Location of elements of the parking assistance system
Item name | Spare part number | Description |
1 | - | Front sensors |
2 | - | Parking assistance speaker |
3 | - | 3 rear sensors |
4 | - | Parking assistance module |
5 | - | Parking Assist Switch |
Review
The parking assistance system informs the driver with an audible warning of an obstacle in the vehicle's path when parking in a forward direction (if the package includes) or in reverse. The purpose of the system is to assist the driver when parking the car in a confined space. The system is not a means of avoiding a collision when driving in traffic and does not relieve the driver of the need for visual orientation.
The parking assistance system is not a standard equipment item on all vehicles. Some vehicles may only be equipped with rear sensors, and vehicles with higher trim levels may be equipped with both front and rear sensors.
The system consists of four sensors in the rear bumper and four sensors in the front bumper (if included in the package), control module, control panel switch, speaker for rear system and speaker for front system (built into the instrument panel).
The system is based on the principle of ultrasonic echolocation. The received reflected audio signal is used by the system control module to calculate the distance to the obstacle.
A switch mounted on the dashboard allows the driver to turn off the parking assistance system if its services are not needed.
Parking Assist Control Module
The parking assist control module is located on the right side of the luggage compartment, behind the side trim panel.
The parking assistance control module uses a single microprocessor to perform the following tasks:
- Control of ultrasonic sensors
- Control of ultrasonic sensors
- Evaluation of received reflected signals coming from sensors
- Interference suppression
- Parking assistance speaker control
- Speaker and wire monitoring
- Switch and wire status indicator control and monitoring
- Evaluation of input control signals and monitoring them
- Management of diagnostic and test functions
- Power chain monitoring
- Transfer of information using the diagnostic line
Parking assistance connector pins
Item name | Spare part number | Description |
A | - | Connector C0957 |
B | - | Connector C1457 (Only front sensors) |
C | - | Connector C0958 (Rear sensors only) |
Connector C0957
contact number. | Description | Input signal / output signal |
1 | Power circuit from the ignition switch | Input signal |
2 | Rear system speaker | Output signal |
3 | Not used | - |
4 | Switch («weight») | Input signal |
5 and 6 | Not used | - |
7 | CAN low | Input signal / output signal |
8 and 9 | Not used | - |
10 | Rear speaker power circuit, 12V | Input signal |
11 and 12 | Not used | - |
13 | Switch LED | Output signal |
14 | CAN high | Input signal / output signal |
15 | Not used | - |
16 | Weight | Input signal |
Connector C01457
contact number. | Description | Input signal / output signal |
1 | 3 front sensors ground | Input signal |
2 | Power for front sensors, 12 V | Output signal |
3 and 4 | Not used | - |
5 | Left outermost front sensor signal | Input signal |
6 | Left inner front sensor signal | Input signal |
7 | Right inner front sensor signal | Input signal |
8 | Right outermost front sensor signal | Input signal |
9 to 12 | Not used | - |
Connector C0958
contact number. | Description | Input signal / output signal |
1 | Not used | - |
2 | Right inner rear sensor signal | Input signal |
3 | Left inner rear sensor signal | Input signal |
4 | Right rear sensor signal | Input signal |
5 | Left outermost rear sensor signal | Input signal |
6 and 7 | Not used | - |
8 | Rear sensor ground | Input signal |
9 and 10 | Not used | - |
11 | Power for rear sensors, 12 V | Output signal |
12 | Not used | - |
Input and output signals
Communication between the control module and external elements of the parking assistance system is carried out through three connectors for vehicles with front and rear sensors, or through two connectors for vehicles with rear sensors only.
The control module receives input signals from the following elements:
- Reverse gear engaged - CAN·message from the automatic transmission control module or, for vehicles with a manual transmission, from the transfer case control module.
- Forward gear engaged (except «neutral» and reverse) - CAN·message from the automatic transmission control module or, for vehicles with a manual transmission, from the transfer case control module.
- Parking Assist Switch
- Parking brake applied - CAN·message
- Trailer connected - CAN·message for central electrical box (CJB):
- Powered by ignition switch
- Sensors - power and ground connections
- Sensors, digital signal: transmission (obstruction irradiation) and reception (reflected signal)
- Rear system speaker: variable frequency output
- Front system speaker: CAN·message to instrument cluster
- Parking assistance switch: LED supply voltages in the switch
CAN bus signals
The parking assistance control module receives and sends a series of digital signals over the medium speed CAN bus. The received signals are used to control the operation of the parking assistance system.
The messages received by the parking assistance system module and used to control the system are summarized in the table below.
Message | Sender |
Vehicle speed | ABS module |
Selector position: Automatic transmission | transmission control module |
Gear Selected: Manual | Transfer case control module |
Activating/deactivating the electronic parking brake | Electronic parking brake module |
Vehicle status (in motion or not) | ABS module |
Trailer connection | Central electrical box |
Outdoor temperature | Automatic temperature control module (ATC) |
Engine running status | Diesel engine control unit |
Stored odometer reading | Dashboard |
Vehicle voltage level | Dashboard |
Timer | Dashboard |
Vehicle configuration | Dashboard |
Physical Diagnostic Query | Land Rover Approved Diagnostic System via Diagnostic Connector |
Functional Diagnostic Request | Land Rover Approved Diagnostic System via Diagnostic Connector |
System Configuration Identification | Dashboard |
Diagnostics
The parking assistance control module is connected to the diagnostic connector on the medium speed CAN bus, so faults can be diagnosed using the T4 tool. In addition, the control module performs self-diagnosis, which constantly monitors the system and, in the event of a malfunction, alerts the driver with an audible signal from the speaker of the front or rear system (depending on the nature of the fault).
If a malfunction is detected in the parking assistance system, the control module informs the driver about it as follows:
- If the system is active and there is a problem with the sensors, speakers, control module, or wiring, the system LED flashes at a rate of 2 Hz.
- If a malfunction is detected in the front sensors or the rear system speaker, an error tone at 1500 Hz is emitted from the front system speaker for three seconds.
- If a malfunction of the rear sensors, the switch integrated in the LED switch is detected, and also in the event of a signaling error on the cAn bus, an error signal with a frequency of 1500 Hz is emitted from the rear system speaker for three seconds.
Sensors
Item name | Spare part number | Description |
1 | - | Front sensor housing |
2 | - | front sensor |
3 | - | Rear sensor housing |
4 | - | Rear sensor |
In the back and in the front (if included in the package) There are four sensors on the bumper. There are two lugs on each sensor housing to secure it in the correct position in the bumper hole. The sensor housing is inserted into the front bumper. After that, the sensor itself is inserted into the housing from behind and fixed in it.
Each sensor has a three-pin connector that is connected to a common harness for all four sensors. Then the rear sensors wiring harness is connected to the common body wiring harness, and the front sensors wiring harness is connected to the engine compartment wiring harness. The three sensor contacts are designed to be connected to «mass», supply voltage and for signal transmission.
Each sensor contains a piezoelectric disk in the plastic housing. The disk vibrates at a frequency of 38.4 kHz, generating an ultrasonic signal in the air. The disk also receives the reflected signal as well.
The parking assistance control module controls each sensor by sending digital signals to it via a signal line. Each sensor has two modes of operation; combined transmitter and receiver mode and receiver only mode.
In combined mode, the sensor emits a series of ultrasonic pulses and then switches to the mode of receiving sound reflected from an obstacle at a detection distance. The reflected signals are amplified and converted from an analog signal to a digital signal in the sensor. The digital signal is sent to the parking assistance control module, where it is compared with pre-programmed samples stored in the EEPROM memory. The control module receives this data from the sensor via the signal transmission line and calculates the distance to the obstacle from the time interval between the exposure of the obstacle and the reception of the reflected signal. The transmission pulse duration is set by the control module. The pulse repetition frequency is determined by the sensor.
In receiver mode, the sensor receives pulses emitted by neighboring sensors. The control module uses this information to accurately determine the position and distance to the obstacle.
Parking Assist Switch
Item name | Spare part number | Description |
1 | - | Switch |
2 | - | Light-emitting diode |
The park assist switch is located on the center console above the integrated head unit, to the left of the hazard warning switch. An LED is built into the switch, the positions of which are not fixed. To turn on the LED, a voltage of 12 V is applied to the switch. The switch is connected to «weight». When the switch button is pressed, a short circuit occurs on «mass», which is interpreted by the parking assistance system as a command to turn the system on or off.
Parking assistance speaker
The parking aid speaker is controlled by the control module and generates beeps of various frequencies to inform the driver of the distance between the vehicle and an obstacle.
The rear park assist speaker is located on the left side of the luggage compartment, behind the side trim panel, below the window level. The speaker is attached to the body with two self-tapping screws. The speaker is connected to the parking assistance system control module by a wiring harness with a connector.
The front parking assistance system uses a speaker built into the instrument cluster, which is controlled by CAN bus commands from the parking assistance control module to the instrument cluster.
Control scheme
NOTE: A = wired connection; D = high speed CAN bus; N = Medium speed CAN bus
Item name | Spare part number | Description |
1 | - | Fuse link 11E (30A) |
2 | - | ignition switch |
3 | - | Fuse 36P (5A) |
4 | - | Rear park assist speaker |
5 | - | Parking assistance module |
6 | ATC module | |
7 | - | Central distribution block (CJB) |
8 | - | Dashboard |
9 | - | ABS module |
10 | - | transmission control module |
11 | - | Transfer case control module |
12 | - | Electronic parking brake module |
13 | - | Engine control module |
14 | - | Left extreme front sensor |
15 | - | Left inner front sensor |
16 | - | Right inner front sensor |
17 | - | Right extreme front sensor |
18 | - | Left extreme rear sensor |
19 | - | Left inner rear sensor |
20 | - | Right inner rear sensor |
21 | - | Left extreme rear sensor |
22 | - | Parking Assist Switch |
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