NHTSA ID Number: 11022737
Manufacturer Communication Number: SD-03-1189_EN_004
TSB/Document Date: 2025-09-05
Summary
Service Data - Bendix
® Intellipark® Electronic Park Brake (EPB) System
Rollaway Mitigation not available
Auto Trailer Brake Release available
Power unit manual switch operation not available
Towed unit manual switch operation available
Towed Unit Solenoid or Wiring Harness
•
•
•
•
•
•
•
Towed unit fault displayed on LEDs
Power and towed unit status available on LEDs
Park Brake Release Interlock available on power
unit
Rollaway Mitigation available
Auto Trailer Brake Release not available
Power unit manual switch operation available
Towed unit manual switch operation not available
•
•
•
•
•
•
System fault displayed on LEDs
Power and towed unit status available on LEDs
Park brake release interlock available
Rollaway Mitigation available
Auto Trailer Brake Release available
Manual switch operation available
•
Vehicle Speed: Loss of Electronic Brake Control (EBC2)
or Cruise Control Vehicle Speed (CCVS)
Table 5 – Fallback Modes
17
Missing / Corrupted Input
Fallback Mode
J1939: All Data Lost
•
•
•
•
•
•
System fault displayed on LEDs
Power and towed unit park status is available
Park brake release interlock available
Rollaway Mitigation not available
Auto Trailer Brake Release not available
Manual switch operation available
Occupancy Sensors
(Driver Door Status)
(Passenger Door Status)
(SLS Input)
(Seat Belt Status - if applicable)
Input Missing, Input Stuck, Not Satisfied
•
•
•
System fault displayed on LEDs
Power and towed unit park status is available
Park brake release interlock prevents vehicle from
being unparked
Rollaway Mitigation not available
Auto Trailer Brake Release not available
Manual exhaust switch operation available
Manual deliver switch operation available when
moving
Power Unit Pressure Sensor
•
•
•
•
•
•
•
•
•
•
•
Power unit fault displayed on LEDs
Power unit park status not available
Towed unit park status available
Park brake release interlock available
Rollaway Mitigation is completely or
partially unavailable
Auto Trailer Brake Release available
Manual switch operation available
Towed Unit Pressure Sensor
•
•
•
•
•
•
•
Towed unit fault displayed on LEDs
Power unit park status available
Towed unit park status not available
Park brake release interlock available
Rollaway Mitigation available
Auto Trailer Brake Release not available
Manual switch operation available
Occupancy Sensor
(Wire Harness Resistor RA Open)
See Figure 9 for more details.
•
•
•
System fault displayed on LEDs
Power and towed unit park status is available
Park brake release interlock prevents vehicle from
being unparked
Rollaway Mitigation not available
Auto Trailer Brake Release not available
Manual exhaust switch operation available
•
•
•
Occupancy Sensor
(Wire Harness Resistor RA Shorted)
See Figure 9 for more details.
•
•
•
•
•
•
Occupancy Sensor
(Wire Harness Resistor RB Open)
See Figure 9 for more details.
•
•
•
•
•
•
Table 5 – Fallback Modes
18
System fault displayed on LEDs
Power and towed unit park status is available
Park brake release interlock prevents vehicle from
being unparked
Rollaway Mitigation not available
Auto Trailer Brake Release not available
Manual exhaust switch operation available
System fault displayed on LEDs
Power and towed unit park status is available
Park brake release interlock prevents vehicle from
being unparked
Rollaway Mitigation not available
Auto Trailer Brake Release not available
Manual exhaust switch operation available
Missing / Corrupted Input
Occupancy Sensor:
(Wire Harness Resistor RB Shorted)
See Figure 9 for more details.
Fallback Mode
•
•
•
•
•
•
Occupancy Sensor:
(No Wire Harness Resistors RA and RB Missing)
See Figure 9 for more details.
•
•
•
•
•
•
System fault displayed on LEDs
Power and towed unit park status is available
Park brake release interlock prevents vehicle from
being unparked
Rollaway Mitigation not available
Auto Trailer Brake Release not available
Manual exhaust switch operation available
System fault displayed on LEDs
Power and towed unit park status is available
Park brake release interlock prevents vehicle from
being unparked
Rollaway Mitigation not available
Auto Trailer Brake Release not available
Manual exhaust switch operation available
Table 5 – Fallback Modes
OPERATING THE INTELLIPARK-EQUIPPED
VEHICLE UNDER FAULTED CONDITIONS
It may be necessary to unpark with a faulted Intellipark
EPB system. If so, follow these initial steps:
If the Intellipark EPB system faults while driving, the driver
can continue their route.
•
Leave the wheel chocks in place.
•
Apply ignition power if necessary.
•
Apply vehicle battery power. Do not start the engine.
•
Observe the DECU.
If the system has faulted, the capability of the Intellipark
EPB system may be reduced. Drivers must not rely on
the Intellipark EPB system to automatically park the
vehicle. Drivers continue to be responsible for safe
and proper operation of the vehicle.
•
With the interlock satisfied, press the yellow switch to
release the parking brakes.
•
Parking with a faulted Intellipark EPB system requires
the following steps to ensure safety:
•
•
Stop on a level surface.
•
Shut off the engine and roll down the driver's window
so the exhaust of air from the parking brakes can be
heard.
Check dash gauges to ensure the air reservoirs are
fully depleted of air. If not, fan down the reservoirs, if
necessary, by repeatedly applying and releasing the
service brakes to automatically apply the spring brakes
on both the tractor and trailer.
•
•
Attempt to park the trailer (if able) by pulling the red
switch. Listen for the exhaust of air.
Once the air reservoirs are depleted of air, remove the
wheel chocks prior to starting the engine.
•
•
Attempt to park the tractor by pulling the yellow switch.
Listen for the exhaust of air.
Start the engine and stay in the driver’s seat as the air
reservoirs charge.
•
•
Fan down the air system until the reservoir pressure is
fully depleted in both primary and secondary circuits.
Confirm the air is fully depleted by checking the dash
gauges or opening the drain cocks on all reservoirs.
Use the service brakes to hold the vehicle stationary
in case the spring brakes unintentionally release as
air pressure builds.
•
Chock the wheels.
•
Remove the vehicle battery power if possible.
If the Intellipark EPB system is reporting a fault and the
vehicle must be operated, perform the following steps:
In case of emergency, the service brakes can be fanned
down by repeatedly applying and releasing the service
brakes to automatically apply the parking brakes on
both the tractor and trailer.
19
TROUBLESHOOTING - DIAGNOSTIC MODES
ELECTRICAL INTERFACE DETAILS
If the Intellipark EPB system is powered and is faulted, the
inner LEDs will blink. Loss of features is communicated
through either the vehicle instrument cluster or a standalone
integrated display. Diagnostic information is available by
interfacing with the Intellipark EPB system using the Bendix
ACom Diagnostic Software.
ACom is a PC-based program that is designed to meet
RP 1210 industry standards developed by the Truck
Maintenance Council (TMC). This software provides the
technician with access to all available Intellipark controller's
diagnostic information and configuration capability,
including:
See Figures 7 and 8 for the electrical interface details.
• Electronic Control Unit (ECU) information
• DTCs and repair information
PVM
PVM
J1939
Backbone
IGN
Primary
Battery
Stop Lamp Switch
(discrete option if
not available on
CAN)
Fuse Panel
GND
GND
Door Switch
(discrete option if
not available on
CAN)
Figure 7 – Towing Vehicle Variant
20
Passenger Door
Switch (discrete
option if not
available on CAN)
11
9
15
13
16
7
6
5
1
14
17
18
4
3
2
12
10
8
J1
11
9
7
2
3
4
14
1
8
6
13
12
10
J2
5
For additional troubleshooting support, go to B2Bendix.com
> Services & Support > Diagnostic Trouble Code Search.
11
9
15
13
16
7
6
5
14
1
17
18
4
3
2
12
10
8
J1
11
9
7
2
- Mixes well with conventional fluids
- Low-moisture formula provides excellent vapor lock...
- Ideal for hydraulic and disc brakes
- Provides an extra margin of safety in extreme braking...
- Mix of polyglycol ethers ensures hot brake-system operation...
- Excellent for ABS, disc and drum brake systems
- Delivers braking power when needed by avoiding a spongy...
- Both wet and dry boiling points exceed the minimum...
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TSB/Document ID: SD-03-1189_EN_004
Replacement Service Bulletin Number:
MFR Communication Date: 2025-08-28
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES
MFR Component System: Parking Brake
MFR Component Subsystem: Electronic Parking Brake Control
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