HUD - LED Display
WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
The HUD contains red LEDs that warn the driver of a possible collision event when commanded by the CCM.
There are certain situations when the warning LEDs cannot be seen, such as bright sunlight or when wearing sunglasses. The HUD module has a temperature sensor circuit that is integral to the module that senses the temperature of the LEDs internal to the module. When a high passenger compartment temperature such as strong sunlight is sensed by the temperature sensor, the warning LEDs can be temporarily disengaged. If this occurs, only the audible warning chime is used.
Warnings may not appear if there is little distance to the vehicle ahead or abrupt steering wheel and pedal movements are made.