LR3/Disco 3
The parking aid sounder is controlled by the parking aid module and emits a series of tones of varying frequency to inform
the driver of the distance between the vehicle and a detected object.
The rear parking aid sounder is located in the LH side of the luggage compartment, behind the side trim panel, below the
window. The sounder is secured with two, self tapping screws into the body. The sounder is connected to the parking aid
module via a harness connector.
The front parking aid uses the instrument cluster sounder and is activated by CAN messages from the parking aid module
to the instrument cluster.
PARKING AID OPERATION AND DISTANCE CALCULATION
On vehicles with rear only parking aid sensors, when the ignition switch is in position II and reverse gear is selected, the
parking aid sensors are automatically activated. The parking aid module only activates the system if reverse is selected
for more than 1 second. This avoids nuisance audible warnings when the gear selector lever is being moved between
Drive and Park on vehicles with automatic transmission.
When the rear system is activated, the parking aid module illuminates the indicator LED in the parking aid switch,
switches on the ultrasonic sensors and generates a single chime on the parking aid sounder to indicate the system is
active. If an object is in the range of the sensors when the system is activated, a series of audible warnings are emitted by
the parking aid sounder immediately.
If parking aid operation is not required, it can be suspended temporarily by pressing the parking aid switch. On vehicles
with rear only parking aid sensors, the system can be enabled again by pressing the switch again or switching the ignition
off then on. The parking aid will then automatically become active again in reverse gear. The system also remains on
when going from reverse gear to neutral. The assumption being that the driver may still want to manoeuvre the vehicle
going backwards in neutral.
The parking aid module receives a signal on the CAN from the central junction box when a trailer is fitted. When this
signal is detected, the parking aid module suspends operation of the rear parking aid sensors.
On vehicles with front and rear systems, the front system is activated when the ignition switch is in position II, the vehicle
is out of Park and the Electric Park Brake (EPB) is off. If the vehicle speed subsequently goes above approximately 10
mph (16 km/h), the front system will switch off. When the speed drops below approximately 6 mph (16 km/h), the front
system activates again. If the EPB is applied or Park is selected, the Parking Aid system is deactivated.
Sensor Operation
The parking aid module processes the distance readings from the ultrasonic sensors to determine if there are any objects
within the detection areas. If there are no objects in the detection areas, there are no further audible warnings. If an object
is detected, repeated audible warnings are produced on the parking aid sounder.
The maximum detection range is 1800 mm (70 in). When an object is detected, the time delay between the audible
warning tones decreases as the distance between the detected object and the vehicle decreases until, at approximately
