Foot Well Courtesy Lamp Switch
Courtesy lights illuminate the footwell area on both
sides of the cab, and the bottom of the door panels.
The driver’s courtesy light is located on the steering
column and the passenger’s footwell light is located
on the lower right dash panel. There is also a cour-
tesy light in the lower portion of each cab door. The
courtesy lights activate when a door is opened or
with the dash switch. See
Fig. 5.5.
Mirror Heat Switch
The outside mirrors can be heated to keep them
clear of fog, frost, and ice. In order for the heated
mirrors to operate, the key must be turned to ON.
Press the upper part of the mirror heat switch to acti-
vate it. See
Fig. 5.5.
Main Dash Switches
See Fig. 5.6 for a general layout of main dash elec-
trical switches.
NOTE: See Chapter 10 in this manual for de-
tails on operating the cruise control, and the en-
gine brake.
Marker Lights Interrupt Switch
The marker lights interrupt (MRKR INT) switch tem-
porarily deactivates the marker lights and taillights.
With the vehicle lights on, raise and hold the paddle
switch to briefly turn off the marker lights and tail-
lights. To alert the driver that the switch is function-
ing, the dash lights will flash with the marker lights
when the switch is actuated. When the paddle is re-
leased the marker lights will return to normal opera-
tion. See
Fig. 5.6.
Road Lamp Switch
The optional road lamp (ROAD LAMP) switch (see
Fig. 5.7) operates the road lights mounted on the
bottom edge of the front bumper or recessed in the
front bumper.
For vehicles built to operate in the United States, the
low beam headlights must be turned on before the
road lamps can be turned on. The road lamps will
not illuminate if the high beam headlights are already
on, and switching from low beams to high beams will
switch off the road lamps. For vehicles built to oper-
ate in Canada, the marker lights must be on before
the road lamps can be turned on.
Regen Switch
A parked regen of the aftertreatment system can be
initiated with the regen switch. See
Fig. 5.6.
Refer to Chapter 11 for instructions on how to per-
form a parked regen.
An optional inhibit regen switch provides additional
control over the aftertreatment regeneration process.
When activated, the inhibit switch will stop a regen-
eration cycle in progress, and prevent the start of a
regeneration cycle until the switch is no longer ac-
tive. See
Fig. 5.8.
ATC Switch
The Automatic Traction Control (ATC) switch is a mo-
mentary switch. Briefly push the top of the switch to
activate or deactivate it. See
Fig. 5.6.
The ATC system limits wheel spin when power is ap-
plied to the drive axles during reduced-traction situa-
tions. When the ATC is active, the ATC will apply
gentle braking to the spinning wheel, to force power
to the wheel(s) with better traction. If both wheels are
spinning, the system will signal the electronic engine
to reduce power.
Pressing the ATC switch will temporarily allow more
drive wheel spin, to help burn through a thin layer of
ice, or to help throw off accumulated mud or snow.
When the switch is activated, an ATC or WHEEL
SPIN icon located in the driver’s message center will
blink slowly. Pressing the switch again will cycle the
system back to normal operation.
Engine Fan Switch
The engine cooling fan can be manually activated
with the engine fan switch. The fan will continue to
operate for a set amount of time and then turn off
unless the coolant temperature is high enough to
continue the fan operation. To turn the engine fan on,
press on the upper part of the switch. Press the bot-
tom of the switch to deactivate it. See
Fig. 5.6.
Trailer Auxiliary Switch
Trailers that are equipped with pneumatic brakes and
used in North America or South America are gener-
ally equipped with an electrical cable that terminates
in a 7-way connector. Power for the trailer lights is
Driver Controls
5.4
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