In one embodiment, a vehicle mirror includes an on-board diagnostics (OBD) transceiver and one or more processors. The processors access OBD data received by the OBD transceiver from an OBD port of a vehicle. The processors further determine, from the OBD data, a vehicle type, a change in voltage of the vehicle's battery, and a secondary vehicle factor. When the vehicle is determined to be a combustion engine vehicle, the processors transition the vehicle mirror from a sleep power state to an awake power state when the change in voltage is greater than a predetermined amount and the secondary factor of the vehicle is greater than a predetermined threshold. When the vehicle is determined to be an electric vehicle, the processors transition the vehicle mirror from the sleep power state to the awake power state when any activity is detected in the OBD data and the secondary factor of the vehicle is greater than the predetermined threshold.