360 Degree View Camera
System Diagram
Network Message Chart
IPMB Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Camera commands | APIM | Commands the visual park aid alert and zoom level on and off based on driver inputs through the audio system display. |
| Driver door ajar status | BCM | Generates the door ajar icon on the image when the LH front door is ajar. |
| Gear lever position | PCM | Enables the front or rear camera views based on the current gear selection. |
| Left rear door ajar status | BCM | Generates the door ajar icon on the image when the left rear door is ajar. |
| Liftgate ajar | BCM | Disables the guidelines and visual park aid alert when the liftgate is open. |
| Parking aid sensor data | PAM | Generates the visual highlights in the zone where an object is detected by the parking aid system. |
| Passenger door ajar status | BCM | Generates the door ajar icon on the image when the RH front door is ajar. |
| Reverse gear state | PCM | Enables the front or rear camera views based on the current gear selection. |
| Right rear door ajar status | BCM | Generates the door ajar icon on the image when the right rear door is ajar. |
| Steering wheel angle | ABS Module | Generates the intended vehicle path for the active guideline feature. |
| Trailer lamp connected | TRM | Disables the guidelines and visual park aid alert when a trailer is electrically connected to the vehicle. (if equipped with trailer tow) |
| Vehicle speed | PCM | Supports the front and rear camera standby mode. Turns the camera image output off when vehicle speed is 16 km/h (10 mph) or greater and turns the camera image output on when the vehicle speed is 12 km/h (8 mph) or less. |
ABS Module Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Steering angle | PSCM | The ABS module uses the steering angle sensor data to generate the steering wheel angle message that is sent to the IPMB to support the active guideline feature. |
APIM Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Camera front display status | IPMB | Enables the video display when the camera selection switch is pressed. |
| Camera view status | IPMB | Indicates the active view that has been selected. |
| Camera zoom status | IPMB | Indicates the zoom view that has been selected. |
| Gear lever position | PCM | Enables and disable the video display based on the current gear selection. |
| Parking aid sensor data | PAM | Generates the visual highlights in the zone where an object is detected by the rear audible parking aid system. |
| Vehicle speed | PCM | When the video delay feature is turned on, this message is used to turn the rear camera display off after the vehicle speed exceeds a preset threshold. |
Image Display
The digital 360 degree view camera system is capable of generating several different views using the front, rear, LH side and RH side cameras, and the IPMB. All 4 cameras are powered and communicate to the IPMB over coaxial cable. The IPMB processes the video signals from the 4 cameras and generates the appropriate views that are displayed on the audio system display. The views that are displayed are determined by the transmission gear selector position.
When the ignition is on and reverse is selected, the rear camera views are shown on the audio system display. The Rear 360 + Normal view is shown first. Using the audio system display on-screen camera selection buttons when reverse is selected, the driver can 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. |
When the ignition is on and any gear except reverse is selected, the front camera and 360 degree views are shown on the audio system display 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. Using the audio system display on-screen camera selection buttons in any gear except reverse, the driver can 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 of what is in front of the vehicle. |
To enable the front and rear camera displays, the IPMB monitors the camera selection switch (integral to the FCIMB), 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 GWM then sends the messages to the IPMB via HS-CAN2. The camera selection switch is hardwired to the IPMB.
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. The IPMB creates the final video images seen at the display and applies video adjustments such as brightness and sharpness color.
360 Degree Image Composition
To generate the 360 degree view, raw video is sent to the IPMB in serialized data format, and the IPMB combines and aligns the images from all 4 cameras to produce a single overhead view that is displayed on the audio system display along with a front or rear camera view.
| 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 is selected or the camera selection switch is pressed, the IPMB sends an enable request message to the front and rear cameras over coaxial cables via LVDS 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 IPMB 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 sends an enable request message through coaxial cables via LVDS to the LH and RH side cameras when reverse is selected and the vehicle speed is below 8 km/h (5 mph) or the camera selection switch is pressed.
Camera Features
The following features are driver selectable:
- Visual park aid alert -- allows the driver to see the 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 audio system display, which is physically connected to the APIM. The commands are sent by the APIM to the IPMB via the HS-CAN3, GWM and HS-CAN2. The IPMB then sends the zoom command to the rear camera via a coaxial cable. The image is then zoomed in or out by the rear camera.
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 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.
The video 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 identify different zones between the rear of the vehicle and objects. The IPMB generates the fixed guidelines over the video image.
Fixed guidelines are not shown when the liftgate is open.
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 PSCM 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 from the PSCM to generate the steering angle message that is sent to the IPMB through the HS-CAN2. The IPMB 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.
Manual Zoom
The manual zoom is only supported by the rear camera. The manual zoom is only available for Rear 360 + Normal and Rear Normal views.
The manual zoom feature has one level of zoom. If the manual zoom feature is on and the vehicle is shifted out of reverse, the manual zoom feature is disabled. The manual zoom feature must be re-enabled the next time reverse is selected. When the driver turns the zoom on or off at the audio system display, the command is sent from the APIM via the HS-CAN3 to the GWM. The GWM then sends the message to the IPMB through the HS-CAN2. The IPMB sends the manual zoom request message to the rear parking aid camera via the coaxial cable. The camera then turns the zoom on or off.
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 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.
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.