Land Rover Discovery Owners & Service Manuals

Land Rover Discovery: Parking Aid Control Module (PACM)

Parking Aid Control Module (PACM)

The Parking Aid Control Module (PACM) is located in the right rear quarter panel, behind the side trim panel of the luggage compartment.

The PACM has two connectors which provide power, ground, High Speed (HS) Controller Area Network (CAN) chassis bus connections, front and rear parking aid sensors and front and rear park assist sensors.

The HS CAN chassis bus connections provide for the receipt of the following information from the systems:

  • Anti-lock Brake System (ABS) control module - Road speed signal.
  • Transmission Control Module (TCM) - Reverse (R) and Drive (D) gear engaged signal.

The PACM also outputs messages on the HS CAN chassis bus. The Gateway Module (GWM) processes these messages and converts them into Medium Speed (MS) Controller Area Network (CAN) comfort bus messages, which are sent to the Audio Head Unit (AHU) for vehicles fitted with InControl system, InControl Pro system and InControl Plus system or to the Touch Screen (TS) for vehicles fitted with Land Rover audio system and Meridan surround system.

InControl System

The Audio Head Unit (AHU) will process the Medium Speed (MS) Controller Area Network (CAN) comfort bus messages received from the Parking Aid Control Module (PACM) via the Gateway Module (GWM) by emitting the applicable warning tone to the front or rear audio speakers when an object is detected by the front or rear parking aid and park assist sensors.

A warning tone can also be emitted to alert the driver to a fault in the parking aid or park assist systems.

InControl Pro and InControl Plus System

The Audio Head Unit (AHU) will process the Medium Speed (MS) Controller Area Network (CAN) comfort bus messages received from the Parking Aid Control Module (PACM) via the Gateway Module (GWM) and then send to the Audio Amplifier Module (AAM) via a MS CAN infontianment bus.

The AAM will then emit the applicable warning tone to the front or rear audio speakers when an object is detected by the front or rear parking aid and park assist sensors.

A warning tone can also be emitted to alert the driver to a fault in the parking aid or park assist systems.

Land Rover Audio System and Meridan Surround System

The Touch Screen (TS) will process the Medium Speed (MS) Controller Area Network (CAN) comfort bus messages received from the Parking Aid Control Module (PACM) via the Gateway Module by converting the MS CAN comfort bus messages into Media Orientated System Transport (MOST) signals. These signals are then used by the Audio Amplifier Module (AAM) to emit the applicable warning tones from the front or rear audio speakers when an object is detected by the front or rear parking aid or park assist sensors.

A warning tone can also be emitted to alert the driver to a fault in the parking aid or park assist systems.

PARKING AID SWITCH

PARKING AID SWITCH

The parking aid switch is located in the left Touch Screen (TS) switchpack.

The parking aid switch is a non-latching push switch, which allows the driver to select the parking aid on or off.

When pressed, the switch momentarily connects to ground to the Parking Aid Control Module (PACM).

The Light Emitting Diode (LED) indicates when the parking aid system is active. The LED is controlled by the PACM.

PARK ASSIST SWITCH

PARK ASSIST SWITCH

The park assist switch is located in the left Touch Screen (TS) switchpack.

The park assist switch is a non-latching push switch.

Once pressed the park assist switch will turn the system on and parallel parking will be the first available option. Further presses of the switch will scroll the remaining options. The sequence is as follows:

  1. Parallel parking.
  2. Perpendicular parking.
  3. Parking exit.
  4. Park assist off.

The switch connects a ground to the Parking Aid Control Module (PACM).

The Light Emitting Diode (LED) indicates when the park assist system is active. The LED is controlled by the PACM.

REAR VIEW CAMERA (RVC)

REAR VIEW CAMERA (RVC)

Rear View Camera (RVC) Coverage Zone

Rear View Camera (RVC) Coverage Zone

  1. Rear View Camera (RVC)

The Rear View Camera (RVC) is located in the tailgate.

The RVC is a Video Graphics Array (VGA) resolution analogue camera that provides an image covering a zone approximately 130º wide by 112º deep and is capable of capturing approximately thirty frames per second. An electrical connector on the camera provides power, ground, Medium Speed (MS) Controller Area Network (CAN) comfort bus and Composite Video Baseband Signal (CVBS) connections. The CVBS connection is used for video image transmission between the camera and the Audio Head Unit (AHU) or Touch Screen (TS) depending on vehicle specification.

The camera provides additional information to the driver when reversing the vehicle. When reverse gear is selected the camera automatically displays a wide-angle colour image of the view from the rear of the vehicle on the AHU or TS. Overlay graphics are displayed by a combination of signals received on the MS CAN by the AHU or TS.

The positioning accuracy of the camera is crucial for successful operation, therefore care must be taken when installing a cameras to ensure it sits correctly in the bracket. In the event of camera replacement, a calibration routine must be performed.

CAMERA CONTROL MODULE (CCM)

CAMERA CONTROL MODULE (CCM)

The Camera Control Module (CCM) is located under the passenger front seat.

The connections to the CCM include:

  • Medium Speed (MS) Controller Area Network (CAN) comfort bus.
  • Four camera inputs.
  • Video signal to either a Audio Head Unit (AHU) or Touch Screen (TS) depending vehicle specification.
  • Power and supply.

The Camera Control Module (CCM) gathers the camera images and analyses and alters them by adjusting perspectives and applying corrections. The resulting processed images are then relayed to either a Audio Head Unit (AHU) or Touch Screen (TS) using a Composite Video Baseband Signal (CVBS).

The CCM also adds guidance and warning overlays to the camera images to create the various driving-aid features supported by the camera systems.

The CCM communicates with each individual camera using a Low-Voltage Differential Signal (LVDS). This data link transmits diagnostic information, for example camera serial numbers and fault notifications to the CCM. Camera adjustments, for instance a correction to colour-balance are also communicated via LVDS link to the camera.

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