Lincoln Aviator: Instrumentation, Message Center and Warning Chimes / Description and Operation - Head Up Display (HUD) - System Operation and Component Description

System Operation

System Diagram

Network Message Chart

  Module Network Input Messages - HUD Module

HUD

NOTE: When the HUD is removed and reinstalled, the instrument panel is removed, 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. Carry out the HUD module calibration using the engineering test mode.

For addtional information,
Refer to: Head Up Display (HUD) Module Calibration (419-03C Collision Warning and Collision Avoidance System, General Procedures).

Brightness Controls

The HUD 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 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 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 features are controlled through the RH steering wheel switch. 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 ET in the upper LH corner of HUD image. Release the OK button within 5 seconds of engineering test mode 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 HUD selections based on the driver input. 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.

HUD Displays

Active Driver Assist

The active driver assist system display is located in the lower portion in the center of the HUD just above the speedometer display area.

The HUD provides the active driver assist display to indicate the following:

• Cruise control or ACC status
• Distance alert display
• Lane centering assist (traffic jam assist)
• Lane keeping system display
• Stop and go (part of the ACC system) display

BLIS/ CTA

The HUD provides BLIS indicators to warning the driver that a vehicle has entered the BLIS/ CTA monitored zones. The BLIS indication is displayed in the LH and RH sides of the HUD. The display area is also shared with the LH, RH and hazard indication area. If the turn or hazard indicators are on and a BLIS/ CTA alert is received, the HUD turns off the turn or hazard indication and displays the applicable BLIS warning.

The HUD module receives all messages from the GWM over the HS-CAN3.

The GWM receives the cross traffic alert left status, side obstacle sensor status-left and side obstacle left warning messages from the SODL over the MS-CAN.

The GWM receives the cross traffic alert right status, side obstacle sensor status-right and side obstacle right warning messages from the SODR over the MS-CAN.

Clock

The HUD provides a clock display that is controlled by a global vehicle clock strategy in the BCM. The HUD module receives the global clock data from the GWM over the HS-CAN3. The GWM receives the global clock data from the BCM over the HS-CAN1.

Cruise Control/ACC With Stop And Go

The ACC display provides the gap and follow distance (as a graphical distance display) as well as the set speed (shown below the ACC RTT indicator).

The stop and go feature (part of the ACC) provides vehicle braking, stopping and accelerating based on the status of the vehicle in front. The display provides a graphical distance display with increasing or decreasing levels of fill depending on the vehicle's distance from the vehicle in front of it.

The HUD module receives all messages required to control the cruise control/ ACC and stop and go displays from the GWM over the HS-CAN3.

The GWM receives the cruise control override, cruise control set speed and the cruise control status messages from the PCM over the HS-CAN1.

The GWM receives the following messages from the IPMA over the HS-CAN2.

• Adaptive cruise control follow mode display
• Adaptive cruise control gap distance display
• Adaptive cruise control target distance display
• Adaptive cruise control warning request
• Adaptive cruise control stop mode
• Adaptive cruise control resume display

Digital Speedometer

The HUD provides a digital vehicle speed display in the lower center of the HUD. When the digital speedometer is selected on in the HUD, the speedometer in the IPC only shows a minimal detail. The HUD module receives the vehicle speed display and metric display messages from the IPC over the HS-CAN3.

Distance Alert

The active driver assist display provides a distance alert as part of the ACC displays to indicate the distance to the vehicle in front and visually provide warning when the vehicle is too close. The graphical distance display on the road becomes a solid image that increases or decreases fill based on the distance to the vehicle in front of it. As the vehicle approaches a distance requiring an alert, the display fill turns from amber to red.

The HUD module receives the forward distance alert warning indicator request message from the GWM over the HS-CAN3. The GWM receives the forward distance alert warning indicator request message from the IPMA over the HS-CAN2.

DTE - Electric Vehicle (EV) Range

The HUD provides an Electric Vehicle (EV) range display indicating the approximate distance the vehicle can travel on the current battery charge. The indication is displayed in the lower RH corner of the HUD, above the DTE display.

The HUD receives the EV range display message from the GWM over the HS-CAN3. The GWM receives the EV range display message from the PCM over the HS-CAN1.

DTE - Low Fuel

The HUD provides a DTE display that ranges from 0 to 999 km/miles in the lower RH corner of the HUD. The display provides both the DTE and a low fuel warning that changes the fuel icon from white to amber. The HUD module receives the fuel range display and fuel level warning messages from the IPC over the HS-CAN3.

Forward Collision Warning Alert

The HUD provides a forward collision warning alert display, which consists of a single red bar across the center of the display, to alert the driver of a possible front collision event. All other selected HUD displays will be hidden when the forward collision alert is displayed.

The HUD module receives the forward collision warning indicator request message from the GWM over the HS-CAN3. The GWM receives the forward collision warning indicator request message from the IPMA over the HS-CAN2.

Infotainment-Navigation And Phone

The HUD provides audio, navigation and phone information. The HUD receives the audio-navigation switch button states message from the GWM over the HS-CAN3. For additional audio, navigation and phone information,
Refer to: Information and Entertainment System (415-00 Information and Entertainment System - General Information, Diagnosis and Testing).

The HUD receives the voice recognition status message from the APIM over the HS-CAN3.

The HUD module receives the audio source status and audio system response status messages from the ACM over the HS-CAN3.

The GWM receives the audio-navigation switch button states message from the SCCM over the HS-CAN2.

Lane Centering (Traffic Jam) Assist

The HUD provides a lane centering indicator in the center display along with the adaptive cruise control and lane keeping system displays. The displays indicate the system is active or cancelled, or notifies the driver when intervention is required.

The HUD module receives the traffic jam assist status display and traffic jam assist warning request messages from the GWM over the HS-CAN3. The GWM receives the traffic jam assist status display and traffic jam assist warning request messages from the IPMA over the HS-CAN2.

Lane Keeping System

The lane keeping system combines the lane keeping alert and lane keeping aid systems. The lane keeping alert system alerts the driver of unintentional drifting outside of the lane and the lane keeping aid system corrects the vehicle steering to keep the vehicle in the center of the lane. The HUD provides a lane keeping display with a view of the vehicle in the middle of a lane with right and left lane markers to indicate the vehicle position with relation to the lane markings and arrows on either side of the vehicle. The lane markers and arrows change color based on the vehicle position within the lane and any required intervention to keep the vehicle in the center of the lane. For additional information on the lane keeping system operation,
Refer to: Lane Keeping System - System Operation and Component Description (419-07 Lane Keeping System, Description and Operation).

The HUD module receives the camera configuration and lane keeping system status display messages from the GWM over the HS-CAN3.

The GWM receives the camera configuration and lane keeping system status display messages from the IPMA over the HS-CAN2.

LH, RH Turn And Hazard

The LH, RH turn and hazard indication displayed in the HUD is redundant to the LH, RH turn and hazard indication displayed in the IPC. The HUD displays the LH, RH turn and hazard indication in the lower LH and RH sides of the HUD screens. The display area is also shared with the BLIS indication, which takes precedence over the turn or hazard indication.

The HUD module receives the left turn lamp on request and right turn lamp on request messages from the GWM over the HS-CAN3. The GWM receives the left turn lamp on request and right turn lamp on request messages from the BCM over the HS-CAN1.

Memory Set/Recall

The HUD provides the ability for the driver to retain personalized settings for up to 3 drivers. For additional information related to the vehicle memory features,
Refer to: Front Seats - System Operation and Component Description (501-10A Front Seats, Description and Operation).

The HUD receives the memory command message from the GWM over the HS-CAN3.

The GWM receives the memory command message from the DSM over the MS-CAN.

Outside Air Temperature

The HUD provides an outside air temperature display in the lower LH corner of the display next to the clock. The Ambient Air Temperature (AAT) sensor is hardwired to the PCM through separate input and return circuits. The PCM provides a reference voltage to the Ambient Air Temperature (AAT) sensor and monitors the change in voltage resulting from changes in resistance as determined by outside air temperature.

The PCM is programmed to update the messaged outside temperature data at different rates depending on several criteria (current engine temperature, engine off time and vehicle speed) to prevent false temperature displays due to a condition known as heat soaking. Heat soaking is where the outside air temperature is hotter in the location of the Ambient Air Temperature (AAT) sensor than the actual outside air temperature.

The PCM sends the ambient air temperature data to the GWM through the HS-CAN1. The GWM sends the ambient air temperature data message to the HVAC module over the MS-CAN. The HVAC module sends the filtered outside air temperature data through the GWM to the HUD module over the HS-CAN3.

Speed Sign Display

The HUD provides a speed sign display based on the traffic sign recognition data received from the IPMA. The HUD module receives the traffic sign recognition status request message from the GWM over the HS-CAN3. The GWM receives the traffic sign recognition status request message from the IPMA over the HS-CAN2.

Transmission Gear

The HUD provides a transmission gear display just to the left of the digital speedometer in the lower center of the HUD to indicate what gear has been selected. The HUD module receives the transmission gear display and transmission gear display mode messages from the GWM over the HS-CAN3. The GWM receives the transmission gear display and transmission gear display mode messages from the PCM over the HS-CAN1.

Component Description

HUD Module

The HUD provides the driver with an alternative view of the driver information and forward collision warnings on the windshield, at the driver's forward viewpoint. The HUD module receives all appropriate messages on the HS-CAN3. Whenever a new HUD is installed, the HUD module requires a PMI.

When the HUD is removed and reinstalled, the instrument panel is removed, installed or replaced, a new HUD is installed or a new windshield is installed, the HUD module must be calibrated to correctly display the image on the windshield.
Refer to: Head Up Display (HUD) Module Calibration (419-03C Collision Warning and Collision Avoidance System, General Procedures).

HUD Control Switch

The HUD functions are controlled using the upper RH steering wheel switch, through the IPC message center menu. The RH steering wheel switch connects to the SIMA. The SIMA is connected to the SCCM through a private CAN. The SCCM receives the switch signals from the SIMA over the private CAN, then sends the switch signals to the IPC through the GWM over the HS-CAN3 to operate the HUD selections in the message center.