SWITCHES
3
Exterior Lights Self Test
To start the Exterior Light Self-Test
(ELST) feature:
1. Park the
vehicle and set the
parking brakes.
2. Insert the
key into the ignition, start
the engine and allow the vehicle
to run through its own Power On
Self Test.
3. Press the
momentary switch on
the dash to start the ELST.
This feature
allows the operator to
verify and inspect exterior lighting
operation typically performed during a
pre-trip inspection. When the feature
is engaged, via a switch on the dash, it
will illuminate the:
• Park lights
• Side marker lights
• Hazard/turn signals
• Lo beam headlamps
• First set of fog/driving lights
The test
will turn those lights off and
then illuminate the:
• Park lights
• Side marker lights
• Hi beam headlamps
• Stop/Brake lights
After turning
these lights off, the
system will resume testing the rst 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 the light functionality by
visibly watching the light from outside
the vehicle during the test or can read
the instrument cluster for any faults
displayed that are lighting related.
3-78 Y53-6047–2C (04/13)
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