3. S
lowly reduce pressure at both reservoirs. The
LEDs on the red switch should start to blink prior
to the low air pressure warning as an indication
that your pressure is getting low. The trailer side
switch should trip when the supply pressure
drops to 45 - 20 psi.
4. A
fter the switch trips in the previous step, press
and hold the red switch while you continue to
reduce the supply pressure. Air should start to
escape from the exhaust port when the trailer
supply line pressure reaches a minimum of
20 psi.
N OTE: The tractor (yellow switch) side must not
trip before the trailer (red switch) side.
OTE: Close all reservoir drain cocks and
N
deliberately caused leakage points before
continuing operational tests.

Tractor (Red) and Trailer (Yellow) Park
1. W
ith full system pressure and all safety interlocks
satisfied, push both the red and yellow switches
and allow the brakes on the tractor and trailer to
release.
N OTE: If the Intellipark EPB system fails to
operate as described, repair or replace the
components using genuine Bendix parts.
VM Removal: Perform the following steps to remove
P
the PVM from the vehicle.

IMPORTANT
Refer to the General Safety Guidelines in this manual
before performing any service.
1. P
rior to removing a PVM, apply the parking
brakes and drain all the vehicle reservoirs.
2. Identify, mark, and disconnect all air lines to the
PVM. Push-to-connect fittings require the collar
to be pressed toward the valve body before the
nylon line can be pulled.
3. I
dentify, mark, and disconnect all electrical
connectors from the PVM.
4. R
emove the 5/16 or M8 bolts and remove the PVM
from the vehicle. Reuse of the mounting hardware
is acceptable.

8

VM Installation: Perform the following steps to install
P
the PVM into the vehicle.

IMPORTANT
The PVM must be mounted as described in this section
to minimize the possibility of accumulated debris on
the exhaust ports. The exhaust ports must have a
minimum of 1-in. clearance from all obstructions. The
exhaust ports must not be covered or painted over.
1. If replacing the PVM, use the same mounting
location and – if necessary – bracketry/mounting
hardware as installed by the OEM. The PVM is
designed to be secured to a bracket or the chassis
using either 5/16 or M8 bolts.
2. Install the PVM on the vehicle by tightening the
mounting bolts to 150-200 in.-lb (17-23 N•m).
3. Reconnect the air lines and electrical connectors.
4. C
harge the reservoirs. Check for operation and
leakage.
•

he integrated display monitors the Intellipark EPB
T
system and will notify the driver if an Intellipark
feature is active. When an Intellipark feature is active,
the integrated display will flash the acronym for that
respective feature.
»

ARA: Anti Rollaway (also known as Rollaway
Mitigation or Rollaway Intervention)

»

EAS: Exhaust-at-Speed

»

TBR: Trailer Brake Release

If a feature is faulted, along with the fault information,
the main screen will flash an “X” over the applicable
Intellipark feature acronym. If the feature is not
activated, the acronym will not display on the integrated
display. Because the Rollaway Mitigation (also known
as Rollaway Intervention) feature is time-dependent,
the number of seconds remaining until this feature
activates will display on the integrated display.
Additionally, the integrated display will inform the driver
to press their foot brake if the driver does not want to
activate Rollaway Mitigation.

Integrated Display: The Intellipark EPB system also
requires an integrated display to perform system
monitoring and driver information functions. The
integrated display may be provided by Bendix, or the
vehicle OEM may choose to use the instrument cluster
or another existing integrated display on the vehicle
to perform the necessary functions. The integrated
display is intended to provide the following functions:
»

»

ommunicate the status of the vehicle spring
C
brakes for solo (i.e. straight truck, bus) and
combination (i.e. tractor/trailer) vehicles during
normal use.

2

1

ommunicate the status of system interlocks to
C
assist the driver with park/unpark functions during
normal use.

»

Indicate to the driver that a driver assistance
feature is active or faulted.

»

lert the driver in instances when the Intellipark
A
system is offline (i.e. not transmitting on CAN).

»

rovide system availability information or driver
P
instruction information in instances when Intellipark
is functioning in a 'backup' mode.

5

3

PIN

OUTPUT

1

Do Not
Populate

2

VIN

3

GND

4

CAN +

5

CAN -

4

Figure 4 – Integrated Display and Pinouts
he integrated display brightness can be adjusted by
T
rotating the outer dial counterclockwise to decrease
brightness or clockwise to increase brightness. The
integrated display can also be turned all the way off
by rotating the dial counterclockwise until the screen
turns off. Once off, the integrated display will remain
off unless an issue is detected, or the driver requests
the integrated display turns on.
9

efer to Table 1 for examples of integrated display
R
icons. These icons are representative only and may
vary by OEM. The icons in Table 1 will appear on
the integrated display if the particular interlock is not
satisfied, and the driver will not be able to unpark
unless they satisfy the respective interlock. If multiple
interlocks are not satisfied, they will appear in this
priority:
»
»
»
»
»

Right Door
Left Door
Seat Belt
Ignition
Foot Brake

Interlock Signal Name

Integrated Display Icon Description

Tractor Air
Delivery Status

•P
arked: ISO symbol for parking brake (e.g. "P") overlaid on a tractor
icon.
•U
nparked: "P" absent from tractor icon.
• If the tractor air deliver status cannot be determined due to a fault, an
“X” will flash once per second on the "P" symbol.

Trailer Air
Delivery Status

•P
arked: ISO symbol for parking brake (e.g. "P") overlaid on a trailer
icon.
•U
nparked: "P" absent from trailer icon.
• If the trailer air deliver status cannot be determined due to a fault, an
“X” will flash once per second on the "P" symbol.

SLS_Status

The foot brake interlock is not satisfied and is needed to unpark; press
the foot brake to unpark the vehicle.

Ignition_Status

Key interlock is not satisfied and is needed to unpark the vehicle; key
on the vehicle to unpark the vehicle.

OCC2_Status

The left vehicle door interlock is not satisfied and is needed to unpark
the vehicle; close the left door to unpark the vehicle.

OCC1_Status

The right vehicle door interlock is not satisfied and is needed to unpark
the vehicle; close the left door to unpark the vehicle.

Table 1 – Integrated Display Icon Examples

10

Icon Example

SPECIAL MODES OF OPERATION

OTE: The next steps should be performed within 90
N
seconds.

The Intellipark EPB system can operate outside the
standard operating mode to accommodate situations such
as maintenance, bob-tail, installation, etc.
•

1. P
ull the yellow DECU switch for three seconds,
then release the switch back to the neutral position.

Interlock Override Mode: Interlock Override (aka
Limp Home Mode) is intended to allow a driver to
operate a vehicle that has a failure in one of the inputs
to the park brake release interlock (e.g.: if the door
sensor has faulted, this mode allows the driver to
override that fault to drive the truck). A vehicle requiring
this mode should be serviced as some features of the
Intellipark EPB system may not be available.

2. K
eep the DECU switch in the neutral position for
three (3) seconds.

OTE: If the park brakes are released while performing
N
the switch pattern, the entry sequence will be aborted
and you will have to restart.

6. P
ush the switch for 20 seconds (continue holding
until you see the special blink pattern start).

or vehicles with a software version of BX23XXX or
F
later, the following conditions must be met to enter the
interlock override mode:
OTE: The next steps should be performed in less
N
than approximately 20 seconds.
1. Turn the ignition key ON.
2. F
ully press and release the yellow tractor parking
brake switch consecutively four (4) times.
3. O
n the fifth switch, press and hold the yellow
tractor parking brake switch for approximately five
(5) seconds.
or vehicles with a software version prior to BX23XXX,
F
the following conditions must be met to enter the
interlock override mode:
1. Verify that the vehicle is stationary and parked.
2. Turn the ignition key ON.

3. P
ush the DECU switch for three (3) seconds, then
release the switch back to the neutral position.
4. T
urn the ignition key to OFF, then back ON within
five (5) seconds.
5. Repeat steps 3-6 two (2) more times.

•

Vehicle Maintenance Mode: Vehicle maintenance
mode allows maintenance or service personnel to
ensure that the Intellipark EPB system will not change
from its current state and all advanced features shall
be disabled (e.g.: Rollaway Mitigation, Auto Trailer
Brake Release, etc.). Vehicle maintenance mode is
only intended for use when the vehicle is in a controlled
workshop environment and has been secured from
rolling.
nce the Intellipark EPB system has entered vehicle
O
maintenance mode, it will remain in its current state
regardless of switch input. For example, if the Intellipark
EPB system is unparked and the DECU is placed into
the vehicle maintenance mode, the Intellipark EPB
system will remain in the unparked state, even if the
red and yellow switches on the DECU are pulled.

While in vehicle maintenance mode, the wheels must
be chocked as the system will not change state
(unparked to parked). Failure to chock the wheels
could lead to vehicle damage, property damage, injury,
and/or death.

11

The Bendix® ACom® Diagnostic Software can be used
to place the DECU into the maintenance mode. The
software will require that the vehicle is stationary, and
certain other conditions must be met. Once vehicle
maintenance mode has been entered, the integrated
LED display will blink a unique pattern – two (2) times
in one (1) second, then be off for one (1) second – for
the duration of the cycle.
he DECU will exit the vehicle maintenance mode
T
when any of the following conditions are met.
»

The DECU detects steer axle wheel speeds

»

Com Diagnostic Software is used to send a
A
command to the DECU to exit vehicle maintenance
mode

fter successfully meeting the preconditions, the below
A
pattern will put the vehicle into maintenance mode:
1. R
elease the park brakes (if the desired state is
RELEASED while the system is in maintenance
mode).
2. V
erify that the vehicle is stationary, the ignition key
is ON, and the DECU switches are in the neutral
position.
NOTE: The next steps should be performed within 10
seconds.
3. Press the foot brake pedal.
4. Release the foot brake pedal.

»

The battery power cycle is performed

5. P
ush the yellow button and hold it in the pushed
state continuously (until the end of step 15).

»

he following switch pattern is performed
T
successfully

6. P
ress the foot brake pedal and keep it pressed
(until the end of step 15).

he Intellipark EPB system also provides a method to
T
enter and exit vehicle maintenance mode without using
ACom Diagnostic Software. Entry is accomplished
by using a predefined sequence of inputs that is
sufficiently unique to prevent accidental entry, and
sufficiently inconvenient to discourage inappropriate
use of the mode, while still allowing access to the
mode for emergency conditions or at remote locations.

NOTE: The next steps should be performed within 40
seconds.

ntry to the vehicle maintenance mode via the switch
E
pattern shall only be possible when all preconditions
are met.

7. C
ycle the ignition key from fully ON to fully OFF
three times.
» ON > OFF > ON > OFF > ON > OFF
8. K
eep the ignition switch in the OFF position for at
least two seconds.
9. Cycle the ignition key from OFF to ON three times.
» OFF > ON > OFF > ON > OFF > ON

»

Battery voltage is normal

»

Ignition key is on

10. K
eep the ignition switch in the ON position for at
least two seconds.

»

Vehicle speed is < 4 mph (6 kph)

11. Cycle the ignition key from ON to OFF three times.
» ON > OFF > ON > OFF > ON > OFF
12. K
eep the ignition switch in the OFF position for at
least two seconds.
13. Cycle the ignition key from OFF to ON three times.
» OFF > ON > OFF > ON > OFF > ON
14. K
eep the ignition switch in the ON position for at
least two seconds.
15. V
erify that the diagnostic LEDs start to blink in the
special pattern.

12

•

Bobtail Mode: When the towed unit channel of the
Intellipark EPB system is evacuated, the two red LED
displays on the trailer air supply (red) switch will be
illuminated. This is a normal operation scenario for
vehicles that are equipped for towing but are used
without a trailer (bobtail). Bobtail mode gives the driver
the ability to extinguish the two red LED displays on the
trailer air supply switch when driving bobtail.

•

he following conditions must be met to enter the
T
bobtail mode:
»

he driver must release the tractor (power vehicle)
T
park brakes.

»

The vehicle must be below a configurable speed.

»

he PVM trailer (towed vehicle) pressure sensor
T
reading must be below a configurable pressure.

»

he driver must pull and hold the red trailer air
T
supply switch for a minimum of three seconds.