The instructions in the manual are clear, I just can't get the light on the mirror to start blinking as it's supposed to. Some people have said it's a matter of holding the button pressed (or depressed as some say, or "mashed" as we say here in the south) for an inordinately long time.
I figured the frequencies we not compatible since I can't get the light to blink.
I may try it again, but I have a feeling it's a matter of finding a universal remote that can be programmed into the car, and then "learned" by the garage door opener.
If your MB is 2000 model year or newer, the instructions in the manual sometime does not work. Here are some steps I did for my MB car :
1. Park you car on your driveway, or in the garage (it does not matter),key in position# 2, hit & hold the button (1 of 3 buttons) that you intend to program you garage opener, the yellow tiny light will flash a few time, then stop (this step is to wipe out the code already in your car)
2. If you garage opener had a rolling code, on side of the opener, there is a little door, take that little door out, you will see a RED (square) button (the sharp & color of the button may be dìfferent depend on the brand SEARS, Liftmaster, Genie.....) but all are made from 1 company Genie. Hit that red button (LEARN), the light on the opener will FLASH. Within 30 second, get in your car (Key still position # 2), Hold the button (1 of the 3 on the mirror of your choose) you will see the tiny yellow light on the mirror flash a couple of time, at the same time the light on the garage opener unit will lit up SOLID. You are DONE of programming the garage opener. You can try it now, it should open & close your garage.
The LEARN button on the garage opener do not mention on the manual, I try to use the remote control keypad, it does not work, until I learn this method, it work everytime I change the car !!!!!!.Good luck.