I have a 2003 SC430 and for no apparent reason a very long 1.5 foot crack appeared on the windshield. I was having the back bumper replaced at a body shop. The owner of the shop said the car wasn't jacked up or anything. They washed it after replacing the bumper and while moving it into the stall they noticed the very long crack that wasn't there 10 minutes ago. It starts on the driver's side top, center and ran straight down then curved at the center of the glass towards the middle of the glass. I just read a thread about stress fractures in the windshield in the GX470 Forum so I will call Lexus's Service Department to look into it being a Stress Fracture.
Went to Lexus - They said stress fractures usually start from the bottom of the windshield. They took it to their Professional Glass shop. (Ace Glass Shop off of Ward Avenue) to be inspected. The expert there said it appears to be a stress fracture. He saw one start from the same place. At that point in the center of the driver's side at the top of the glass, there is a clip that sits under the windshield. He could tell because the glass break at that point was popped up a little and was smoother at the tail end in the center of the windshield.
Out of warranty so the body shop will have it replaced.
