Workshop Manuals Factory service & repair Land Rover
01 Freelander 2001 TO 2004MY Onwards Workshop Manual - System Description and Operation - 5th Edition - NAS02 03 04 05 06 07 08 ENGINE - K SERIES KV609 10 11 12 EMISSION CONTROL - K SERIES KV613 14 15 16 17 18 19 ENGINE MANAGEMENT SYSTEM - SIEMENS20 FUEL DELIVERY SYSTEM - K SERIES KV621 22 23 COOLING SYSTEM - K SERIES KV624 25 MANIFOLD AND EXHAUST SYSTEM - K SERIES KV626 27 INTERMEDIATE REDUCTION DRIVE28 AUTOMATIC GEARBOX - JATCO29 DRIVESHAFTS30 31 REAR AXLE AND FINAL DRIVE32 STEERING33 FRONT SUSPENSION34 35 REAR SUSPENSION36 37 BRAKES38 RESTRAINT SYSTEMS39 HEATING AND VENTILATION40 41 AIR CONDITIONING42 43 44 WIPERS AND WASHERS45 CONTROL UNITS46 47 COMMUNICATION DATA BUSES48 49 SECURITY50 51 52 WINDOWS53 54 55 DRIVING AIDS56 NAVIGATION SYSTEM57 58 INSTRUMENTS
Land Rover Freelander System Description and Operation55 · DRIVING AIDS
55 · General

Sensor Operation

Make
Land Rover
Model
Freelander System Description and Operation
Section
PDC System Operation › Sensor Operation
DRIVING AIDSSensor Operation
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DRIVING AIDS

DESCRIPTION AND OPERATION

86-2-7

PDC Sounder

The PDC sounder is controlled by the PDC ECU and emits a series of tones of varying frequency to inform the driver 
of the distance between the vehicle and a detected object.

The PDC sounder is located in the RH side of the rear luggage compartment. A bracket is attached to the 'E' post, 
behind the trim panel and provides for the attachment of the PDC sounder and the PDC ECU. The sounder is 
connected to the PDC ECU via a harness connector.

PDC System Operation
When the ignition switch is in position II and reverse gear is selected, the PDC sensors are automatically activated. 
The PDC ECU 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.

When the system is activated, the PDC ECU illuminates the indicator LED in the PDC switch, switches on the 
ultrasonic sensors and generates a single chime on the PDC sounder to indicate the system is active. If an object is 
range of the sensors when the system is activated, a series of audible warnings are emitted by the PDC sounder 
immediately.

If PDC operation is not required, it can be suspended temporarily by pressing the PDC switch. When reverse is 
deselected and subsequently reselected, PDC will automatically become active again.

A second press of the switch is required to turn off the PDC or the PDC will be deactivated if reverse is selected and 
then deselected.

Sensor Operation
The PDC ECU 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 PDC sounder.

The maximum detection range is 2000 mm (78.7 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 370 mm (14.5 in), the audible warning tone is continuous.

After the initial detection of an object, if there is no decrease in the distance between an object and the central sensors, 
the time delay between the audible warnings remains constant. If an object is detected by one of the corner sensors 
only, the audible warnings stop after about 5 seconds if there is no change in the distance between the object and the 
corner sensor.

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