Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...

PART 7: STARTING & OPERATING THE VEHICLE
ABS Warning Lamps
WARNING! Do not rely on an anti-lock brake
system that is functioning improperly. You
could lose control of the vehicle resulting in a
severe accident and personal injury. If any ABS
lamp goes on while you are driving or stays on
after the self-check, that anti-lock system might
not be working. That ABS may not function in
an emergency. You will still have conventional
brakes, but not anti-lock brakes. If any warning
lamp indicates a problem, have that ABS
checked.
ABS Warning Lamps
Truck/Tractor ABS Warning Lamp
A truck/tractor ABS warning lamp illuminates when the ignition
switch is first turned on and will remain on until the system
self-test has been completed successfully. Normally,
this ABS lamp will remain on until a speed of no more than
9 mph has been reached and the speed sensors have been
checked for correct output. The lamp 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
(see "Warning Light Bar").
ptc218aMod
CAUTION: If the truck/tractor 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.
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 (see "Warning Light Bar"):
R(08/07) Y53-6015 – 89 –