Peterbilt 579 Operator's Manual page 196

OPERATING THE BRAKE SYSTEM
NOTE
For doubles or triples, the lamp does
not distinguish between trailers. An
ABS problem in any of the trailers
will activate the Trailer ABS Warning
Lamp.
NOTE
If you change the intended service
in any way (e.g., number of axles,
multiple trailers, add switchable trailer
4
accessories, etc.) from the date the
vehicle was manufactured, you should
contact your trailer
and/or trailer anti-lock brake man-
ufacturer to determine if the power
available at the 7-way trailer light line
is adequate. Failure to do so might
result in insufficient power to the trailer
ABS system, which may affect its op-
eration.
4-24
The center pin of the 7-way trailer light
line may be constantly powered for
ABS. Make sure it will not accidently
turn on trailer equipment.
manufacturer
CAUTION
Y53-6047–2C
Special Trailer ABS (Without PLC)
Option
If a trailer does not have PLC, but
it does have ABS that is powered
through an optional second trailer
connector (ISO 3731) and that trailer
ABS is designed to control the Trailer
ABS Warning Lamp in the cab and
the vehicle has been ordered with the
option to turn on this lamp for these
types of trailers, then this lamp will turn
on when that trailer ABS has a system
problem. This should be checked by a
dealer as soon as possible. The Trailer
ABS Warning Lamp will not turn on for
the power-on test when connected to
these types of trailers.
NOTE
Very few trailers built before 3/1/01
have this option. Trailers built after
3/1/01 are built with PLC technology.
(04/13)