Thanks for your comments which helped me to solve this issue under an used car warranty : next week, I will fix the steering column thru an ex-Pontiac dealer, with the agreement of the salesman who sold me the Vibe (2010, 23000 miles), last week.

Thanks! It works great! ...and I got 4 winter tires for free : I just bought the Vibe (2010, 23000 miles) and when I told to the salesman that I agree to repair the radio (instead to replace it by an other one), he offered me 4 winter tires that he got from the previous owner of the Vibe.