The Importance of ADAS Calibration After Suspension Alignment and Structural Repairs
As modern vehicles become more advanced, they are being equipped with increasingly intricate safety systems known as Advanced Driver Assistance Systems (ADAS). These systems rely on sensors, radars, and cameras to provide essential safety functions such as lane keeping, adaptive cruise control, and collision warnings. However, the precise operation of these systems depends on the accurate positioning of their sensors. Small shifts in alignment—whether from a minor accident or routine suspension work—can drastically affect their performance.
Impact of Structural Repairs on ADAS Sensors
Modern vehicle frames are engineered to disperse impact forces along the structure to protect passengers. While this improves passenger safety, even a seemingly minor impact—especially to the rear or sides of the vehicle—can affect sensors throughout the entire vehicle.
Adaptive Cruise Control (ACC) and collision detection, can give faulty readings with only a few millimeters of misalignment.
According to AUDI and VOLKSWAGEN, any structural repair, particularly involving the front bar, bumpers, or rear axles, often necessitates ADAS calibration. For example, Audi’s ACC Radar requires re-calibration after the radar or front bar is adjusted following a collision.
HONDA and ACURA have similar requirements, being that after a structural repair a calibration is required on the Front Radar, Blind Spot Monitors, and the Windshield Camera.
Suspension Alignment and Its Influence on ADAS Calibration
Suspension alignment, or specifically the camber, caster, and toe angles, directly influences how a vehicle rests on the road. Even small changes in these angles can shift the positioning of sensors.When these angles are adjusted during suspension alignment, it can cause misalignment of ADAS sensors, such as those used for lane assist or collision avoidance.
AUDI and VOLKSWAGEN, for instance, specifies that if rear axle adjustments are made, re-calibration is required for the front radar, windshield camera, and 360° camera systems
Similarly, HONDA and ACURA vehicles necessitate an alignment inspection after a collision and before ADAS calibration. This is because slight shifts in suspension alignment can alter sensor angles, leading to inaccurate data readings.
The Growing Importance of Shared Data in Modern Vehicles
With increasing technological advancements, modern vehicles rely heavily on shared data between different systems. When a Lane Keep Assist system activates to help steer a car back into its lane, it may depend on data from the steering angle sensor and stability control system to determine how much correction is needed. These sensors are highly sensitive to changes in suspension alignment and require re-calibration after adjustments or repairs.
Most manufacturers require re-calibration of the steering angle sensor after a battery disconnection or suspension work. The stability assist sensors also need re-calibration under similar circumstances, as they work in conjunction with other ADAS features, such as traction control and electronic stability programs.
As automotive professionals, it is our responsibility to ensure that after any repairs, whether structural, suspension-related, or otherwise, that all required ADAS calibrations are performed. Misaligned sensors not only compromise the functionality of safety features but can also endanger the lives of drivers and passengers.
To maintain the safety and integrity of these systems, it is essential to follow manufacturer guidelines for post-repair calibration. This ensures that all ADAS features function as intended, keeping both drivers and pedestrians safe on the road.