Friday, 16 June 2017 14:51

Do You Know Your Terms? Scanning, ESC, SAS and ADAS

Written by Toby Chess


When is the SAS calibrated?


Every time you repair/replace/R&I suspension components and in some cases, R&I a battery.

How many vehicles have ESC/SAS?

Hunter Engineering company states that Over 40 million vehicles on the road today require a reset/recalibration of the steering angle sensor (SAS) following a wheel alignment, as instructed by the vehicles manufacturer, on certain cars equipped with Electronic Stability Control (ESC). This number will continue to grow since all vehicles produced for USA consumption from 2012 on have been equipped with ESC. The procedure resets the steering angle to match the vehicle's new thrust line after the alignment has been completed.


The collision industry over the years dealt with 2 and 4 wheel alignments and number on insurance carriers said if you did work to the front suspension, only a two wheel alignment was called for. Today’s vehicles that are involved in an accident and require a wheel alignment, only one type of wheel alignment should be performed and that is a COMPLETE 4 WHEEL ALIGNMENT. The alignment process starts with adjusting the rear wheels so that they are parallel to the center line of the vehicle (zero thrust angle). Next the front wheels are adjusted so that they are in the same parallel plane as the rear wheels. When that operation is completed, the steering angle is set according to the OE’s specifications.


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It should be noted that the rear wheels are the directional wheels. Note that the rear wheels have a positive thrust angle and arrow points to the right (car will move to the right and if everything else in specs). The front wheels steer the vehicle.