Front And Rear Parking Aid Camera: Operation

Image Display

NOTE: The liftgate must be fully closed for correct operation of the rear parking aid cameras system.

The front and rear parking aid camera system is capable of generating several different views using the front camera, the rear camera and the IPMB. The IPMB processes the video signals from the 2 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 parking aid camera view is shown on the FDIM.

When the ignition is ON and any gear except reverse selected, the front parking aid camera views are shown on the FDIM when the front parking aid camera view switch is pressed. The front images are shown until the vehicle speed reaches 10 km/h (6 mph). The front normal view is shown first. Subsequent presses of the front parking aid camera view switch allow the driver to cycle between front normal and front split view.

The front split view provides an extended wide angle image of what is in front of the vehicle.

To enable the front or rear camera displays, the IPMB monitors the gear position and vehicle speed messages. The PCM sends the gear position and vehicle speed messages to the GWM through the HS-CAN1. 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 the front or rear cameras. The video signals are sent from the cameras to the IPMB through twisted pair, shielded circuits. The IPMB processes the image(s) from the cameras and sends a single image with the desired view to the APIM.

Camera Image Generation

The front and rear parking aid 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 front parking aid camera view 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 10 mph (16 km/h), and sends an enable request message to turn the video signal on when vehicle speed falls below 5 mph (8 km/h). If the front or rear camera is not configured properly, some features and views may be inoperative.

LIN Communication

The IPMB communicates with the front and rear cameras via a LIN circuit, which is a dedicated single wire communication network.

The messages sent from the IPMB to the front and rear cameras are:

Camera view request (front camera only)
Camera configuration data
Display manual zoom request (rear camera only)
Guideline on/off request (rear camera only)
Trailer connection status (if equipped with trailer tow)
Steering angle (rear camera only)
Standby enable/disable request

The messages sent from the front and rear camera to the BCM are:

Camera status
Display zoom status (rear camera only)
Camera part number data
Guideline status (rear camera only)

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.
Active guidelines - displays the intended path of the vehicle based upon steering wheel input.

The following features are not driver selectable:

Fixed guidelines - displays guidelines to assist the driver with aligning the vehicle with an object.

The system supports visual park aid alert on the rear and front normal camera views. 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.

To turn the manual zoom on and off, the driver generated commands originate at the FDIM, which is hardwired to the APIM. The commands are sent by the APIM to the IPMB via the HS-CAN3 then to the GWM over the HS-CAN2. The IPMB then sends the zoom command to the rear camera via the LIN circuit. 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 rear parking aid camera based on the IPMB commands.

Visual Park Aid Alert

NOTE: The on-screen alert transitions may not match changes in the audible parking aid alert tone frequency.

The visual park aid alert feature displays a visual highlight in the zone where an object has been detected by the parking aid system. 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. The feature utilizes the parking aid sensor data from the PAM to generate the visual highlights on the video image.

When an object is detected by the front or rear parking aid sensor, the parking aid sensor data message from the PAM is used by the APIM to generate the alert.

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

NOTE: The color-coded lines cannot indicate accurate or consistent distances between the rear of the vehicle and objects shown in the video image. This normal condition is due to variances in vehicle ride height, including, but not limited to, vehicle loading.

Fixed guidelines are only displayed on the rear camera image.

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 (red, yellow, green) identify different zones between the rear of the vehicle and objects.

Fixed guidelines are not shown when the liftgate is open.

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

NOTE: If the battery has been disconnected or discharged, or a module is disconnected or replaced, the active guidelines may be inoperative until the vehicle is driven on a flat and smooth road at 32 km/h (20 mph) or more, with hands placed loosely on the steering wheel and minimal steering correction for approximately 30 seconds.

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 5 miles in normal city driving before performing the procedure described above.

Active guidelines are only displayed on the rear camera image.

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 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 TRM, the active guidelines are not shown when a trailer is electrically connected to the vehicle.

Manual Zoom

The manual zoom is only supported by the rear camera.

The manual zoom feature 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. The manual zoom feature must be re-enabled the next time reverse gear is selected. When the driver turns the zoom on or off at the FDIM, 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 LIN circuit. The camera then turns the zoom on or off.

Video Delay

When the video delay is turned on, the APIM keeps the rear 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.