Circuit/System Description

The Head-Up Display projects a full color image onto the windshield and is only viewable from the driver seat. The image location and brightness is adjustable using the Head-Up Display Switch. The image information is received from the Instrument Cluster through a video cable.

The Head-Up Display is a slave device to the Instrument Cluster. The Head-Up Display is powered through ignition voltage and ground. It communicates directly with Instrument Cluster via serial data and only has limited self-diagnosis capacity. Head-Up Display DTCs are reported through the Instrument Cluster.

The Head-Up Display Switch is a multiplexed switch that controls the Head-Up Display based on driver inputs. The Head-Up Display provides the switch with a low reference and monitors a signal circuit. The Head-Up Display Switch is made up of a resistor ladder and three switches: Dim +/-, Up/Down, and Page. When a switch is pressed, the signal voltage is pulled low through the resistor ladder. When pressed, each of the switches will result in a different signal voltage seen by the Head-Up Display, depending on the switch's location on the resistor ladder.