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5. MOUNTING CONFIGURATIONS

6. WIRING HARNESSES

Refer to Section 20, Installing the iTABS Module.

See Figure 5. Wiring harnesses are available to connect the
iTABS module to the main trailer power harness and other
supported auxiliary features. Wiring harnesses are weathersealed at the connector interface and are clearly labeled for
proper installation. Because of the over-molded design of the
iTABS module wiring harnesses, Bendix recommends the
complete harness be replaced if damage or corrosion occurs.

•
D

C

•

B

Tank (Nipple) Mount: The iTABS module can be
tank-mounted using a schedule 80 (heavy-gauge
steel) 3/4-in. NPTF 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 iTABS module provides
mounting stud ports for frame mounting directly to the
trailer frame rail or cross‑member. Using appropriate
M10x1.5 mounting hardware, torque bolts to 221 in.-lb
(25 N•m) and torque nuts to 354 in.-lb (40 N•m).

A

E

D

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z

See Figure 1. The iTABS module includes two (2) primary
WSS inputs and two (2) additional tristate inputs. The
harnesses used for them are separate from the main pigtail
™
harness. Refer to BW8292, Bendix® iTABS™ a..=
and iTEBS
HARNESS
Harnesses and Connectors, on B2Bendix.com.
TREATMENT
MATERIAL

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16

15

14

13

12

I I

10

9

8

7

6

5

4

3

2

ECU CONNECTORS
See Figure 5. iTABS module ECU connectors use a 7-pin
TE Connectivity™ HDSCS connector for brake light power,
constant power, the trailer-mounted ABS indicator lamp,
ground, and – depending on the harness version – it may
include the AUX 1 I/O. Note that some parts may be preconfigured with auxiliary features on the AUX I/Os and may
require additional harnessing.
POWER/ABS INDICATOR LAMP CONNECTOR

6

The other end of the iTABS module harness uses a TTMA
RP 7‑99 5-pin Packard® Weather Pack connector for brake
light power, constant power, ground, and the trailer-mounted
ABS indicator lamp. See Figure 7.

SAE J1939 (CAN) CONNECTOR
GROUND

The iTABS module main power harnesses provide a CAN
connection for various ECU communications. Typical uses
include J1939 diagnostics and a connection to telematics
devices.

TAIL AND
RUNNING
LIGHTS

CLEARANCE/
MARKER

IGNITION
POWER

POWER AND GROUND

LEFT TURN
SIGNAL

Trailer electrical power is supplied to the iTABS module from
the ignition and brake light circuits as per SAE J560. See
Figure 6. Refer to Tables 1 and 2 for output values and pin
locations.

RIGHT TURN
SIGNAL
STOP LAMP
POWER

Figure 6 – J560 7-pin Trailer Connection Pinout

IMPORTANT
Bendix highly recommends using new power harnesses
going from the nosebox of the trailer (the front electrical
connection point between the trailer and tractor) to the
iTABS module.
Function Mode

Value

Operating Range

9.0-16.0 VDC

ECU Active

150 mA @ 12 VDC

ABS Active

2.4 A @ 12 VDC

Figure 7 – 5-pin ABS Connector Pinout

Table 1 – Values for Outputs

Circuit
Ignition PLC
(Blue Wire)

NOTE: Pin “C” is not used.

7-Pin
Trailer
Conn.

5-Pin
ABS
Conn.

7-Pin
ECU
Conn.

7

B

2

4

A

1

Ground

1

E

3

ABS Indicator Lamp

N/A

D

4

(See Figure 4)
(Use ground pin 3 on the 7-pin
ECU connector)

N/A

N/A

5

TI-CAN H

N/A

N/A

6

TI-CAN L

N/A

N/A

7

(White Wire)
(White/Green Wire)

AUX I/O 1

Table 2 – Main

Power Harness and Connector Pins

7

SR WSS
and Tristate
2 Input

1

1

X2

Brake Light Power
(Red Wire)

SL WSS
and Tristate
1 Input

X3

4

Figure 8 – 7-pin ECU Connector Pinout

4

7. SAE J2497 POWER LINE CARRIER
(PLC) DIAGNOSTIC LINK
See Figures 9 and 10. 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.

8. SAE J1939 (CAN) DIAGNOSTIC LINK
The iTABS module provides a data link for transmitting
CAN information following the SAE J1939 standard. ACom
Diagnostic Software supports CAN communication with the
iTABS module. Ignition power must be provided to the iTABS
module for the diagnostic link to be active.
NOTE: Suitable harnessing will be required for this function.

9. AUXILIARY I/O AND
FUNCTIONS PINOUT
Refer to Table 3. The iTABS module provides for up to one
(1) AUX I/O and two (2) tristate functions. For AUX1, use
ground pin 3 on the 7-pin ECU connector (refer to Table 2).
Name

Figure 9 – Power Line Without PLC Signal

AUX1

ECU
Connector
X1

ECU Pin
5

AUX
Functions

AUX
Type

High-Side
Driver

Output

Digital Input

Input

Tristate
1

X2

3 and 4

Tristate Input

Input

Tristate
2

X3

3 and 4

Tristate Input

Input

Table 3 – AUX I/O and Function Pinouts

10. CUSTOMER SCRATCH PAD
Figure 10 – Power Line With PLC Signal
IDENTIFYING AND MEASURING THE PLC SIGNAL
The iTABS module will continuously broadcast PLC
messages that indicate trailer ABS status. At power-up, or
during a trailer ABS DTC condition, the iTABS module will
signal the tractor ABS unit to illuminate the dash-mounted
trailer ABS indicator lamp.
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 Alternating Current
(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.

8

The iTABS module has a customer scratch pad feature which
allows the customer – or end-user – to store up to 1,008 bytes
of information. This information can then be read using ACom
Diagnostic Software.

11. POWER-UP SEQUENCE

12. ODOMETER FUNCTION

At power-up, the iTABS module performs a series of selfchecks that can assist a technician in determining the ABS
system status.

ODOMETER

TRAILER ABS INDICATOR LAMP
See Figure 11. At power-up, with no active DTC, the trailer
ABS indicator lamp will illuminate for approximately two (2)
to six (6) seconds as a bulb check and then turn off. If any
active DTCS related to ABS are present, the trailer ABS
indicator lamp will remain illuminated. If a PLC-ready towing
vehicle and trailer are powered at the same time, the iTABS
module will also trigger a bulb check on the dash-mounted
trailer ABS indicator lamp.
MODULATOR CHUFF TEST AT POWER-UP
At power-up, the iTABS module activates a modulator chuff
test. This electrical and pneumatic ABS modulator test
can help the technician identify problems with modulator
installations and/or wiring. With brake supply pressure
applied, a properly installed modulator will cause two (2) rapid
audible chuffs of air pressure. NOTE: The iTABS module will
not perform a modulator chuff test with an active ABS DTC.
Power
Application

ABS System
Status Indicators

1.0 2.0 3.0 4.0 5.0 6.0 (sec.)

Trailer-mounted ABS
Indicator Lamp

ON

Dash-mounted Trailer
ABS Indicator Lamp
(PLC Detected)*

ON

Dash-mounted Trailer
ABS Indicator Lamp
(PLC Not Detected)

OFF

OFF
ON
OFF

*Some vehicle manufacturers may illuminate the trailer ABS
indicator lamp at power-up regardless of whether a PLC
signal is detected from the trailer or not. Consult the vehicle
manufacturer’s documentation for more details.

Figure 11 – Trailer ABS Lamp Power-Up Sequence

9

The iTABS module includes an odometer function to provide
a means of storing the accumulated mileage of the vehicle.
The mileage is computed by using information received from
the vehicle WSS.
This feature is accurate to within 0.62 miles per power‑up
and will typically store mileage up to 1,000,000 miles. The
mileage can be displayed using PC diagnostics or through
blink codes.
Whenever the iTABS module is towed using a pre‑1997
tractor (with no constant ignition power supplied to the trailer),
no information about mileage will be stored during that time,
and the mileage can be considered out of calibration.
The iTABS module can keep track of the trailer odometer
mileage if a module replacement is done. This is done when
the operator chooses to input a mileage offset. For example,
if a module replacement has been done at a trailer odometer
of 100,000 miles, the operator would input 100,000 miles as
the offset using ACom Diagnostic Software.
TRIP COUNTER
The iTABS module provides a counter to record the trip
mileage. The feature can be accessed using PC diagnostics.
SERVICE INTERVAL
The iTABS module provides a feature that can be used to
indicate a service interval for the trailer. The service interval
can be accessed using PC diagnostics.

13. NON-STANDARD TIRE SIZE

15. PARTIAL ABS SHUTDOWN

The iTABS module allows for tire rolling radius and tone ring
tooth count parameters to be set for the axle being sensed
using ACom Diagnostic Software. These adjustments may be
necessary for the module to accurately calculate the vehicle
velocity and odometer mileage. Wheels of the same axle
must have and be set to the same rolling radius and tone
ring tooth count. Refer to the manufacturer’s tire specification
for correct values.

Depending on the DTC detected, the ABS ECU will partially
or completely disable the ABS functionality. In cases where
the ABS is completely disabled, the vehicle reverts to normal
braking (without ABS interventions). Always repair ABS DTCs
at the earliest opportunity.

The tone ring size is defaulted to 100 teeth, and the tire-rolling
radius is defaulted to 511 revolutions per mile. Refer to Table
4 for parameter adjustments.

All ABS functions are completely disabled. The system reverts
to normal braking.

Tone Ring Size

Tire-Rolling Radius –
Allowable Range

60 teeth

712 to 1005