The 90 Series remote control (with yellow battery test light) works only with door openers and light controls having an orange “Smart” button and a yellow indicator light. The code between the remote control and the receiver changes with each use, randomly accessing
over 100 billion new codes.

Programming instructions are described and illustrated below.

Security+ Garage Door Openers

To program the opener to accept the remote control code:

  1. Press and hold the remote control push button. See Figure 1.
  2. Press and release the “Smart” button on the opener panel. See Figure 2. The indicator light on the panel will begin to blink and the opener lights will flash once.
  3. Release the remote push button.

Now the opener will operate when that remote control button is pressed. Test it by pressing the remote button to see that the door goes up and down.

Adding a remote can also be done from the door control, as follows:

  1. With the door closed, press and hold the remote push
  2. Press and hold the Light button on the door control.
  3. Press and hold the door control push bar.
  4. After the opener lights flash, release all buttons.

Test by pressing the remote push button.

To Erase All Remote Control Codes

Press and hold the “Smart” button on the opener panel until the indicator light turns off (about 6 seconds). All transmitter codes are now erased. Then follow the steps above to reprogram each remote control.

Replacement Parts

Model 91LM Security✚ remote case, cover, screw . . . . . . . . . 41A5081
(circuit board not included)
12 Volt battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10A14


LiftMaster: Remote Control – Model 91LM Security+ Single Function Remote Control

  • Security+ Garage Door Openers
  • To erase all remote control codes:


Children operating or playing with a garage door opener can injure themselves or others. The garage door could close and cause serious injury or death. Do not allow children to operate the wall push buttons or remote controls. A moving garage door could injure or kill someone under
it. Activate the opener only when you can see the door clearly, it is free of obstructions, and is properly adjusted.

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