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Home >> Cadillac >> 2019 >> CTS Base, AWD >> Repair and Diagnosis (Single Page) >> External Pages >> Different car >> Section 82 (Cellular System, Entertainment System, And Navigation System - Description And Operation) >> Description and Operation >> OnStar Description and Operation (UE1 without IOS/IOT) >> Compass Heading
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Compass Heading

WARNING: This page is about a different car, the 2018 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

The telematics communication interface module has a compass feature to calculate vehicle direction which is displayed via the instrument panel cluster or designated display. The compass heading is determined by dead reckoning until the GPS 3d fix is established. The dead reckoning is accomplished by using the yaw rate sensors and wheel ticks to determine heading changes from a GPS known heading. The GPS 3d fix heading is determined by the deferential of two locations. If "CAL" is displayed on the Instrument Panel Cluster or designated display refer to the owners manual for steps to calibrate the compass.

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