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 Panel Cluster Control Module through a video cable.

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

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.