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
•
Towing an Intellipark-Equipped Vehicle: In the event
an Intellipark-equipped vehicle must be towed, there
are two (2) ways to tow the vehicle:
»
Mechanically cage the spring brakes.
»
ut the truck into vehicle maintenance mode
P
which will prevent the vehicle from changing state
(unparked to parked or parked to unparked). The
front axle must be raised, otherwise the vehicle
will exit maintenance mode.
Vehicle Configurations: The Intellipark system
provides parking capability for commercial vehicles
(tractors, trucks, and buses) that utilize air brakes. It
is available in various models to support a wide range
of applications. See Figures 5 and 6 for examples
of conceptual installations and connectivity of the
Intellipark EPB systems units on different vehicle
configurations.
he DECU will exit the bobtail mode when any of the
T
following conditions are met:
»
he vehicle ignition power is removed and
T
re-applied.
»
he driver applies the tractor (power vehicle) park
T
brakes.
»
he vehicle experiences a Rollaway Mitigation
T
event.
»
Diagnostic Trouble Code (DTC) occurs that
A
inhibits Bobtail Mode.
Figure 5 – Conceptual Schematic: Solo Truck or Solo
Bus
Figure 6 – Conceptual Schematic: Tractor
13
OPERATIONAL CONDITIONS: NORMAL
The LEDs on the DECU are one indicator the Intellipark
EPB system is performing under normal operating
conditions. Refer to the applicable Operator's Manual on
B2Bendix.com for interlocks and all parking and unparking
operation.
LED Operation
LED1
LED2
LED3
LED4
Status
On
On
On
On
All LEDs illuminate for three (3) seconds when ignition is applied.
On
On
On
On
All LEDs remain illuminated for a minimum of three (3) minutes after
ignition key is off.
On
On
On
On
Three (3) seconds after ignition is applied, and both the power
vehicle and the towed vehicle are parked.
Off
Off
Off
Off
Three (3) seconds after ignition is applied, and both the power
vehicle and the towed vehicle are unparked.
On
On
Off
Off
The towed vehicle is parked, and the power vehicle is unparked.
Off
Off
On
On
The towed vehicle is unparked and the power vehicle is parked.
Blinking
Blinking
Blinking
Blinking
A Rollaway Mitigation event has occurred for both the tractor and the
trailer.
On
On
Blinking
Blinking
A Rollaway Mitigation event has occurred for the tractor only or the
tractor pressure sensor is faulted.
Table 2 – DECU LED Operations - Normal Conditions
LED 1
14
LED 2
LED 3
LED 4
Refer to Table 3 for the Intellipark EPB system's performance
under normal operating conditions.
Switch
Driver Action
Intellipark EPB
System Reaction
Spring Brake
Reaction
Vehicle Parking
State
Trailer Air Supply
Pushes Red Switch
Applies air to the
trailer supply gladhand through the
Tractor Protection
Valve (TPV)
Towed vehicle spring
brakes are released
Towed vehicle is
unparked
Pushes Yellow
Switch
Applies air to the
power unit spring
brake system
Power vehicle spring
brakes are released
Power vehicle is
unparked
Trailer Air Supply
Pulls Red Switch
Exhausts air from
the trailer glad-hand
through the TPV
Towed vehicle spring
brakes are applied
Towed vehicle is
parked
Parking Brake
(DECU Towing
Variant)
Pulls Yellow Switch
Exhausts air from
the power unit spring
brake system and the
trailer supply gladhand through the
TPV
Power vehicle spring Vehicle combination
brakes and the towed is parked
vehicle spring brakes
are applied
Parking Brake
(DECU Non-Towing
Variant)
Pulls Yellow Switch
Exhausts air from
the power unit spring
brake system
Power vehicle spring
brakes are applied
Power vehicle is
parked
Table 3 – Operation Under Normal Conditions
15
If the Intellipark EPB system has a fault, one indicator will
be the LEDs on the DECU as shown in Table 4. For specific
fault details, refer to the DTC Search on B2Bendix.com.
NOTE: Blinking indicates a continuously blinking LED
independent of any driver input (e.g. button push or pull,
ignition cycle, etc.).
LED Operation
LED1
LED2
LED3
LED4
Status
On
Blinking
On
On
A fault is present on the towed vehicle park brake system. Both the
towed vehicle and the power vehicle are parked.
Off
Blinking
Off
Off
A fault is present on the towed vehicle park brake system. Both the
towed vehicle and the power vehicle are unparked.
On
On
Blinking
On
A fault is present on the power vehicle park brake system. Both the
towed vehicle and the power vehicle are parked.
Off
Off
Blinking
Off
A fault is present on the power vehicle park brake system. Both the
towed vehicle and the power vehicle are unparked.
Off
Blinking
Blinking
Off
A fault is present on both the power and towed vehicle park brake
system. Both the towed vehicle and the power vehicle are unparked.
On
Blinking
Blinking
On
A fault is present on both the power and towed vehicle park brake
system. Both the towed vehicle and the power vehicle are parked.
Off
The system is unparked. First, the driver should pull the button to
ensure it is not a Rollaway Mitigation event. If the blinking persists, a
fault with the towed vehicle PVM pressure sensor has been detected.
Both LEDs blinking indicates the state of the Intellipark towed vehicle
system cannot be determined by the DECU. Immediately chock the
wheels and have the system serviced as soon as possible.
Blinking
The system is unparked. First, the driver should pull the button to
ensure it is not a Rollaway Mitigation event. If the blinking persists, a
fault with the power vehicle PVM pressure sensor has been detected.
Both LEDs blinking indicates the state of the Intellipark towed vehicle
system cannot be determined by the DECU. Immediately chock the
wheels and have the system serviced as soon as possible.
On
The system is parked. First, the driver should pull the button to ensure
it is not a Rollaway Mitigation event. If the blinking persists, a fault
with the towed vehicle PVM pressure sensor has been detected.
Both LEDs blinking indicates the state of the Intellipark towed vehicle
system cannot be determined by the DECU. Immediately chock the
wheels and have the system serviced as soon as possible.
Blinking
Off
Blinking
Blinking
Off
Blinking
Off
Blinking
On
On
On
Blinking
Blinking
The system is parked. First, the driver should pull the button to ensure
it is not a Rollaway Mitigation event. If the blinking persists, a fault
with the power vehicle PVM pressure sensor has been detected.
Both LEDs blinking indicates the state of the Intellipark towed vehicle
system cannot be determined by the DECU. Immediately chock the
wheels and have the system serviced as soon as possible.
Off
On
On
Off
An internal DECU fault has been detected. Immediately chock the
wheels and have the system serviced as soon as possible. Replace
the DECU.
Table 4 – DECU LED Operations - Faulted Conditions
16
Refer to Table 5 for the Intellipark EPB system's fallback
modes.
Missing / Corrupted Input
Fallback Mode
Ignition: Loss of Input
•
•
•
•
•
•
•
•
System fault displayed on LEDs
DECU power-up via CAN wake-up
LED power-up check not performed
Park brake release interlock available
Rollaway Mitigation available
Auto Trailer Brake Release available
Manual switch operation available
Ability to detect complete loss of J1939 degraded
Battery: Voltage Out of Range
•
•
•
•
•
•
•
System fault displayed on LEDs (if voltage supports
DECU operation)
8 - 9 V or >18 V: Automatic protection of solenoids
via shutdown of output circuits
Status display available on LEDs
Park brake release interlock not available
Rollaway Mitigation not available
Auto Trailer Brake Release not available
Manual switch operation not available
< 8V: DECU shutdown
Battery: Loss of One Output
•
•
•
System operates using remaining input
All features available
System fault displayed on LEDs
Red / Yellow Switches
•
•
•
•
•
•
System fault displayed on LEDs
Power and towed unit status available on LEDs
Park brake release interlock not available
Rollaway Mitigation not available
Auto Trailer Brake Release not available
Manual switch operation not available
Power Unit Solenoid or Wiring Harness
•
•
•
•
•
•
•
Power unit fault displayed on LEDs
Power and towed unit status available on LEDs
Park brake release interlock available on towed unit
- 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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