Workshop Manuals Factory service & repair Land Rover
01 Discovery Series II - Workshop Manual - 1999MY ON - 6th Edition - NAS02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 INTRODUCTION32 33 GENERAL INFORMATION34 35 GENERAL DATA36 IDENTIFICATION NUMBERS37 38 TORQUE WRENCH SETTINGS39 40 LIFTING AND TOWING41 CAPACITIES, FLUIDS, LUBRICANTS AND SEALANTS42 43 44 MAINTENANCE45 46 ENGINE - V847 48 EMISSION CONTROL - V849 50 ENGINE MANAGEMENT SYSTEM - V851 FUEL DELIVERY SYSTEM - V852 53 COOLING SYSTEM - V854 55 MANIFOLDS AND EXHAUST SYSTEMS - V856 57 58 59 CLUTCH - V860 61 MANUAL GEARBOX - R38062 63 TRANSFER BOX - LT230SE64 65 66 AUTOMATIC GEARBOX - ZF4HP22 - 2467 PROPELLER SHAFTS68 69 REAR AXLE70 71 72 73 74 75 FRONT AXLE76 77 78 79 STEERING80 FRONT SUSPENSION81 82 83 REAR SUSPENSION84 85 86 87 BRAKES88 RESTRAINT SYSTEMS89 90 DOORS91 EXTERIOR FITTINGS92 93 INTERIOR TRIM COMPONENTS94 SCREENS95 96 97 SEATS98 99 SUNROOF100 CHASSIS AND BODY DIMENSIONS101 102 103 104 PANEL REPAIRS105 106 107 108 BODY SEALING MATERIALS109 110 111 112 113 CORROSION PREVENTION AND SEALING114 PAINTING115 HEATING AND VENTILATION116 117 AIR CONDITIONING118 119 WIPERS AND WASHERS120 CHARGING AND STARTING121 122 LIGHTING123 BODY CONTROL UNIT124 125 126 ALARM SYSTEM AND HORN127 128 WINDOWS129 IN CAR ENTERTAINMENT130 HARNESSES131 DRIVING AIDS132 NAVIGATION SYSTEM133 INSTRUMENTS
Land Rover Discovery II131 · DRIVING AIDS
131 · General

DRIVING AIDS (Operation): DESCRIPTION AND OPERATION

Make
Land Rover
Model
Discovery II
Section
DESCRIPTION AND OPERATION › Operation
DRIVING AIDSOperation
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DRIVING AIDS

DESCRIPTION AND OPERATION 86-8-11

Operation

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 on vehicles with automatic 
transmission.

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.

PDC can also be manually selected when not in reverse gear by pressing the PDC switch. 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 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 450 mm (17 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.

Parts & tools for this job Staging For Land Rover Discovery

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