How do I proceed to get to the problen

What is your question?

Back up park assist does not chime . Checked fuse , it's fine . Replaced park assist module , GM 257580 still no chime . Put in reverse , no sound coming from any of the four bumper sensors . Head liner light does not light when putting it in reverse . What else can I check to solve this problem ?

How long has your 2007 Buick Rendezvous had this problem?

Three months