Federal Signal Corporation Reliant Manual

25500679
Rev A2 0521
© Copyright 2021 Federal Signal Corporation
Installation, Maintenance,
and Service Manual
Reliant™Light Bar

Limited Warranty
This product is subject to and covered by a limited warranty, a copy of which can be found at
www.fedsig.com/SSG-Warranty. A copy of this limited warranty can also be obtained by written request to Federal
Signal Corporation, 2645 Federal Signal Drive, University Park, IL 60484, email to [email protected] or call
[phone].
This limited warranty is in lieu of all other warranties, express or implied, contractual or statutory, including, but
not limited to the warranty of merchantability, warranty of fitness for a particular purpose and any warranty against
failure of its essential purpose.
2645 Federal Signal Drive
University Park, Illinois 60484-3167
www.fedsig.com
Customer Support
Police/Fire-EMS: 800-264-3578 • [phone]
Work Truck: 800-824-0254 • [phone]
Technical Support 800-433-9132 • [phone]
All product names or trademarks are properties of their respective owners.

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Contents
Safety Messages.............................................................................................................................. 5
Safety Message to Installers and Service Personnel of Warning Lights...........................................5
Safety Messages to Operators of Federal Signal Sound/Light Systems ..........................................8
An Overview of the Reliant Light Bar ............................................................................................ 9
LED Lights, Colors, and Flash Patterns......................................................................................................9
Electrical System..............................................................................................................................................9
Controller Options ...........................................................................................................................................9
Product Specifications....................................................................................................................................9
Reprogramming the Light Bar...................................................................................................... 10
Reprogramming the Light Bar ....................................................................................................................10
SignalMaster®Operation: Internal (Factory Default) or External..................................................10
MODE 1, 2, 3, and INTERSECTION .....................................................................................................10
FRONT and REAR lights: CUTOFF (default) or ENABLE ................................................................. 11
Making the Electrical Connections for Reprogramming................................................................. 11
Wiring the Reliant Light Bar in the Vehicle ................................................................................ 12
Planning the Electrical Installation............................................................................................................. 12
Connecting Power to the Light Bar .......................................................................................................... 13
Low Power ................................................................................................................................................. 15
Maintaining and Servicing the Reliant......................................................................................... 16
Cleaning the Light Bar Lens........................................................................................................................ 16
Replacing a PCB............................................................................................................................................. 17
Troubleshooting the Light Bar.................................................................................................................... 19
Getting Technical Support and Service....................................................................................... 19
Getting Repair Service.................................................................................................................................. 19
Ordering Replacement Parts .....................................................................................................................20

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Figures
Figure 1 Electrical connections for reprogramming the light bar...................................................... 11
Figure 2 Cable entry location.................................................................................................................... 13
Figure 3 Relay for isolating devices with large filter capacitors....................................................... 14
Figure 4 Ground screw ............................................................................................................................... 17
Figure 5 Separated side assemblies....................................................................................................... 17
Figure 6 Locations of ROC PCBs.............................................................................................................. 18
Tables
Table 1 Dimensions........................................................................................................................................9
Table 2 Light specifications ......................................................................................................................10
Table 3 Electrical and temperature.........................................................................................................10
Table 4 SignalMaster warning patterns (internal SM control)) ....................................................... 15
Table 5 Troubleshooting tips.................................................................................................................... 19
Table 6 Replacement parts ......................................................................................................................20

Safety Messages
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Safety Messages
For your safety, read and understand this manual thoroughly before installing, operating,
and servicing the Reliant™light bar. The safety messages presented in this section
and throughout the manual are reminders to exercise extreme care at all times. Read
and understand the safety instructions and keep them close at hand for reference.
To download copies of this manual, go to www.fedsig.com/resource-library or call the
Federal Signal Service Department at 1-800-433-9132, 7  to 5 , Monday through
Friday (CT).
Safety Message to Installers and Service Personnel of Warning Lights
Before Installation or Service
Qualifications
• To properly install or service this equipment, you must have a good understanding of
automotive mechanical and electrical procedures and systems, along with proficiency
in the installation and service of safety warning equipment. Always refer to the vehicle’s
service manuals when performing equipment installations on a vehicle.
Light Hazards
• In order to be an eective warning device, this product produces bright light that can
be hazardous to your eyesight when viewed at a close range. Do not stare directly
into this lighting product at a close range, or permanent damage to your eyesight may
occur.
• Do not install the light system in an area that would block, impair, or blind the driver’s
vision. Ensure that the light system is mounted in a position that is outside of the
driver’s field of vision so the driver can maintain safe vehicle operation.
• Federal Signal power supplies and light heads are designed to work together as
a system. Combining light heads and a power supply from dierent manufacturers
may reduce the warning eectiveness of the lighting system and may damage the
components. Verify or test your combination to make sure the system works together
and meets federal, state, and local standards or guidelines.
Electrical Hazards
• Strobe systems present a shock hazard because they use high voltage to operate.
Do not handle strobe cables, the power supply or bulbs or remove the lens while the
equipment is connected. Strobe systems can also hold their charge even after they
have been turned o. After disconnecting power to the unit, wait five minutes before
handling any parts of the strobe system.
• A light system is a high current system. In order for the system to function properly,
a separate negative (-) connection and positive (+) connection must be made. All
negative connections should be connected to the negative battery terminal and a
suitable fuse should be installed on the positive battery terminal connection as close
to the battery as possible. Ensure that all wires and fuses are rated correctly to handle
the device and system amperage requirements.

Safety Messages
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• Never attempt to install aftermarket equipment that connects to the vehicle wiring,
without reviewing a vehicle wiring diagram available from the vehicle manufacturer.
Ensure that your installation will not aect vehicle operation or mandated safety
functions or circuits. Always check the vehicle for proper operation after installation.
• The lighting system components, especially light bulbs, strobe tubes, LEDs, and the
outer housing, get hot during operation. Disconnect power to the system and allow
the system to cool down before handling any components of the system.
• Halogen light bulbs and strobe tubes are pressurized and, if broken, can burst and
result in flying glass. Always wear gloves and eye protection when handling these
components.
• Do not mount a radio antenna within 18 inches of the lighting system. Placing
the antenna too close to the lighting system could cause the lighting system to
malfunction or be damaged by strong radio fields. Mounting the antenna too close to
the lighting system may also cause the radio noise emitted from the lighting system to
interfere with the reception of the radio transmitter and reduce radio reception.
• Do not attempt to wash this or any other electrical device while it is connected to its
power source. Exposure to liquid while the product is connected to the power source
may result in an electrical shock and personal injury and may short circuit and damage
the product.
During Installation and Service
• DO NOT get metal shavings inside the product. Metal shavings in the product can
cause the system to fail. If drilling must be done near the unit, place an ESD approved
cover over the unit. Inspect the unit after mounting to ensure there are no shavings
present in or near the unit.
• To avoid a battery explosion, always disconnect the negative battery cable first and
reconnect it last. Avoid causing a spark when connecting near or to the battery. The
gases produced by a battery can cause a battery explosion that could result in vehicle
damage and serious injury.
• DO NOT connect this system to the vehicle battery until ALL other electrical
connections are made, mounting of all components is complete, and you have verified
that no shorts exist. If the wiring is shorted to the vehicle body or frame, high current
conductors can cause hazardous sparks, resulting in electrical fires or flying molten
metal.
• DO NOT install equipment or route wiring (or the plug in cord) in the deployment path
of an airbag.
• If a vehicle seat is temporarily removed, verify with the vehicle manufacturer if the
seat needs to be recalibrated for proper airbag deployment.
• Before mounting any components, check the manual to verify that the component you
are installing is suitable for use in that area of the vehicle. Many components are not
suitable for use in the engine compartment or other extreme environmental exposure
areas.

Safety Messages
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• The service life of light bulbs and strobes tubes will be shortened if the
glass portion is touched during installation. Use gloves when handling these
components. If the glass portion has been touched, clean the glass carefully with
isopropyl alcohol.
• When drilling into a vehicle structure, ensure that both sides of the surface are
clear of anything that could be damaged. Remove all burrs from drilled holes. To
prevent electrical shorts, grommet all drilled holes through which wiring passes.
Ensure that the mounting screws do not cause electrical or mechanical damage to
the vehicle.
• To avoid denting the roof of the vehicle, place the light bar mounting feet as close
to outer edge of the roof as possible.
• Roof damage can occur if the hook adjustment bolts are over-tightened. Torque
the adjustment bolts to 6 ft-lb to 7 ft-lb. Install keeper plates.
• Locate the light system controls so the VEHICLE and CONTROLS can be operated
safely under all driving conditions.
After Installation or Service
• After installation, test the light system to ensure that it is operating properly.
• If a seat is temporarily removed, verify with the vehicle manufacturer if the seat
needs to be recalibrated for proper airbag deployment.
• Test all vehicle functions, including horn operation, vehicle safety functions, and
vehicle light systems, to ensure proper operation. Ensure that the installation has
not aected the vehicle operation or changed any vehicle safety function or circuit.
• Scratched or dull reflectors, mirrors, or lenses will reduce the eectiveness of
the lighting system. Avoid heavy pressure and use of caustic or petroleum based
products when cleaning the lighting system. Replace any optical components that
may have been scratched or crazed during system installation.
• Do not attempt to activate or deactivate the light system control while driving in a
hazardous situation.
• Frequently inspect the light system to ensure that it is operating properly and that it
is securely attached to the vehicle.
• After installation and testing are complete, provide a copy of these instructions to
instructional sta and all operating personnel.
• Do not use a pressure washer to clean the light bar. Failure to heed this notice will
damage the light bar.
• File these instructions in a safe place and refer to them when maintaining and/or
reinstalling the product.
Failure to follow all safety precautions and instructions may result in property damage,
serious injury, or death.

Safety Messages
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Safety Messages to Operators of Federal Signal Sound/Light Systems
People’s lives depend on your safe operation of Federal Signal products. It is important
to read and follow all instructions shipped with the products. Listed below are some other
important safety instructions and precautions you should follow:
• Do not attempt to activate or deactivate the light system control while driving in a
hazardous situation.
• Although your warning system is operating properly, it may not be completely
eective. People may not see or heed your warning signal. You must recognize this
fact and continue to drive cautiously.
• Situations may occur that obstruct your warning signal when natural and man made
objects are between your vehicle and others, such as raising your hood or trunk lid. If
these situations occur, be especially careful.
• All eective sirens and horns produce loud sounds that may cause, in certain
situations, permanent hearing loss. You and your passengers should consider taking
appropriate safety precautions, such as wearing hearing protection.
• The eectiveness of an interior mounted warning light depends on the clarity, the
tinting, and the angle of the glass it is being placed behind. Tinting, dirt defects, and
steeply angled glass reduce the light output of the warning light. This may reduce the
eectiveness of the light as a warning signal. If your vehicle has dirty, tinted, or steeply
angled glass, use extra caution when driving your vehicle or blocking the right of way
with your vehicle.
• To be an eective warning device, this product produces bright light that can be
hazardous to your eyesight when viewed at a close range. Do not stare directly into
this lighting product at a close range, or permanent damage to your eyesight may
occur.
• It is important that you fully understand how to safely operate this warning system
before use.
• Operate your vehicle and the light/sound system in accordance with your
department’s Standard Operating Procedures.
• If a selected function does not perform properly or if any of the lamps remain illuminated
when the control is o, disconnect the power connector from the control unit and
contact the nearest service center.
• At the start of your shift, ensure that the entire warning light system and the siren
system is securely attached and operating properly.
Failure to follow all safety precautions and instructions may result in property damage,
serious injury, or death.

An Overview of the Reliant Light Bar
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An Overview of the Reliant Light Bar
The Reliant™light bar is a single-level LED light bar with ROC (Reliable On-Board
Circuitry™) and Solaris®LED technologies. ROC eliminates approximately 85 percent of
potential failure points by incorporating a printed circuit board (PCB) in one assembly
to substantially reduce the number of electrical connections. Solaris S2 LED modules
use oset, complex reflector surfaces for accurate beam-shaping and the highest
optical eciency. The reflectors’ overlapping, 360-degree lighting eliminates weak
spots and provides o-axis warning around the light bar.
LED Lights, Colors, and Flash Patterns
The microprocessor inside the light bar supplies three priority operational modes and a
library of flash patterns. To increase the safety of ocers, pedestrians, and motorists, the
light bar has standard front and rear cuto, dimming, and intersection warning.
Multi-color heads are available with up to two dierent colored LEDs, eliminating the loss
of primary warning colors in takedown, alley, and directional warning positions. Individual
Reliant light heads can flash between red, blue, amber, or white.
Electrical System
The Reliant light bar is protected against reversed polarity damage. The Reliant Light
Bar can be installed in any vehicle with a 12-volt negative-ground electrical system.
Controller Options
Flash patterns are controlled through the light bar CAT5 communication cable. The
cable connects to Federal Signal Convergence network controllers or the Serial
Interface Module (Part Number 858303641).
With the Serial Interface Module, the Reliant Light Bar can be activated by Federal
Signal light bar controllers or by individual low-current switch boxes.
Other advanced features of the Reliant light bar include:
• A high degree of reliability through the use of advanced microprocessors and other
integrated circuits.
• High output, long-life LEDs with no bulbs to change.
Product Specications
Operating and technical specifications for the Reliant™light bar are listed in this section by
model.
Table 1 Dimensions
Size (L x W x H) 47.6 x 11.6 x 1.3 inches (120.9cm x 29.5cm x 3.3cm)
Weight* 20.5 lb (9.3 kg)
*with standard mounting feet

Reprogramming the Light Bar
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Table 2 Light specications
Lighting Option Current Draw Lamp Technology Reector Style
LED (all heads) 1.0 A in Steady-Burn Mode High-brightness LED O󰀨set, compound curve,
polished reector
Table 3 Electrical and temperature
Electrical
Potential
Current Draw
(50 % Flash Rate)
Operating Temp.
12.8 Vdc 13.0 A -40°F to 149°F (-40°C 50 to 65°C)
Reprogramming the Light Bar
HEAVY OBJECT: Use lifting aids and proper lifting techniques when removing or
replacing this product. Failure to heed this warning may cause personal injury.
Carefully unpack the light bar assembly and any other products included in the shipment.
Inspect them for damage that may have occurred during shipping. If a product has been
damaged, do not install or operate it. Immediately file a claim with the carrier describing
the damage.
Carefully check all envelopes, shipping labels, and tags before removing or destroying
them. If you are missing any parts, contact Customer Support at 1-800-264-3578, 7 to
5 , Monday through Friday (CT).
Reprogramming the Light Bar
Although the Reliant™light bar is configured and programmed at the factory, you may
want to change the default settings and flash patterns before installation. Before you
begin, decide if you want to change these default settings.
SignalMaster®Operation: Internal (Factory Default) or External
The internal operation uses the onboard SignalMaster controller in the light bar to
generate directional warning patterns. With Internal operation, an external SignalMaster
controller is not needed. A standard low current switch box can activate the internal
SignalMaster controller.
MODE 1, 2, 3, and INTERSECTION
• MODES 1 through 3 are most often selected by a progressive slide switch, which
enables the driver to turn on the light bar without looking down. You can select a
pattern for each mode from the light bar’s library of 26 patterns.
• The INTERSECTION flash pattern is typically a high activity pattern that attracts attention
to the vehicle as it approaches an intersection. You can select a pattern from the library
and choose one of three ways to turn on and o the pattern. The INTERSECTION flash
pattern overrides the three priority modes.
NOTE: If the SignalMaster flash pattern is turned on, it overrides the current flash pattern.

Reprogramming the Light Bar
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FRONT and REAR lights: CUTOFF (default) or ENABLE
• Set these options after you change the default settings for MODE and INTERSECTION
flash patterns. CUTOFF turns OFF the front or rear LEDs when 12 Vdc is applied to the
FRONT or REAR light control wire. ENABLE turns ON the front or rear LEDs when 12
Vdc is applied.
Making the Electrical Connections for Reprogramming
To supply power to the light bar, use a fully-charged 12-volt automotive battery and follow
these steps:
1. Place the light bar on a sturdy, flat surface.
2. Plug the CAT5 communication cable from the light bar into the controller. See Figure 1.
Figure 1 Electrical connections for reprogramming the light bar
+ -
Fuse
40 A Maxi
12 Vdc
Vehicle
Battery
Power (Red)
Ground (Black)
CAT5 Comm
Cable
To Controller or Siren
3. Attach the black ground power line to the negative battery (–GND) terminal.
4. Attach the red power line through a 40 A MAXI®fuse to the positive battery (+BAT)
terminal.
Refer to the instructions supplied with the controller or Serial Interface for additional
connections and programming information.

Wiring the Reliant Light Bar in the Vehicle
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Wiring the Reliant Light Bar in the Vehicle
Before proceeding, ensure that the light bar has been installed on the vehicle roof in
accordance with the instructions included with the mounting kit. Depending on the type
of vehicle and mounting system feature, there are two options available for installing the
light bar to the roof of the vehicle: hook-on mounting or permanent mounting.
INSTALLATION PRECAUTION: Do not mount a radio antenna within 18 inches of
the lighting system. Placing the antenna too close to the lighting system could
cause the lighting system to malfunction or be damaged by strong radio elds.
Mounting the antenna too close to the lighting system may also cause the radio
noise emitted from the lighting system to interfere with the reception of the radio
transmitter and reduce radio reception.
Planning the Electrical Installation
The light bar is completely wired at the factory and does not require any additional
internal wiring. All the conductors necessary for control of any and all basic and optional
functions are contained in the CAT5 cable. The basic light functions of the Reliant™must
be controlled by a installer-supplied control head.
To prevent damage to the light bar and vehicle and to ensure that all equipment operates
properly, carefully plan where to mount and wire the light bar and controlling equipment:
1. Verify that the light bar and mounting hardware fit the vehicle.
2. Determine where to mount the light bar on the vehicle.
3. Determine where to mount the controlling equipment:
• Trunk or remote location
• Console
AIRBAG DEPLOYMENT: Do not install equipment or route wiring in the
deployment path of an airbag. Failure to observe this warning will reduce the
eectiveness of the airbag or potentially dislodge the equipment, causing serious
injury or death.
4. Decide where to route wiring around airbag areas.
5. Decide where to route the light bar power and ground wires. When planning wire
routing, ensure that there is at least a 10-inch service loop between the light bar
cables' exit and where the cables enter the vehicle. This distance is noted by a wire
tie on the power and ground wires. See Figure 2 for recommend vehicle cable entry
location relative to the light bar.

Wiring the Reliant Light Bar in the Vehicle
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Figure 2 Cable entry location
5.00
0.50
Front of Light Bar
Vehicle Cable Entry
(Under Light Bar)
6. To make wiring easier, remove the seats, spare tire, and pull down the headliner
where needed.
7. Separate all electronic equipment wiring from two-way radio equipment wiring.
8. To avoid interference, keep two-way radio antennas a minimum of 18 in (45.7 cm) away
from warning equipment.
9. Whenever possible, run full wire lengths. DO NOT splice the wires.
10. Do not coil excess wire.
11. After drilling holes for wires, de-burr them, smooth sharp edges, and insert grommets
to protect the wires from chafing.
12. When you frame ground the equipment, use the manufacturer-supplied ground
locations in the vehicle. Ensure that the location is free of paint, dirt, and other
contaminants.
IMPORTANT: After the installation, frequently inspect the light bar and mounting feet to
ensure that all fasteners and brackets are tight.
Connecting Power to the Light Bar
NOTE: Plan the location of the wire routing hole in the vehicle roof so that the power
and communication cables do not have tight bends and have some slack to allow
disconnection on removal.
BATTERY EXPLOSION: To avoid a battery explosion, always disconnect the
negative battery cable rst and reconnect it last. Avoid causing a spark when
connecting near or to the battery. The gases produced by a battery can cause a
battery explosion that could result in vehicle damage and serious injury.
SEAT REMOVAL PRECAUTION: If a vehicle seat is temporarily removed, verify
with the vehicle manufacturer if the seat needs to be recalibrated for proper airbag
deployment. Failure to follow this warning can cause serious injury or death.

Wiring the Reliant Light Bar in the Vehicle
14 Reliant™Light Bar
Federal Signal www.fedsig.com
REVERSE POLARITY / MISWIRING: Reverse polarity or incorrect voltage may
damage the light. To avoid damage to the light, ensure that the battery voltage
is the same as the voltage rating of the light and that the correct polarity is
observed. If you are connecting to a cigarette lighter plug or 12 V outlet, connect
the positive wire to the center terminal and connect the negative wire to the outer
terminal.
To make the power connections:
1. Ensure that the lines are adequately fused as shown in Figure 1 on page 11.
2. From the light bar, route the cables into the vehicle cab. The connectors are not
waterproof. Position the connectors near the edge of the headliner or other easily
accessible location to minimize disassembly should service ever be required.
3. Crimp the supplied terminals to the user-supplied 10 AWG red and black wires. Use
the appropriate tool (Molex hand tool 0638114700). Insert the red wire into the #1
position on the connector and the black wire into the #2 position. (See the connector
on the light bar harness for reference.) Connect the CAT5 cable to the user-supplied
CAT5 extension with the supplied coupler.
4. Route and connect the black lead from the light bar to the vehicle battery’s ground
(–GND) terminal.
5. Route and connect the red lead from the light bar through a 40 A MAXI®fuse at the
source, which is the positive battery terminal (+BAT).
NOTE: Powering multiple devices with a common control wire may cause one or more
devices to briefly remain functional after signal power is removed. For example, due to
the high input filter capacitance, a strobe supply can briefly supply the current required
to signal a light bar function to remain on. If necessary, use a relay to isolate devices with
large filter capacitors. See Figure 3. All components/wires are user-supplied.
Figure 3 Relay for isolating devices with large lter capacitors
290A7446
+12 Vdc
Control Lead
(12 Vdc Signal Activated)
Relay
Fuse*
Strobe Supply
*Fuse Amperage depends on amperage of devices.
SHOCK HAZARD: Strobe and HID light systems generate high voltages.
Disconnect power from the system and wait at least 5 minutes before opening the
unit. Do not apply power to the unit while the unit is open. Failure to follow this
warning could result in serious injury or death.

Wiring the Reliant Light Bar in the Vehicle
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Low Power
NOTE: Low Power Mode and the optional AutoDim feature are disabled when the light
bar is in MODE3 or displaying the Intersection flash pattern.
LOW LIGHT HAZARD: Enabling the Low Power function in the light bar may cause
the light output to fall below certain current light output standards and guidelines
for emergency warning lights. Use extreme caution when using this function.
Ensure that the ambient light conditions are low enough that you are seen and
that the reduction of glare from the light bar is safer than full light output in the
situation. Failure to heed this warning may result in serious injury or death to you
or others in your vicinity.
When Low Power is selected, the LEDs are dimmed to approximately 50 percent of their
full brightness. Low Power is only functional in MODE 1 or MODE 2. Low Power is disabled
when switching to another flash pattern, including Intersection. To use Low Power again,
disconnect Low Power reapply Low Power after a change in flash pattern occurs.
Table 4 SignalMaster warning patterns (internal SM control))
Warning Pattern Description
LEFT Rear LEDs ash from right to left
6 5 4 3 2 1
CENTER OUT Rear LEDs ash from center out to both sides
2 1 1 2 33
RIGHT Rear LEDs ash from left to right
3 4 5 621
WARN 1 Outer LEDs alternate
2
1
WARN 2 Two outer LEDs alternate
221 1
WARN 3 Right three LEDs alternate with left three LEDs
1
1 2 2 2
2
1 1
WARN 4 Two outer LEDs ash, then the two LEDs
between the inner/outer LEDs ash
11 2 21 1
FAST Operates the selected pattern 50 percent faster

Maintaining and Servicing the Reliant
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Federal Signal www.fedsig.com
Maintaining and Servicing the Reliant
This section describes how to maintain and service the Reliant light bar. Establishing a
regular maintenance and inspection schedule extends the life of the light bar and ensures
safety. For service, support, or replacement parts, contact the Federal Signal Service
Department at 1-800-433-9132, 7  to 5 , Monday through Friday (CT).
SHOCK HAZARD: Disconnect ALL power to the light bar before any maintenance
is performed. Failure to do so may result in property damage, serious injury, or
death.
BURN HAZARD: After a prolonged operation, the unit gets hot and can cause
burns. Do not touch the unit while or shortly after it has been operating. Always
allow the unit to cool before handling it.
HEAVY OBJECT: Use lifting aids and proper lifting techniques when removing or
replacing this product. Failure to follow this warning may cause personal injury.
Cleaning the Light Bar Lens
CRAZING/CLEANING SOLUTIONS: The use of cleaning solutions, such as strong
detergents, solvents, and petroleum products, can cause crazing (cracking) of
the light bar lens and reectors. To clean the reectors, use a soft, damp cloth. To
clean the lens, use a soft cloth and a solution of water and a mild detergent.
CRAZING/CHEMICALS: Crazed, cracked or faded lenses or reectors reduce
the light output and the eectiveness of the lighting system. A lens or reectors
showing this type of aging must be replaced. Failure to follow this warning may
result in bodily injury or death.
EQUIPMENT DAMAGE: Do not use a pressure washer to clean the light bar.
Failure to heed this notice will damage the light bar.
To clean the light bar lens:
1. Rinse the lens with lukewarm water to loosen dirt and debris.
2. Use a mild detergent, lukewarm water, and a soft cloth to gently clean the lens.
To avoid damaging the finish, do not use heavy pressure or caustic, abrasive, or
petroleum-based cleaners.
3. Rinse and dry the lens with a soft cloth to prevent water spots.

Maintaining and Servicing the Reliant
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4. To remove fine scratches and haze, use a soft cloth and a high-quality automotive
paste cleaner/wax that is non-abrasive.
Replacing a PCB
The Reliant™light bar has two end and two intermediate ROC (Reliable Onboard
Circuitry™) PCBs. The passenger side intermediate ROC contains the controller circuitry.
See Figure 4.
Figure 4 Ground screw
Ground Screw Bottom View
DS
PS
STATIC SENSITIVE DEVICE: This light bar circuitry can be damaged by
electrostatic discharge (ESD). Follow anti-static procedures when servicing this
light bar.
To replace a PCB:
1. Disconnect all power to the light bar.
2. Refer to the instructions supplied with the mounting kit to detach the light bar from the
vehicle.
3. Remove the two cable clamps that secure the service loop to free the cable loop. Flip
the bar upside down. To service the bar on a bench, disconnect the cables inside the
vehicle and remove the bar.
4. Mark the position of the mounting feet, and then loosen the 5/16-inch nuts securing
the mounts to the extrusion so the mounts can be moved for screw access.
5. Remove the seventeen six-lobe screws securing the extrusion. Note the ground screw
has a lockwasher. See Figure 4.
6. Remove the extrusion and separate the side assemblies about an inch. See Figure 5.
Figure 5 Separated side assemblies

Maintaining and Servicing the Reliant
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Federal Signal www.fedsig.com
7. Loosen the bases from the domes. The lip seal makes it a snug fit. Lift the DS (Driver
Side) base and disconnect the harness connected to the PS (Passenger Side).
8. Lift the PS base and disconnect the harness connected to the DS. Remove the bases.
9. Disconnect the CAT5 and power and ground wires.
10. Remove the reflectors and PCBs. See Figure 6.
Figure 6 Locations of ROC PCBs
PS
PI DI
DS
+
-
J5
J4
11. Inspect all components and replace damaged, aged, or questionable parts.
To reassemble, perform this procedure in reverse. Note the following:
• The reflectors are properly seated to the PCBs.
• J5 is +12V, J4 is ground. Do not reverse polarity.
• Dress the PS-DS harness so that it is not pinched when the extrusion is installed.
• Reseal the harness and wire exits with RTV before installing extrusion.
• Do not cut new threads. Back the screw counter-clockwise until you feel the screw
click into the existing thread, and then tighten. Start the ground screw with the
lockwasher first. Do not overtighten.
• Tighten the mounting feet according to the mounting feet kit instructions.

Getting Technical Support and Service
19
Installation, Maintenance, and Service Manual
Federal Signal www.fedsig.com
Troubleshooting the Light Bar
This section provides troubleshooting assistance for common problems. If you have any
questions left unanswered, call the Federal Signal Service Department at 1-800-433-9132,
7  to 5 , Monday through Friday (CT).
Table 5 Troubleshooting tips
Problem Corrective Action
The light bar does not light • Verify that the light bar’s red power line (+BAT) and the black
ground- power line (–GND) are properly connected to a good, fully
charged 12-volt battery. Check the 40 A fuse.
• Verify that the CAT5 cable is connected to the controller and there
are no damaged pins in the sockets.
• Try a new CAT5 cable.
An LED module does not light • Swap the LED board with a good board to see if the board is bad.
• Check the connections of the cable that goes from the light bar
controller to the LED ROC (Reliable Onboard Circuitry™) board.
Half of an LED module does not light • Replace the ROC board that the LED is on.
Getting Technical Support and Service
For technical support and service, please contact:
Service Department
Federal Signal Corporation
Phone: [phone]
Email: [email protected]
www.fedsig.com
Getting Repair Service
The Federal Signal factory provides technical assistance with any problems that cannot
be handled locally.
Any units returned to Federal Signal for service, inspection, or repair must be
accompanied by a Return Material Authorization (RMA). Obtain a RMA from a local
Distributor or Manufacturer’s Representative.
Provide a brief explanation of the service requested, or the nature of the malfunction.
Address all communications and shipments to the following:
Federal Signal Corporation
Service Department
2645 Federal Signal Drive
University Park, IL 60484-3167

Getting Technical Support and Service
20 Reliant™Light Bar
Federal Signal www.fedsig.com
Ordering Replacement Parts
To order replacement parts, call Customer Support at 1-800-264-3578, 7 a.m. to 5 p.m.,
Monday through Friday (CST) or contact your nearest distributor.
Table 6 Replacement parts
Description Part No.
Clear Dome 858003474
Amber Dome 858003474-02
Blue Dome 858003474-03
Red Dome 858003474-04
Clear Lip Seal (6 feet per section) 8583020-01
End PCB Assembly (Congured) Contact Factory
Intermediate PCB Assembly (Congured) Contact Factory
2645 Federal Signal Drive
University Park, Illinois 60484-3167
www.fedsig.com
Customer Support
Police/Fire-EMS: 800-264-3578 • [phone]
Work Truck: 800-824-0254 • [phone]
Technical Support 800-433-9132 • [phone]