So is there any definitive information on getting this to work reliably? I have searched old topics and people hem and haw around the issue.

I have seen it work on my car with both eyes, so I know its possible... but it doesnt seem to work reliabily. I have "reset" the windows by rolling them down and then rolling them up and holding for a few seconds.

Any advice?

 

you gotta hold the key directly in front of the driver side door handle and hold down continuously without letting go

 

That's how I do it. Right in front of the sensor.

 

Been there done that. I know the batteries in my key are good as I can lock/unlock from 50ft.+. I know the sensor on the handle uses IR and not RF...

 

thats what i do and it works fine for me...

 

LOL, mine doesn't work that well either... I get stuck at the parking lot and having people look at me weirdly as I constantly press and hold the Lock button to roll up the window.

 

Hi ,everybody,

I am a newbe I have a W209 270 cdi.

I have the same problem can't open the windows with the key, it is due to the sensor.
I can't open the locked door using the handle having the key in the pocket as I can on the right side door.
So I am in the way to remove the door panel and check the conectors, before thinking of buying a new sensor unit.
Does nayone did that job ?

 

Try fresher batteries. Lock/unlock from 50 ft.+ is RF, which takes less battery juice. The IR function takes fresh batteries and close contact.