One problem related to turn signal flasher unit has been reported for the 2003 Chevrolet Trailblazer. The most recently reported issues are listed below.
No specific event that I can see lead to failure. The failure was in the turning signal of the 2003 Chevrolet Trailblazer. The turning signal worked normal at times, but at other times it will flash at 2-3 times the normal flashing speed. Nothing has been done to replace the part.