Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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My garage door sytem was working fine. I lost a remote, so after getting a new one, I programmed it into the door opener. After that, i found the remote I programmed worked, but my wife's remote did not. After programming both of them together, they both worked fine. However, then I discovered the keyless entry (139.53684) wouldn't work.The backlights in the case don't light and seem like it is not getting any power whatsoever even though I have changed batteries on it. Thank you for any help you can give. Ted

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Ted, it sounds like normal garage door function. Here is my take, you were pushing the button in a fashion that was to clear all remotes. This is done through either pushing wrong button, or pressing the programming button for too long.

Sometimes you need an assistant to be able to activate the wireless key, soon enough after pressing programming button. Get a ladder and a light, climb up and read the directions carefully on your opener. Try to add just the keyless system.

If that does not work,Get an assistant, and do the whole process again, including the keyless.

There are two distinct processes, adding and clearing, and it may be easy to invoke the wrong one.

Your system uses rolling code/invite system. Rolling code relates to a handshake betewen each remote and the base. The code is changed at each use, for each remote. (the keyless /wireless also).

Been there, done this. all for an additional second or two of button press.

Posted on Oct 16, 2010

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I was having a problem with the remotes. Program one remote, and the other stops working and vice-versa. I found the solution to be as follows: Using 61LM single-button remotes for Lift-master WhisperDrive (belt drive) garage door opener, I set the dipswitches (find them by removing battery replacement cover) to identical settings in both remotes. Set the first dipswitch to the neutral (0) setting. Next -- and this is the important part -- press the learn button on the main door opening unit, and, while the small LED light is lit, press the button on ONE of the remotes. DO NOT REPEAT ON THE SECOND REMOTE. Upon doing this, I found that BOTH remotes at last worked. I then went on to program a keyless entry pad, which was accomplished by again pressing the learn button on the main unit, and then entering the number sequence I had chosen for my entry code on the keypad, and pressing Enter. Both remotes continued to function and the keypad functions as well.

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