System Operation: HUD

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Whenever the HUD is removed and reinstalled, the instrument panel is removed and reinstalled or replaced, a new HUD is installed or a new windshield is installed, the HUD must be calibrated to correctly display the image on the windshield The HUD module calibration is carried out using the engineering test mode.

For additional information, REFER To HEAD UP DISPLAY (HUD) MODULE .

Brightness Controls

The HUD display illumination is controlled by two sets of inputs: the base HUD background and driver selectable illumination level. The base HUD background display uses ambient day/nighttime lighting input, ambient lighting of the road ahead of the vehicle and an overall vehicle backlighting dimming level to determine the display illumination level. The driver then has the ability to select a desired illumination level from 1 to 13, which is selectable through the HUD menu. When a forward collision warning event is in progress, the illumination intensity is increased to provide an increased level of severity to the visual warning.

The HUD module uses the following inputs to control the illumination brightness:

ambient light sensor data.
ambient light sensor status.
day/night status.
HUD brightness menu.
illumination dimming level.

The base HUD background brightness is determined by the day/night status and the illumination dimming level messages sent from the BCM over the HS-CAN1 to the GWM. The GWM sends the day/night status and the illumination dimming level messages to the HUD module over the HS-CAN3.

The HUD also uses the ambient light sensor status and the ambient light sensor data messages sent from the SCCM to the GWM over the HS-CAN2 to establish a base illumination level. The GWM sends the ambient light sensor status and the ambient light sensor data messages to the HUD module over the HS-CAN3.

Once the HUD has established a base illumination level, the driver can then select a desired illumination level. When the driver has selected to change the intensity level, the HUD module receives the HUD brightness menu message from the IPC over the HS-CAN3.

Display Adjustments

The HUD provides adjustment settings to allow the driver to reposition the display on the windshield to provide better viewing. The adjustments allow for vertical and rotational adjustments through the HUD menu.

The HUD module receives the HUD settings active and HUD adjustment menu request messages from the IPC over the HS-CAN3.

The HUD module receives the steering wheel message center switch data message from the GWM over the HS-CAN3.

The GWM receives the steering wheel message center switch data message from the SCCM over the HS-CAN2.

Display Controls

The HUD display controls are through the RH steering wheel switch (HUD, back and settings buttons). The HUD module receives all switch control inputs from the GWM over the HS-CAN3. The GWM receives the steering wheel message center switch data message from the SCCM over the HS-CAN2.

Engineering Test Mode

To enter the HUD engineering test mode, begin with the ignition OFF. Press and hold the RH steering wheel switch OK button. Place the ignition ON and continue to hold the button for approximately 10 seconds until the HUD displays ETM in the upper LH corner of HUD image. Release the OK button within 5 seconds of ETM being displayed. Press the up or down arrow buttons to navigate through each of the display windows. To exit the HUD engineering test mode, place the ignition in OFF.

English/Metric, Language And Unit Selections

The HUD English/metric, language and unit selections are controlled by messages sent from IPC. The IPC is the controlling module for the English/metric, language and unit selections and is based on the driver selections. The IPC and the HUD English/metric, language and unit selections are displayed the same.

The HUD module receives the language selection, the temperature unit selection and the trip unit selection from the IPC over the HS-CAN3.