If your garage door comes equipped with "rolling codes" (meaning it uses several codes to enhance security) the basic programming steps won't work for you. I figured this out about mine after several attempts of the basics; I thought I must have been missing a step. I've scanned the owner's manual pages for your reference. Let me know if you have any problems with the link...

file:///C:/Documents%20and%20Settings/bwhite/My%20Documents/Homelink.htm

 

Thats a file not a link, find an uploading site on the web and upload the file and then repost with the link it gives you. Let me know if you need help finding an uploading site.

 

Hello I just found this link:
http://en.allexperts.com/q/Land-Rove...buttons-LR.htm
The directions are similar. I'll paste them in to the forum:

Land Rover HomeLink
HOMELINK ® TRANSMITTER*
The Land Rover HomeLink ® Universal

Transmitter is built into the underside of the rear view mirror and provides a convenient way to replace up to three hand-held transmitters with a single built-in device. This innovative feature will learn the radio frequency codes of most current transmitters to operate garage doors and gates. With the available accessory
package, the HomeLink ® Transmitter can also control home or office lighting and security systems. For reliability, the HomeLink ® Transmitter is powered by your vehicle’s
battery and charging system.

Precautions
When programming your HomeLink ® Transmitter, you will be operating the garage door or gate. Be sure that people and objects are out of the way, to prevent potential harm or
damage.

WARNING
Do not use this HomeLink ® Transmitter with any garage door that lacks safety ‘stop’ and ‘reverse’ features, as required by federal safety standard (this includes any garage or door opener model manufactured before April
1, 1982). A garage door opener which cannot ‘detect’ an object in the path of a closing door and then automatically ‘stop’ and ‘reverse’ the door, does not meet current federal safety standards. Using a garage door opener without these features increase the risk of
serious injury or death. For more information on this matter, call toll-free: 1-800-355-3515.

Programming

If after repeated attempts you do not successfully program the HomeLink ® Transmitter to learn the signal of the hand-held transmitter, call toll-free for customer
assistance: 1-800-355-3515.

1. If you have previously programmed your HomeLink ® Transmitter, proceed to step 2. Otherwise, hold down the two outside buttons on the HomeLink ® Transmitter
until the amber light begins to flash. Release both buttons.
2. Decide which one of the three channels you want to program.
3. Hold the end of your hand-held transmitter against the HomeLink ® Transmitter (underside of the mirror) so that you can still see the amber light (see illustration).
4. Using both hands, push the hand-held transmitter button and the desired button on the HomeLink ® Transmitter. Continue to press both buttons through step 5.
5. Hold down both buttons until you see the amber light on the Land Rover HomeLink ® Transmitter flash, first slowly and then rapidly. It indicates that you have successfully programmed the HomeLink ® Transmitter to learn the new frequency signal. Release both buttons once the
rapid flashing begins.

Operating the Land Rover HomeLink ® Transmitter

Once it is programmed, the HomeLink ® Transmitter can be used in place of your hand-held transmitter(s). To operate, simply press the appropriate button on the HomeLink ® Transmitter. The amber light comes on while
the signal is being transmitted.

NOTE: If your hand-held transmitter appears to program the HomeLink ® Transmitter, but does not open your garage door and, if your garage door was manufactured after 1995, your garage door opener may have a ‘code protected’ or ‘rolling code’ feature.

A ‘rolling code’ type of system will change the ‘code’ of your garage door opener every time you open or close your garage door.

To determine if you have one of these systems, depress the button on your HomeLink ® Transmitter that you programmed. If the amber light on the HomeLink ® Transmitter flashes
rapidly for 1-2 seconds, then turns solid, your garage door opener has a rolling code system.

Training a garage door opener equipped with ‘rolling codes’

To train your ’rolling code’ garage door opener to operate from your HomeLink ® Transmitter, follow these steps:
1. Program your hand-held transmitter to the HomeLink ® Transmitter by following the procedures outlined in ‘Programming’, page 97 (if you already completed this
programming, proceed to the next instruction).
2. Train your garage door opener receiver to recognize your HomeLink ® Transmitter: (your garage door opener receiver will learn to recognize the HomeLink ®
Transmitter by following the same process used to train the hand-held transmitter)
a) Remove the cover panel from your garage door opener receiver (the receiver should be located by the garage door
motor).
b) Locate the training button on the garage door opener receiver. The exact location and colour of the button may vary by garage door opener brand. If you have difficulty locating the training button, reference your garage door opener manual, or call 1-800-355-35215.
c) Press the training button on the garage door opener receiver for 1-2 seconds.
d) Return to the HomeLink ® Transmitter in the vehicle and depress the programmed HomeLink ® Transmitter button for the duration of the rapid flash of the HomeLink ® ’ amber light, (1-2 seconds). Release the button and depress the button to confirm that the HomeLink ® Transmitter has been trained to the receiver.
e) Your garage door opener should now recognize your HomeLink ® Transmitter. You may use either your HomeLink ®
Transmitter or your original hand-held transmitter to open your garage door.

If after following these suggestions you still have difficulties programming your HomeLink ® Transmitter, call toll-free for customer assistance: 1-800-355-3515.

Erasing channels
To erase all three programmed channels, hold down the two outside buttons until the amber light begins to flash, then release both buttons.
Individual channels cannot be erased, but can be reprogrammed using the procedures for programming the HomeLink ® Transmitter (steps 2 through 5).

NOTE: Be sure to retain your original transmitter for future programming procedures (i.e. new vehicle purchase).

 

You may need to call Homelink and tell them the year of your Disco and the brand of garage door opener. I have a 97 Disco and a 2006 garage door opener and the Homelink in my Disco is too old to work with the newer door opener.

 

I had this same problem with my '97. I got a Homelink from a Disco II and I was able to then read the rolling codes fine. I then turned around and sold my Disco I Homelink on ebay so I pretty much came out even. Just a thought for you.

 

Follow up to my post yestarday! The directions I posted worked perfectly on my 2000 Disco 2. I held the button I wanted to program and my garage door button at the same time. Same worked for both of my doors. Hope this info helps someone else.