SB1791

SERVICE BULLETIN
SB1791
ADDRESSEES
: Owners and operators of coaches listed under “Application”
ABC Customer Care and Parts Source
VEHICLE MODEL
: CX35 MY2020 vehicles
MANUAL SECTION
: 11.04 Control systems – Vehicle safety systems
BULLETIN TYPE
: Product improvement
DATE
: December 7th, 2021
SUBJECT
: To retrofit with Adaptive Cruise Control (ACC) and
Collision Mitigation System (CMS)
TERMS & CONDITIONS
: This document does not entitle to any reimbursement
APPLICATION
This product improvement bulletin is applicable to CX35 MY2020 vehicles.
Model
CX35 MY2020
VIN
49983  49999
83001  83044
83046  83059
DESCRIPTION
Van Hool has released Adaptive Cruise Control (ACC) in combination with Collision Mitigation
System (CMS) as an option for above mentioned vehicles.
This work procedure gives step-by-step instructions how to retrofit CX35 MY2020 vehicles with
Collision Mitigation System (CMS) and Adaptive Cruise Control (ACC).
NEW DASHBOARD SWITCHES
Switch
Function
To switch collision mitigation system (CMS) off/back on
To set following distance
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MESSAGES ON DASHBOARD DISPLAY
Symbol



Message
Appears in case of a ACC/CMS failure
Appears if the radar is hindered by e.g. fog, heavy rain, mud or ice
Flashes each time the ACC/CMS system intervenes
NOTE: Also appears a couple of seconds when vehicle ignition is
switched on, thus indicating that the system is carrying out a self-test.
Collision mitigation system (CMS) switched off
WHAT IS ADAPTIVE CRUISE CONTROL?
WARNING!
ACC is not designed to drive the vehicle independently. For that reason, ACC does
not relieve the driver from his/her responsibility to safely operate the vehicle at any time.
Driver training should be given so they can adapt his/her driving behavior, driving
capabilities, while using ACC to meet legal requirements and the overall traffic and road
conditions. Even with an active system, the driver is responsible to follow road speed
limitations, ensure a safe following distance, comply to driving time regulations and obey
passing restrictions. ACC should be used on major highways and not on secondary roads
or in traffic jams or in any other unsafe conditions.
ACC does not detect stationary objects/vehicles/people and does not reacts to vehicles
coming from the opposite direction.
ACC is a cruise control system with enhanced functionality. It ensures that the vehicle speed is
adjusted to the speed of the forward vehicle. It assists with the following distance between both
vehicles. When the distance to the forward vehicle drops below the set value, ACC will reduce
engine power and – if necessary – activate the braking system.
With ACC, you have to set the desired speed with cruise control and you can change the following
distance by the “Set following distance” dashboard switch.
NOTE: Adaptive cruise control only works if the cruise control is switched on.
HOW TO SWITCH ON ADAPTIVE CRUISE CONTROL?
NOTE: If vehicle speed drops below the cruise control off speed (25 mph) while driving, the system
is automatically switched off. A short acoustic signal will inform you of this.
Switch on cruise control. Adaptive cruise control is automatically switched on. On the dashboard
display appears the screen of adaptive cruise control.
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ADAPTIVE CRUISE CONTROL SCREEN ON DASHBOARD DISPLAY
A Set cruising speed
B Speed of forward vehicle
C Set following distance
D Following distance
HOW TO SET FOLLOWING DISTANCE?
You can choose between five following distances:





Longest following distance: five green blocks
Long following distance: four green blocks
Short following distance: three green blocks
Shorter following distance: two red blocks. This following distance is shorter than the legally
allowed minimum distance.
Shortest following distance: one red block. This following distance is shorter than the legally
allowed minimum distance.
NOTE: The following distance is speed-related and increases as vehicle speed increases.
With the cruise control switched on, press:
 the upper part of the "To set following distance" dashboard switch to make the following
distance larger.
 the lower part of the "To set following distance" dashboard switch to make the following
distance shorter.
DISTANCE WARNING:
If the forward vehicle brakes harder than the adaptive cruise control is able to, and an intervention
of the driver is required to maintain the following distance, you will be warned by a continuous
acoustic signal and a message on the dashboard display.
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FORWARD COLLISION WARNING:
NOTE: "Forward collision warning" also works when the cruise control system is not switched on.
Vehicles equipped with ACC also have "Forward collision warning". This system warns you if you
have to intervene in order to avoid an accident. You hear an interrupted acoustic signal and the
message below appears on the dashboard display.
WHAT DOES COLLISION MITIGATION SYSTEM (CMS) DO?
NOTE: CMS not only detects forward vehicles that are slower but also immobile objects over a
maximum distance of 490 ft.
The CMS system is switched on automatically when vehicle speed exceeds 9 miles/h.
The control unit of the system calculates the difference in speed between your vehicle and the
forward vehicle. If you approach the forward vehicle too quickly and do not intervene timely, a
message appears on the dashboard display and an acoustic signal is heard. Later on the brake
system will brake suddenly. If you still do not take action and the risk of an accident becomes too
big, the CMS will carry out an emergency stop to try to avoid the accident or to limit the damage.
WARNING!
CMS has its limitations. Having CMS on your vehicle should not tempt you to
reckless driving. Above all, do not brake later.
WARNING!
CMS does not reckon with traffic coming from the opposite direction.
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OPERATION OF CMS
From the moment the radar detects an object until the moment the collision mitigation system
carries out an emergency braking, the system goes through four phases.
Stage
1
2
3
4
Description
The ACC/CMS radar detects an object.
Your vehicle speed is higher than the speed of the object and the mutual
distance decreases. As soon as the distance becomes too small, the “Collision
Warning” message appears on the dashboard display together with the
illumination of the yellow “Collision Mitigation System (CMS) intervention”
message. At the same time you hear a warning signal.
You do not intervene and the speed of your vehicle remains higher than that of
the object. The brake system brakes suddenly to warn you.
You still do not intervene. The collision mitigation system carries out an
emergency braking to try to avoid an accident or to limit the damage.
WHEN IS CMS SWITCHED OFF?
WARNING!
CMS is a safety system. Switching off the system by means of the dashboard
switch can lead to dangerous situations.
CMS is switched off if:






the dashboard switch is pressed or …
you switch on the turn signals or …
you press the accelerator pedal fully down or …
you very quickly press the accelerator pedal nearly fully down or …
the radar is hindered by e.g. fog, heavy rain, mud or ice or …
the system has carried out more than three emergency brakings in a short while.
NOTE: The CMS system is also switched off during 20 seconds after the system has carried out an
emergency brake and has avoided an accident with an immobile object.
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LIMITATIONS OF CMS
System operation is limited:
 in case of bad weather (e.g. fog);
 in case of a slippery road surface (e.g. snow, rain or ice);
 when driving in a tunnel;
 when driving in sharp curves;
 when driving in curves at excessive vehicle speed;
 when vehicle speed exceeds 70 miles/h;
 the first 6 miles after you have started the vehicle.
SPECIAL TRAFFIC SITUATIONS
As the radar is unable to assess each traffic situation 100% correctly, it is possible that
wrong/unforeseen warnings are given. The frequency of these wrong/unforeseen warnings is
determined by driving style, road characteristics and traffic intensity. Roads with less objects at the
side or less traffic may cause the system to react in a more sensitive way.
Situation 1: Cornering, entering and
exiting bends
The ability of ACC/CMS to detect vehicles on
bends is limited. While cornering, entering or
exiting the bends, the system may interpret
traffic ahead in a wrong way. ACC/CMS may
unexpectedly issue warnings or brake your
vehicle.
Driver must exert extra caution while
cornering the vehicle on bends.
Situation 2: Immobile objects
ACC/CMS may unexpectedly issue warnings
or brake your vehicle when it detects
immobile objects.
 Lampposts;
 Road signs;
 Bridges;
 Traffic circles;
 Traffic islands.
Drivers must take extra care in case of
immobile objects at the roadside in order
to react to unexpected vehicle behavior.
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Situation 3: Different lanes and stationary
vehicles
ACC/CMS can experience difficulties at exits,
particularly when other vehicles are driving
on the hard shoulder or are pulling out.
ACC/CMS may unexpectedly issue warnings
or brake your vehicle.
Drivers must take extra care at exits and
take full control of the vehicle to avoid
unexpected braking.
Situation 4: Turning-off vehicles
On junctions or intersections, ACC/CMS may
unexpectedly issue warnings on vehicles that are
turning-off in front of your vehicle. It may as well
apply brakes in a manner which is different to
driver’s expectations.
Driver must pay full attention hence on
vehicles that turn-off on junctions and
intersections.
Situation 5: Other vehicles change lanes
ACC/CMS may detect vehicles (truck, car,
motorcycle) pulling into your lane a bit later. The
distance to the vehicle entering in front of your
lane may than be too short. In this situation the
driver should make use of the service brake to
maintain the required safe distance to the
vehicle pulling in the front.
Situation 6: Overtaking
While overtaking, ACC/CMS may issue
unexpected warnings or slow down the vehicle if
the driver:
 is driving too close to the vehicle in front
and...
 is in the same lane as the vehicle in front.
Therefore driver should complete the lane
change maneuver without reducing the safety
distance to the front vehicle.
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Situation 7: Curved vehicles
On winding stretches of road, ACC/CMS may not
detect which lane the vehicle in front is driving in.
ACC/CMS hence may unexpectedly issue
warnings or slow down your vehicle. ACC/CMS
may also accelerate the vehicle unexpectedly if a
vehicle in front is not detected by the distance
sensor properly. Driver must pay extra attention
on winding stretches and take full control of the
vehicle by applying the service brakes.
WHAT DO YOU HAVE TO DO WHEN YOU WANT TO PURCHASE ACC/CMS ON
YOUR VEHICLE?
Contact ABC Companies, installation must be done by ABC Companies.
WHAT WILL ABC COMPANIES DO?
ABC Companies will quote you the price to retrofit your vehicle with ACC/CMS.
ABC Companies will perform the retrofit according to the step-by-step instructions
indicated in Van Hool work procedure WP1252 which is available on the customer portal
under the heading "Work procedures for dealers and service points".
HELP DESK:
If there are any questions, please call ABC Customer Care & Parts Source toll-free for guidance on
1-877-427-7278. Listen for the prompts for warranty and select that option.
DISCLAIMER:
The procedures contained herein are not exclusive. Van Hool cannot possibly know, evaluate, or
advise the transportation industry of all conceivable ways in which a procedure may be undertaken
or of the possible consequences of each such procedure. Other procedures may be as good, or
better, depending upon the particular circumstances involved. Each carrier who uses the
procedures herein must first satisfy itself thoroughly that neither the safety of its employees or
agents, nor the safety or usefulness of any products, will be jeopardized by any procedure
selected.
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INFORMATION HANDLING:
Important additions and modifications regarding technical information not yet included in the
manual will be communicated through Service Bulletins.
VAN HOOL CUSTOMER PORTAL:
Consult the customer portal regularly for the latest service documentation. In addition to the
maintenance manual, you will also find the operating manual and the spare parts catalogue of your
vehicle on the customer portal. The customer portal is accessible through www.vanhool.be under
the "service" menu item, and only with a code (password) from Van Hool. If you do not have a
password yet, request it by using the link on the Van Hool website.
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