@Carlosramdango Next time you are out and about and you hear the rattle from the "A" pillar trim, try this.
When you hear it rattling, apply pressure to the white speaker grill at the bottom of the trim.
Does it cure the problem - If so, I fixed mine in the following manner.
The below was taken from another forum page, from myself.
"I have ( along with a few others) have this very same issue."
At first I though it was the actual "A" pillar white trims rattling.
But then after a while, I discovered the rattle was something inside of the speaker grill.
It was a little less on the passengers side, but it did affect both sides of the car.
By tapping on the speaker grill with the back of your knuckles, I could reproduce the rattling noise even when the car was at a complete stand still.
I decided to remove the speaker grill with a small trim tool and then disconnected the speaker wire connecter ( you do not have to remove the enter white trim, just the speaker grill itself ).
With the speaker trim and speaker removed ( with speaker still inside ) by shaking the trim from side to side, you can hear the metal body of the speaker rattling inside of the plastic trim.
When I unclipped the speaker, I was surprised to see that the speaker had no gasket fitted and the speaker was clearly loose in the speaker surround.
You can then remove the speaker and fit either some thin felt or even apply a very thin strip of electrical tape around the edge of the speaker surround.
This will stop the speaker rattling around in the plastic surround.
Refit the speaker to the surround and repeat the shaking from side to side test.
Rattle now gone.
Reconnect the speaker wire and refit the speaker to the white "A" pillar trim, it just snaps back into the "A" pillar trim - Done !.