Rear Only Parking Aid Camera
System Diagram
Network Message Chart
BCM Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Camera commands | APIM | Used to command the zoom level on and off based on driver inputs through the FDIM. |
| Gear lever position | PCM | Used to support the rear parking aid camera standby mode. Turns the camera image output on when reverse gear is selected. |
| Parking aid sensor data | PAM | Used to generate the visual highlights in the zone where an object is detected by the rear parking aid system. |
| Steering angle | ABS Module | Used to generate 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 | Used to support the rear parking aid camera standby mode. Turns the camera image output off when vehicle speed 16 km/h (10 mph) or greater and turns the camera image output on when the vehicle speed is 8 km/h (5 mph) or less. |
IPMB Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Camera commands | APIM | Used to command the zoom level on and off based on driver inputs through the FDIM. |
| Gear lever position | PCM | Used to support the rear parking aid camera standby mode. Turns the camera image output on when reverse gear is selected. |
| Parking aid sensor data | PAM | Used to generate the visual highlights in the zone where an object is detected by the rear parking aid system. |
| Steering angle | ABS Module | Used to generate 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 | Used to support the rear parking aid camera standby mode. Turns the camera image output off when vehicle speed 16 km/h (10 mph) or greater and turns the camera image output on when the vehicle speed is 8 km/h (5 mph) or less. |
ABS Module Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Steering wheel angle sensor data | PSCM | The ABS module uses the steering angle sensor data to generate the steering angle message that is sent to the BCM to support the active guideline feature. |
FCDIM Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Gear lever position | PCM | Used to enable and disable the rear video display. |
| Parking aid sensor data | PAM | Used to generate the visual highlights in the zone where an object is detected by the rear 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. |
APIM Network Input Messages
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Camera status | IPMB | Used to display the current status for active guidelines and visual park aid alert. |
| Gear lever position | PCM | Used to enable the video display when reverse gear is selected. |
| Parking aid sensor data | PAM | Used to generate the visual highlights in the zone where an object is detected by the rear 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 - 203 mm (8 inch) Touchscreen Display
The rear parking aid camera image is displayed by the FDIM when reverse gear is selected. To determine the selector lever position and enable the camera display, the PCM sends the gear position message to the GWM on the HS-CAN1. The GWM then sends the message to the APIM via the HS-CAN3.
The camera is on any time it receives voltage (when the ignition is ON), but a video signal is only generated under certain conditions. When reverse gear is selected, the camera continuously generates a video signal. When any gear except reverse is selected, the camera turns the video signal off when the vehicle speed reaches 16 km/h (10 mph), and turns the video signal on when vehicle speed falls below 8 km/h (5 mph). If the camera is not configured properly, some features may be inoperative. The camera sends the video signal on shielded twisted pair wires to the APIM, which displays the image on the FDIM.
The following parking aid camera system features are driver selectable:
- Visual park aid alert - assists the driver to visually see the object 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 camera system features are not driver selectable:
- Active guidelines - displays the intended path of the vehicle based upon steering wheel input.
- Fixed guidelines - assists the driver with aligning the vehicle with an object.
The FDIM settings menu is used to turn the visual park aid alert and video delay on and off. The visual park aid alert and video delay features are generated within the APIM.
To turn the manual zoom feature on and off, the driver uses an on screen button located on the FDIM while in reverse. The driver generated commands originate at the FDIM, which is hardwired to the APIM. The APIM sends the driver generated commands over the HS-CAN3 to the GWM. The GWM then sends the commands to the BCM on the HS-CAN1. The BCM sends the zoom command to the rear parking aid camera via the LIN circuit. The zoom is generated by the rear parking aid camera.
The fixed and active guidelines are generated by the rear parking aid camera and are not selectable by the driver.
Image Display - 107 mm (4.2 inch) Centerstack Infotainment Display
The rear parking aid camera image is displayed by the FCDIM when reverse gear is selected. To determine the selector lever position and enable the camera display, the PCM sends the gear position message to the GWM on the HS-CAN1. The GWM then sends the message to the FCDIM via the HS-CAN3.
The camera is on any time it receives voltage (when the ignition is ON), but a video signal is only generated under certain conditions. When reverse gear is selected, the camera continuously generates a video signal. When any gear except reverse is selected, the camera turns the video signal off when the vehicle speed reaches 16 km/h (10 mph), and turns the video signal on when vehicle speed falls below 8 km/h (5 mph). If the camera is not configured properly, some features may be inoperative. The camera sends the video signal on shielded twisted pair wires to the FCDIM.
The following parking aid camera system are driver selectable:
- Visual park aid alert - assists the driver to visually see the object 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 camera system features are not driver selectable:
- Active guidelines - displays the intended path of the vehicle based upon steering wheel input.
- Fixed guidelines - assists the driver with aligning the vehicle with an object.
The visual park aid alert and video delay are turned on and off in the FCDIM. The visual park aid alert and video delay features are generated within the FCDIM.
To turn the visual park aid alert and manual zoom features on and off, the driver generated commands originate from the FCDIM. The FCDIM sends the driver generated commands to the GWM on the HS-CAN3 and the GWM sends the commands from the HS-CAN3 to the BCM on the HS-CAN1. The BCM then sends the command to the rear parking aid camera via the LIN circuit. The visual park aid alert feature is generated by a combination of the rear park aid camera and the FCDIM and the manual zoom is generated by the rear parking aid camera.
The fixed and active guidelines are generated by the rear parking aid camera and are not selectable by the driver.
LIN Communication
The BCM (rear only parking aid camera system without PTBA) or the IPMB (rear only parking aid camera system with PTBA or 360 degree view camera system) and the rear parking aid camera communicate via a LIN circuit which is a dedicated single wire communication network.
The messages sent from the BCM or the IPMB to the camera are:
- Camera configuration data
- Display manual zoom request
- Guideline on/off request
- Trailer connection status (if equipped with trailer tow)
- Steering angle
- Standby enable/disable request
The messages sent from the camera to the BCM or the IPMB are:
- Camera status
- Display zoom status
- Camera part number data
- Guideline status
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 rear parking aid system. This feature utilizes the parking aid sensor data from the PAM to generate the visual highlights on the video image. When reverse gear is selected and an object is detected by a rear parking aid sensor, the parking aid sensor data message from the PAM is used by the FCDIM or APIM to generate the alert.
For vehicles equipped with a 4.2 in (107 mm) display, 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
The video camera fixed guidelines feature displays guidelines on top of the 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.
If the vehicle is equipped with a TRM, the fixed guidelines are not shown when a trailer is electrically connected to the vehicle.
Active Guidelines
If the guidelines are remain inoperative, it may be necessary to disconnect the battery for 5 minutes with the driver's door open, then drive the vehicle for 5 miles in normal city driving before performing the procedure described above.
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 GWM on the HS-CAN2. The GWM then sends the message to the BCM via the HS-CAN1. The BCM 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.
If the steering wheel is in the straight-ahead position, the active guidelines are not shown.
The guidelines are not shown when reverse is not selected (video delay active).
If the vehicle is equipped with a TRM, the active guidelines are not shown when a trailer is electrically connected to the vehicle.
Manual Zoom
The manual zoom feature is generated by the rear parking aid camera and has one level of zoom. If the manual zoom feature is on and the vehicle is shifted out of reverse gear, the manual zoom feature is disabled and must be re-enabled the next time reverse gear is selected. When the driver turns the zoom on or off at the FDIM or FCDIM, the zoom command is sent through HS-CAN3, GWM, and HS-CAN1 to the BCM. The BCM then sends the manual zoom request message to the rear parking aid camera via the LIN circuit. The camera then turns the zoom on or off.
Video Delay
When the video delay is turned on, the display keeps the rear video display enabled after the transmission is shifted out of reverse gear, into any gear other than park, until the vehicle speed reaches 10 km/h (6 mph). With the delay off (default), the image displays until the transmission is shifted out of reverse gear.