2

Ground

8

Sensor Signal, Front Axle Right

14

Sensor Signal, Rear Axle #3 Right

3

J1939 CAN High

9

Sensor Signal, Rear Axle #1 Left

15

Sensor Power Out (+5V),
Rear Axle #1*

4

J1939 CAN Low

10

Sensor Signal, Rear Axle #1 Right

16

Sensor Power Out (+5V),
Rear Axles #2 and #3*

5

Sensor Power Out (+5V),
Front Axle*

11

Sensor Signal, Rear Axle #2 Left

17

Sensor Ground, Rear Axle #1

6

Sensor Ground, Front Axle

12

Sensor Signal, Rear Axle #2 Right

18

Sensor Ground, Rear Axles #2 and #3

*5V sensor power out unused for End-of-Life (EOL) wear sensing applications.

Table 2 – Pin Assignments

6

PIN

TROUBLESHOOTING DIAGNOSTIC:
POWER SUPPLY

TROUBLESHOOTING DIAGNOSTIC: J1939
CAN COMMUNICATIONS

Possible symptoms that may indicate an issue with the
power supply include:

Possible symptoms that may indicate an issue with the
J1939 CAN communication include:

• Lack of Electronic Control Unit (ECU) function

• Lack of J1939 CAN communication

• Inconsistent ECU function

• Sporadic J1939 CAN communication

Perform the following to diagnose potential power supply
issues:

Perform the following to diagnose potential J1939 CAN
communication issues:

•

Take all measurements at the ECU harness connector.

•

Take all measurements at the ECU harness connector.

•

Check for damaged wiring and damaged or corroded
connectors and connections.

•

•

Place a load (i.e. an 1157 stop lamp) across ignition
and ground connection and measure the ignition
and battery voltage with the load. Ignition‑to‑ground
should measure between 9.0V to 18.0V. If the voltage
is outside of this range, proceed to the following steps.

Check for corroded or damaged wiring connector
problems such as opens or shorts to voltage or
ground.

•

Check for damaged or reversed J1939 wiring.

•

Check for other J1939 devices which may be bringing
down (inhibiting) J1939 communication.

•

Check the condition of the vehicle battery and
associated components.

•

Check the alternator output for excessive noise.

See Figure 5 and refer to Table 4.

See Figure 4 and refer to Table 3.

View from Back of Connector
PIN
View from Back of Connector
PIN

DESIGNATION

1

Ignition Power

2

Ground

Figure 4 – Power Supply Tests

Voltage
below 9V

Voltage
above
18V

POTENTIAL SOLUTION
•

Check the vehicle battery and associated
components.

•

Check for damaged wiring.

•

Check for damaged or corroded connectors
and connections.

•

Contact the OEM for further assistance.

•

Ensure the battery voltage is correct for the ECU.

•

Check vehicle battery and associated
components.

•

Check for damaged wiring.

•

Check for damaged or corroded connectors
and connections.

•

Contact the OEM for further assistance.

Table 3 – Power Supply Troubleshooting

3

J1939 High

4

J1939 Low

Figure 5 – J1939 CAN Communication Tests
ISSUE

ISSUE

DESIGNATION

ECU not identified
in Bendix® ACom®
Diagnostic
Software

POTENTIAL SOLUTION
•

Check for damaged or corroded
connectors and connections.

•

Check the ECU part number and confirm
it is configured to the correct baud rate.
Refer to B2Bendix.com.

•

Check for damaged or reversed J1939
wires or power/ground wires.

•

Using Bendix® ACom® Diagnostic
Software, check to see if the wearsensing ECU is broadcasting CAN
messages from a source address other
than 154 (9A).

•

Confirm ECU failure by installing an
ECU that has been verified to function
properly.

Table 4 – J1939 CAN Communication Troubleshooting
7

DIAGNOSTIC TROUBLE CODES (DTC) TABLE
Refer to Table 5, Figure 6, and the corresponding service action code in Table 6.

SPN
(J1939)

FMI
(J1939)

DTC NAME

DTC DESCRIPTION

1099

Front Axle, Left Wheel, Wear Sensor Shorted to Voltage

1100

Front Axle, Right Wheel, Wear Sensor Shorted to Voltage

1101

Rear Axle #1, Left Wheel, Wear Sensor Shorted to Voltage

1102
1103

3

Wear Sensor

Rear Axle #1, Right Wheel, Wear Sensor Shorted to Voltage
Rear Axle #2, Left Wheel, Wear Sensor Shorted to Voltage

1104

Rear Axle #2, Right Wheel, Wear Sensor Shorted to Voltage

1105

Rear Axle #3, Left Wheel, Wear Sensor Shorted to Voltage

1106

Rear Axle #3, Right Wheel, Wear Sensor Shorted to Voltage

1099

Front Axle, Left Wheel, Wear Sensor Shorted to Ground or Open Circuit

1100

Front Axle, Right Wheel, Wear Sensor Shorted to Ground or Open Circuit

1101

Rear Axle #1, Left Wheel, Wear Sensor Shorted to Ground or Open Circuit

1102
1103

4

Wear Sensor

Rear Axle #1, Right Wheel, Wear Sensor Shorted to Ground or Open Circuit
Rear Axle #2, Left Wheel, Wear Sensor Shorted to Ground or Open Circuit

1104

Rear Axle #2, Right Wheel, Wear Sensor Shorted to Ground or Open Circuit

1105

Rear Axle #3, Left Wheel, Wear Sensor Shorted to Ground or Open Circuit

1106

Rear Axle #3, Right Wheel, Wear Sensor Shorted to Ground or Open Circuit

Table 5 – Diagnostic Trouble Codes (DTCs)

8

GO TO
SERVICE
ACTION
CODE
LISTED IN
TABLE 6

A

B

NOTE: Unless otherwise specified, diagnostics should be
done with the vehicle ignition on and with the engine not
running.

Continuous Sensor
Harness Connector

End-of-Life Sensor
Harness Connector
PIN

DESCRIPTION

COLOR*

A

Signal

Black

B

Sensor Power

Yellow

C

Sensor Ground

Brown

*Color applies to sensor harnesses supplied by
Bendix or Knorr-Bremse.

Torque Spec: 1.0 - 1.1 N•m

Figure 6 – Bendix® iSense™ Pro Tractor Wear-Sensing Electronic Control Unit (ECU) Layout

9

SERVICE ACTION CODE TABLE
Refer to Table 6. As situations are remedied, active Diagnostic Trouble Codes (DTCs) can be cleared by removing and
re‑applying ignition power. Alternately, DTCs may be cleared by using a PC‑based diagnostic tool, such as Bendix®
ACom® Diagnostic Software.
Service
Action
Code

Troubleshooting Measure
1. Locate the Faulted Wheel-End Brake.
Disconnect the Continuous Sensor
Harness Connector and with a Digital
Multi-Meter (DMM), measure the DC
voltage between Pin A and Pin B
within the Continuous Sensor Harness
Connector.

Measured Voltage
• 0-4.5V – Signal line not shorted to power source.
Proceed to Step 5.
• 4.5-5.5V – Signal line shorted to sensor power.
Proceed to Step 2.
• > 5.5V – Signal line shorted to vehicle power.
Proceed to Step 5.

2. Locate the Faulted Wheel-End Brake.
Using a DMM in Continuity Check
Mode, check the continuity between
Pin A and Pin B within the Continuous
Sensor Harness Connector.

Continuity Measurement Results
• Continuity is Present: Short between sensor line and
sensor power confirmed.
o If secondary connectors are present between the
Electronic Control Unit (ECU) Connector and the
Continuous Sensor Harness Connector, proceed to
Step 3.
o If secondary connectors are not present between the
ECU Connector and the Continuous Sensor Harness
Connector, proceed to Step 4.
• Continuity is Not Present: Short not present between
sensor line and sensor power.
o Possible intermittent short. Check the entire run of
the harness between the ECU Connector and the
Continuous Sensor Harness Connector connected
to the Faulted Wheel-End Brake. If damaged wire
insulation is not found, proceed with replacing the
ECU with a known good ECU. If the problem persists,
further diagnostics are needed to locate the short. If
the problem ceases, then proceed with replacing the
ECU through warranty or aftermarket.

3. Locate the Faulted Wheel-End Brake
and follow the Continuous Sensor
Harness Connector to any
OEM-specific connectors between the
brake and the ECU Connector. Using a
DMM in Continuity Check Mode, check
the continuity between the Sensor
Power and Sensor Signal Pins at each
OEM-specific connector.

Continuity Measurement Results
• Continuity is Present: Short circuit confirmed in supply line.
Supply line must be replaced.
• Continuity is Not Present: Short not present in supply line.
Proceed to Step 4.

A

Table 6 – Service Action Codes

10

Action

Service
Action
Code

A

Troubleshooting Measure

Action

4. Locate the Bendix® iSense™ Pro
Electronic Control Unit (ECU) and
disconnect the ECU Connector.
Using a Digital Multi-Meter (DMM) in
Continuity Check Mode and referring
to Figure 3 and Table 2, check the
continuity between the Sensor Power
Out Pin corresponding to the axle
on which the Faulted Wheel End
resides and the Sensor Signal Pin
corresponding to the Faulted Wheel
End within the ECU Connector.

Continuity Measurement Results
• Continuity is Present: Short circuit confirmed in vehicle
harness. Short must be found and repaired.
• Continuity is Not Present: Short not present between
sensor line and sensor power.
o Possible intermittent short. Check the entire run of
the harness between the ECU Connector and the
Continuous Sensor Harness Connector connected
to the Faulted Wheel-End Brake. If damaged wire
insulation is not found, proceed with replacing the
ECU with a known good ECU. If the problem persists,
further diagnostics are needed to locate the short. If
the problem ceases, then proceed with replacing the
ECU through warranty or aftermarket.

5. Locate the iSense Pro ECU and
disconnect the ECU Connector. Using
a DMM in Continuity Check Mode,
check the continuity between Pin 1 and
the Sensor Signal Pin corresponding to
the Faulted Wheel End within the ECU
Connector.

Continuity Measurement Results
• Continuity is Present: Short circuit confirmed in vehicle
harness. Short must be found and repaired.
• Continuity is Not Present: Short not present between
sensor line and sensor power.
o Possible intermittent short. Check the entire run of
the harness between the ECU Connector and the
Continuous Sensor Harness Connector connected
to the Faulted Wheel-End Brake. If damaged wire
insulation is not found, proceed with replacing the
ECU with a known good ECU. If the problem persists,
further diagnostics are needed to locate the short. If
the problem ceases, then proceed with replacing the