DSI Scott System Driving Control User manual

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OWNER'S MANUAL
Scott System Driving
Control
Chrysler Town & Country
MINI-VAN

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CONTENTS
I. Introductory Information...................................................................................................
DSI's Commitment to You ........................................................................................
About the Warranties.................................................................................................
View of system..........................................................................................................
Safety Precautions .....................................................................................................
II. Using and Understanding the System...............................................................................
About the System ......................................................................................................
System Design Features.............................................................................................
System Controls.........................................................................................................
III. Driving the Van with the System.....................................................................................
Accelerator and Brake...............................................................................................
Accelerator ................................................................................................................
Steering .....................................................................................................................
IV. Operating the Van with the System................................................................................
Entering the Van........................................................................................................
The Driving Position .................................................................................................
System Controls.........................................................................................................
Starting the Engine....................................................................................................
Motion Control..........................................................................................................
Shut Down and Exit ..................................................................................................
V. Care and Maintenance of the System .............................................................................
Meter Readings..........................................................................................................
Operational Check List..............................................................................................
Maintenance and warning devices.............................................................................
Warning lights and indicators....................................................................................
Lift warning buzzer ...................................................................................................
Low Vacuum warning buzzer....................................................................................
Tiedown Warning Buzzer..........................................................................................
Warning lights...........................................................................................................
ABS warning lights ...................................................................................................

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VI. Repairs and Troubleshooting..........................................................................................
Brake system..............................................................................................................
Steering function .......................................................................................................
Secondary controls ....................................................................................................
Dsi tie-down description ...........................................................................................
Dsi tie-down trouble shooting...................................................................................

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I. INTRODUCTORY INFORMATION
DSI'S COMMITMENT TO YOU
Driving Systems Incorporated (DSI) is the foremost developer of adapted vehicles. Since
1967, DSI has produced safe and reliable vehicle for their clients and has provided service and
maintenance to allow continued satisfaction.
The Driving System (Scott System) van control equipment has been designed and installed in
your van to provide a specific means of operating a van for a particular individual.
To contact Driving Systems Incorporated call or write:
Driving Systems Incorporated
16139 Runnymede Street
Van Nuys, CA 91406-2913
TEL: [phone]
FAX: [phone]
This manual is supplemental to the vehicle owner guide. This manual and the vehicle owner
guide should be read and understood before operating the vehicle.
If a situation arises that is not covered in this manual, please contact DSI for assistance.
This manual is not intended to replace a thorough program of evaluation and driver
training. The Scott Driving System is for those with severe disabilities. We feel strongly that
potential drivers with disabilities should be tested to decide that the Scott System is a suitable
solution to help an individual to become an independent driver. Driving Systems Inc. has been
a long time member and supporter of the Association of Driver Rehabilitation Specialists
(A.D.E.D.). This organization and it’s members have a large amount of experience regarding
disabled drivers and can provide insight into the challenge of selecting equipment that meets
the needs of the individual driver. We strongly recommend contacting an A.D.E.D. member
before the selection of any type of mobility equipment.
A second issue, which should be touched on at the very beginning of this manual is that of the
individualization of the controls and positioning for each driver. The “fitting” as we call it, is
almost as important as the mechanical condition of the vehicle and driving controls
themselves. Due to the physical limitations of our drivers, the positioning of the controls and
the driver in relation to the controls is critical to the safe operation of a Scott System equipped
van. The fitting consists of adjustment and location of the driver and controls. The
effectiveness of which is confirmed by test driving. Very small changes can make a large
difference in the driver’s ability to control the vehicle and the secondary functions.
A third consideration to be addressed is the use of the vehicle by an able bodied driver. Over
the years we have noted that with proper training it is possible for an able bodied individual to
drive the Scott System successfully. The key is the proper training. A seat, firmly attached to
the tie-down with two arm rests is best for a driving platform. While the lap and shoulder belt
which came with the van should always be used, the driver without a disability may also wish
to have a chest harnes attached to the quick release seat. Excessive movement of the arms and
upper body make driving difficult. Driving Systems Inc. can provide a bracket that

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locks out the forward / rearward throttle – brake movement, allowing the driver to use the
original equipment pedals for brake and gas. Remember anyone lacking both the training and
experience will not be as skillful as the person who the vehicle was built for and who has the
proper training and some miles experience. Many of our clients have spouses, attendants and
mechanics who are able to drive their Scott System vans successfully.
WARRANTIES
The DSI equipment is used in conjunction with the products of other companies, most notably
the van and the wheelchair lift. The warranties for all items other than DSI equipment should
be referred to in respective owner's manuals.
Basic DSI Warranty
WARRANTY AND LIABILITY: dSi will repair or replace any product or parts there are that wears
out or proves defective under normal use for a period of one year from date shipped. All equipment
and modifications must be inspected by DSI or an approved DSI dealer every six (6) months for the
warranty to remain effective. Use of the equipment by people other than those specifically authorized
and instructed by an employee of dSi, or a driver trainer voids warranty. Use of equipment
manufactured, modified, serviced, installed or sold by dSi is at the user’s risk. dSi will not be held
liable for any injury or property damage due to use or failure of equipment sold, serviced, modified,
manufactured or installed by dSi. dSi will not assume financial responsibility or any liability for
alterations or repairs of equipment done elsewhere.
DSI Warranty on Maintenance and Repair
The D.S.I. warranty covers the driving controls, parts and labor for a period of one year or
12,000 miles which ever comes first.
WHAT YOU MUST DO:

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Return your DSI van to your selling agency. Please give him as much advance notice as
possible. You must allow a reasonable time for repairs.
IF YOU ARE TRAVELING:
Call DSI for further instructions to honor this warranty.
WHAT IS NOT COVERED:
• Lubrication. Adjustments for rattles and squeaks due to normal use.
• Malfunction or damage caused by misuse, neglect, improper adjustments, modification,
alteration, tampering, disconnection, improper or inadequate maintenance, accidents, the
mechanical condition of your vehicle, road hazards, weather, overloading, or other events
beyond our control (such as fire, lightning, flood, etc.).
• Paint and trim damage due to after delivery use.
• Shipping or transportation charges, loss of time, inconvenience, loss of use of the vehicle,
commercial loss, or other consequential damages.
PRODUCT CHANGES:
We reserve the right to make changes in DSI products at any time without incurring any
obligation to make the same or similar changes on products previously built and sold by us.
STATE LAW RIGHTS:
This warranty gives you specific legal rights; you may also have other rights, which vary from
state to state.
OWNERS MANUALS:
This owner’s manual is one of three which you must read and understand before operating
your vehicle. The other two are the Owners Manual for the General Motors, vehicle which
has been modified for your use and the Braun Corp Mini Van Owner’s manual. Braun Corp
did the access modifications on your van (floor lowering , ramp, etc.) and those instructions
are important for your safe use.

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SAFETY PRECAUTIONS
** PLEASE BE CAREFUL **
Caution
Read and understand all instructions before attempting to operate your
vehicle.
Any product is only as safe as the individual using it. For that reason, the following basic
safety precautions must be complied with at all times.
. Respect the marked speed limit.
· Unusual noises or movements should be immediately inspected by a dSi dealer.
· Inspect the dSi van prior to each use. If an unsafe condition exists, do not use it. Return it to
dSi for repair.
· Keep others clear of the DSI equipment when it is being operated. This includes service
animals.
· Do not place any part of your body (except your hands) or clothing in or near any part of the
DSI equipment.
· Always use careful common sense when operating the DSI van. This product is designed and
manufactured to give years of safe, reliable service but it is not capable of thinking for the
user...that is your responsibility as the user.
· The van must be safely parked and the motor turned off before leaving the van.
· Never allow children or others to play with DSI equipment.
· Be sure you have read and understand each of these safety precautions. If you have any
questions contact DSI.
· Keep these instructions in the van and review them periodically. If you permit other users to
operate this product be certain they also review these instructions and have been trained and
have an opportunity to practice before driving on the road.

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II. USING AND UNDERSTANDING THE SYSTEM
About the system
The DSI van control equipment enhances the original van manufacturer's mechanisms,
allowing for balanced, sensitive control of the steering, accelerator and brake.
A customized control post with steering wheel (or Tri-post) is fitted to the individual client.
An array of vehicle function switches is arranged within the client's reach. Auxiliary and/or
optional switches are located in the center of the steering wheel or where convenient.
System design features
The DSI van control equipment has been designed in such a way that a small amount of force
and motion can safely and conveniently manage the driving controls of a van.
The DSI System features a combination of mechanical, vacuum and electrical devices to
achieve the level of sensitivity needed to operate the van. The accelerator and brake leverage
device is mechanically balanced to provide the client a feel for the van and the road and
counter the effects of acceleration and deceleration on the control post. This allows for a true
driving sensation and safe operation over rough surfaces. The steering system is controlled by
a wheel, (or Tri-Post),which conveys the client's movements to the tires, with the DSI system
assisting the motion.
SYSTEM CONTROLS
Primary controls-the driving controls are attached to the center post. Turning the steering
wheel (or pivoting the tri-post) causes the front van wheels to turn. Moving the center post
forward engages the accelerator and pulling back on the center post engages the brakes.
Secondary controls-n array of push button switches are placed in a convenient location for the
client. The switch box connects to the relay box. The switches and relays control various van
functions. Some buttons are momentary (such as the horn) and other buttons are latching
which turn on and off with one push of the button and off with a second push of the button
(such as the lights). The relays are 30 amp Bosch relays which are easily replaced. The switch
boxes are arranged by D.S.I to safely fit each client’s needs.

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III. DRIVING THE VAN WITH THE SYSTEM
Accelerator and brake
Vacuum Brake Assist
The brake system employed in the Scott Driving Controls is essentially a vacuum boost assist
applied to the stock van power brake controls. The stock brake mechanism is unmodified from
the brake pedal to the brake drum and calipers. In late model vans the A.B.S. brake controls
are unaffected.
The Scott System is fairly simple and consists of two major components. The driver in pulling
back the steering column operates a brake servo valve which in turn supplies vacuum to a
brake booster diaphragm. This diaphragm pulls on the stock brake pedal through a bell crank,
thereby applying the brakes.
The brake servo valve is a balanced popit vacuum valve. When it is operated, vacuum flows to
the brake booster diaphragm and the brakes are actuated. The valve will allow vacuum to flow
in a measured and predictable way, making it possible to make smooth, predictable brake
applications. The brake servo valve has just two moving parts and requires very little
maintenance. Since the brake servo valve is built into the brake linkage, it responds very
quickly to changes to the control column position. The brake booster is a large rubber
diaphragm; enclosed in a metal container responsive to the vacuum supplied by the valve. The
rubber diaphragm inside the brake booster requires periodic replacement.
All brake linkage is made of 4130 chrom-moly steel. All rod ends are impregnated with long
lasting lubricant. The length of the brake linkage is fixed at the time of construction, insuring
that the brake is activated as soon as the control column is pulled back from it’s 90°position.
Any increase in brake travel is usually the result of rear brake shoe wear. DSI recommends the
rear brakes be manually adjusted or adjusted by deliberate use of the self-adjusting feature of
the General Motors brake system (see your vehicle’s owner’s manual). Gradual deterioration of
the stock brake master cylinder will be characterized by intermittent loss of hydraulic pressure
at the wheels. The driver will experience dramatically increased control column travel most
often starting intermittently. If these conditions occur, the vehicle must be returned to the
General Motors dealer as soon as possible to avoid brake failure. .Brake problems, which are
mechanical in origin, will be consistent, happening every time the brake is applied.
All braking mechanisms added in the Scott Driving Systems are vacuum in nature. There are no
changes or modifications to the original manufacturers hydraulic brake controls. Vacuum is
created by the engine sucking air into the intake system. Vacuum for the Scott System controls
is drawn from the 3/8 vacuum line that supplies vacuum boost to the stock power brake vacuum
booster. Vacuum is stored in a 720 cubic inch steel vacuum tank under the van. A soft seated
check valve insures the retention of stored vacuum for emergency use. If the engine stalls or run
out of gas, the stored vacuum provides enough brake assist to pull off the road
In normal use, the driver in the Scott System will not really feel the quality of the brake valve.
If however the driver pulls back for brakes the brake valve opens, the brake pedal is pulled
down and the driver’s ‘feel” notchiness or stickiness, this is characteristic of a brake valve that
needs service. Since the valve is vented with atmospheric air from both sides, dirt, sand and
water can enter the valve under extreme conditions. These contaminants shorten the life of the
quad rings inside the valve. Since the two moving parts inside the valve are stainless steel, they
are seldom damaged.

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Maintenance of the valve normally requires only cleaning, polishing, re-
lubrication and
replacement of the quad rings. This should be done only by a DSI authorized dealer. If it must
be done by a local mechanic, the recommended lubricant is moly-disulphide grease, which is
resistant to heat/cold, water and oxidation. The use of other greases, lithium, wheel bearing
grease etc. is not recommended due to the precise operation of the brake valve.
Your van has a vacuum gauge to monitor the amount of reserve brake vacuum in the storage
tank. This gauge allows a test procedure to be performed to check the integrity of the brake
booster diaphragm.
Accelerator
The operation of the throttle is accomplished by a leverage system actuating
a specially
lightened electrically operated throttle pedal.
Steering
The steering components in the Scott Driving System are modified stock mechanical/hydraulic
items utilizing closed loop follow-up linkage and a redundant back-up pump. A steering ratio
change reduces the turning radius of the small steering wheel or 3 post device to 180 degrees
from 3 turns on the stock steering wheel or 3 post device to 180 degrees from 3turns on the
stock steering wheel.
From the input devices, (either the mini wheel or the 3 post), a series of sprockets and chains
carry the motion through rectangular housing. The entire counter balanced housing pivots in a
floor mounted framework, forward movement for throttle, backwards for brake. The lowest
sprocket rotates a shaft which has u-joints at both ends. This shaft goes through the firewall and
connects with a rack valve mounted on the stock steering rack. A follow-up link assembly
connects with the rack end on the passenger side to complete the full feed-back
The Scott Driving System incorporates a full closed loop steering. This means that the control
device is mechanically attached to the road wheels. The driver receives feedback relating to both
road conditions and control movement limits due the continuous mechanical attachment or the
controls in the O.E.M. steering, brake and throttle devices. “Road Feel” is transmitted to the
driver through the linkage. The position of the input devices is always directly related to the
position of the road wheels.
The Scott System has a back-up steering system, which is intended to provide power assist in case
of power steering pump, belt or engine failure. A 12-volt pump is tri
ggered either
automatically by means of a pressure sensitive switch or manually via a console-mounted push
button. To insure durability of hydraulic and components the power steering fluid is cooled,
filtered and stored in a large capacity aluminum tank.