HUD English/Metric
WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
The head-up display (HUD) illuminates the speedometer in either english (mph) or metric (km/h) units depending upon the serial data message received from the instrument panel cluster (IPC).