Directed Electronics 509U Installation Instructions page 2

Ultrasonic Sensor Adjustment and Testing
1. The sensitivity adjuster is found on the top of the
509U control module. Insert a small screwdriver
into the adjustment hole and turn the screw clock-
wise to increase sensitivity or counterclockwise to
decrease sensitivity.
2. Arm the alarm system, wait a few seconds and then
move your arm through an open window on the
vehicle as if attempting to remove an item from
the seat.
The LED should illuminate on the control module to
provide visual indication it has detected the move-
ment and the alarm system should trigger.
If it does not, then increase the sensitivity in small
increments until the optimum position is reached
© 2002 Directed Electronics, Inc.
and the sensors do pick up the movement. Do not
over adjust the sensors as the system will false
alarm. The sensitivity level should be left at the
minimum setting where the sensors pick up move-
ment in the rear seating position.
3. When satisfied with the final sensitivity setting,
mount the 509U control module securely with the
double-sided tape and cable tie provided.
Wiring Description
Red (+) 12V Constant: Connect this wire to a fused
(+) 12V constant power source.
Black (-) Chassis Ground: Connect this wire to chassis
ground of the vehicle.
Blue (-) Trigger Output: Connect this wire to the
instant trigger input of the vehicle security system.
ULTRASONIC
TRANSDUCER
ULTRASONIC
TRANSDUCER
ALARM SYSTEM
N509U 12-02