Homelink garage door opener will only work at very close range - i.e. whent he garage door is open or when the car is in the garage to open to garage door. Is there as RF sensor that could be obscured?

The following are steps to programming a rolling code door opener to the Homelink transmitter in the Touareg.

The instructions in the owner's manual are correct, but after following them, my garage door installer and I discovered a few quirks and fixes for them.

It is important to park the Touareg in front of the garage door. Be careful not to park underneath it.

If your remote garage door transmitters are already programmed to your door opener, you need to do the following steps:

1. On the garage door opener itself, there is a learn button. Press and hold down the learn button until the learn indicator light goes out (approx. 6 seconds). (The learn button is near the antenna on your door opener.) By doing this, you have just reset the codes. At this point your remote door transmitters will most likely not work. This is o.k.

2. In the Touareg, press and hold whichever homelink button you want to program until the light above the homelink buttons slowly blinks. Continue to hold the button in and at the same time, hold your remote transmitter underneath the map lights and press the button. Continue to press both buttons until the homelink light rapidly flashes. Let go of both buttons.

3. You now have 30 seconds to press the learn button on your garage door opener. Press it once. The light will start to blink.

4. Go back to the Touareg, press and hold the homelink button you just programmed for 3 seconds until you get a blinking light. Repeat again. This time, it should open or close the door. The homelink button is now programmed.

5. Now that the homelink button is programmed, you now have to re-program your remote transmitters. Take the transmitters with you.

6. On the garage door opener, press the learn button, the light will blink. Now press the button on the remote transmitter. The light should stop blinking. Repeat the step if you have more than one transmitter. You should be all set. The homelink button should work in the Touareg and your remote transmitter(s) should also work.

In summary, the rolling codes in the door opener receiver have to be reset. For some reason, the Touareg has to be programmed FIRST. Then the remote transmitter units. If the remote transmitter units are already programmed, you will most likely not be able to program the homelink in the Touareg for a rolling code door opener.

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Original Launch X-431 DIAGUN III

I hope this helps.

Programming the HomeLink Transmitter
Do not use the HomeLink Transmitter with any garage
door opener that does not have the stop and reverse
feature. This includes any garage door opener model
manufactured before April 1, 1982.
Be sure that people and objects are clear of the garage
door you are programming.
It is recommended that a new battery be installed in
your hand-held transmitter for quicker and more
accurate transmission of the radio frequency.
Your vehicle's engine should be turned off while
programming the transmitter. Follow these steps to
program up to three channels:
1. Decide which one of the three channels (one of the
HomeLink buttons) you want to program.
2. Press and hold the desired button on HomeLink
through Step 3.
3. When the HomeLink indicator light begins to blink
slowly (this may take up to 30 seconds), hold the
hand-held transmitter about 1 to 3 inches (3 to 8 cm)
away from HomeLink and then press and hold the
transmit button on the hand-held transmitter.
Continue to hold both buttons until the indicator
light on HomeLink begins to flash rapidly (this may
take up to 90 seconds).
If you have trouble programming HomeLink, make
sure that you have followed the directions exactly as
described and that the battery in the hand-held
transmitter is not weak. If you still cannot program it,
move the hand-held transmitter to the left or right or
forward or backward or flip it upside down. HomeLink
may not work with older garage door openers that do
not meet current Federal Consumer Safety Standards.
If you cannot program the transmitter after repeated
attempts, refer to "Training a Garage Door Opener with
Rolling Codes" later in this section or contact the
manufacturer of HomeLink at 1-800-355-3515,
or on the internet at www.homelink.com.
Be sure to keep the original hand-held transmitter in
case you need to erase and reprogram HomeLink.


Training a Garage Door Opener with a
"Rolling Code" Feature (If Equipped)
If you have not previously programmed the hand-held
transmitter to HomeLink, see "Programming the
HomeLink Transmitter" listed previously. If you have
completed this programming already, you now need to
train the garage door opener motor head unit to
recognize HomeLink.
1. Find the "Learn" or "Smartbutton" on the garage
door opener motor head unit. The exact location and
color will vary by garage door opener brand. If you
have difficulty finding the Learn or Smart button,
refer to your garage door opener owner's manual or
contact the manufacturer of HomeLink at
1-800-355-3515, or on the internet at
www.homelink.com.
Because of the steps involved, it may be helpful
to have another person assist in programming
the transmitter.
2. Press the Learn or Smart button on the garage
door opener motor head unit. An indicator light will
begin to flash when the motor head unit enters the
training mode.
Following this step, you have 30 seconds to
start Step 3.
3. Return to HomeLink in your vehicle and firmly
press and release the programmed HomeLink button
three times.
The rolling-code garage door opener should now
recognize HomeLink. You may either use HomeLink
or the hand-held transmitter to open the garage door.
If after following these instructions, you still have
problems training the garage door opener, contact the
manufacturer of HomeLink at 1-800-355-3515,
or on the internet at www.homelink.com.
www.gmcextendedwarranty.com

GOTO HOMELINK.COM

THEY MAKE THE SYSTEM AND HAVE INSTRUCTIONS YOU CAN DOWNLOAD.

PLEASE NOTE: NOT ALL BRANDS/MODELS OF OPENER WILL WORK WITH THIS SYSTEM.

HOPE THIS HELPS

Hyundai TSB 08-BE-012

PROCEDURE:
1. For first time training, press and hold the two outer HomeLink buttons, releasing
only when the HomeLink indicator light begins to flash after 20 seconds.
NOTE: Do not perform this step when training the additional HomeLink buttons.
2. Position the hand-held transmitter 1-3 inches away from the HomeLink mirror,
keeping the HomeLink indicator light in view.
3. Using both hands, simultaneously press and hold both the desired HomeLink button
and the hand held transmitter button.
DO NOT release until the HomeLink indicator light flashes slowly and then rapidly.
When the indicator light flashes rapidly, both buttons may be released. The rapid
flashing indicates successful training and the procedure is complete. This also
indicates that the garage door opener does not use rolling code technology.
Note: The garage door may open or close during this step.
Steps 4 through 7 are only necessary if the HomeLink button appears to be
transmitting after step 3, but the garage door does not operate.
4. Press and hold the trained HomeLink button and observe the indicator light.
If the indicator light is solid/continuous, training is complete and your device should
activate when the HomeLink button is pressed and released.
If the indicator light blinks rapidly for 2 seconds and then turns a solid/continuous light,
proceed with the following training instructions for a rolling code device. A second
person may make the following steps quicker and easier. It is recommended that a
ladder or similar device be used to obtain access to the motor housing. Do not stand
on the vehicle to perform the next steps.
5. At the garage door opener receiver (motor housing) in the garage, locate the “learn”
or “smart” button (usually near the hanging antenna wire attached to the unit). If
there is difficulty locating the training button, refer to the garage door opener’s
manual.
6. Press and release the “learn” or “smart” button (the name and color of the button
may vary by manufacturer).
NOTE: Once the button is pressed, there are 30 seconds in which to initiate the
next step.

7. Return to the vehicle and firmly press and hold the trained HomeLink button for two
seconds and release. Repeat the “press/hold/release” sequence up to 3 times to
complete the training process. If successful, your garage door should open or close
during this step.
If the vehicle owner continues to have difficulty programming their HomeLink mirror,
please have them contact HomeLink customer service directly at 1-800-355-3515 or
www.homelink.com for further assistance.
PROCEDURE COMPLETE

Good luck!

There was a minor change for mine to work.. see below..

- you must park your Prius close to the gate opener, leaving it running (obviously not in the way of the gate closing)
- Hold the button the the mirror and then push your garage door remote button and hold until the light on the mirror starts to flasyh fast. THIS programs the button on the mirror, but not the garage opener - yet (this was key for me)
- locate the "learning button" on the opener itself
- press the "learning button" on your gate opener and then get back into the Prius within 30 seconds (more time than it sounds) and press the SAME Homelink button you just programmed above. I don't recall how long I held the pre-programmed button, but the light will flash as I recall.
- Then, when working the garage door, you may need to hold the mirror button for a good second for it to work - but I had tried for months to get mine to work, and finally after reading many posts, the above sequence worked on my 2008 Prius with my Lift Master, Security + rolling codes garage opener.

Just - program the button on the mirror with your remote FIRST.. the garage opener will not work.. then use the Learn button on the garage opener and the SAME BUTTON you just programmed.. and it worked great for me. Not programming the mirror button first will not work. Using only the Learn button will not work. You must program the mirror first with the remote, then use the learn button and the SAME button on the mirror. Hope this helps.

Scott 2008 Prius with Lift Master Security + opener.
-

There are 3 programmable Homelink buttons you can use for different remotes. Just to the right of the buttons there is an indicator light.

Decide which button you want to program. Point the none battery end of your remote 1"-3" away from the Homelink panel and press both the remote and desired Homelink button down and hold them down at the same time. After about 20 seconds, the Homelink indicator light will change from a slow flashing to a rapid flashing. You can then release both buttons,
If the garage door responds to the Homelink, your done! If not, your garage door uses a rolling codes transmitter and must be trained.
Find the training button on your garage door opener's transmitter (usually mounted on the ceiling). Press the training button and within 30 seconds press and release the programmed Homelink button twice. If the garage door opener operates, you're done! If not, press and release the Homelink button a third time and the garage door should respond. If it still does not, you may have a very old garage door opener with a none digital transmitter (like I did). In that case, you either need to buy a new opener or try to replace the transmitter with a modern digital unit (as I did). Advantage: cheaper than a whole new garage door opener.
Disadvantage: The newer openers incorporate safety features that my old opener does not have.

Those buttons are for you to be able to program your garage door opener so that you don't need to have to original clipped to your visor all the time. The procedure is this: 1) put the key in ignition in postition 2 (car not running) 
 
2) hold down both homelink buttons on the outsides of the homelink transmitter (to reset any existing codes) you might have to do it for 20-30 seconds. Red light on homelink will flash rapidly then let go. 
 3) Now, with the garage remote in one hand and hold the button on the homelink you want to program (keep holding homelink until it pulses, not a rapid flash, takes about 20 sec.) While it is pulsing, hold down the garage opener as close to the homeling button as possible while depressing door opener button also.
 
Shortly after doing this you will see the homelink start to flash rapidly (this means it is learning the code). 
 
-  let go of both buttons once it is flashing rapidly and 
 
4) go to motor of door opener and hit the learn button (a light should turn on)
 
5)return to the car a press the homelink button you programmed once, twice, or maybe up to three times until you see garage door open/close.

You may need to have someone help you with this procedure.

1-800-355-3515
www.homelink.com

1. Position vehicle within 10 feet of garage door- engine off and battery on.

2. Press/hold 2 outside buttons of Homelink transceiver until red indicator starts flashing rapidly, then release button. This should take about 20 seconds. This erases any previously learned codes.

3. Press/hold remote control and press/hold button of Homelink transceiver simultaneously. Slowly move remote control from 5" away to 1" away from Homelink transceiver. Release both buttons after red indicator starts blinking rapidly. This should take about 5 seconds. I discovered that the Homelink in my TL is a bit faulty because it took much longer to accomplish this than when programming the Homelink in my MDX. My TL's Homelink may "unlearn" it's code in the future and the needed proximity of the TL to the garage door may be much closer than desired until I get the Homelink fixed.

4. Press training button on garage door opener unit until the indicator lights illuminates- this should be immediate.

5. Within 30 seconds press/hold the Homelink button for 2-3 seconds until the red indicator starts flashing rapidly. Repeat a second time. It should now be programmed. Check it by pressing the programmed button on the Homelink receiver.

6. When programming more than 1 garage door opener unit, disconnect power from unit before programming more units. By not doing this the programmed unit could conflict with the unprogrammed units commands.

Problems:

1. The Battery in the garage door remote may be too weak to program Homelink. However, the battery may be strong enough to operate the garage door. One of my remote controls had a weak battery- my system was installed today, fresh out of the box. I had to use the second remote control for the programming of Homelink on my 2 vehicles.

2. Antenna on the garage door opener unit must be hanging down, fully extended.

I don't think it's a problem with the homelink opener in your RX300. Try resynching it again with the garage door opener. Mine failed to work once and I just resynched and it's been OK for months now.