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MBS-1P 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:
In order for PLC to function, tractors and trailers must both be equipped with
PLC versions of ABS. All Wabash National MBS-1P systems manufactured
after March 1, 2001 are PLC capable.
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• 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.
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