Rear Parking Aid Camera, CHMSL Camera, And Trailer Camera (3 Camera System): Operation

WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

Image Display

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

The 3 camera system is capable of displaying different camera views to visually aid the driver.

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.

While reverse gear is selected, the camera selection switch or on-screen button is used to cycle between the rear parking aid camera view, CHMSL camera view, and trailer camera view.

The rear and CHMSL 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, the cameras continuously generate a video signal. When any gear except reverse is selected, the cameras turn the video signal off when the vehicle speed reaches 16 km/h (10 mph), and turn the video signal on when vehicle speed falls below 8 km/h (5 mph). If the cameras are not configured properly, some features may be inoperative. The camera sends the video signal on shielded twisted pair wires directly to the display.

The trailer camera is ON any time it receives voltage.

The following rear parking aid camera features are driver selectable:

Visual park aid alert - assists the driver to visually see the object causing the parking aid system to sound. (centerstack infotainment display only)
Manual zoom - allows the driver to manually zoom the image. (centerstack infotainment display only)
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 rear parking aid camera features are not driver selectable:

Fixed guidelines - assists the driver with aligning the vehicle with an object.
Active guidelines - displays the intended path of the vehicle based upon steering wheel input.

The centerstack infotainment display 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 while reverse gear is selected. 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 IPMB on the HS-CAN2. The IPMB sends the zoom command to the rear camera or CHMSL camera. The zoom is generated by the camera.

The fixed and active guidelines are generated by the rear parking aid camera and are not selectable by the driver.

The fixed centerline is generated by the CHMSL camera and is not selectable by the driver.

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

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 on the rear camera video image 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 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.

The video camera fixed guidelines feature displays guidelines on top of the rear camera 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.

The guidelines are not shown when reverse is not selected (video delay active).

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

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 8 kilometers (5 miles) in normal city driving before performing the procedure described above.

The active guidelines feature displays dynamic guidelines on top of the rear camera image 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 on the HS-CAN2. The IPMB sends the steering angle data to the rear parking aid camera via the coaxial cable. The camera uses this data to generate the active guidelines over the video image.

If the steering wheel is in the straight-ahead position or if the liftgate is open, 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 factory 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 APIM through HS-CAN3 to the GWM, then over HS-CAN2 to the IPMB. The IPMB then sends the manual zoom request message to the CHMSL camera via the LIN circuit or the rear camera via the coaxial cable.

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 8 km/h (5 mph). With the delay off (default), the image displays until the transmission is shifted out of reverse gear.