The electric horn will operate regardless of the
position of the key.
The horn will sound for the duration of the pad being
pressed, up to 60 seconds.
Suspension Controls
Air Suspension Height Control Switch
NOTICE
Do not operate the vehicle over uneven ground
such as ramps, speed bumps, curbs, etc. with
the air springs deflated. Doing this may lead to
air bag separation from the piston, preventing the
suspension air springs from re-inflating.
The air suspension height control switch is used to
adjust the vehicle height to aid in coupling or
uncoupling from a trailer. See
Pressing the upper part of the switch, toward
’LOWER’ deflates the air springs to lower the rear of
the vehicle. A red LED in the switch is illuminated
when the suspension is deflated.
Pressing the lower part of the switch, toward
’NORMAL,’ causes the air springs inflate to raise the
rear of the vehicle to normal ride height.
NOTICE
Never exhaust air from the suspension while
driving. When the air is exhausted, the
suspension will not absorb road shocks, and
components may be damaged.
Trailer Controls
Trailer Auxiliary Switch
If equipped, the trailer auxiliary switch energizes an
optional circuit that allows the trailer electrical system
to draw power for functions such as internal lights
and battery charging for lift gates.
Press the top of the switch to activate the trailer
auxiliary function. The switch light illuminates when
the switch is on.
Press the bottom of the switch to turn the trailer
auxiliary function off. See
Fifth Wheel Controls
Fifth Wheel Slide Control Switch
NOTICE
Do not activate the fifth wheel slide control valve
while the vehicle is in motion. To do so could
cause damage to the fifth wheel, the kingpin, the
cab or trailer, and ultimately to the drivetrain.
The fifth wheel air slide switch permits repositioning
of the sliding fifth wheel from inside the cab. See
Pressing the lower part of the air slide switch, toward
’LOCK,’ locks the fifth wheel to the baseplate.
Pressing the upper part of the switch, toward
’SLIDE,’ unlocks the fifth wheel slide mechanism,
allowing changes to the total length of the tractor-
trailer and changes to axle loads to comply with
varying jurisdictional laws. For detailed operating
instructions for fifth wheel slide, coupling, and
uncoupling procedures, see
f611342
09/15/2016
SUSP
HGT
LOWER
NORMAL
Fig. 4.16, Air Suspension Height Control Dash Switch
f611408
04/18/2016
TRLR
AUX
Fig. 4.17, Trailer Auxiliary Dash Switch
Driver Controls
4.7
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