Prevost Aware Adaptive Cruise Braking (ACB) FLR20 & FLR21 Radar Sensor Alignment – 2014-2019 Prevost

SEOCONTENT-START

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MAINTENANCE
INFORMATION
Mi14-34D
DATE : MAY 2014 SECTION: 23 – Accessories
SUBJECT : PREVOST AWARE ADAPTIVE CRUISE BRAKING
(ACB)  FLR20 & FLR21 RADAR SENSOR
ALIGNMENT
THIS MAINTENANCE INFORMATION SUPERSEDES PREVIOUS VERSION.
REVISION D Added: FLR21.
APPLICATION
Model VIN
All
Equipped with Prevost AWARE Adaptive Cruise Braking system
From
H3 Series: 2PCVS3493EC712660 incl.
X3 Series: 2PCG33496EC735694 incl.
DESCRIPTION
Prevost AWARE Adaptive Cruise Braking (ACB) is an optional cruise control that adds an additional
mode of operation to conventional speed controls, familiar to most drivers of passenger cars. This mode
is called distance control. Distance control adjusts the speed of the vehicle to maintain a constant
following interval (distance) to the vehicle ahead. Using a radar sensor mounted to the front bumper, the
ACB system measures the distance between the coach and the forward vehicle.
If the radar sensor becomes misaligned (or any other system problem is detected) a pop-up message will
show on the DID to notify the driver that service is needed.
If a radar fault condition appears, one of the following pop-up messages will show in the DID.
ACB RADAR MISALIGNMENT ACB RADAR DATA LINK FAILURE
ACB RADAR FAULT ACB RADAR BLOCKED
The first step to go through when a customer complains about false alarms or bad system performance is
to check the radar sensor alignment.
NOTE
The maximum radar range is approximately 500 feet (150 meters). Rain, snow, fog, ice and
other severe weather conditions may affect the performance of the ACB system and shorten
radar range. Should the radar sensor be blocked with ice, snow or other foreign matter, the
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pop-up message ACB RADAR BLOCKED will show on the DID.
The ACB radar sensor is pre-aligned at the factory and no adjustment should be needed. It will not
function properly if misaligned after a collision. Information may appear on the DID to let you know if the
sensor is misaligned. Realigning the radar sensor requires a qualified technician, the radar sensor
alignment tool and the present procedure.
MATERIAL NEEDED
CANADA: adjustment tool #685592 (for FLR20 & FLR21 radar sensor). See the image below for the list
of components.
USA: adjustment tool kit #7770168 (for FLR20 & FLR21 radar sensor): See the image below for the list of
components.
Part #685592 or kit #7770168 includes:
1 – adjustment tool Qty: 1
2 – steel clip Qty: 1
3 – digital inclinometer Qty: 1
4 – laser Qty: 2
5 – cap screw ¼-20UNC X 3/8 (not visible) Qty: 2
PROCEDURE
DANGER
Park vehicle safely, apply parking brake, stop engine and set battery master switch(es) to the OFF
position prior to working on the vehicle.
Part 1 CHECKING MISALIGNMENT VALUE USING BENDIX ACom SOFTWARE
NOTE: part 1 is optional, you can start with part 2 if ACom is not available
1. On Google, search for « Bendix ACom diagnostics software ».
2. Download the latest version of Bendix ACom Diagnostics® software on your laptop.
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3. Launch Bendix ACom Diagnostics®.
4. Select Wingman CAN TP20 and then click on Start
with ECU.
Fig.1
5. Select your type of connection (USB-Link) and then
click on Open.
Fig.2
6. To check the Misalignment Value, select Controller
Configuration.
If the Misalignment Value is within -0.8deg and
+0.8deg, no alignment is necessary.
In this case, refer to TROUBLESHOOTING at the en
of this document to help determine the cause of
potential issues.
ALIGNMENT VALUE RANGE
No Adjustment Needed if:
-0.8 deg ≤ Misalignment Value ≤ +0.8 deg
Fig.3
Re-align the radar sensor vertically and horizontally if:
 The system seems to track or warn on vehicles in adjacent lanes.
 The cruise control is not available and the ACB system telltale is illuminating steady in red and
the following message shows in the DID: ″ACB RADAR MISALIGNMENT″.
 The system seems to not “see” as far as it “used to”, or warn on many more overhead
bridges/signs than previously.
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Part 2 PREPARATION
7. Park the coach on a level surface. The
suspension must be at normal ride height.
8. H3 Series: Open the reclining bumper and
install the steel clip (#688078) over the radar
sensor (fig.4 & 5). Steel clip must lean flat on
the radar sensor.
9. H3 Series: Close reclining bumper.
FIG.4 : STEEL CLIP #688078
FIG.5 : H3 SERIES – STEEL CLIP INSTALLED ON RADAR
SENSOR
10. X3 Series: Open the reclining bumper and
remove the radar sensor access panel (fig.6).
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FIG.6 : X3 SERIES – RADAR ACCESS PANEL
11. X3 Series: Install the steel clip (#688078) over
the radar sensor (fig.7). Steel clip must lean flat
on the radar sensor.
12. X3 Series: Close reclining bumper.
FIG.7
Part 3 VERTICAL ALIGNEMENT USING DIGITAL INCLINOMETER
13. Press the digital angle gauge ON/OFF button.
Follow the manufacturer’s instructions if needed.
FIG.8
14. Set the digital inclinometer flat on a horizontal
baggage compartment member. Place the
digital inclinometer as shown on figure 9.
15. Press the ZERO button to set the gauge to
0.0°. LCD display will show 0.0°.
FIG.9
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16. Place the digital inclinometer on the steel clip
as shown on figure 10.
FIG.10
17. Screw A serves as vertical adjustment screw.
Use a Torx T-20 screwdriver to turn by hand
the top-left adjustment screw (screw A). During
the adjustment, observe the digital display on
the inclinometer and turn the vertical alignment
screw A clockwise or counterclockwise
depending on the vertical direction (up or
down) needed, until the reading is
90.0°±0.2°. (see figures 11 & 12).
FIG.11
FIG.12
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Part 4 HORIZONTAL (lateral) ADJUSTMENT
18. On the bumper, define two reference points located vertically from the headlamps and at the same
height as shown on figures 13 & 14. Later in this procedure, the distance between the bumper
surface at these reference points and the laser bean will be measured and then adjusted to be equal
on both sides.
FIG.13
FIG.14
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19. Remove the digital inclinometer from the
steel clip.
20. Passing through the opening in the bumper,
fix the alignment tool on the steel clip using
the magnetic mounts at the end of the three
extensions (fig.15).
FIG.15
21. Turn on each laser and select the flat beam
type.
22. Using a measuring tape, measure distance
between the laser beam and the bumper at
the reference point. For a perfect alignment,
this measure should be equal on both sides.
The radar horizontal adjustment is within
tolerances if the difference between both
measurements does not exceed 19/32″
(15mm)
FIG.16
23. Screw B serves as horizontal adjustment
(lateral) screw (fig.17 & 18). Use a Torx T-
20 screwdriver to turn by hand the lowerright
adjustment screw (screw B). Turn
screw B clockwise or counterclockwise
depending on direction needed in order to
have the same measurement on both sides
preferably.
FIG.17
FIG.18
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Part 5 ROAD TEST
24. Perform a 30 minutes road test to evaluate the ACB behavior.
FOR FURTHER DETAIL ABOUT TROUBLESHOOTING FLR20 RADAR SENSOR ISSUES, CONSULT
« BENDIX SD-61-4960 WINGMAN ADVANCED FLR20 SENSOR ».
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TROUBLESHOOTING
TROUBLESHOOTING BASICS
QUESTIONS TO DRIVER NEXT STEPS
Have the driver run the
Power-Up Self-Test.
Power-up Self-Test
This is a self-diagnostic check, to determine if the system operation is
normal.
1. Park the vehicle. Power off.
2. Put the key into the ignition, and turn to the “ignition power”
position.
3. Toggle the cruise control switch at least once, and leave it in the
“on” position.
4. Start the vehicle, but do not drive away.
Note that if the cruise control is in the “off” position, or if the
vehicle is moving, this test will not run.
5. The self-test will start after 15 seconds, and takes approximately
five (5) seconds to complete.
To repeat a second self-test, turn the ignition OFF then repeat
procedure above.
Note that other vehicle system self-tests, e.g. the ABS “chuff” test,
may run during the initial 15 seconds after ignition “ON”.
As the ACB system self-test runs, the driver should hear a short set of
beeps. The test checks the engine, transmission, and brake systems
to make sure they are communicating. In addition, depending on the
vehicle, the test may briefly display a distance alert message and/or
cause the Forward Vehicle Detected icon in the instrument cluster to
illuminate; this is normal.
Does the driver hear a long
warning beep?
If no problem is found and the test is passed, no additional
beeps/lamps will be displayed nor will a trouble code be set.
If the system has found an issue that will prevent it from functioning
properly, a long warning beep will sound to alert the driver, and a
Diagnostic Trouble Code (DTC) will be logged in the system (typically
with a message in the DID). Look for Diagnostic Trouble Code (DTC)
using Bendix ACom software.
For descriptions of all DTCs, see Section 4.3: Diagnostic Trouble
Codes in « BENDIX SD-61-4960 WINGMAN ADVANCED FLR20
SENSOR ».
Have the driver describe the
system behavior that they
believe shows it is not working
properly.
When diagnosing the system, especially in cases where there are no
diagnostic trouble codes logged, find out which part of the system
behavior appears to be operating improperly.
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NARROWING DOWN THE PROBLEM
Use the questions found in the table below to help assess if the ACB system is not performing correctly.
Be sure to have a thorough understanding of the system’s normal behavior; this will reduce the
troubleshooting time. The table provides a guide to basic troubleshooting questions and possible
corrective actions. Consult « BENDIX SD-61-4960 WINGMAN ADVANCED FLR20 SENSOR » service
literature for more details.
QUESTION NEXT STEPS
Alignment Problems
Is the radar sensor mounting
location (bumper or cross
member) damaged?
• Does the system seem to
lose, or “not hold on to,” the
forward vehicle when going
around curves?
• Does the system seem to
warn on vehicles in adjacent
lanes?
• Are there false alerts when
passing other vehicles?
• Does the system seem to
warn late when another
vehicle cuts in front of the
truck?
• Does the system seem to
not “see” as far as it “used
to”, or warn on many more
overhead bridges/ signs than
previously?
• Does the system seem to
be inconsistent when
tracking forward vehicles?
Re-align the radar sensor vertically and laterally.
Blocked Radar Sensor
Issues
Is mud, ice, or snow
covering the radar sensor ?
Is anything blocking the view
of the radar sensor ?
Clean the radar sensor front surface immediately. Remove anything
blocking the radar sensor then power cycle and read any remaining
trouble codes.
If the vehicle’s cruise control is set and the radar sensor is blocked by
ice, snow, mud, tampering, etc. so that it cannot “see” a forward vehicle,
the ACB system may log a diagnostic trouble code (DTC).
After the blockage is removed, the DTC will clear automatically when the
vehicle’s ignition is cycled.
Add a visual check of the radar sensor for blockage to the driver’s pretrip
inspection checklist.
Potential False Warnings
Do false alerts seem to
happen in construction
zones or going under
bridges?
Several road scenarios have a tendency to cause false warnings,
including construction zones and bridges. Unless these false warnings
are frequent, the system is likely reacting normally. The driver should not
set the cruise control in construction zones. If driver complaints persist,
continue asking questions to more narrowly define the driving condition
presenting the problems. Review proper operating conditions in the
operator’s manual.
Mounting Problems
Is the radar sensor mounting
location (bumper or crossmember)
damaged?
Re-align the radar sensor vertically and laterally. Use the following
procedures:
• Inspect the radar mounting. A solid mounting surface is necessary in
order to hold the alignment. If the bumper or mounting cross-member is
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• Does the system seem to
not “see” as far as it “used
to”, or warn on many more
overhead bridges/signs than
previously?
damaged, replace it first, then align the radar sensor. Consult « BENDIX
SD-61-4960 WINGMAN ADVANCED FLR20 SENSOR ».
• Appendix B1 – Go to Appendix B1 and use the flowchart to find out the
procedure needed. Follow the actions directed in the procedure and
align the radar.
• Appendix B4 – Check the vertical alignment and adjust if needed.
Does the mounting bracket
look damaged or tampered
with?
Other than expected surface scratches or some discoloration over time,
there should be no visible damage to the radar sensor bracket assembly.
If so, realign the radar sensor vertically and laterally. If radar sensor
alignment cannot be held in place, the bracket assembly must be
replaced. Verify the bumper is not damaged.
The Radar Sensor Mounting – The radar sensor needs a solid mounting
surface in order to hold the alignment. If the bumper or mounting crossmember
is damaged, replace it first, then align the radar sensor.
Other questions
Has the system worked
properly in the past and is
not working correctly now?
This is a good indication that something has changed; review the
questions listed above with the driver to further diagnose the problem.
Does the mounting bracket
look damaged or tampered
with?
Other than expected surface scratches or some discoloration over time,
there should be no visible damage to the radar sensor bracket assembly.
If so, realign the radar sensor vertically and laterally. If radar sensor
alignment cannot be held in place, the bracket assembly must be
replaced. Verify the bumper is not damaged.
• Check the Vertical Alignment (6.07) and adjust if needed.
• Check the Lateral Alignment (6.09) and adjust if needed.
The Radar Sensor Mounting – The radar sensor needs a solid mounting
surface in order to hold the alignment. If the bumper or mounting cross
member is damaged, replace it first, then align the radar sensor.
With cruise control set, does
the system consistently
apply the foundation brakes
when a forward vehicle
slows?
This is normal operation. Continue asking the driver questions to
determine if the radar system interventions are not the expected ACB
system behavior. If the radar system interventions are not typical, the
radar sensor may be misaligned.
• Inspect the radar mounting. A solid mounting surface is necessary in
order to hold the alignment. If the bumper or mounting cross-member is
damaged, replace it first, then align the radar sensor.
Consult « BENDIX SD-61-4960 WINGMAN ADVANCED FLR20
SENSOR ».
• Appendix B1 – Go to Appendix B1 and use the flowchart to find out the
procedure needed. Follow the actions directed in the procedure and
align the radar.
• Appendix B4 – Check the vertical alignment and adjust if needed.
The service technician will need to check trouble codes as well. Read
Section 4.3: Diagnostic Trouble Codes.
Does the system seem to
disengage after an automatic
braking event?
This is normal operation. The driver must set or “resume” the cruise
control once again to regain the following distance function.
Does cruise control
disengage sometimes when
the brakes come on and not
at other times?
This is normal operation. When traveling with lightly loaded trailers, or
“bobtail”, the adaptive cruise control with braking feature of Wingman
Advanced may continue to function even after an automatic brake
application. No driver input is needed.
Does the connector or wiring
appear damaged?
Wires can become corroded if the radar sensor is not plugged in
properly. Clean the connectors on the wire harness, as well as the radar
sensor, and reattach. If wires are chafed, replace the wire harness. Also,
check for trouble codes using Bendix ACom software.
Read Section 4.3: Diagnostic Trouble Codes, and
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Section 4.8: Troubleshooting Wiring Harnesses in « BENDIX SD-61-
4960 WINGMAN ADVANCED FLR20 SENSOR ».
Does the system generate a
diagnostic trouble code
going down a grade when
using ACB to slow the
vehicle, but the code
goes away later?
This is normal operation. The adaptive cruise control with braking feature
of Wingman Advanced is not intended to be used on grades. Verify there
are no diagnostic trouble codes. Proper downgrade driving techniques
should be used.
Read Section 4.3: Diagnostic Trouble Codes of « BENDIX SD-61-4960
WINGMAN ADVANCED FLR20 SENSOR ».
Does the radar sensor have
noticeable damage beyond
normal discoloration or surface
scratches?
The radar sensor and bracket are very durable. However, if the radar
sensor housing or cover is cracked or broken, immediately look for
trouble codes via a current version of Bendix ACom and replace the
damaged radar sensor. Read Section 4.3: Diagnostic Trouble Codes,
and Appendix A.02: Radar Sensor Mounting in « BENDIX SD-61-4960
WINGMAN ADVANCED FLR20 SENSOR ».
OVERVIEW OF POSSIBLE ISSUES
Some customer issues are actually misunderstandings of how the ACB system performs normally. Use
the table below to learn the causes of potential issues if the ACB system is not performing correctly.
Some issues can be investigated by a visual inspection. Others may cause a diagnostic trouble code
(DTC) to be logged: See Section 4.3: Diagnostic Trouble Codes. Consult « BENDIX SD-61-4960
WINGMAN ADVANCED FLR20 SENSOR » for further details.
ISSUE DESCRIPTION
System familiarity Verify the system functionality. Is it operating normally or not? Drivers
who are unfamiliar with the system may report dissatisfaction over the
way it beeps or how it activates the brakes. Use Section 3.0:
Introduction to Troubleshooting, Section 4.3: Diagnostic Trouble
Codes and Section 3.1: Troubleshooting Basics to verify if the system
is functioning normally; then continue.
DTCs caused by
temporary operating
conditions
Some Diagnostic Trouble Codes (DTCs) indicate a temporary
condition and will clear when that condition is no longer present. If
these persist, further investigation is warranted. See Section 3.1:
Troubleshooting Basics in « BENDIX SD-61-4960 WINGMAN
ADVANCED FLR20 SENSOR ».
Radar sensor
misalignment
Inspect the front of the vehicle. If (a) it has been damaged, or (b) if the
vehicle does not track straight, either of these conditions must be
repaired before troubleshooting the ACB system. If there is a DTC set
or if the system does not function, the radar sensor may be severely
misaligned and the ACB system will not operate until this is corrected.
See Appendix B – Bendix Wingman Advanced Radar Alignment in
« BENDIX SD-61-4960 WINGMAN ADVANCED FLR20 SENSOR ».
Radar sensor
blocked
If the system doesn’t seem to work at all, the radar sensor may
possibly be blocked. A DTC will also be set. Visually inspect it, clear
the blockage, turn the ignition on and run through a power cycle. See
Appendix A3 for more information about radar mounting clearance in
« BENDIX SD-61-4960 WINGMAN ADVANCED FLR20 SENSOR ».
Vehicle diagnostic
trouble codes
(DTCs)
The ACB system will not operate and will set a DTC if any of the
following vehicle systems also show a DTC: engine, engine cruise,
instrument cluster, Bendix® ABS, Bendix® ATC, Bendix® ESP, or
transmission. These components must be repaired and cleared of
DTCs before troubleshooting the ACB system. (NOTE: Clearing the
vehicle DTCs may be the only step needed to reestablish full ACB
system functionality. See Section 4.4: Clearing Diagnostic Trouble
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Codes (DTCs) in « BENDIX SD-61-4960 WINGMAN ADVANCED
FLR20 SENSOR ».
Damaged radar
sensor or bracket
If the vehicle has been in an accident, it is likely the radar sensor will
need to be re-aligned or replaced. Inspect the radar sensor and
housing for damage. Radar sensor discoloration or small scratches
may be acceptable. Significant damage (such as cracks, or broken
pieces) will require radar sensor replacement. Regardless of the
exterior condition, check for diagnostic trouble codes outlined in the
Section 4.3: Diagnostic Trouble Codes (DTCs) to determine if radar
sensor replacement is necessary.
Damaged connector
or wiring
Visually inspect the connector and wire harness for corrosion or
chafing. Refer to Sections
4.5: Troubleshooting Diagnostic Trouble Codes: Power Supply and
4.6 Serial Data (J1939) Communications Link of « BENDIX SD-61-
4960 WINGMAN ADVANCED FLR20 SENSOR » for additional
troubleshooting.
J1939 network
problems
If the entire system is non-functional, it may be a J1939 network
problem. Follow the instructions in Section 4.6: Serial Data (J1939)
Communications Link in « BENDIX SD-61-4960 WINGMAN
ADVANCED FLR20 SENSOR ».
Power to radar sensor problems If the entire system is non-functional, another likely cause may be a
lack of power to the radar sensor. Follow the instructions in Section
4.5: Troubleshooting Diagnostic Trouble Codes: Power Supply.