System Operation: HUD
Network Message Chart - HUD
Module Network Input Messages - HUD Module
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Adaptive cruise control follow mode | IPMA | Input used to control the ACC component in the cruise control system display. |
| Adaptive cruise control gap distance display | IPMA | Input used to control the ACC component in the cruise control system display. |
| Adaptive cruise control target distance display | IPMA | Input used to control the ACC component in the distance indication display. |
| Adaptive cruise control warning request | IPMA | Input used to control the ACC component in the cruise control system display. |
| Camera configuration | IPMA | Input used to enable the lane keeping system display. |
| Cruise control override | PCM | Input used to control the cruise control and ACC displays. |
| Cruise control set speed | PCM | Input used to control the cruise control and ACC set speed displays. |
| Cruise control status | PCM | Input used to control the cruise control and ACC displays. |
| Forward collision warning request | IPMA | Input used to display the collision warning display. |
| HUD brightness menu request | IPC | Input used to control the HUD illumination menu display. |
| HUD settings active | IPC | Input used to turn on the HUD positioning menu. |
| HUD vertical adjustment menu request | IPC | Input used to control the HUD position of the display's blue frame. |
| Lane keeping system status display | IPMA | Input used to control the lane keeping system display. |
| Language selection | IPC | Input used to change the language displayed. |
| Message center feature configuration | IPC | Input used to configure the message center memory feature in the HUD. |
| Metric display | IPC | Input used to control the digital speedometer when the metric display is selected. |
| Steering wheel message center and HUD switch data | SCCM | Input used to control the message center and HUD navigation and functions. |
| Traffic jam assist status display | IPMA | Input used to control the lane centering assist indication display. |
| Traffic jam assist warning request | IPMA | Input used to control the lane centering assist indication display. |
| Trip unit selection | IPC | Input used to display the metric or English units. |
| Vehicle speed display | IPC | Input used to display the vehicle speed. |
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 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, 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:
- internal combiner HUD ambient light sensor value
- HUD brightness menu
The HUD uses an internal ambient light sensor to determine the illumination level of the display. The end-point of the light guide is forward-facing. The light sensor can be cleaned with caution, but cannot be repaired or replaced separately from the HUD.
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 IPC sends the HUD brightness menu message to the HUD module over the HS-CAN3 to open the brightness menu. The driver can then change the intensity level using the menu options.
Display Adjustments
The HUD provides adjustment settings to allow the driver to adjust the vertical position and size of the display to provide better viewing. The adjustments allow for vertical position adjustment of the blue display frame and vertical size adjustment 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 and HUD switch data message from the GWM over the HS-CAN3.
The GWM receives the steering wheel message center and HUD switch data message from the SCCM over the HS-CAN2.
Display Controls
The HUD display controls are 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 and HUD 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 and trip unit selection from the IPC over the HS-CAN3.