LR3/Disco 3
Diagnostics
The parking aid module has a diagnostic connection via the medium speed CAN to enable faults to be retrieved using T4.
Additionally, an on-board diagnostic routine within the parking aid module constantly monitors the system and alerts the
driver to a system fault by emitting a tone from the front or rear sounder, depending on the fault.
If a parking aid system fault has occurred, the parking aid module will relay the occurrence of the fault to the driver in the
following ways:
The status LED will flash at a frequency of 2Hz if the system is active and fault is detected in the sensors,
sounders, related wiring or the module.
The front sounder will emit an error tone for 3 seconds at a frequency of 1500Hz if a fault is detected with the front
sensors or the rear sounder develops a fault.
The rear sounder will emit an error tone for 3 seconds at a frequency of 1500Hz if a fault is detected with the rear
sensors, the switch, the LED in the switch or if there is a CAN bus error.
SENSORS
Four sensors are positioned in the rear bumper and the front bumper (if fitted). Each sensor housing has two raised
location keys which locate in corresponding grooves in the bumper mounting hole and sets the correct orientation for the
sensor bodies. The housings are clipped into the bumper from the front. The sensors are then clipped into the housings
from the rear.
Each sensor has a three pin connector which connects into a common harness linking all four sensors. This harness is
connected to the main vehicle body harness for the rear sensors or the engine compartment harness for the front
sensors. The three pins are for sensor negative and positive feeds and a signal line.
Each sensor comprises a plastic housing which contains a piezoelectric disc. The disc resonates at a frequency of 38.4
kHz, producing an ultrasonic signal output. The disc also receives the reflected echo signal.
Ambient temperature
HEVAC module
Engine running status
Diesel engine control module
Stored odometer reading
Instrument cluster
Vehicle voltage level
Instrument cluster
Minute counter
Instrument cluster
Car configuration
Instrument cluster
Diagnostic physical request
T4 via diagnostic socket
Diagnostic functional request
T4 via diagnostic socket
Master configuration identification
Instrument cluster
Item Part Number
Description
1
-
Front sensor housing
2
-
Front sensor
3
-
Rear sensor housing
4
-
Rear sensor
