One problem related to sun roof has been reported for the 2004 Chevrolet Trailblazer. The most recently reported issues are listed below.
On about 6 occasions over the past couple weeks my sunroof has opened by itself. On each occasion it has happened after backing up and then putting it in drive. When it happens I try to stop it by pressing the close button but it doesn't do anything and continues to open fully and stops. After about 20-30 seconds I can close it.