Understanding ASIL: Ensuring Safety in EVs

Aug 2, 2023


Understanding ASIL: Ensuring Safety in Electric Vehicles

Himanshu Surana
Functional Safety Lead

In the constantly evolving automotive industry, safety is a top priority for manufacturers and consumers alike. To ensure the integrity of road vehicles and mitigate potential risks, the Automotive Safety Integrity Level (ASIL) plays a vital role. 

ASIL is a risk classification system embedded within the ISO 26262 standard, which focuses on the functional safety of automobiles. By understanding ASIL and its significance, automotive companies can enhance safety measures to avoid unreasonable risks and build vehicles that meet stringent standards.

What is functional safety and why is it important?

Functional safety in the automotive refers to the ability of a system or component to operate correctly and safely, even when faced with potential malfunctions or failures. It focuses on preventing or mitigating hazards caused by systematic failures and random hardware failures, ultimately reducing the risk of harm to vehicle occupants and other road users. 

Modern vehicles are equipped with a wide range of electronic and software-controlled systems responsible for critical functions, such as braking, steering, and acceleration. These systems interact and communicate with each other, making the vehicle more efficient and capable but also raising safety concerns. Malfunctions or failures in any of these systems could lead to serious accidents and injuries. 

Addressing these safety concerns, the ISO 26262 standard was introduced, to achieve functional safety in road vehicles. The standard outlines various processes and methods that automotive manufacturers must follow throughout the vehicle development lifecycle, including concept, design, production, operation, maintenance, and decommissioning. 

By incorporating functional safety into the development process, automakers can systematically evaluate safety risks, design effective safety measures, and ensure compliance with stringent safety standards. This proactive approach not only helps in reducing the risk of accidents but also builds trust and confidence among consumers, who can rest assured that the manufacturer has thoroughly evaluated and addressed potential safety risks. 

ASIL classification is based on three fundamental factors: severity, exposure, and controllability. Severity evaluates the potential seriousness of injuries resulting from a hazardous event, exposure examines the frequency of conditions that could lead to harm, and controllability measures the likelihood of driver intervention to prevent injury. By considering these factors, manufacturers can assess the risk associated with various systems and components. 

ASIL is categorized into four distinct levels: ASIL A, ASIL B, ASIL C, and ASIL D. Additionally, a fifth level, known as QM (Quality Management), applies to non-hazardous systems or components that solely require compliance with standard quality management practices. Each ASIL level represents a different level of risk, with ASIL D representing the highest and ASIL A the lowest. 

Understanding ASIL applications


This level encompasses critical safety features that have a direct impact on mitigating life-threatening injuries and ensuring the overall safety of the vehicle and its occupants. Components such as airbags, antilock braking systems, and electric power steering fall under ASIL D.



Adaptive cruise control, battery management systems, and suspension systems are examples of components classified as ASIL C. Another significant example of an ASIL C-rated component is the ampEMU, which is designed with high safety for electric vehicles. It features exceptional fault tolerance and redundancy, ensuring a high level of protection against potential risks such as fire and charger malfunctioning.  



Brake lights, rearview cameras, and instrument clusters are systems categorized as ASIL B. These features contribute to enhancing driver awareness and maintaining safe driving conditions, but the risks associated with them are relatively lower. 



Rear lights, heating and cooling mechanisms, and body control units fall into the ASIL A category. While essential for vehicle functionality and occupant comfort, the risks associated with these components are relatively minimal compared to higher ASIL levels. 



The QM level encompasses non-hazardous systems or components that primarily require adherence to standard quality management practices. Examples include GPS/navigation systems, satellite/digital radios, and connectivity features like USB, HDMI, and Bluetooth. 

Mitigates life-threatening injuries Fault Tolerance and redundancy Maintains safe driving conditions Heating and Cooling Mechanisms Non-hazardous system
Airbags Adaptive cruise control Brake lights Rear Lights GPS/Navigation system
Antilock Braking Systems (ABS) Battery Management Systems Rearview cameras Body Control Units Satellite/Digital Radios
Electric Power Steering Suspension systems Instrument clusters Onboard Diagnostics (OBD) Port USB, HDMI, and Bluetooth
Rear Cross-Traffic Alert (RCTA) Traffic Sign Recognition (TSR) Forward Collision Warning (FCW)


Adhering to ASIL guidelines is crucial for automakers to demonstrate their commitment to safety and compliance. By incorporating ASIL into their development processes, manufacturers can identify potential risks, design effective safety measures, and perform rigorous testing to ensure that their vehicles meet the highest safety standards. 

Furthermore, ASIL plays a vital role in building trust and confidence among consumers. When purchasing a vehicle, customers can have peace of mind knowing that the manufacturer has minutely evaluated and addressed potential safety risks. ASIL-guided implementation not only enhances safety but also serves as tangible proof of a manufacturer’s dedication to protecting the lives and well-being of vehicle occupants and road users. 

Overall, ASIL is a fundamental component of automotive safety, enabling manufacturers to assess and address safety risks associated with various systems and components. By understanding the ASIL classification system and applying it diligently, automakers can enhance safety measures, build reliable vehicles, and instill confidence in consumers. As technology advances and new safety challenges emerge, functional safety implementation will continue to evolve, guiding the industry toward safer and more secure mobility for everyone on the road. 


With its perfect blend of software and hardware, AMP is revolutionizing electrification. Headquartered in Los Angeles, with offices in Detroit, Bengaluru, and Shanghai, AMP is a global leader in energy management solutions for e-mobility. Since 2017, AMP has advanced battery management technology, through industry-leading software and hardware. AMP continues to push mobility further from intelligent battery management platforms to robust fast-charging systems and complete cloud solutions for e-mobility.

To learn more, visit AMP at and follow on LinkedIn@amp-energy-management.