MAINTENANCE Mi14-34D
INFORMATION
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
Equipped with Prevost AWARE Adaptive Cruise Braking system

All

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 FAULT

ACB RADAR DATA LINK FAILURE
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

Mi14-34D / Page 1

/14

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
2 – steel clip
3 – digital inclinometer
4 – laser
5 – cap screw ¼-20UNC X 3/8 (not visible)

Qty: 1
Qty: 1
Qty: 1
Qty: 2
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.
Mi14-34D / Page 2

/14

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.

Mi14-34D / Page 3

/14

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).

Mi14-34D / Page 4

/14

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

Mi14-34D / Page 5

/14

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

Mi14-34D / Page 6

/14

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

Mi14-34D / Page 7

/14

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 T20 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

Mi14-34D / Page 8

/14

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 ».

Mi14-34D / Page 9

/14

TROUBLESHOOTING
TROUBLESHOOTING BASICS
QUESTIONS TO DRIVER
Have the driver run the
Power-Up Self-Test.

NEXT STEPS
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”.

Does the driver hear a long
warning beep?

Have the driver describe the
system behavior that they
believe shows it is not working
properly.

As the ACB system self-test runs, the driver should hear a short set of