In today's automotive landscape, safety and stability are paramount. Modern vehicles come equipped with advanced safety and stability systems like ABS, ESC, TCS, and ADAS, which rely on precise data to function effectively. This data comes from a critical component known as the steering angle sensor.

What Is Steering Angle Sensor Calibration (ISM Module Reset)?

Steering Angle Sensor Calibration, also referred to as ISM Module Reset, is a vital procedure to ensure the accuracy of this crucial sensor. This calibration process safeguards your driving experience and enhances your vehicle's safety features.

The Role of the Steering Angle Sensor

The steering angle sensor is typically located within the steering column or steering gear assembly. It continuously monitors your steering input and the vehicle's direction by measuring the angle of the steering wheel.

Why Calibration Matters

Over time, factors like mechanical wear, alignment changes, or component replacements can cause the steering angle sensor's calibration to drift. This can lead to incorrect readings, potentially triggering safety and stability system interventions when they are unnecessary or failing to engage them when needed.

How the Calibration Works

Here's how the ISM Module Reset or Steering Angle Sensor Calibration works:

  • Ensure the vehicle is on a level surface.
  • Center the steering wheel.
  • A trained technician uses specialized equipment to access the vehicle's diagnostic system.
  • The calibration process is initiated through the diagnostic tool, instructing the vehicle's computer to reset and recalibrate the steering angle sensor.
  • The sensor is recalibrated, providing an accurate reference point for the vehicle's safety and stability systems.

Benefits of Proper Calibration

A well-calibrated steering angle sensor ensures the effectiveness of advanced safety features. It contributes to safer driving by preventing false alarms or interventions from ABS, ESC, TCS, and ADAS systems.

Professional Service Matters

It's crucial to emphasize that an ISM Module Reset or Steering Angle Sensor Calibration should be performed by trained automotive technicians with specialized equipment. This ensures the reliability of your vehicle's safety and stability systems, promoting safer and more secure driving.

ISM Module Reset, is an essential maintenance procedure that helps guarantee the precision of safety and stability systems in modern vehicles. Prioritizing this calibration contributes to safer driving experiences and helps keep your advanced safety features functioning optimally.


  • Car struggles to start.
  • Gears on the car won't change.
  • high revs per minute.
  • A cluster light dims.
  • Due to a breakdown in communication with the Transmission Control Module, the vehicle won't start.
  • Data including errors from the actuator motor in the Intelligent Servo Module component A80 (ISM)
  • Car shakes a lot while it is idling.

Other symptoms include car not shifting gears between P, R, N, or D. ISM in full Intelligent Servo Module’s main purpose is that it enables the system to read the selected drive position via electrical signals and to engage the drive position via a mechanical interface on the transmission. The Mercedes ISM system is located on the driver’s side on the transmission housing. If you are experiencing any of the above-listed issues with your car, we recommend giving us a visit.