LR3/Disco 3
The parking aid module controls the operating mode of each sensor by the output of a digital signal on the signal line.
Each sensor has two modes of operation; combined transmitter and receiver mode or receiver mode only.
In the combined mode, the sensor emits a series of ultrasonic impulses and then switches to receiver mode to receive the
echo reflected by an obstacle in the detection range. These echo signals are amplified and converted from an analogue
signal to a digital signal by the sensor. The digital signal is then transmitted to the parking aid module and compared with
preprogrammed data stored in an EEPROM within the module. The module receives this data via the signal line from the
sensor and calculates the distance to the obstacle according to the elapsed time between the transmitted and received
impulse. The duration of the impulse transmission is determined by the module. The frequency of the impulse is
determined by the sensor.
In the receiver mode, the sensor will receive impulses that were emitted by adjacent sensors. The module uses this
information to precisely determine position and distance of the obstacle.
PARKING AID SWITCH
The parking aid switch is located in the centre console, above the integrated head unit, to the left of the hazard warning
flasher switch. The switch is a non-latching switch with an integral LED. The switch receives a 12V output to drive the
LED when required. The switch is also connected to ground. When the switch is operated, the momentary completion of
the ground is interpreted by the parking aid module as a signal to enable or disable the parking aid system.
PARKING AID SOUNDER
Item Part Number Description
1
-
Switch
2
-
LED
