Sae J2497 (Plc) Diagnostic Link; Sae J1939 (Can) Diagnostic Link; Auxiliary I/O - BENDIX TABS-6 Service Data

10. SAE J2497 (PLC) DIAGNOSTIC LINK

All newer towed vehicles transmit a signal over the power
line to the towing vehicle ABS ECU. The signal, using a
heavy vehicle industry standard known as Power Line
Carrier (PLC\J2497), is broadcast by the trailer ABS ECU
over the blue wire (ignition power line) of the SAE J560
connector and controls an in‑cab trailer ABS indicator lamp.
see Figures 7 and 8.
FIGURE 7 - PoWeR line Without Plc SiGnAl
FIGURE 8 - PoWeR line With Plc SiGnAl
The Bendix TABS‑6 Adv MC module provides a data link
® ™
for PLC communication following the SAE J2497 standard.
Bendix ACom diagnostics software (version 6.1 and
® ®
higher) and the Bendix
(TRDU ) both support PLC communication with the
™
TABS‑6 Adv MC module.
PLC communication is applicable for 12-volt vehicle
applications only. The PLC communication is disabled for
voltages greater than 18 volts.
Identifying and Measuring the PLC Signal
A TABS-6 Adv MC 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 TABS‑6 Adv MC 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, using the power line. For more information on
these diagnostic tools, contact Bendix or refer to your local
authorized Bendix dealer or distributor.
Trailer Remote Diagnostic Unit
®
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 2.5 mV p-p to 7.0 V p-p.
Suggested oscilloscope settings are (AC coupling, 1 volt/
div, 100 µsec/div). The signal should be measured on pin 7
of the J560 connector at the nose of the trailer.

11. SAE J1939 (CAN) DIAGNOSTIC LINK

The TABS‑6 Adv MC module provides a data link for
transmitting CAN information following the SAE J1939
standard.
Bendix ACom diagnostics software (version 6.1 and
® ®
higher) and the Bendix
support CAN communication with the TABS-6 Adv MC
module.
Ignition power must be provided to the TABS‑6 Adv MC
module for the diagnostic link to be active.

12. AUXILIARY I/O

The TABS‑6 Adv MC module provides for up to six auxiliary
input/output (I/O) functions. see Chart 3.
12-Pin
ECU
Name
Conn.
(X2)
High-Side Driver
Aux I/O 1
1
(AuxIO1)
Digital Input
High-Side Driver
Aux I/O 2
2
(AuxIO2)
Digital Input
High-Side Driver
Aux I/O 3
3
(AuxIO3)
Digital Input
AuxRet 12 11 Low-Side Driver
AuxRet 3 12 Low-Side Driver
Sens_Sup 4 +5V Sensor Supply
Sens_In 5 Analog Input
Sens_Gnd 6 Low-Side Driver
CHART 3 – AuxiliARY i/oS
Bendix ACom diagnostic software (version 6.1 and
® ®
higher) supports the configuration of the TABS-6 Adv MC
module auxiliary I/Os.
Trailer Information Module both
®
Auxiliary
Auxiliary Functions
Type
Output
Input
Output
Input
Output
Input
Output
Output
Output
Input
Input
9