Theater Lighting
Some vehicles come pre-set with theater lighting.
Theater lighting gradually illuminates the overhead
and reading lights when they are turned on and a
gradually dims these lights when they are turned off.
Horn Controls
Air Horn
Air horn(s) may be mounted on the roof of day cabs,
or under the driver-side floor for sleeper cabs. The
air horn is controlled by a wire lanyard that hangs
down inboard by the driver’s door. See
Fig. 4.10.
Pull downward on the lanyard to sound the air horn.
Electric Horn
The electric horn is activated by pressing down on
the top of the steering wheel center pad.
The horn will sound for the duration that the button is
pressed, up to 60 seconds. The electric horn will op-
erate regardless of the position of the ignition key.
Powertrain Controls
Aftertreatment System Regen
Switches
NOTE: See Chapter 14 Emissions and Fuel
Efficiency for detailed information about the op-
eration of the regeneration (regen) switches and
the aftertreatment system (ATS).
Regen may be started manually with the optional
digital switch in the ICU. See Fig. 4.11.
Some vehicles may be equipped with a regen inhibit
switch. See
Fig. 4.12. To stop a regen in progress or
prevent the start of a regen, press the upper half of
the switch. Regen will be delayed until the switch is
no longer active.
06/13/2007 f602322
1
1. Lanyard
Fig. 4.10, Air Horn Control
f61146710/28/2016
Fig. 4.11, Regen Start Digital Switch - ICUC
f611395
04/18/2016
REGEN
OFF
Fig. 4.12, Regen Inhibit Switch
Driver Controls
4.7
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