3M Opticom User manual

Installation Instructions
February 2005
Opticom?
GPS Priority Control System
Vehicle Equipment

Vehicle Equipment Installation Instructions i
Table of Contents
About This Manual.......................................................................................................................................1
1.1 Purpose of Manual...........................................................................................................................1
1.2 Manual Conventions.........................................................................................................................1
1.3 Related Publications..........................................................................................................................1
1.4 Manual Organization.........................................................................................................................1
2Safety Information.................................................................................................................................2
2.1 Intended Use....................................................................................................................................2
2.2 Technical Support ............................................................................................................................2
2.3 Safety Messages and Safety Labels....................................................................................................2
2.3.1 Safety Message Format.................................................................................................................2
2.3.2 Safety Label Format .....................................................................................................................3
2.4 Safety Messages Contained in this Manual..........................................................................................4
2.5 Label Locations................................................................................................................................6
2.6 Safety Considerations .......................................................................................................................7
2.6.1 Personal Safety Equipment and Clothing.........................................................................................7
2.6.2 Electric Shock..............................................................................................................................7
2.6.3 Explosion.....................................................................................................................................7
2.6.4 Chemical Burns............................................................................................................................7
2.7 Disposal of Device............................................................................................................................7
2.8 FCC Statement.................................................................................................................................7
3Description.............................................................................................................................................8
3.1 Opticom™ GPS System...................................................................................................................8
3.2 Vehicle Equipment............................................................................................................................9
4Features................................................................................................................................................10
5Installation...........................................................................................................................................11
5.1 Vehicle Radio/GPS Unit Installation.................................................................................................11
5.2 Vehicle Radio/GPS antenna installation.............................................................................................13
5.3 Radio/GPS Unit Cable Terminations................................................................................................14
5.4 Vehicle Control Unit Installation.......................................................................................................15
5.4.1 Low Priority...............................................................................................................................18
6Checkout..............................................................................................................................................19
6.1 Configuration Setup and Checkout...................................................................................................19
6.2 Input Verification............................................................................................................................19
6.3 Performance Tests .........................................................................................................................19
7Troubleshooting...................................................................................................................................21
8Maintenance.........................................................................................................................................25
4

Vehicle Equipment Installation Instructions 1
About This Manual
1.1 Purpose of Manual
This manual provides step-by-step instructions for
installing the 3M™ Opticom™ GPS Priority Control
System* vehicle equipment. It is intended for use by
installers, maintenance personnel, and others who are
responsible for the installation and maintenance of the
system.
1.2 Manual Conventions
The conventions listed in Table 1-1help to make
this manual easier to use by presenting a uniform
approach to the descriptions, phrases, and
nomenclature.
1.3 Related Publications
3M™ Opticom™ GPS Priority Control System
Intersection Equipment Installation Instructions.
3M™ Opticom™ GPS Priority Control System
Operation Manual.
1.4 Manual Organization
This manual is divided into eight sections.
Section 1. About This Manual
Contains information about the organization and
content of this manual.
Section 2. Safety Information
Contains important information about the safety
messages, safety labels, safety precautions, and
procedures for installation of this device.
Section 3. Description
Briefly describes the vehicle equipment and related
system components.
Section 4. Features
Describes important features and characteristics of
the vehicle equipment.
Section 5. Installation
Contains step-by-step installation instructions.
Section 6. Checkout
Contains information on how to check out and test
the installed system.
Section 7. Troubleshooting
Contains problem solutions to troubleshoot the
installed system.
Section 8. Maintenance
Contains information and recommendations to ensure
reliable system operation.
Table 1-1. Manual Conventions
Element Convention Example
Names First or formal reference: initial caps 3M™ Opticom™ GPS Priority Control
System Vehicle Radio/GPS Unit
Subsequent use or informal reference:
lowercase radio/GPS unit
Feature names Initial caps the Disable feature
Switch position Uppercase the OFF position
*The method of using the components of the Opticom?GPS system may be covered by one or more US Patent
Number 5539398, 5926113, 5986575, 6243026.

2Vehicle Equipment Installation Instructions
2 Safety Information
We provide important safety information and
warnings to assist you in understanding and
avoiding potential harm to yourself, and possible
damage to equipment, during the installation of
3M™ Opticom™ GPS Priority Control System
equipment. Although we have included many
potential hazards you may encounter during the
installation of this equipment, we cannot predict all
of the possible hazards and this list should not be a
substitute for your judgment and experience.
Please read, understand, and follow all safety
information contained in these instructions
before installing the system equipment. Save this
installation manual and keep it near the
equipment.
If you are unsure about any part of this installation
or of the potential hazards discussed, please contact
your supervisor immediately.
2.1 Intended Use
The system is intended to assist authorized priority
vehicles through signalized intersections by providing
temporary right-of-way through vehicle operator
interface to the system and through the use of common
traffic controller functions. 3M has not evaluated this
product for use in any other application.
2.2 Technical Support
If you have questions about the system, its use, or
operation, please contact your dealer or call the 3M
Intelligent Transportation Systems Technical
Service department at 1-800-258-4610.
2.3 Safety Messages and Safety Labels
We include safety messages and safety labels in this
manual to help you protect your safety and the
safety of others. This section contains important
information to help you recognize and understand
these safety messages.
Please read all messages before proceeding with the
installation.
2.3.1 Safety Message Format
Safety messages are designed to alert you to potential
hazards that can cause personal injury to you or
others. They can also indicate the possibility of
property damage.
Each safety message box contains a safety alert symbol
(); one of three signal words: WARNING,
CAUTION, or IMPORTANT NOTE; and a safety
message.
The signal words and symbols, and their meanings, are
shown below:
WARNING
The safety message is in this box.
WARNING indicates a potentially hazardous
situation, which, if not avoided, could result in
death or serious injury.
CAUTION
The safety message is in this box.
CAUTION indicates a potentially hazardous
situation, which, if not avoided, may result in
minor or moderate injury.
IMPORTANT NOTE
The safety message is in this box.
IMPORTANT NOTE indicates a potentially
hazardous situation, which, if not avoided, may
result in property damage.
In addition to the symbols and words explained above,
each safety message identifies the hazard, describes
what you can and should do to avoid the risk of
exposure to the hazard, and tells the probable
consequences of not avoiding the hazard.

Vehicle Equipment Installation Instructions 3
2.3.2 Safety Label Format
We include safety labels on the devices to help you
protect your safety and the safety of others. Safety
labels are designed to alert you to potential hazards
associated with a piece of equipment that can cause
personal injury to you or others. They can also
indicate the possibility of property damage.
Please read all safety labels.
Each safety label contains a safety alert symbol ( ),
one of two signal words: WARNING or CAUTION, a
pictorial showing the nature of the hazard, and a safety
message.
The signal words and symbols, and their meanings, are
shown below:
WARNING indicates a potentially hazardous
situation, which, if not avoided, could result in
death or serious injury.
CAUTION indicates a potentially hazardous
situation, which, if not avoided, may result in
minor or moderate injury.
We consider safety labels to be an important part of all
devices and they should be replaced immediately if
they become hard to read.
If any of the safety labels are missing or cannot be
read, please contact your dealer or the 3M Intelligent
Transportation Systems Technical Service department
for a replacement.

4Vehicle Equipment Installation Instructions
2.4 Safety Messages Contained in this
Manual
The following safety messages appear in this manual:
WARNING
This equipment has been approved for mobile
applications where the equipment should be
used at distances greater than 20cm from the
human body (with the exception of hands, wrists,
feet and ankles). Operation at distances less
than 20cm is strictly prohibited.
NOTE
This equipment has been tested and found to
comply with the limits for a Class A digital
device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide
reasonable protection against harmful
interference when the equipment is operated
in a commercial environment. This
equipment generates, uses, and can radiate
radio frequency energy and, if not installed
and used in accordance with the instruction
manual, may cause harmful interference to
radio communications. Operation of this
equipment in a residential area is likely to
cause harmful interference in which case the
user will be required to correct the
interference at his own expense.
NOTICE
This Class A digital apparatus complies with
Canadian ICES-003.
Cet appareil numérique de la classe A
conforme à la norme NMB-003 du Canada.
IMPORTANT NOTE
Modifying the radio/GPS unit may seriously
damage the equipment and void the warranty.
Do not attempt to modify the radio/GPS
circuitry in any way. Modifying the radio
and/or antenna in any way may cause the radio
to violate FCC requirements.
WARNING
Vehicle batteries contain sulfuric acid and
may contain explosive gases. Keep sparks,
flames, and cigarettes away. Wear eye
protection. Disconnect the negative
cable first to prevent shorting the positive
terminal to the chassis when removing
the positive cable. Battery acid may cause
skin irritation and eye injury. Explosive gases
may cause severe injury or death.
WARNING
A completed installation that is not tested may
result in improper system operation, which may
result in accidents and/or injuries. To avoid
this problem, test the system to verify
proper operation. Improper system operation
may result in unsafe driver action.

Vehicle Equipment Installation Instructions 5
CAUTION
Failure to replace the fuse size as marked may
cause property damage. Replace fuse size as
marked.

6Vehicle Equipment Installation Instructions
2.5 Label Locations
There is one safety label and one FCC label on
3M™ Opticom™ GPS Priority Control System
vehicle equipment. If a label is missing or cannot
be read, please contact your dealer or the 3M
Intelligent Transportation Systems Technical
Service department for a replacement. See Figures
2-1 and 2-2 for label locations.
CAUTION
Failure to replace the fuse size as marked may
cause property damage. Replace fuse size as
marked.
Figure 2-1. Vehicle Equipment Fuse Safety Label Location
Figure 2-2. FCC Label Location

Vehicle Equipment Installation Instructions 7
2.6 Safety Considerations
Please consider the following safety issues before
beginning the installation of 3M™ Opticom™ GPS
Priority Control System vehicle equipment.
Although we have compiled this list of common
safety considerations, it should not be considered as
complete. It is not intended to take the place of your
good judgment, training, and experience.
2.6.1 Personal Safety Equipment and Clothing
Personal safety equipment and clothing including high
visibility vests, hard hats, gloves, electrical shock or
electrocution protection clothing and equipment, safety
shoes, safety glasses, face shields, goggles, and hearing
protection devices are just some of the items available
to you.
Choose the right equipment for the job. If you are
unsure of which safety equipment is recommended or
appropriate for the job, ask your supervisor or
foreman.
2.6.2 Electric Shock
As a trained installer of electrical equipment you are
aware of the dangers associated with installation of
electrical devices. Always be sure that the power to the
equipment, and all associated equipment, is turned off
and the vehicle battery is disconnected. Use the
equipment, techniques, and procedures that you learned
during your training or apprenticeship or other electrical
industry recognized safety procedures.
If you are unsure of which techniques, procedures,
and protective equipment are recommended or
appropriate for the job, ask your supervisor or
foreman.
2.6.3 Explosion
Common automotive-type batteries produce an
explosive gas under some conditions. This gas may
easily be ignited by a spark or flame as you work on
the vehicle. To reduce the risk of explosion,
disconnect the battery, work in a well ventilated
area, avoid the use of devices that create sparks or
use open flames, and use the appropriate personal
safety equipment and clothing.
If you are unsure of which techniques, procedures,
and protective equipment are recommended or
appropriate for the job, ask your supervisor or
foreman.
2.6.4 Chemical Burns
Common automotive-type batteries contain strong acid
that can cause personal injury if you come in contact
with the acid. To reduce exposure to the risk of
chemical burns, wear appropriate protective clothing
and handle the battery with care.
If you are unsure of which techniques, procedures,
and protective equipment are recommended or
appropriate for the job, ask your supervisor or
foreman.
2.7 Disposal of Device
Please dispose of the device in accordance with all
local, state, and federal laws and regulations.
2.8 FCC Statement
This equipment has been tested and found to comply
with the limits for a Class A digital device, pursuant
to part 15 of the FCC rules. These limits are
designed to provide reasonable protection against
harmful interferences when the equipment is
operated in a commercial environment. This
equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in
accordance with the instruction manual, may cause
harmful interference to radio communications. If
operation of this equipment in a residential area
causes harmful interference, the user is required to
correct the interference at their own expense. See
Figure 2-2.

Vehicle Equipment Installation Instructions8
3 Description
This section provides a general description of the
Opticom GPS system and a detailed description of the
vehicle equipment.
3.1 Opticom™ GPS System
The Opticom GPS system assists authorized
priority vehicles through signalized intersections by
providing temporary right-of-way through the use
of common traffic controller functions.
The Opticom GPS system consists of the following
matched components:
?? Vehicle Equipment —
?? Radio/GPS unit containing a GPS receiver and a
2.4 GHz transceiver
?? Radio/GPS antenna
?? Control unit
?? Intersection Equipment —
?? Radio/GPS unit containing a GPS receiver with
antenna and a 2.4 GHz transceiver with antenna
?? Phase Selector
?? Card Rack/Input File
?? Auxiliary Interface Panel
?? Auxiliary Harness
The vehicle equipment is mounted on the priority
vehicle. Its GPS receiver acquires position information
from the constellation of GPS satellites. This
information is used to compute the location, speed, and
heading of the vehicle. This information, along with a
priority request and the state of the vehicle’s turn signal,
is broadcast using the 2.4 GHz transceiver.
The intersection equipment receives the radio
transmission from the vehicle equipment. The
intersection equipment then compares the
information being received from the vehicle to the
parameters stored in the intersection equipment’s
memory. If the vehicle is heading toward the
intersection in a predefined approach corridor, is
requesting preemption and has met all other
programmed parameters, the corresponding phase
selector output is activated. This output is
connected to the traffic controller preemption input.
When activated, the controller cycles to grant a
green light to the requesting vehicle or holds the
green allowing the vehicle to pass through the
intersection.
The card rack/input file provides the power and logic
wiring for the phase selector, which plugs directly into
a slot in the unit.
The auxiliary interface panel provides additional
connection for monitoring green phases and also
provides additional priority control outputs.
The auxiliary harness can be used to provide
additional connection for monitoring green phases
when the auxiliary interface panel is not required.

Vehicle Equipment Installation Instructions 9
3.2 Vehicle Equipment
3M™ Opticom™ GPS Priority Control System
vehicle equipment is intended for use on priority
vehicles. The vehicle equipment consists of a
radio/GPS unit containing a GPS receiver and a 2.4
GHz transceiver , a radio/GPS antenna, as well as a
control unit, which also provides an interface point
between the radio/GPS unit, the vehicle wiring, and
an external PC used for configuration, diagnostics,
and downloading log information.
This manual describes how to install the vehicle
equipment.
Please be aware of the following operational
characteristics of this equipment.
Appropriate agency ID, vehicle class, and vehicle ID
numbers are determined at the time of installation and
are programmed by the user via configuration
software.
The Disable feature uses an additional switch
(customer supplied) that connects to battery negative
or positive when actuated.
Figure 3-1 shows a typical vehicle equipment
installation for a priority vehicle.
Figure 3-1. Typical Vehicle Equipment Installation for Priority Vehicle
1.Vehicle radio/GPS antenna 7. Radio/GPS antenna cable
2. Left turn signal sense 8. Disable switch
3. Right turn signal sense 9. Fuses
4. Vehicle control unit 10. Vehicle radio/GPS unit
5. Battery 11. Vehicle interface harness
6. Light bar sense

Vehicle Equipment Installation Instructions10
4 Features
Opticom GPS system vehicle equipment has the
following features:
?? Vehicle identification encoding; selectable at
installation
?? User-selectable Disable mode; Latching or
Non-Latching modes
?? Diagnostic indicators
?? Millions of vehicle identification codes
?? Agency ID capability
?? Wide operational temperature range:
–30°F to +165°F (–34°C to +74°C)
?? Meets FCC part 15 Class A specifications
?? 15 & 20-foot cables for installation flexibility
?? Available Windows™*Configuration and
Maintenance Software
*Windows is a trademark of Microsoft Corporation.

Vehicle Equipment Installation Instructions 11
5 Installation
This section describes the installation of 3M™
Opticom™ GPS Priority Control System vehicle
equipment.
Please read and fully understand the following
paragraphs before starting the installation.
?? Before cutting or drilling any openings in the
vehicle or lightbar, draw a diagram showing
placement, measurements, and dimensions. Use
the diagram to avoid drilling or cutting holes in
undesirable locations.
?? Always follow the vehicle manufacturer's
recommendations for modification, alteration,
and installation or connection of accessories or
equipment to the vehicle and lightbar.
?? Installation on specialty vehicles (such as
motorcycles, parking enforcement, utility, and
special maintenance vehicles) requires
particular care and attention to details.
?? Do not mount the radio/GPS antenna within 18
inches of any other radio antenna. Follow the
installation instructions to avoid possible radio
frequency interference problems.
?? The radio/GPS unit is not watertight;
therefore it should be mounted inside the
passenger compartment or some other
protected area of the vehicle.
?? The radio/GPS antenna should be mounted level
and as high on the vehicle as possible. The
radio/GPS antenna should have an unobstructed
view of at least 50% of the sky.
?? The radio/GPS antenna must not be obstructed
by lightbars, speakers, antennas, or other devices
especially towards the front of the vehicle.
?? If necessary an alternate mounting bracket is
available for mounting on vehicle mirrors and
vertical posts. This bracket is available from
Mobile Mark Communications Antennas
(www.mobilemark.com, 1-800-648-2800). The
part number is SM-MM, price is approximately
$15.
?? Wires that are routed under carpets or mats
should be run between the pad and the carpet.
This will minimize abrasion and heat damage
from catalytic converters.
?? Protect cables with armor or sheathing when they
are routed around sharp corners and edges.
Avoid routing cables through potential pinch
points. Clamp or tie all cables in place. Route
and secure cables well away from moving parts.
?? Do not paint the radio/GPS antenna cover. Metals
or metal oxides in the paint may interfere with
GPS reception and/or radio reception and
transmission.
?? Do not modify the radio/GPS unit circuitry. There
are no user serviceable parts inside.
IMPORTANT NOTE
Modifying the radio/GPS unit may seriously
damage the equipment and void the
warranty. Do not attempt to modify the
radio/GPS circuitry in any way. Modifying
the radio and/or antenna in any way may
cause the radio to violate FCC requirements.
5.1 Vehicle Radio/GPS Unit Installation This subsection describes how to install the vehicle
radio/GPS unit.

Vehicle Equipment Installation Instructions12
1. Disconnect the battery before beginning the
installation. Disconnect the negative battery cable
first, then the positive battery cable.
2. Remove interior panels and headliners, as
necessary, to provide access for cable routing.
3. Determine an appropriate location in a protected
area inside of the vehicle or trunk.
4. Using the provided screws, attach the Radio/GPS
unit to the mounting location.
5. The provided screws are self drilling/tapping
screws.
Note: The radio/GPS unit is not watertight;
therefore it should be mounted inside the
passenger compartment or some other protected
area of the vehicle.
WARNING
Vehicle batteries contain sulfuric acid and
may contain explosive gases. Keep sparks,
flames, and cigarettes away. Wear eye
protection. Disconnect the negative
cable first to prevent shorting the
positive terminal to the chassis when
removing the positive cable. Battery acid
may cause skin irritation and eye injury.
Explosive gases may cause severe injury or
death.
Figure 5-1. Mounting Radio/GPS Unit on Priority Vehicle
1. Vehicle radio/GPS unit 2. Mounting screws (4)

Vehicle Equipment Installation Instructions 13
5.2 Vehicle Radio/GPS antenna installation
1. Remove the nut and washer from the
Radio/GPS antenna.
2. Drill a 5/8 to 3/4-inch hole. See Figure 5-3.
3. Route the cables through the hole. And replace
the lock washer and nut.
4. Tighten the nut with a15/16” wrench (a 24
mm wrench may be used if a 15/16’ wrench is
not available)
5. Apply silicone RTV (not provided) around the
antenna if the roof curvature prevents a good
seal with the antenna’s built-in gasket.
6. If necessary an alternate mounting bracket is
available for mounting on vehicle mirrors and
vertical posts. This bracket is available from
Mobile Mark Communications Antennas
(www.mobilemark.com, 1-800-648-2800).
The part number is SM-MM, price is
approximately $15.
Figure 5-2. Mounting Radio/GPS Antenna on Priority Vehicle
1. Vehicle radio/GPS antenna 4. Radio and GPS antenna cables
2. Vehicle mounting surface 5. 5/8 to 3/4-inch mounting hole
3. Antenna nut 6. Antenna lock washer

Vehicle Equipment Installation Instructions14
5.3 Radio/GPS Unit Cable Terminations
1. Route the cables from the radio/GPS antenna
through the vehicle to the radio/GPS unit
location.
2. Coil up any excess cable.
Note: When coiling excess cable do not create
any sharp bends in the cable or the cable may
be damaged.
3. Connect the cable labeled GPS to the GPS
connector on the radio/GPS unit. Connect
the other cable to the Radio connector.
Tighten the connectors using a 5/16” wrench
(an 8 mm wrench may also be used)
Note: The connectors are keyed and cannot be
connected to the wrong connector.
4. Plug the 15 pin connector of the radio/GPS
cable (black cable) into the P1 connector of
the radio/GPS unit and tighten the screws.
3. Route the cable to the location where the
Vehicle Control unit will be installed.
Table 5-1. Radio/GPS Unit Terminal Block
Pin Index
Pin Wire Color Function
1Yellow Radio transmit (+)
2Yellow Black Radio transmit (–)
3Blue Radio receive (+)
4Blue White Radio receive (–)
5Orange Radio clock (+)
6Orange Green Radio clock (–)
7Brown GPS power
8Brown White Common
9Violet Radio power
10 Violet White Common
11 Bare Shield drain wire
Figure 5-3. Radio/GPS Cable Installation
1. Vehicle radio/GPS unit 3. GPS antenna cable
2. Vehicle interface harness assembly 4. Radio antenna cable

Vehicle Equipment Installation Instructions 15
5.4 Vehicle Control Unit Installation
This subsection describes the installation of the
3M™ Opticom™ GPS Priority Control System
Vehicle Control Unit. It also describes connecting
the radio/GPS cable from the radio/GPS unit to the
control unit and connecting the vehicle interface
harness to the control unit.
Please read and fully understand the following
precautionary paragraphs before installing the
control unit.
?? Installations may include a customer-supplied
disable switch in addition to the control unit. The
Disable feature disables the priority request when
the disable switch closes to battery negative or
positive. This feature typically uses an existing
switch that indicates the presence of conditions
deemed appropriate to disable the priority request,
such as opening the vehicle operator’s door.
?? The control unit location must be level within 15
degrees, readily accessible, and visible to the
vehicle operator. It must be level to allow the
internal compass to function.
?? The control unit must not be in the path of
airbag deployment.
?? Use care when drilling holes to avoid drilling into
undesirable locations.
1. Determine the desired location to mount the
vehicle control unit. Mark and drill two
7/32-inch holes, using the control unit
mounting bracket as a template.
2. Insert the two 10-32 x 3/4-inch cap screws
through the holes in the mounting bracket and
mounting surface. See Figure 5-4.
3. Use the two lock washers and 10-32 nuts to
secure the bracket to the vehicle.
Figure 5-4. Control Unit Mounting Bracket Installation
1. 10-32 nut (2) 4. Mounting surface
2. Lock washer (2) 5. Mounting bracket
3. 7/32-inch hole (2) 6. 10-32 x 3/4-inch cap screw (2)

Vehicle Equipment Installation Instructions16
4. Cut the Radio/GPS cable (black cable) to the
proper length.
5. Strip approximately 3 inches of the outer jacket
from the end of the cable. Be careful not to cut
the wires inside.
6. Strip 1/4 inch of insulation from each wire.
NOTE: It is very important not to strip too
much insulation, which may lead to short
circuits; or too little insulation, which may
prevent the wire from making good contact.
7. Place each wire into the appropriate terminal in the
10-pin terminal block located on the back of the
control unit and tighten the screw to secure the
wire. The label on the terminal block shows the
color for each wire. Table 5-2 also shows the
terminal block pin number, wire color, and
function for each wire. See Figure 5-5.
The terminal block may be removed from the
control unit to allow easier connections.
8. Cut the bare wire off even with the edge of the
outer jacket of the cable.
9. Plug the vehicle interface harness into the 15-pin
connector on the back of the control unit and
tighten the screws. See Figure 5-5.
Table 5-2. Control Unit Terminal Block
Pin Index
Pin Wire Color Function
1Yellow Radio transmit (+)
2Yellow Black Radio transmit (–)
3Blue Radio receive (+)
4Blue White Radio receive (–)
5Orange Radio clock (+)
6Orange Green Radio clock (–)
7Brown GPS power
8Brown White Common
9Violet Radio power
10 Violet White Common
Figure 5-5. Vehicle Control Unit Wiring
1. Vehicle control unit 3. Radio/GPS cable
2. 10-pin terminal block 4. Vehicle interface harness

Vehicle Equipment Installation Instructions 17
10. Place the control unit into the mounting bracket.
Use the two 1/4-inch acorn nuts and lock washers
to secure the control unit to the bracket. See
Figure 5-6. The control unit must be level within
15 degrees to allow the internal compass to
function.
Figure 5-6. Vehicle Control Unit Installation
1. Mounting bracket 3. Acorn nut (2)
2. Lock washer (2) 4. Vehicle control unit
11. Route the wires of the vehicle interface harness to
the appropriate connection points. Table 5-3
shows the connector socket pin number, wire
color, and function for each wire. Figure 5-7
shows the socket view of the harness connector.
All wires may not be used in all installations.
Figure 5-7. Interface Harness Connector Socket
Table 5-3. Interface Harness Connector Pin Index
Pin Wire Color Function
1White/Yellow J1708 (+) (future use)
2Blue Lightbar sense or
Ignition switch
3Brown Low priority
4Gray Spare Input (future use)
6White Disable sense
7Green Right turn sense
8Yellow Left turn sense
9Black Ground
10 Red +12 VDC
13 White/Orange GPS TXD (-)
14 White/Brown GPS TXD (+)
15 White/Blue J1708 (-) (future use)

Vehicle Equipment Installation Instructions18
In order for the vehicle equipment to transmit turn
signal information to the intersection equipment, it is
necessary to connect the interface harness to the
vehicle turn signal indicators. This is done by
connecting the yellow wire to the left turn signal wire
and the green wire to the right turn signal wire.
12. Connect the white wire to a switch that actuates
when the driver reaches the scene and steps out of
the vehicle. For instance, this could be a door
switch. The switch may provide either +12 VDC or
a ground. You will need this information to set the
Operating mode (see Section 6.1, Configuration
Setup and Checkout).
13. Connect the blue wire to one of the provided fuse
holders. Connect the other end of the fuse holder
as described in either step a or b below. Do not
install the fuse yet.
a. Connect the fuse holder to a point that
provides +12 VDC only when the lightbar is
turned on. This enables the driver to activate
the system when the lightbar is on by pushing
the ON/OFF switch on the control unit to the
ON position.
b. Connect the fuse holder to a point that
provides +12 VDC when the ignition switch is
in the RUN position. This enables the driver
to activate the system when the ignition switch
is on by pushing the ON/OFF switch on the
control unit to the ON position.
14. Install the fuse rating label on the blue wire near
the fuse holder.
15. Connect the red wire to the provided fuse holder.
Connect the other end of the fuse holder to a +12
VDC power source that provides at least 2 amps at
all times. In order for the GPS receiver to
maintain an accurate location, the receiver requires
a constant +12 VDC power source.
3M recommends using a direct connection
to the battery. If this is not possible, use a
terminal block with a direct connection to
the battery. Do not install the fuse yet.
16. Install the fuse rating label on the red wire near
the fuse holder.
17. Connect the black wire to vehicle chassis ground
(DC–). Again, it is recommended that this
connection be made directly to the battery or to
a terminal block with a direct connection to the
battery.
18. Verify that the control unit on/off switch is set to
the OFF position.
19. Inspect all connections and verify that the wiring is
complete and accurate as described in this
installation manual.
20. Install the fuses (2A, 250V) in the fuse holders.
21. Connect the vehicle’s positive battery cable, then
connect the negative battery cable.
5.4.1 Low Priority
When Opticom GPS vehicle equipment ships from the
factory, the priority level (High or Low) is preset. The
user cannot change this priority level. However, a high
priority vehicle may be set to temporarily be a low
priority vehicle. This feature is useful for traffic
department maintenance vehicles that maintain
Opticom GPS intersection equipment where both high
and low priority vehicles operate.
Low Priority Connections:
The vehicle interface harness contains a brown wire
that when connected to +12 VDC will cause the
vehicle unit to temporarily broadcast that it is a low
priority vehicle (see Table 5-3).
1. Connect the brown wire to one side of a
switch(not provided) and connect the other side to
+12 VDC.
2. Install an in-line fuse holder with a 2A, 250V fuse
(not provided).
3. When you activate the switch, the vehicle will be
a low priority vehicle until the switch is
deactivated.
This action may be observed using the Vehicles
Heard section of ITS Explorer. Refer to the GPS
Vehicle Configuration section of the 3M™
Opticom™ GPS Priority Control System
Operation Manual.