23/01/2020                                                                            
                                    
                                                                            
                                            Q: After a four-wheel alignment check with adjustments, will the ADAS require a calibration?
If the vehicle is fitted with any type of forward facing, body mounted Radar (ACC, City Safety, Distronic etc) then the Vehicle Manufacturers Method Statement should be followed and if required, a calibration checked and recalibrated, with the issue of a relevant Calibration certificate, copies of which should be retained by the workshop for future reference.
Q: Is there a legal requirement that the ADAS needs to be functioning correctly?
The automatic braking system is only one of the many ADAS fitted on vehicles today. In this respect, the European Parliament has already approved the proposal to make driver assistance systems mandatory on all new type-approved vehicles as soon as possible. As a mandatory fitted safety system it is envisaged that the system will have to be checked for any warning indicators for test purposes, as are ABS and Airbag.
Q: If the ADAS isn’t working correctly, how could this affect the vehicles performance?
To do their job, ADAS systems rely on inputs from a variety of sensors that allow them to “see” what is happening around the vehicle. The most common are camera, radar, laser, lidar and ultrasonic sensors. Steering sensors are also used to help determine the direction of vehicle travel. Some systems use information from a single type of sensor, but others combine information from multiple sensors – a process called sensor fusion – to obtain a more accurate “view” of the situation.
Most ADAS sensors are very precisely aimed and require calibration if their positions are disturbed in any way. Consider that a sensor out of alignment by a fraction of an inch or even one degree on the vehicle will be aimed at an area significantly off axis 50 or more metres down the road. Misaimed sensors often result from collisions – even a minor accident can knock ADAS sensors out of alignment. However, calibration can also be required as a by-product of common vehicle service work such as windscreen replacement, suspension repair or wheel alignment.
If there are issues with any speed related signal, then the ADAS and other systems will be disabled. Many ADAS systems can be activated/deactivated by the driver, through the Infotainment Centre and optional switches.