HY Technologies C-2682-04 User manual

User’s Manual
Backup Parking Sensor System
Wireless Digital Display with Built-in Audible Alert
4 Rear Heavy-Duty Under-Bumper Type Sensors
Waterproof Main Control Box
For Buses, RV's, Commercial Trucks, and Long Vehicles
MODEL C-2682-04
CE ISO9001
HY Technologies yhttp://parkingsensors.net yhttp://parking-sensors.hyt.com
Copyright 82006 HY Technologies yMilpitas yCalifornia yUSA All Rights Reserved

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Backup Parking Sensor System
Wireless Digital Display with Built-in Audible Alert
For Buses, RV's, Commercial Trucks, and Long Vehicles
MODEL C-2682-04
Included in the Box
¾4x Black Sensors with bracket, attached cable
and BNC type connector. Cable Length: 26ft (8m)
¾1x Main Control Box with double-sided
self-adhesive and Velcro attachment. Two screw
holes on each side of the box
¾1x Wireless Digital Distance Display with
adjustable and removable bracket with
double-sided self-adhesive on bottom of the
bracket base
¾1x Power Cable for Wireless Digital Distance
Display with 3-pin mini plug. 5ft (1.5m) long
¾1x Power Cable for Main Control Box with BNC
type connector. 5ft (1.5m) long
¾10x 1-1/4" screws with nuts for mounting the
sensors and Main Control Box
¾1x User’s Manual
Features
¾Wide Working Voltage Range (DC 12-24V)
¾System works when vehicle is in reverse.
¾4 Under-Bumper Heavy Duty Sensors with bracket
for easy under-bumper installation
¾Waterproof Main Control Box for easy
under-vehicle installation
¾Wireless Digital Distance Display with built-in
audible alert, volume control (Off/Low/High), and
adjustable/removable bracket
¾All Connectors - Waterproof BNC type
¾Distance Display in feet or meters
¾3 LED Lights (Green/Yellow/Red) on each side of
distance display indicating orientation of obstacles
and Safe/Warning/Stop zone.
¾Specially designed for long vehicles such as Buses,
Recreational Vehicles, and Commercial Trucks.
¾12 Month Warranty
Specifications
¾CE and ISO9001 Approved
¾Wireless Display RF Range: 65ft (20m)
¾Operating Voltage: DC 12V ~ 24V
¾Detecting Range: 1.0 ~ 8.2ft (0.3m ~ 2.5m)
Displayed as 0.0 when less than 1ft (0.3m)
¾Measuring Error: ±0.3ft (0.1m)
¾Sensor Detection Angle: 90°
¾Detection Response Time: 300ms
¾Audible Alert when obstacle within: 1.0~8.2ft (0.3m
~ 2.5m)
¾Distance Display: in feet or meters
¾Ultrasonic Frequency: 40Khz
¾RF Frequency: 433KHz
¾Audible Alert Volume: 60 db
¾Maximum Power Consumption: 4W
¾Current Consumption: 100~300mA
¾Operating Temperature Range: -30 ~ +70°C
¾Sensor Cable Length: 26ft (8m)
¾Power Cable for Wireless Display: 5ft (1.5m)
¾Power Cable for Main Control Box: 5ft (1.5m)
¾Dimensions of the Wireless Display without Bracket:
Width x Depth x Height = 3" x 3.1" x 1.2" (7.6cm x
7.9cm x 3.0cm)
¾Height of Display Bracket: 0.75" (1.9cm) Bracket
adjustable/removable from the display
¾Dimensions of the Main Control Box: Width x Depth x
Height = 4.0" x 4.3" x 1.1" (10.2cm x 10.9cm x
2.7cm)
Note: The specifications are for reference only. They may be changed without prior notice.
Tools Needed
1/8”drill bit, drill, tape measure, chalk or marker, wire stripper, vinyl electrical tape, cable/wire ties, voltage meter,
screw driver set, pliers

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How the System Works
The Backup Parking Sensor System determines obstacle distance by measuring the time needed for the
ultrasonic wave emitted by a sensor to reach an obstacle and for the sensor to receive the ultrasonic wave
reflected from the obstacle. Given the speed of the ultrasonic wave, the system can then calculate and display
the distance between the sensor and the obstacle.
The main control box and the wireless display get their power by tapping into the back up light wires so that the
system will work only when vehicle is put in reverse. It is supplied with a wireless digital distance display which
shows the exact distance from an obstacle and eliminates the wiring between the display and main control box.
This is especially convenient for installation on long vehicles. Three (3) LED Lights (Green/Yellow/Red) on
each side of the wireless distance display indicate both orientation of obstacles and Safe/Warning/Stop zone. 
The audible alert (beeper) is built in the wireless display with volume control (Off/Low/High). It beeps faster as
vehicle gets closer to obstacle and sounds continuously when vehicle is within 1ft (0.3m) from the obstacle.
Sensors
ABCD
Red
Black
Back Up Light
Fig. 2 Main Control Box and Wiring
+12V ~ 24V from
Reverse Gear or
Ignition Switch
Chassis Ground
+
-
Red
Black
(+) 12V ~ 24V
( - ) or Chassis Ground
Power Plug
Ground
H
L1 L2 L3 L4 L1
Fig.1 Mounting Height and Position of Sensors
H = 20” ~ 32” (50 ~ 80cm)
L1 = 2” ~ 6” (6 ~ 15cm)
L2 = L3 = L4 or L2 = L4 = 0.3L, L3 = 0.4L
L
A
BC
D
0.5
Fig. 3 Wireless Display (Front View)
Green
Yellow
Red
2 1 0
Fig.4 Wireless Display (Side View)
Beeper Volume Switch
2/1/0 = High/Low/Off
Fig. 5 Wireless Display (Bottom View)
Wireless ID Code
Setting Button
ABCD
POWER
Antenna (wire)

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Installation and Wiring
IMPORTANT: (a) Read this manual thoroughly before proceeding to installation. You can also have the system
installed by a professional installer such as your local auto mechanic/auto electrician/car stereo store. (b) Turn off
the engine and ACC during installation. (c) Double check that the wiring is correct before power on the system. (d)
During installation, avoid flatting, perforating, cutting, and extending the wires of sensors to reduce unnecessary
signal loss.
1. Installation of the Main Control Box
a) Find a flat and clean surface inside the vehicle or underneath the vehicle close to the driver's side taillight
assembly as the waterproof main control box gets its power from the back up light and has all the rear
sensors plugged into it. Keep it away from areas of high heat, high humidity, direct water contact, direct
sunlight, and electromagnetic devices.
b) Place the main control box in place temporarily without securing it to the vehicle as you may need to adjust
the location of the main control box slightly while wiring.
c) After completing all wiring, use the 2 screws included to secure the main control box to the vehicle. You will
need to drill two 1/8”holes through the mounting surface corresponding to the two screw holes on each side
of the main control box.
2. Installation of the Wireless Digital Distance Display
a) Find a place for the wireless digital distance display on top of the dashboard where the driver can see it
easily. Place the wireless display in place temporarily without securing it to the top of the dashboard.
b) After completing all wiring, secure it with the included self-adhesive on bottom of the display bracket.
3. Wiring - Power Supply to the Wireless Digital Distance Display
a) Insert the 3-pin mini plug of the power cable of the Wireless Display into its socket on back of the display.
b) Locate the +12V (or +24V) and the (-) negative wires from the reverse gear for the back up lights under the
dashboard or near the reverse gear.
c) Strip 1/2" of the wires found.
d) Connect the red wire of the power cable to the +12V (or +24V) wire (Fig. 4).
e) Connect the black wire of the power cable to the (-) negative or chassis ground (Fig. 4).
f) Wrap the connections with vinyl electrical tape.
Note: You can also connect the red wire to the ignition switch or ACC. But connecting it to the reverse gear or
back up light is better as the display only needs to work when the vehicle is put in reverse.
4. Wiring - Power Supply to the Main Control Box
a) Plug the BNC type connector of the power cable of the Main Control Box into its socket on the left side of the
main control box labeled POWER.
b) Locate the +12V (or +24V) and the (-) negative wires from the back up light near the taillight assembly. If
necessary, remove the taillight assembly to locate them.
c) Strip 1/2" of the wires found.
d) Connect the red wire of the power cable to the +12V (or +24V) wire (Fig. 2).
e) Connect the black wire of the power cable to the (-) negative or chassis ground (Fig. 2).
f) Wrap the connections with vinyl electrical tape.
5. Installation of the Sensors
IMPORTANT: (a) To avoid false alert from the system detecting the ground, the sensors should be mounted
between 20" to 32" (50cm to 80cm) above the ground and the face of the sensors need to be vertical or slightly
upward angled. (b) Horizontally, the sensors should be equally spaced if possible or symmetric to the center of
the bumper. (c) The outer two sensors should be mounted about 5.9" (15cm) from the corner of the bumper for
better corner coverage.
a) Refer to Fig. 1 for mounting height and position of the sensors.
b) The four (4) sensors supplied with this system are under bumper type (each sensor is pre-fitted in a sensor
bracket with two screw holes for easy under bumper installation). Under the bumper, with chalk or marker,
mark the position of sensors, then the two screw holes corresponding to the two screw holes on each sensor

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bracket. Use a 1/8”drill bit to drill the holes at the marks.
c) Secure the sensor brackets underneath the bumper with the screws included.
d) Run the sensor wires to the main control box. Do not cut the sensors wires. Attach sensor wires to the
vehicle body with cable/wire ties so that they will not get in the way of any moving parts and there are no
loose wires hanging down.
e) Plug one sensor at a time into its corresponding socket at the main control box, start the engine and put the
vehicle in reverse, put a flat board as an obstacle in front of the sensor, the display should show the correct
obstacle distance, repeat the procedure for the remaining sensors. Note: When you shift into reverse, the
system may beep once indicating it is activated.
Note: For some vehicles, you may find it is easier to install the sensors to a metal bar first, and then secure the
metal bar underneath the bumper.
Testing Your New Backup Parking Sensor System
Back your vehicle slowly (about 3 mile/hour) to approximately 8.2 feet (2.5m) from a flat vertical surface such as a
wall. Continue to back up slowly and check the performance against Chart 1.
Using the Wireless Digital Distance Display
A. Understanding the Display
(a) There are three (3) LED Lights (Green/Yellow/Red) on each side of the two-digit distance display (Fig. 3). The
color LED lights have two functions: indicating the orientation of obstacle and showing if you are in
Safe/Warning/Stop zone. See Chart. 1 below for details.
Chart 1. Orientation of Obstacle, Digital Distance Display, and Beeping (Audible Alert)
Viewing from the Front of the Display
Obstacle Distance LEDs on the Left Side
of the Display
Responding to Sensor D or C Beeping Digital
Distance
Display
LEDs on the Right Side
of the Display
Responding to Sensor B or A
Safe Zone
( > 8ft or 2.5m ) No LEDs on No -.- No LEDs on
Safe Zone
( 8~3ft or
2.5~0.9m )
Green on Starting to
beep at 8ft
or 2.5m
Actual
distance Green on
Warning Zone
( 3~2ft or
0.9~0.6m )
Yellow/Green on Faster Actual
distance Yellow/Green on
Warning Zone
( 2~1ft or
0.6~0.3m )
Yellow/Green on Fastest
Actual distance Yellow/Green on
Stop Zone
( 1~0ft or 0.3~0m) Red/Yellow/Green on & flashing Continuous
0.0 Red/Yellow/Green on & flashing
(b) The display has a built-in beeper (audible alert) with volume switch (High/Low/off) on the left side of the
display (Fig. 4) and an ID code setting button on the bottom of the display (Fig. 5).
B. Setting the ID code of the Display
Note: The ID code of the display has already been set in the factory. You only need to reset it if you find the
display can not work properly or communicate with the main control box.
Each main control box of the wireless system has its own ID code, and the display is set to only recognize the ID
code from its own main control box. If the display doesn’t work properly with the main control box, the ID code

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needs to be reset as follow:
ÖPower on the main control box. Make sure no other main control boxes are working nearby.
ÖPower on the display, press the wireless ID code setting button on the bottom of the display with a small flat
head screw driver until you hear one beep followed by two beeps indicating the display is set successfully.
Warning
zTo avoid collision with obstacle because of the inertia of vehicle while backing up/parking, keep your vehicle
speed at about 3 miles per hour and stop the vehicle immediately once you hear the continuous beeping.
This is because even if the brake is applied, your vehicle will still go for some distance (inertia) before it comes
to a complete stop.
zBecause the back up parking system detects obstacle by emitting ultrasonic wave and receiving reflected
ultrasonic wave from obstacle, the system may fail to give both visual and audible alert if an obstacle has
smooth ball-shaped or sloped surfaces as such surfaces may not reflect ultrasonic wave back to the sensors.
Obstacle surfaces absorbing ultrasonic wave such as human body and clothes will reduce the detection
distance of the system. Drivers in these situations should pay more attention while parking their vehicles.
zIn heavy falling rain or snow, the system may give alert as falling rain or snow may be detected as obstacles.
Keep surface of sensors clean of snow, mud, dirt, and other debris.
Troubleshooting
Problem Cause Solution
Display doesn't light up
when reversing No power to the display.
No power to the main
control box.
Incorrect wireless ID code
of the display.
Faulty display.
Check display power connection.
Check main control box power connection.
Reset the wireless ID code of the display.
Replace the display.
Display light up but system
is not detecting any obstacle Sensors not connected.
Faulty display.
Faulty main control box.
Check sensor connection.
Replace the display.
Replace the main control box.
System showing distance
but no beeping or beeping
but no distance display
Beeper switched off.
Faulty display.
Faulty main control box.
Switch on the beeper.
Replace the display.
Replace the main control box.
Wrong LEDs light up Sensors are plugged into
the wrong sockets at the
main control box
Install the sensors under the bumper as labeled
in Fig. 1 and plug sensors as labeled on the
sensor wires into their corresponding sockets at
the main control box
Display constantly shows
0.0 or beeps continuously Object within 1ft (0.30m) is
detected.
Faulty sensors.
Unplug all sensors, and then plug back in one
sensor at a time to find out which sensor is
causing the problem. Adjust position or angle of
the sensor. Refer to 5. Installation of the
Sensors for details.
Display shows a distance
and beeps even there is no
obstacle behind
Ground is detected.
Sensor is angled too low.
Sensors are installed too
low (mounting height
below 1.6ft or 0.5m)
Unplug all sensors, and then plug back in one
sensor at a time to find out which sensor is
causing the problem. Adjust position or angle of
the sensor. Refer to 5. Installation of the
Sensors for details.

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For more installation related questions and Frequently Asked Questions (FAQs) with answers, and
product photos, visit our Web site at http://parkingsensors.net or http://parking-sensors.hyt.com
IMPORTANT
The Parking Sensor Systems sold and distributed by HY Technologies are only a device used to assist a driver
while parking. They should not be considered as a substitute for driver responsibility when operating a vehicle.
No warranty as to operational efficiency is granted. We don't guarantee or assume liability for collisions or
damages that take place when parking your vehicle with the use of the Parking Sensor System. We will not be
liable for any claims, actions, suit proceedings, costs, expenses, damages or liabilities arising out of the use of
this product. By purchasing, installing and using such a Parking Sensor System, customers agree to take full
responsibility of use of such System.
HY Technologies yhttp://parkingsensors.net yhttp://parking-sensors.hyt.com
Copyright 82006 HY Technologies yMilpitas yCalifornia yUSA All Rights Reserved