Copper with PVC insulation

Wire Gauge

18 AWG
20 AWG
22 AWG

Length: Approximately 1500 meters

Part Number: 61129200001

Operational Temperature Range: -40°C to 105°C

Maintenance: Inspect for wear and tear every 24 months

Lighting System

Headlights: Type: LED
Power: 35W
Luminosity: 3200 lumens
Part Number: 63129200001
Replacement interval: 5 years or 60,000 miles

Taillights: Type: LED
Power: 15W
Luminosity: 1200 lumens
Part Number: 63219200001
Replacement interval: 5 years or 60,000 miles

Fog Lights: Type: Halogen
Power: 55W
Luminosity: 1500 lumens
Part Number: 63319200001
Replacement interval: 3 years or 36,000 miles

Sensors

Oxygen Sensor: Type: Zirconia
Voltage: 0.1V to 0.9V
Operational Temperature Range: -40°C to 800°C
Part Number: 11787500001
Replacement interval: 100,000 miles

Crankshaft Position Sensor: Type: Magnetic
Voltage: 5V
Operational Temperature Range: -40°C to 150°C
Part Number: 12147500001
Replacement interval: 100,000 miles

Camshaft Position Sensor: Type: Hall Effect
Voltage: 5V
Operational Temperature Range: -40°C to 150°C
Part Number: 12147500002
Replacement interval: 100,000 miles

Control Modules

Engine Control Module: Type: Bosch MEVD17.2
Voltage: 12V
Operational Temperature Range: -40°C to 85°C
Part Number: 12347500001
Replacement interval: Lifetime (unless damaged)

Transmission Control Module: Type: ZF 8HP
Voltage: 12V
Operational Temperature Range: -40°C to 85°C
Part Number: 12447500001
Replacement interval: Lifetime (unless damaged)

Body Control Module: Type: Bosch
Voltage: 12V
Operational Temperature Range: -40°C to 85°C
Part Number: 12547500001
Replacement interval: Lifetime (unless damaged)

Charging System

Wireless Charging Pad: Type: Qi Standard
Power Output: 15W
Compatibility: Qi-enabled devices
Part Number: 61319200002
Operational Temperature Range: 0°C to 40°C

Usb Ports: Type: USB-C
Power Output: 5V/3A
Compatibility: USB-C devices
Part Number: 61319200003
Operational Temperature Range: 0°C to 40°C

Diagnostic System

Obd2 Port: Type: OBD-II
Location: Driver side dashboard
Protocols: CAN, ISO 15765-4
Part Number: 61319200004
Diagnostic Capabilities: Read/clear codes, Live data, Component testing

Diagnostic Software: Type: BMW ISTA
Version: 4.30.20
Compatibility: Windows 10, Windows 11
Part Number: 61319200005
Diagnostic Capabilities: Full system diagnostics, Programming, Coding

Service Information Service

Detailed service requirements and schedules

15,000

Inspect battery and charging system
Check all fuses and relays
Inspect wiring harness for wear and tear

Ensure all electrical connections are secure and free of corrosion

30,000

Test alternator output
Inspect starter motor
Check all lighting systems

Replace any faulty components immediately

60,000

Replace battery if necessary
Inspect and clean all sensors
Update control module software

Use only BMW-approved parts and software

Frequently Asked Questions

Find answers to common questions about torque specifications

What is the voltage of the battery system in the 2018-Present BMW 850i?

The 2018-Present BMW 850i is equipped with a 12-volt electrical system. The battery is a 12V AGM (Absorbent Glass Mat) type, with a capacity of 90 Ah and a cold cranking amperage (CCA) of 850 A, ensuring reliable performance in various conditions.

What is the alternator output for the BMW 850i?

The alternator in the BMW 850i has an output of 180 amps at 14 volts. This ensures sufficient power supply to the vehicle's electrical systems, including advanced features like the iDrive infotainment system and adaptive lighting.

How does the BMW 850i handle electrical load management?

The BMW 850i uses an Intelligent Battery Sensor (IBS) and a Power Management System (PMS) to monitor and manage electrical loads. The system prioritizes essential functions during low battery conditions and can deactivate non-essential systems to conserve power.

What type of fuses are used in the BMW 850i electrical system?

The BMW 850i uses blade-type fuses with ratings ranging from 5A to 40A, depending on the circuit. The fuse box is located in the glove compartment and under the hood, with detailed labeling for easy identification and replacement.

Can the BMW 850i support aftermarket electrical accessories?

While the BMW 850i can support aftermarket accessories, it is recommended to use BMW-approved components to avoid overloading the electrical system. Improper installation or incompatible accessories may void the vehicle's warranty and cause system malfunctions.

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 850i Electrical System Overview

Coming Soon

A detailed guide covering the electrical system architecture, components, and specifications for the 2018-Present BMW 850i.

Battery Replacement Procedure

Coming Soon

Step-by-step instructions for safely replacing the AGM battery in the BMW 850i, including registration and coding requirements.

Alternator Diagnostics and Repair

Coming Soon

Technical documentation for diagnosing and repairing the alternator in the BMW 850i, including voltage output testing and replacement guidelines.

Fuse Box Layout and Diagrams

Coming Soon

Comprehensive diagrams and descriptions of the fuse box locations and fuse assignments for the BMW 850i.

About the Author

Expert automotive knowledge and experience

ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

Facebook Contact

15+ Years

Experience

500+ Guides

Guides

50+ Makes

Vehicles

1000+ Solutions

Solutions

Diagnostic

Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.

Repair

Expert in both traditional mechanical repairs and modern vehicle systems.

Additional Expertise

Documentation

Created over 500 detailed repair guides and technical documents.

Training

Conducted technical training sessions and contributed to repair databases.

Certifications & Research

Certifications

ASE Master Technician Certification
Advanced Diagnostic Specialist
Hybrid/Electric Vehicle Systems
Performance Tuning Expert

Research & Community

Actively researches emerging technologies and contributes to automotive forums.

Legal Disclaimer

Important information about using this content

Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.

General Information

The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.

Warranty & Liability

The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.

We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

Technical Information

All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
Vehicle specifications and procedures may vary by model year, trim level, and region.
Always follow the manufacturer's recommended procedures and safety precautions.
Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
If you're unsure about any procedure, consult a qualified professional mechanic.

Intellectual Property

All content, including text, images, and specifications, is protected by copyright and other intellectual property laws. Any unauthorized use or reproduction is prohibited.