360 Degree View Camera: Operation
Image Display
The 360 degree view camera system is capable of generating several different views using the front, rear, LH side, RH side, CHMSL, and trailer cameras (if equipped), and the IPMB. The IPMB processes the video signals from the cameras and generates the appropriate views that are displayed on the FDIM. The views that are displayed are determined by the transmission gear selector position.
When the ignition is ON and reverse gear is selected, the rear camera views are shown on the FDIM. The Rear 360 + Normal view is shown first. Subsequent presses of the camera selection switch or on-screen buttons when reverse gear is selected allow the driver to cycle through the following rear camera views:
| View name | Description |
|---|---|
| Rear 360 + Normal | Contains the normal rear camera view, shown next to a 360 degree camera view. |
| Rear Normal | Provides an image of what is directly behind the vehicle. |
| Rear Split View | Provides an extended wide angle image of what is behind the vehicle. |
| Rear High View | Provides an image of the truck bed and can be used to align the vehicle with a fifth wheel or gooseneck trailer |
| Auxiliary View (if equipped) | Provides a rear view image from the back of a connected trailer while reversing |
| Trailer Reverse Guidance View (if equipped) | Provides a rear view image behind the vehicle using the side cameras, useful when reversing with a trailer. |
When the ignition is ON and any gear except reverse is selected, the front camera and 360 degree views are shown on the FDIM when the camera selection switch is pressed. The front images are available until the vehicle speed reaches 10 km/h (6 mph). The Front 360 + Normal view is shown first. Subsequent presses of the camera selection switch allow the driver to cycle through the following front camera views:
| View name | Description |
|---|---|
| Front 360 + Normal | Contains the normal front camera view, shown next to a 360 degree camera view. |
| Front Normal | Provides an image of what is directly in front of the vehicle. |
| Front Split View | Provides an extended wide angle image is what is in front of the vehicle. |
To enable the front or rear camera displays, the IPMB monitors the camera selection switch (if equipped) or on-screen button status from the APIM, gear position and vehicle speed messages. The PCM sends the gear position and vehicle speed messages to the GWM through the HS-CAN1 and the APIM sends the on-screen camera selection button status message to the GWM through the HS-CAN3. The GWM then sends the messages to the IPMB via HS-CAN2.
All camera views are generated by the IPMB, using the video signals from one or more of the cameras. The video signals are sent from the cameras to the IPMB through coaxial cables. The IPMB processes the image(s) from the cameras and sends a single image with the desired view to the APIM.
360 Degree Image Composition
To generate the 360 degree view, the IPMB combines and aligns the images from all 4 cameras to produce a single overhead view that is displayed on the FDIM along with a front or rear camera view.
Refer to: 360 Degree View Camera Alignment .
| Item | Description |
|---|---|
| 1 | Front camera image |
| 2 | LH side camera image |
| 3 | RH side camera image |
| 4 | Rear camera image |
Camera Image Generation
The front and rear cameras are on any time they receive voltage (when the ignition is ON), but a video signal is only generated under certain conditions. When reverse gear is selected or the camera selection switch is pressed, the IPMB sends an enable request message to the front and rear cameras to turn the video signal output on. When any gear except reverse is selected, the IPMB sends a disable request message to the cameras to turn the video signal off when the vehicle speed reaches 16 km/h (10 mph), and sends an enable request message to turn the video signal on when vehicle speed falls below 8 km/h (5 mph). If the front or rear camera is not configured properly, some features and views may be inoperative.
The LH and RH side cameras are on and generating a video signal any time they receive voltage from the IPMB. The IPMB supplies voltage to the LH and RH side cameras when reverse gear is selected or the camera selection switch is pressed.
LIN Communication
The IPMB communicates with the CHMSL camera via a LIN circuit, which is a dedicated single wire communication network.
The messages sent from the IPMB to the CHMSL camera are:
- Camera configuration data
- Guideline on/off request
- Standby enable/disable request
- Trailer connection status (if equipped with factory trailer tow)
The messages sent from the CHMSL camera to the IPMB are:
- Camera status
- Camera part number data
- Guideline status
Camera Features
The system supports several rear camera features to assist the driver.
The following features are driver selectable:
- Visual park aid alert - visually alerts the driver to objects causing the parking aid system to sound.
- Manual zoom - allows the driver to manually zoom the image.
- Video delay - allows the driver to see the image behind the vehicle after the vehicle is shifted out of reverse into any gear other than park.
The following features are not driver selectable:
- Fixed guidelines - displays guidelines to assist the driver with aligning the vehicle with an object.
- Active guidelines - displays the intended path of the vehicle based upon steering wheel input.
The system supports visual park aid alert on 360 + Normal and Normal views. Front and rear split view do not include visual park aid alert. For views that include the 360 degree overhead image, the visual park aid alert is generated by the IPMB. For views that do not include the 360 degree overhead image, the visual park aid alert feature is generated by the APIM.
To turn the manual zoom on and off, the driver generated commands originate at the FDIM, which is physically connected to the APIM. The APIM then zooms the image in or out.
The video delay feature is controlled within the APIM.
The fixed and active guidelines are generated by the IPMB and are not selectable by the driver.
Visual Park Aid Alert
The visual park aid alert feature displays a visual highlight in the zone where an object has been detected by the parking aid system. For views that include the 360 degree overhead image, the visual park aid alert is displayed as a color changing line around the perimeter of the 360 degree view overhead vehicle graphic. This visual park aid alert feature is generated by the IPMB. For rear camera views that do not include the 360 degree overhead image, the visual park aid alert feature is displayed as a vehicle icon in the upper part of the display. This icon is generated by the APIM. These features utilize the parking aid sensor data from the PAM to generate the visual highlights on the video image.
If the visual park aid alert feature is enabled, the feature is still operational even if the rear parking aid system has been disabled by the driver.
Fixed Guidelines
Fixed guidelines are only displayed on the rear camera image in Rear 360 + Normal and Rear Normal views.
A fixed center guideline is also shown by the CHMSL camera to assist the driver in locating the centerline of the vehicle.
The rear camera fixed guidelines feature displays guidelines on top of the rear video image to assist the driver with alignment of the vehicle. A dashed line on the displayed image represents the center of the vehicle and 3 color-coded lines (red, yellow, green) identify different zones between the rear of the vehicle and objects.
Fixed rear guidelines are not shown when the tailgate is open.
If the vehicle is equipped with a factory TRM, the fixed guidelines are not shown when a trailer is electrically connected to the vehicle.
Active Guidelines
If the guidelines remain inoperative, it may be necessary to disconnect the battery for 5 minutes with the driver's door open, then drive the vehicle for 8 kilometers (5 miles) in normal city driving before performing the procedure described above.
Active guidelines are only displayed on the rear camera image in Rear 360 + Normal and Rear Normal views.
The active guidelines feature displays dynamic guidelines that correspond to the projected path of vehicle travel, based on the current steering angle. Several modules are involved in generating the steering angle data used to support the active guidelines. The SCCM (vehicles without adaptive steering) or SASM (vehicles with adaptive steering) monitors the steering angle sensor and sends the steering wheel angle sensor data to the ABS module via the HS-CAN2. The ABS module uses this message to generate the steering angle message that is sent to the IPMB through the HS-CAN2. The IPMB sends the steering angle data to the rear parking aid camera via the LIN circuit. The camera uses this data to generate the active guidelines over the video image.
When the steering wheel is in the straight-ahead position, the active guidelines are not shown.
Active guidelines are not shown when the liftgate is open.
If the vehicle is equipped with a factory TRM, the active guidelines are not shown when a trailer is electrically connected to the vehicle.
Manual Zoom
If the manual zoom feature is on and the camera view is changed or the camera system is turned off, the manual zoom feature is disabled. The manual zoom feature must be re-enabled the next time the camera view is selected. When the driver turns the zoom on or off at the FDIM, the APIM zooms the camera image.
Video Delay
When the video delay is turned on, the APIM keeps the rear normal view display enabled after the transmission is shifted out of reverse gear, into any gear other than park, until the vehicle speed reaches 8 km/h (5 mph). With the delay off (default), the image displays until the transmission is shifted out of reverse gear.
360 Degree View Camera Alignment
To create a 360 degree overhead image from the 4 separate camera images, the IPMB must align the camera images to each other and to the vehicle. As the camera alignment is very sensitive, the alignment process is necessary any time a camera or any component that a camera is attached to is removed or adjusted.
The alignment process is completed using a diagnostic scan tool and the 360 degree view camera calibration mats. Refer to: 360 Degree View Camera Alignment .