Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors

USING THE BRAKE SYSTEM
should remain off after this point unless a failure in the
system is detected. The truck/tractor ABS lamp is located
in the warning lamp cluster.
STARTING AND OPERATING THE VEHICLE
ABS
CAUTION: If the truck/tractor ABS warning
light does not illuminate when the ignition is
first turned on, there is a problem with the
bulb or wiring. You should have this checked
as soon as possible.
Trailer ABS Warning Lamp
Trucks, tractors, and trailers built on and after March 1,
2001 are equipped with power line communication (PLC)
per U.S. FMVSS 121, including a trailer ABS warning
lamp in the cab.
CAUTION: If the trailer ABS warning lamp
does not illuminate when the ignition is first
turned on, there is a problem with the bulb or
wiring. The driver should have this checked
as soon as possible.
NOTE: A successsful warning lamp illumination
and bulb check at ignition on does not indicate
that the trailer you may be connected to has
trailer ABS. You should personally inspect every
trailer to determine its braking system.
A trailer ABS warning lamp will illuminate for a bulb check
when the ignition switch is first turned on - whether or not
a trailer is connected to the vehicle. If the bulb check is
satisfactory, the lamp will next do either of the following:
1. If no trailer is connected, or if a non-ABS-equipped
trailer is connected, the trailer ABS lamp will go off
after a few seconds.
– 114 – Y53-6027 Medium Duty (R05/09)