Car used is a bmw e65 e66 same process for other bmw makes and models also should be the same on mercedes benz cars and suv s as well.
Set up garage door opener bmw x3.
Enter your garage and locate the garage door opener.
Insert the key and turn the key until all the gauges light up without starting the car.
The remote garage opener in the bmw models is located near the moonroof switch or under the rear view mirror.
This could potentially clear anything programmed to the garage door opener.
Repeat this button press three times.
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Once located press the learn or smart button on the back of the device.
Important when programming a garage door with an alternating security code be careful to not press and hold the programming button on the garage door unit.
Continue to hold down buttons 1 and the button on your remote garage door opener until light stops flashing.
Return to your bmw within 30 seconds then press the homelink button for two seconds.
Make sure your bmw is either inside or outside of the garage and not under the garage door.
While continuing to hold button 1 press the button on your garage door remote until the light on the left of button 1 will flashes fast.
There will be 3 buttons numbered 1 2 3.
I show you how to program your garage door opener memory button on your bmw.
Step 1 press and hold button 1 until light on the left of button flashes slow.