Mounting Configurations; Plc Communications; Wiring Harness (Pigtail) - BENDIX TABS-6 Service Data

MOUNTING CONFIGURATIONS

For all NPT fittings use of a thread sealant is
required. For NPTF fittings the use of a thread
sealant is recommended, this can be a pre-applied
or a hand applied sealant product (with PTFE).
When using a hand-applied sealant, use caution
so as not to over apply. Always follow the fitting
manufacturer's pre-applied or hand-applied thread
sealant recommendations. Use of PTFE tape is not
approved and will void the Bendix
warranty.
Tank (Nipple) Mount
The Bendix TABS-6 modules can be tank-mounted using
® ™
a schedule 80 (heavy gauge steel) 3/4" NPT nipple directly
between the trailer supply tank and the module's supply
port. A tank with a reinforced port must be used.
Frame (Chassis) Mount
The Bendix TABS-6 module provides through-holes for
frame mounting directly to the trailer frame rail or cross-
member. It is recommended to use two Grade 5 3/8-16
bolts, typical length 5", torqued to 180-220 in-lbs.
POWER LINE CARRIER (PLC)
COMMUNICATIONS
Since March 1, 2001, all new towed vehicles transmit a
signal over the power line to an in-cab trailer ABS Indicator
Lamp. The signal, using a heavy vehicle industry standard
known as "PLC4Trucks," is typically broadcast by the
trailer ABS Electronic Control Unit (ECU) over the blue
wire (ignition/power line) of the SAE J560 connector. See
Figures 2 and 3.
Bendix TABS-6 modules support PLC communications in
accordance with SAE J2497.
Identifying and Measuring the PLC Signal
A Bendix TABS-6 module will continuously broadcast PLC
messages that indicate trailer ABS status. At power-up
or during a trailer ABS Diagnostic Trouble Code (DTC)
condition, the Bendix TABS-6 module will signal the
tractor ABS unit to illuminate the dash-mounted trailer ABS
indicator lamp.
Diagnostic tools are available that detect the presence
of a PLC signal and perform further system diagnostics
directly on the power line. For more information on these
diagnostic tools, contact Bendix or refer to your local
authorized Bendix dealer or distributor.
An oscilloscope can also be used to verify the presence
and strength of a PLC signal on the power line. The PLC
signal is an amplitude and frequency modulated signal.
Depending on the load on the power line, the amplitude
of the PLC signal can range from 5.0 mV p-p to 7.0 V p-p.
ABS/TRSP valve
® ™
FIGURE 2 - POWER LInE WITHOUT PLC SIGnAL
FIGURE 3 - POWER LInE WITH PLC SIGnAL
Suggested oscilloscope settings are (AC coupling, 1 volt/
div, 100 µsec/div). The signal should be measured on
pin seven (7) of the J560 connector at the nose of the trailer.
PIGTAIL WIRING HARNESSES
Several pigtail wire harnesses are available to connect
the Bendix TABS-6 module with ABS and other trailer
system components. See Figure 4. Pigtail harness are
weather sealed at the connector interface and are clearly
labeled for proper installation. Because of the over-molded
design of the TABS-6 module wiring harnesses, Bendix
recommends that the complete harness be replaced if
damage or corrosion occurs.
The following connector options may be present:
Modulator 2 (MOD2), Modulator 3 (MOD3), auxiliary,
diagnostic, and additional axle wheel speed sensors.
Note: All Bendix TABS-6 modules include the two primary
wheel speed sensor connections and therefore these are
separate from the pigtail harness.
ECU Connectors
Standard Bendix TABS-6 module ECU connectors use
a TTMA 97-99 5-pin Delphi Weather Pack connector for
brake light power, constant power, ground, and the trailer-
mounted ABS indicator lamp.
Premium Bendix TABS-6 module ECU connectors use an
18-pin Deutsch DT series connector for the same function
as above, plus additional modulators, wheel speed sensors
and auxiliary I/O's.
3