IS LIFTMASTER 973LM COMPATIBLE WITH SEAR-CRAFTMAN 139.53635SRT MODEL?

No it is not compatable. You will need a craftsman remote or a universal remote

There is a small hole on the bottom of the unit. Take the pointed end of a pen and press it in the small hole.....that will help pop the cover open to replace the battery.

Without model numbers no one can possibly know.

Liftmaster and Craftsman are both made by Chamberlain Mfg. Co. Some controls are compatible and some are not the same as some Craftsman controls are compatible with that model number and some are not. The Liftmaster/Chamberlain control that works with that model opener is 81LM.

go to sear;s website

ONCE YOU REPLACE THE BATTERY YOU NEED TO REPROGAM THE REMOTE.

WATCH THE LED NEXT TO THE PROGRAM BUTTON WHILE YOU PRESS THE BUTTON ON THE REMOTE IF IT FLASHES THE REMOTE IS SENDING A SIGNAL AND SHOULD WORK.

IF IT DOESN'T FLASH THE REMOTE BATTERY MAY BE IN BACKWARDS OR THE REMOTE MAY BE BAD - IT IS NOT SENDING ANY SIGNAL AT ALL.

HOPE THIS HELPS

The code for the 5 blinks is "RPM sensor or motor overload". Make sure the door is free to move and the trolley isn't jammed against anything.

In 2005 the radio frequency of door openers was changed to 315mhz. If your opener is older than this then it is not compatible with your Toyota.

The remote does not have a lock button. If you have the 3 button wall control the lock button is on it.

Most likely a new logic board will be needed.