Peterbilt 579 - Page 136

SWITCHES
3
NOTE
The generic air accessory switch is de-
signed by the original equipment man-
ufacturer to reset when the ignition
power is turned off. When ignition is
turned off, this circuit will exhaust air
pressure.
SPARE
26. Generic, Spare
Turn
switch on to power customer
installed accessory.
27. Ignition Key Switch
The ignition
key switch (located to
the left of the steering column) has
four positions: ACC (Accessories),
OFF, ON, and START. For more
information, see
Ignition Key
Switch on
page 3-96.
28. Lights, Auxiliary
Turn
switch on for Auxiliary Lights.
29. Lights, Beacon
Turn
switch on for Beacon Light(s).
30. Lights, Daytime Running
Lights (DRL) (with optional
over-ride switch)
Three controls
(or conditions)
will affect whether the system
is ON or OFF:
• headlight (master)
switch
• engine cranking
• parking brake
If the headlight switch is turned
OFF, the DRL system engages
automatically after the engine starts
and you release the parking brake.
If the headlight switch is ON, the
DRL system is overridden, and
headlights operate normally. Also,
during engine cranking the DRL
is temporarily turned off.
WARNING!
Do not use daytime running lights
(DRL) during periods of darkness or
reduced visibility. Do not use DRL as a
substitute for headlights or other lights
during operations that require lighting
of your vehicle. Failure to comply may
result in death, personal injury, equip
-
ment or property damage.
31. Lights, Dome
Turn
switch on for Cab Dome Lights.
32. Lights, Exterior
Lights Self Test
This switch
will engage a program
which will illuminate exterior light for
the operator to verify functionality.
Please refer
to Exterior Lights Self
Test
on page 3-78 for more detail
on how
to use the program.
33. Lights, Flood
Turn
switch on for cab mounted
Flood Lights.
34. Lights, Flood
ISO 3732 Spare
Turn
switch on for trailer mounted
Flood Lights.
35. Lights, Fog
Turn
switch on for Fog Lights.
3-64 Y53-6047–2C (04/13)