N509U 12-02
© 2002 Directed Electronics, Inc.
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509U ultrasonic sensor control module with
mounting hardware
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Wiring interface harness
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2 ultrasonic transducers with mounting hardware
The 509U Ultrasonic sensor is used to provide coverage
of a vehicle’s interior cabin area. The sensors detect
movement inside the vehicle by sensing air distur-
bance. They should trigger the alarm if a thief has
gained access to the interior of your vehicle.
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the 509U can interface with the 4-pin MUX port of
all Directed security systems using the wiring
interface harness supplied.
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For other Directed (and non-Directed) security
systems that do not have sensor ports, the 509U
can be hard-wired to a negative instant trigger
sensor input.
Mounting the Control Module and Transducers.
1. Choose a location under the dashboard for the
control module that is close enough that the wire
harness can reach the alarm control module and the
transducers will reach the top of the A-pillar on both
driver and passenger sides.
2. One transducer is longer than the other, so mount
the transducer with the longest harness furthest from
the control module. Use the screws provided or insert
the mounting tabs between the dashboard and wind-
screen pillar.
3. Angle the sensors towards the top centre of the rear
window. If mounted at the top of the A-pillars make
sure the transducers position does not affect use of the
sunvisor.
4. Route the sensor cables to the 509U control module
and plug-in.
Adding a 509U to an alarm without a sensor port
To add a 509U to these types of alarm systems, refer to
the configuration diagram below and follow these
steps:
1. Plug the transducers into the 509U.
2. Cut off and discard the 3-wire, 4-pin connector
(with the red, black, and blue wires).
3. Connect the end of the cut blue wire that is still
connected to the 3-wire ultrasonic sensor harness
(with the blue, red, and black wires) to an instant
trigger sensor input of the alarm system.
4. Insert a 1-amp diode in series with the blue wire
with the band side facing towards the 509U control
unit (see wiring diagram).
5. Connect the end of the cut red wire that is still
connected to the 3-wire ultrasonic sensor harness
to a fused constant (+)12V source.
6. Connect the end of the cut black wire that is still
connected to the 3-wire ultrasonic sensor harness
to chassis ground.
7. Adjust and test the ultrasonic sensor before
mounting.
Installation Instructions
Product Description
What Is Included
509U Ultrasonic Sensor
