Acura MDX (2018 year). Manual — part 29
454
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Towing a Trailer
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Towing Preparation
Driving
■
To estimate the tongue load
Excessive tongue load reduces front tire traction and steering control. Too little
tongue load can make the trailer unstable and cause it to sway.
You can estimate the tongue load by measuring the trailer hitch height from the
ground in the following steps:
1. Park the vehicle on level ground.
2. Measure the distance between the ground and the bottom of the trailer hitch.
3. Connect the fully loaded trailer to the hitch.
4. Measure the distance between the ground and the bottom of the trailer hitch
again.
5. Subtract the second measurement from the first measurement, then refer to the
following table.
If the difference becomes more than indicated in the table, distribute the load or
remove cargo as needed.
If the difference is
AWD models
2WD models
1 inches (2.5 cm)
150 lbs (68 kg)
1 1/2 inches (3.8 cm)
250 lbs (114 kg)
2 inches (5.1 cm)
350 lbs (159 kg)
2 3/8 inches (6.0 cm)
450 lbs (205 kg)
—
2 5/8 inches (6.7 cm)
500 lbs (227 kg)
—
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455
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Towing a Trailer
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Towing Preparation
Driving
■
How to weigh the trailer loads using the public scale
Check each weight in the order indicated as shown.
Refer to the table on the right for each weight’s limit except for the tongue load.
2 Tongue load P. 453
• If you cannot weigh the rear axle, subtract 1 from 2.
• The maximum gross combined weight (4) decreases by 2% for every 1,000 feet
(305 meters) of elevation.
• To calculate the tongue load, subtract 5 from 6.
• Refer to the trailer owner’s manual for additional information.
1
How to weigh the trailer loads using the public scale
Fully load the vehicle and trailer. An attendant who
watches the scale is needed as all occupants should
stay in the vehicle.
If a public scale is not available, add the estimated
weight of your cargo load to the weight of your
trailer (as quoted by the manufacturer), and then
measure the tongue load with an appropriate scale or
tongue gauge or estimate it based on cargo
distribution.
Weight limit for
2WD models
AWD models
Front gross axle
2,811 lbs
(1,275 kg)
2,910 lbs
(1,320 kg)
Gross vehicle
5,368 lbs
(2,435 kg)
5,677 lbs
(2,575 kg)
Rear gross axle
2,734 lbs
(1,240 kg)
2,965 lbs
(1,345 kg)
Gross combined
8,036 lbs
(3,645 kg)
9,833 lbs
(4,460 kg)
1. Front gross axle weight.
2. Gross vehicle weight.
4. Gross combined weight.
3. Rear gross axle weight.
5. Hitched trailer weight.
6. Unhitched trailer weight.
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Towing a Trailer
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Towing Preparation
456
Driving
Towing generally requires a variety of supplemental equipment.
To ensure the best quality, we recommend that you purchase Acura equipment
whenever possible.
■
Towing Equipment and Accessories
1
Towing Equipment and Accessories
Make sure that all equipment is properly installed and
maintained, and that it meets federal, state, province/
territory, and local regulations.
Consult your trailer maker for proper installation and
setup of the equipment.
Improper installation and setup can affect the
handling, stability, and braking performance of your
vehicle.
Consult your trailer sales or rental agency if any other
items are recommended or required for your towing
situation.
The lighting and wiring of trailers can vary by type
and brand. If a connector is required, it should only
be installed by a qualified technician.
Trailer packages and products:
•
Ball mount, hitch plug, hitch pin etc.
•
Wiring harness kit
•
Trailer hitch kit (jumper harness included)
Are available at a dealer.
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Continued
457
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Towing a Trailer
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Towing Preparation
Driving
■
Trailer brakes
Recommended for any trailer with a total weight of 1,000 lbs (450 kg) or more:
There are two common types of trailer brakes: surge and electric. Surge brakes are
common for boat trailers, since the brakes will get wet.
If you choose electric brakes, be sure they are electronically actuated. Do not
attempt to attach trailer brakes to your vehicle’s hydraulic system, as it will lower
braking effectiveness and create a potential hazard.
The 4-pin gray connector installed in your vehicle has all of the circuits required to
install most electric trailer brake controllers.
Have a qualified mechanic install your trailer
brake controller following the trailer brake
controller manufacturer’s instructions. Failure
to properly install the trailer brake controller
may increase the distance it takes for you to
stop your vehicle when towing a trailer.
1
The 4-pin gray connector is located under the left
side instrument panel.
Electric Brake
(Light Green) (20A)
Ground
(Brown)
Brake
(Green)
Stop
(Violet)
Trailer brake controller
connector’s terminals:
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Towing a Trailer
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Towing Preparation
458
Driving
■
Trailer light
Trailer lights and equipment must comply with federal, state, province/territory, and
local regulations. Check with your local trailer sales or rental agency for the
requirements in the area where you plan to tow.
We recommend that you have a dealer install a Acura wiring harness and converter.
They are designed for your vehicle.
■
Hitches
Read the trailer manufacturer’s instructions, and select the appropriate draw bar for
the height of the trailer you will be towing.
■
Weight distribution hitches
Your vehicle is designed to tow without the need for a load distributing hitch. If you
wish to use one, please consult your trailer maker for proper installation and set-up.
Improper set-up could degrade the handling, stability, and braking performance of
your vehicle.
1
The trailer lighting connector is located behind the
left side panel in the cargo area.
Even if you are planning to use the non-Acura trailer
lighting harness and converter, ask a dealer for the
correct connector and pins.
+B Trailer Charge
+B Trailer Hazard Light
+B Trailer Hazard Light
+B Trailer Back Light
Back Light
+B ELEC Brake
Right Turn Signal
Stop Light
Pins’ wiring color codes and their purposes:
+B Trailer Small
IG2 HAC
Left Turn Signal
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459
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Towing a Trailer
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Towing Preparation
Driving
■
Safety chains
Always use safety chains when you tow a trailer. Leave enough slack to allow the
trailer to turn corners easily, but do not allow the chains to drag on the ground.
■
Sway control
This device can be used if your trailer tends to sway. Your trailer maker can tell you
what kind of sway control you need and how to install it. Improper installation could
degrade the handling and stability of your vehicle.
■
Trailer mirrors
Many states, provinces and territories require special exterior mirrors when towing a
trailer. Install special mirrors whenever you cannot clearly see behind you, or if the
trailer creates a blind spot.
■
Automatic transmission cooler
*
An additional ATF (automatic transmission fluid) cooler is required to keep the
transmission from overheating when towing more than 3,500 lbs (1,588 kg). You
can get the additional ATF cooler at a dealer.
AWD models
* Not available on all models
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460
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Towing a Trailer
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Trailer Stability Assist
Driving
Trailer Stability Assist
Helps to stabilize the vehicle and trailer when the trailer severely sways.
■
How trailer stability assist works
When the vehicle and trailer become unstable while driving, trailer stability assist
determines the cause. If the trailer oscillation is detected as the cause, and the
swaying increases, the system applies the brakes or controls engine output to reduce
vehicle speed.
Both the vehicle and trailer brake lights come on automatically if you brake to
reduce vehicle speed.
1
Trailer stability assist is not a function that prevents
the vehicle and trailer from swaying. Avoid high
speeds, abrupt steering, improper trailer load, and
sudden braking to keep the trailer from swaying.
When swayed too severely, the system becomes
ineffective, and you may lose control of your vehicle,
causing the trailer to roll over or get damaged.
2 Driving Safely with a Trailer P. 461
Trailer towing sway is caused by:
•
Crosswinds
•
Improper towbar down load
•
Excessive Speed
The VSA® system indicator blinks during the trailer
stability assist operation.
2 VSA® Operation P. 517
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461
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Towing a Trailer
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Driving Safely with a Trailer
Continued
Driving
Driving Safely with a Trailer
• Have the trailer properly serviced and keep it in good condition.
• Make sure that all the weights and load in the vehicle and trailer are within limits.
• When towing more than 3,500 lbs (1,590 kg), use of gasoline with a pump
octane number of 91 or higher is recommended.
u
Towing performance can be affected by high altitude, high temperature, or
steep uphill.
• Securely attach the hitch, safety chains, and other necessary parts to the trailer.
• Securely store all the items in and on the trailer so that they do not shift while
driving.
• Check if the lights and brakes on the trailer are working properly.
• Check the pressures of the trailer tires, including the spare.
• Turn off Auto Idle Stop system using Auto Idle Stop OFF button. The trailer
weight can affect your vehicle’s brake effectiveness if Auto Idle Stop is activated
on a hill while towing a trailer.
• Drive slower than normal.
• Obey posted speed limits for vehicles with trailers.
• Use the
(
D position when towing a trailer on level roads.
■
Things You Need To Know Before Towing a Trailer
■
Towing Speeds and Gears
1
Parking
In addition to the normal precautions, place wheel
chocks at each of the trailer’s tires.
Models with Auto Idle Stop
1
When towing a fixed-sided trailer (e.g., camper), do
not exceed 55 mph (88 km/h).
At higher speeds, the trailer may sway or affect
vehicle handling.
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462
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Towing a Trailer
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Towing Your Vehicle
Driving
• Turn more slowly and with a wider turning arc than normal.
• Allow more time and distance for braking.
• Do not brake or turn suddenly.
• Monitor your temperature gauge. If it nears the red (Hot) mark, turn off the
climate control system and reduce speed. Pull to the side of the road safely to cool
down the engine if necessary.
• Change the gear position to
(
S position if the transmission shifts frequently.
If the vehicle tires slip when retrieving a boat from the water, keep the transmission
in
(
D and do not use the sequential shift mode in
(
S. This prevents damage to the
transmission.
Towing Your Vehicle
Your vehicle is not designed to be towed behind a motor home. If your vehicle needs
to be towed in an emergency, refer to the emergency towing information.
2 Emergency Towing P. 666
■
Turning and Braking
■
Driving in Hilly Terrain
■
Retrieving a Boat
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463
Driving
Off-Highway Driving Guidelines
General Information
Your vehicle has been designed primarily for use on pavement, however, its higher
ground clearance allows you to occasionally travel on unpaved roads. It is not
designed for trail-blazing, or other challenging off-road activities.
If you decide to drive on unpaved roads, you will find that it requires somewhat
different driving skills and that your vehicle will handle somewhat differently than it
does on pavement. Pay attention to the precautions and tips in this section, and get
acquainted with your vehicle before leaving the pavement.
Important Safety Precautions
To avoid loss of control or rollover, be sure to follow all precautions and
recommendations:
• Be sure to store cargo properly and do not exceed your cargo load limits.
2 Maximum Load Limit P. 449
• Whenever you drive, make sure you and your passengers always wear seat belts.
• Keep your speed low, and never go faster than the conditions allow.
• It’s up to you to continually assess the situation and drive within the limits.
1
Off-Highway Driving Guidelines
Failure to operate your vehicle correctly might result
in a crash or a rollover.
2 Important Handling Information P. 30
2 Precautions While Driving P. 470
Spinning the tires can also damage the SH-AWD®
system.
3
WARNING
Improperly operating this vehicle on or off
pavement can cause a crash or rollover in
which you and your passengers could be
seriously injured or killed.
• Follow all instructions and guidelines in
this owner’s manual.
• Keep your speed low, and don’t drive
faster than conditions permit.
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464
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Off-Highway Driving Guidelines
u
Avoiding Trouble
Driving
Avoiding Trouble
• Check Out Your Vehicle before you leave the pavement and make sure that all
scheduled maintenance has been completed. Pay special attention to the
condition of the tires, and check the tire pressures.
• Remember the route you choose presents limits (too steep or bumpy), you have
limits (driving skill and comfort), and your vehicle has limits (traction, stability, and
power). Failing to recognize these limits will likely put you and your passengers in
a hazardous situation.
• Accelerating and Braking should be done slowly and gradually. Trying to start
or stop too fast can cause a loss of traction and you could lose control.
• Avoiding Obstacles and Debris in the road reduces the likelihood of a rollover
or damage to your suspension or other components.
• Driving on Slopes increases your risk of a rollover, particularly if you attempt to
drive across a slope that is too steep. Going straight up or down a slope is usually
the safest. If you can’t clearly see all conditions or obstacles on a slope, walk it
before you drive it. If there is any doubt whether you can safely pass, don’t try it.
Find another route. If you get stuck when climbing, do not try to turn around.
Back down slowly following the same route you took up the hill.
• Crossing a Stream - Avoid driving through deep water. If you encounter water
in your route (a small stream or large puddle, for example), evaluate it carefully
before going ahead. Make sure it is shallow, flowing slowly, and has firm ground
underneath. If you are not sure of the depth or the ground, turn around and find
another route. Driving through deep water can also damage your vehicle. The
water can get into the transmission and differential, diluting the lubricant and
causing an eventual failure. It can also wash the grease out of the wheel bearings.
• If You Get Stuck, carefully go in the direction that you think will get you
unstuck. Do not spin the tires as this will only make things worse and could
damage the transmission. If you are unable to free yourself, your vehicle will need
to be towed. Front and rear tow hooks are provided for this purpose.
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465
Continued
Driving
When Driving
Starting the Engine
1. Make sure the parking brake is applied.
u
The electric parking brake indicator
comes on for 15 seconds when you press
the electric parking brake switch.
2. Depress the brake pedal.
3. Press the ENGINE START/STOP button
without depressing the accelerator pedal.
The engine will crank until it starts.
1
Keep your foot firmly on the brake pedal when
starting the engine.
The engine is harder to start in cold weather and in
thinner air found at altitudes above 8,000 feet (2,400
meters).
When starting the engine in cold weather, turn off all
electrical accessories such as the lights, climate control
system, and rear defogger in order to reduce battery drain.
If you live in a region where winter is extremely cold,
an engine block heater and transmission clutch
actuator heater will improve starting and warming of
the engine. Consult a dealer for details.
If the exhaust system sounds abnormal or you can
smell exhaust gas inside the vehicle, have your vehicle
checked by a dealer. There may be a problem with
the engine or exhaust system.
Bring the keyless access remote close to the ENGINE
START/STOP button if the battery in the keyless
access remote is weak.
2 If the Keyless Access Remote Battery is
The engine may not start if the keyless access remote
is subjected to strong radio waves.
Do not hold the ENGINE START/STOP button to
start the engine.
If the engine does not start, wait at least 30 seconds
before trying again.
Electric Parking Brake Switch
Brake Pedal
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When Driving
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Starting the Engine
466
Driving
You can turn the engine off when the vehicle is completely stopped.
1. Put the transmission into
(
P.
2. Press the ENGINE START/STOP button with your foot on the brake pedal.
■
Stopping the Engine
1
The immobilizer system protects your vehicle from
theft.
If an improperly coded device is used, the engine’s
fuel system is disabled.
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Continued
467
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When Driving
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Starting the Engine
Driving
You can remotely start the engine using the two-way keyless access remote from
extended distances.
■
To start the engine
The engine runs for up to 10 minutes without you starting the vehicle.
To extend the run time for another 10 minutes during the first run, press the
button, then press and hold the
button.
u
The amber LED blinks, then the green LED comes back on if a 10-minute
extension request was transmitted successfully.
After pressing the (lock) button, wait for the green LED to blink. This indicates that
the all the doors and the tailgate are locked.
■
Remote Engine Start with Vehicle Feedback
*
1
Remote Engine Start with Vehicle Feedback
WARNING:
Carbon monoxide gas is toxic and can
rapidly accumulate in closed or even partly enclosed
areas.
Breathing it can cause unconsciousness and even kill
you.
Never use the remote engine starter with the vehicle
parked in a garage or other areas with limited
ventilation.
Remote Engine Start run timer extension
The engine runs for another 10 minutes from the
time of extension request. The max engine run time is
20 minutes, if the extension request is made after 10
minutes of first engine run.
If there are buildings and obstacles between your
vehicle and the remote, the range will be reduced.
This distance may vary by external electrical
interference.
The engine may not start by the remote engine start
if:
•
You have disabled a remote engine start setting
using the multi-information display (MID).
•
The power mode is not in VEHICLE OFF (LOCK).
•
The transmission is in a position other than
(
P.
•
The hood is open, or any door or the tailgate is
unlocked.
•
You have already used the remote twice to start
the engine.
Press the
button, then
press and hold the
button.
Amber LED: Blinks when any button is pressed.
Continues to blink
during a vehicle
self check until the
engine starts.
Go within the range,
and try again.
Green LED: Comes on while
the engine is running.
Red LED: Blinks when the
remote is out of the keyless
access system range.
* Not available on all models
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When Driving
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Starting the Engine
468
Driving
■
To stop the engine
Press and hold the
button
for one second.
Go within the range,
and try again.
Amber LED: Blinks when any
button is pressed.
Red LED:
●
Comes on for one second to let you
know that the engine has stopped.
●
Blinks when the remote is out of
the keyless access system range.
The engine will not stop.
1
Remote Engine Start with Vehicle Feedback
•
Another registered keyless access remote is in the
vehicle.
•
There is any antenna failure.
•
Door is unlocked with the built-in key.
•
The engine oil pressure is low.
•
The engine coolant temperature is extremely high.
•
The telematics unit malfunctions.
•
The security system alarm is not set.
Before starting the engine, make sure to check the
door lock status using the remote. When you press
the
button, wait for the green LED to blink. If
the red LED turns on, the doors and tailgate did not
lock, and the engine does not start.
While the engine is running, the vehicle will
automatically precondition inside the vehicle.
When it is warm outside:
•
The air conditioning is activated in recirculation
mode.
•
The seat ventilation is activated
*
.
When it is cold outside:
•
The defroster is activated at a moderately warm
temperature.
•
The rear defogger and door mirror heaters are
activated.
•
The seat heaters and heated steering wheel are
activated
*
.
2 Heated Steering Wheel
*
P. 216
* Not available on all models
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469
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When Driving
u
Starting the Engine
Driving
1. Depress the brake pedal and press the ENGINE START/STOP button
simultaneously.
2. Keeping your right foot on the brake pedal, press the
(
D button. Select
(
R when
reversing.
3. With the parking brake applied, release the brake pedal and gently depress the
accelerator pedal.
u
Make sure the electric parking brake indicator goes off.
2 Parking Brake P. 528
2 If the Transmission System Indicator Blinks along with the Warning Message
P. 657
■
Hill start assist system
Hill start assist keeps the brake engaged briefly to help prevent the vehicle from
rolling on inclines as you move your foot from the brake pedal to the accelerator.
Change the gear position to
(
D or
(
S when facing uphill, or
(
R when facing
downhill, then release the brake pedal.
The brakes remain engaged briefly as you release the brake pedal.
■
Starting to Drive
1
The engine stops when the gear position is changed
from
(
P before the ENGINE START/STOP button is
pressed. Follow the step 1 when starting to drive.
You can also release the parking brake by pulling the
electric parking brake switch while depressing the
brake pedal.
When facing downhill, you can start your vehicle
more smoothly by manually releasing it with the
electric parking brake switch than by releasing it with
the accelerator pedal.
When the engine was started using the two-way keyless
access remote
*
When the engine was started using the two-way keyless access remote
*
When the engine was started in any case
1
Hill start assist may not prevent the vehicle from
rolling downhill on a very steep or slippery slope, and
will not operate on small inclines.
Hill start assist is not a replacement for the parking
brake.
Hill start assist will operate even when VSA® is
switched off.
* Not available on all models
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