Range Rover Driving Aids System: General Operation
DRIVING AIDS
86-10-6 DESCRIPTION AND OPERATION
Operation
General
When the ignition switch is in position II and either reverse gear is selected or the parking switch is pressed, both sets
of acoustic sensors are activated. The PDC ECU only activates the system if reverse is selected for more than 1
second, to avoid nuisance audible warnings when the gear selector lever is being moved between Drive and Park.
The rear sensors are disabled when a trailer is connected to the vehicle.
Park Distance Control Detection Areas
A = Intermittent warning tone; B = Continuous warning tone
When it activates the system, the PDC ECU illuminates the indicator LED in the parking switch, switches on the
ultrasonic sensors and generates a single chime on the PDC sounder and the instrument pack sounder to indicate
the system is active. The PDC ECU then 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 or the instrument pack sounder as appropriate. The time delay
between the audible warning tones decreases as the distance between the detected object and the vehicle decreases
until, at approximately 250 mm (10 in), the audible warning tone is continuous.
After the initial detection of an object, if there is no decrease in the distance between the object and the vehicle:
l
If the object is detected by one of the central acoustic sensors the time delay between audible warning tones
remains constant
l
If the object is detected by a corner transducer the audible warning tones stop after approximately 3 seconds.
The audible warning tones are discontinued when the gearbox selector lever is moved out of reverse, but will restart
if the PDC ECU detects a decrease in the distance between the vehicle and an object.
System operation is cancelled when the parking switch is pressed or the ignition is switched off. System operation is
also cancelled if the vehicle travels more than 50 m (164 ft) or forward speed exceeds 19 mph (30 km/h).
700mm (27.5in)
250mm (10in)
600mm (23.5in)
'Y'
'Y'
1500mm (59in)
250mm (10in)
'Y'-'Y'
M86 5805
A
B
600mm (23.5in)
'X'-'X'
'X'
'X'