Wiring the Integrity Light Bar in the Vehicle
23
Installation, Maintenance, and Service Manual
Federal Signal
www.fedsig.com
Wiring the Serial Interface Module
This section is an overview of default settings that are activated when connecting LED
and Mode control wires to 12 Vdc (+BAT). The basic light functions of the light bar must
be controlled by an installer-supplied control head. All programming and changes to
default settings should be done after quick testing the light bar and before installation.
Programming is covered in “Programming Priority Modes 1, 2, 3, and Intersection” on
page 17.
For a description of the control wires from the Serial Interface Module, see Table 6 on
page 18. For typical installations with common controllers and switch boxes, see the
wiring schematics starting on page 30.
For wiring the controller functions to the 24-pin cable harness of the Serial Interface
Module, see Table 5 on page 15 and the figures on pages 28 and 29. If additional wire
is necessary for the harness (except ground), 22 AWG wire is adequate. The ground wires
must be extended with 16 AWG or thicker wire.
FUSE ELECTRICAL SOURCES: Always fuse current/voltage sources with a fuse
connected near the power source. Ensure that the fuse is properly rated to protect
the electrical load, the wiring, and the connectors used in the circuit. Failure to
follow this notice could result in vehicle or equipment damage.
Priority Modes 1, 2, and 3
To activate a priority mode, apply 12 Vdc (+BAT) to a mode control wire. Mode 3 (black/
red) overrides Mode 2 (blue/white), and Mode 2 overrides Mode 1 (blue). You can program
one of the flash patterns in the light bar to each Mode input.
Steady Burn
Applying 12 Vdc (+BAT) to the red/white control wire turns on the red LED (driver side) and
the blue LED (passenger side) Steady Burn modules. Steady Burn defaults to the HotFoot
modules if red/blue colors are available; otherwise, Steady Burn turns on the red/blue
colors in the light bar if available. In the 44-inch Integrity, red is located in Module 4 and
blue in Module 7. In the 51-inch Integrity, red is located in Module 5 and blue in Module 8.
Front Cutoff
When 12 Vdc (+BAT) is applied to the Front Cutoff control wire (green/white), the selected
Mode operation is deactivated to the front of the light bar. Only the rear LEDs function.
Additionally, with Flash Takedown/Alley (red/black) active, only the alley lights turn on.
Rear Cutoff
When 12 Vdc (+BAT) is applied to the Rear Cutoff control wire (orange/black), the selected
Mode operation is deactivated to the rear of the light bar. Only the front LEDs flash.
NOTE:
The operational settings for Front Cutoff and Rear Cutoff are not independent.
The default setting is for 12 Vdc (+BAT) to be applied for the light bar’s front and rear light
heads to turn them off (Cutoff). To change the default setting to turn on these LEDs when
12 Vdc is applied (Enable), see "Front/Rear Enable or Cutoff" on page 18.
