Head Up Display (HUD) Description and Operation: Speedometer

The speedometer is shown on the head-up display (HUD) as a 3-digit display. The HUD speedometer is capable of displaying up to 120 mph. The HUD receives a class 2 message from the engine control module (ECM) or the powertrain control module (PCM) indicating vehicle speed. If the class 2 message from the ECM/PCM is invalid the HUD will use a class 2 message from the electronic brake control module (EBCM) instead.