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8
MBS-2 Installation
Color and Labeling
The malfunction indicator lamp must be yellow in color and identified with the
letters “ABS” to distinguish the lamp from other yellow side markers. The
letters may be on the lens, on the lens housing, or on the trailer itself, near
the lamp.
Intensity and Photometric Requirements
The external ABS malfunction indicator lamp must conform to SAE-J592
JUN92. Trailers shall use a combination clearance/side marker lamp marked
with a “PC” or “P2”. These lamps offer a widely diffused beam pattern
throughout a full 180-degree left and right range.
Power Line Carrier (PLC)
In order to meet the (March 2001) requirement to provide a tractor-mounted
trailer ABS malfunction lamp, the industry has adopted power line carrier
(PLC) technology. The use of a power-line-carrier permits transmission of data
between tractors and trailers without adding wires or connectors. Data is
transmitted as a series of high frequency chirps that appear on the ABS full-
time power line (the blue wire). The chirps vary in frequency between 100K Hz
and 400K Hz. The PLC signals are transmitted between trailer ABS control
units and tractor ABS control units. The tractor ABS unit has an additional
output signal that controls the cab-mounted trailer ABS
malfunction lamp.
The cab-mounted trailer ABS malfunction lamp:
• Lights to indicate a bulb check at start-up
• Remains lit at start-up if a fault code is set
•Will turn OFF after two seconds if the trailer is disconnected
• Lights during vehicle operation to indicate a fault has occurred.
In order for PLC to function, tractors and trailers must both be equipped with
PLC versions of ABS. All Wabash National MBS-2 systems manufactured after
March 1, 2001 are PLC capable.
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