Acura MDX 2018 Owner's Manual
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uuLocking and Unlocking the Doors uKey Types and Functions
Controls
The built-in key can be us ed to lock/unlock the 
doors when the keyless  access remote battery 
becomes weak and th e power door lock/
unlock operation is disabled.
To remove the built-in key, slide the release 
knob and then pull out the key. To reinstall 
the built-in key, push th e built-in key into the 
keyless access remote until it clicks.
■Built-in Key
Built-in Key Release Knob
Models with two-way keyless 
access remote
Release Knob
Built-in Key
Models without two-way keyless 
access remote
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uuLocking and Unlocking the Doors uLow Keyless Access Remote Signal Strength
Controls
Contains a number that  you will need if you 
purchase a replacement key.
Low Keyless Access Re mote Signal Strength
The vehicle transmits radio waves to locate  the keyless access remote when locking/
unlocking the doors and tailgate, or to start the engine.
In the following cases, locking/unlocking the doors and tailgate, or starting the 
engine may be inhibited or operation may be unstable:
• Strong radio waves are being transmitted by nearby equipment.
• You are carrying the keyless access re mote together with telecommunications 
equipment, laptop computers, ce ll phones, or wireless devices.
• A metallic object is touching or  covering the keyless access remote.
■Key Number Tag1Key Number Tag
Keep the key number tag separate from the key in a 
safe place outside  of your vehicle.
If you wish to purchase an additional key, contact a 
dealer.
If you lose your key and  you cannot start the engine, 
contact a dealer.
1 Low Keyless Access Remote Signal Strength
Communication between the keyless access remote 
and the vehicle consumes the keyless access remote’s 
battery.
Battery life is  about two years,  but this varies 
depending on regularity of use.
The battery is consumed whenever the keyless access 
remote is receivi ng strong radio wave s. Avoid placing 
it near electrical  appliances such as  televisions and 
personal computers.
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uuLocking and Unlocking the Doors uLocking/Unlocking the Doors from the Outside
Controls
Locking/Unlocking the  Doors from the Outside
When you carry the keyless access remote, 
you can lock/unlock the doors and the 
tailgate.
You can lock/unlock the doors and tailgate 
within a radius of about 32 inches (80 cm) of 
the outside door handle or tailgate outer 
handle.
■Using the Keyless Access System1Locking/Unlocking the Doors from the Outside
If the interior light switch is in the door activated 
position, the interior light comes on when you unlock 
the doors and tailgate.
No doors opened: The li ght fades out after 30 
seconds.
Doors and tailgate relo cked: The light goes off 
immediately. 2 Interior Lights  P. 206
1Using the Keyless Access System
If you do not open a door or the tailgate within 30 
seconds of unlocking the  vehicle with the keyless 
access system, the doors and tailgate will 
automatically relock.
You can lock or unlock doors using the keyless access 
system only when the power mode is in VEHICLE OFF.
Models without rear door touch sensor
Models with rear door touch sensor
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uuLocking and Unlocking the Doors uLocking/Unlocking the Doors from the Outside
Controls
■Locking the doors and tailgate
Press the door lock button on the front or 
rear
* doors, or on the tailgate.
u Some exterior lights flash; the beeper 
sounds; all the doors and tailgate lock; 
and the security system sets.
1Using the Keyless Access System
•Do not leave the keyless access remote in the 
vehicle when you get out . Carry it with you.
•Even if you are not carrying the keyless access 
remote, you can lock/unl ock the doors and tailgate 
while someone else with th e remote is within range.
•The door may be unlocked  if the door handle is 
covered with water in heavy rain or in a car wash if 
the keyless access remote is within range.
•If you grip a door handle  wearing gloves, the door 
sensor may be slow to  respond or may not respond 
by unlocking the doors.
•After locking the door, you  have up to two seconds 
during which you can pull the door handle to 
confirm whether the door is locked. If you need to 
unlock the door immediately  after locking it, wait 
at least two seconds befo re gripping the handle, 
otherwise the door will not unlock.
•The door might not open if  you pull it immediately 
after gripping the door handle. Grip the handle 
again and confirm that th e door is unlocked before 
pulling the handle.
•Even within the 32 inches (80 cm) radius, you may 
not be able to lock/unl ock the doors with the 
keyless access remote if it is above or below the 
outside handle.
•The keyless access remote may not operate if it is 
too close to the door and door glass.
The light flash, beep and  door unlock mode settings 
can be customized using th e information screen or 
multi-information display (MID). 2 Customized Features  P. 126, 358
Door Lock Button
Lock Button
* Not available on all models
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uuLocking and Unlocking the Doors uLocking/Unlocking the Doors from the Outside
144
Controls
■Locking the doors and tailgate (Walk 
away auto lock)
When you walk away from the vehicle while 
carrying the keyless acce ss remote, the doors 
will automatically lock.
The auto lock function  activates when all 
doors and tailgate are closed, and the keyless 
access remote is within about 5 feet (1.5 m) 
radius of the outside door handle.
Exit vehicle while carrying keyless access 
remote and close door(s).
1. While within about 5 feet (1.5 m) radius of 
the vehicle.
u The beeper sounds; the auto lock 
function will be activated.
2. Carry the keyless access remote beyond 
about 5 feet (1.5 m) from the vehicle and 
remain outside this range for 2 or more 
seconds.
u Some exterior lights flash; the beeper 
sounds; all doors and tailgate will then 
lock.1Locking the doors and tailgate (Walk away auto lock)
The auto lock function is set to OFF as the factory 
default setting. The auto lo ck function can be set to 
ON using the information screen or MID.
If you set the auto lock  function to ON using the 
information screen or the MID, only the remote 
transmitter that was used to  unlock the driver’s door 
prior to the setting change can activate auto lock. 2 Customized Features  P. 126, 358
After the auto lock function has been activated, 
when you stay within the locking/unlocking 
operation range, the indica tor on the keyless access 
remote will continue to  flash until the doors are 
locked.
When you stay beside the vehicle within the 
operation range, the doors wi ll automatically lock 
approximately 30 seconds after the auto lock 
function activating beeper sounds.
When you open a door after  the auto lock function 
activating beeper sounds, the auto lock function will 
be delayed until all doors  and tailgate are closed.
When all doors and tailgate  have been closed and the 
keyless access remote is insi de the vehicle, or if the 
keyless access remote is not  detected within about 5 
feet (1.5 m) of the vehicle,  auto lock function will not 
be activated.
You must wait until the pow er tailgate fully closes 
before the auto lock function will be activated.
The activation range of 
the auto lock function is 
about 5 feet (1.5 m)
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uuLocking and Unlocking the Doors uLocking/Unlocking the Doors from the Outside
Controls
To temporarily deactivate the function:
1. Set the power mode to OFF.
2. Open the driv er’s door.
3. Using the master door lock switch, operate 
the lock as follows:
Lock  Unlock  Lock  Unlock.
u The beeper sounds and the function is 
deactivated.
To restore the function:
• Set the power mode to ON.
• Lock the vehicle without using the auto lock 
function.
• With the keyless acce ss remote on you, 
move out of the au to lock function 
operation range.
• Open any door.1Locking the doors and tailgate (Walk away auto lock)
The auto lock function does  not operate when any of 
the following conditions are met.
•The keyless access remote is inside the vehicle.
•A door or the hood is not closed.•The power mode is set to any mode other than 
OFF.
•The keyless access remote is not located within a 
radius of about 5 feet (1 .5 m) from the vehicle 
when you get out of the vehicle and close the 
doors.
Auto lock function operation stop beeper
After the auto lock function has been activated, the 
auto lock operation stop beeper sounds for 
approximately two seconds  in the following cases.
•The keyless access remote is put inside the vehicle 
through a window.
•You are located too close to the vehicle.
•The keyless access remote is put inside the tailgate.
If the warning beeper sounds, check that you are 
carrying the keyless access  remote. Then, open/close 
a door and confirm the auto lock activation beeper 
sounds once.
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uuLocking and Unlocking the Doors uLocking/Unlocking the Doors from the Outside
146
Controls
■Unlocking the doors and tailgate
Grab the driver’s door handle: u The driver’s door unlocks.
u Some exterior lights flash twice and the 
beeper sounds twice.
Grab the front passenger’s door or rear
* door 
handle: u All doors and the tailgate unlock.
u Some exterior lights flash twice and the 
beeper sounds twice.
Press and hold the tailgate outer handle: u The tailgate unlocks and opens.
u Some exterior lights flash twice and the 
beeper sounds twice.
2 Opening/Closing the Tailgate  P. 162
1Using the Keyless Access System
When you go into the keyless access system working 
range with all the doors locked, the LED puddle lights 
come on for 30 seconds.
The lights do not come on  if you have previously 
stayed within the range for more than two minutes, 
or the doors have been locked for a few days.
The feature activates again after you drive the 
vehicle, then lock the doors.
You can also unlock and open with the power 
tailgate. 2 Opening/Closing the Tailgate  P. 162
Models with navigation system
Tailgate Outer 
Handle
* Not available on all models
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uuLocking and Unlocking the Doors uLocking/Unlocking the Doors from the Outside
Controls
■Locking the doors and tailgate
Press the lock button.
Once: u Some exterior lights flash, all the doors 
and tailgate lock, and the security system 
sets.
Twice (within five se conds after the first 
push):
u The beeper sounds and verifies the 
security system is set.
■Unlocking the doors and tailgate
Press the unlock button.
Once: u Some exterior lights flash twice, and the 
driver’s door unlocks.
Twice:
u The remaining doors and tailgate unlock.
*1: 
Checking Door Lock Status* P. 150
■Using the Remote Transmitter1 Using the Remote Transmitter
If you do not open a door or the tailgate within 30 
seconds of unlocking the vehicle with the remote 
transmitter, the doors and ta ilgate will automatically 
relock.
You can change the relock timer setting. 2 Customized Features  P. 126, 358
You can lock or unlock doors using the remote 
transmitter only when the power mode is in VEHICLE 
OFF.
The remote transmitter us es low-power signals, so 
the operating range may vary depending on the 
surroundings.
The remote will not lock th e vehicle when a door or 
the tailgate is open.
If the distance at which the remote transmitter works 
varies, the batter y is probably low.
If the LED does not come on when you press a 
button, the battery is dead.
2 Replacing the Button Battery  P. 613
You can customize the door unlock mode setting. 2 Customized Features  P. 126, 358
LED
Unlock 
Button Lock 
Button
LED
*1
Unlock 
Button Lock 
Button
* Not available on all models
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uuLocking and Unlocking the Doors uLocking/Unlocking the Doors from the Outside
148
Controls
If the lock or unlock button of the keyle ss access remote does not work, use the key 
instead.
2 Replacing the Button Battery  P. 613
Fully insert the key and turn it.
■Locking/Unlocking the Doors Using a Key1Locking/Unlocking the Doors Using a Key
When you lock the driver’s door with a key, all the 
other doors and tail gate lock at the same time. When 
unlocking, the driver’s door unlocks first. Turn the 
key a second time within a few seconds to unlock the 
remaining doors a nd the tailgate.
You can customize the door unlock mode setting. 2 Customized Features  P. 126, 358
Lock
Unlock
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uuLocking and Unlocking the Doors uLocking/Unlocking the Doors from the Outside
Controls
If you do not have the key on you, or if for some reason you cannot lock a door using 
the key, you can lock the door without it.
■Locking the front doors
Push the lock tab forward 
a or push the 
master door lock switch in the lock direction 
b, and close the door.
■Locking the rear doors
Push the lock tab forward and close the door.
■Lockout prevention system
The doors and tailgate cannot be locked when the keyless access remote is inside 
the vehicle.
■Locking a Door Without Using a Key1 Locking a Door Without Using a Key
When you lock the driver’s door, all the other doors 
and tailgate lock at the same time.
Before locking a door, make  sure that the key is not 
inside the vehicle. 
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