Ignition Key Switch
The ignition key switch located to the left of
the steering column has four positions:
ACC (Accessories), OFF, ON, and START.
OFF: In this position all accessories are OFF (except
those listed below) and you can remove the
key.
The following lights and accessories
have power when the key is in the
OFF position:
• brake lights
• emergency hazard flasher
• dome and courtesy lamps
(on doors)
• electric horn
• cigarette lighter
• tail lights
• marker lamps
• headlights
• radio station memory
• instrument lights
• auxiliary power
• instrument panel memory
settings
ACC
(Accessory):
With the key in this position you can
play the radio, defrost mirrors (if
equipped with mirror heat) or use
other accessories.
ON: In the ON position all circuits are
energized. Panel warning lights will
light and the buzzer will sound until
(1) the engine is started, (2) normal
oil operating pressure is reached, and
(3) air brake system pressure is
above 65 psi (441 kPa). In this
position, the ignition key cannot be
removed.
START:
Turn the key to this position to start
your engine. Release the key after
the engine has started.
Exterior Lighting Self-Test
When the feature is engaged, via a switch
on the dash, it will illuminate the:
• Park lights
• Side marker lights
• Hazard/turn signals
• Low beam headlamps
• First set of fog/driving lights
The test will turn those lights off and then
illuminate the:
• Park lights
• Side marker lights
• High beam headlamps
• Stop/Brake lights
After turning these lights off, the system
will resume testing the first set of lights.
The light test will eventually stop on its
own. The operator may interrupt the test by
turning the vehicle off or pressing the
switch a second time while the test is
running. The operator can verify light
functionality by visibly watching the lights
from outside the vehicle or by observing
the instrument cluster for lighting-related
warnings. The ELST will also start the
Systems Check (Systems Check on page
30).
Test the Exterior Lights
To start the Exterior Light Self Test (ELST)
feature:
CONTROLS - Ignition Key Switch
Y53-6076-1D1 (09/20) 103
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