One problem related to starter solenoid has been reported for the 2007 Chevrolet Trailblazer. The most recently reported issues are listed below.
All interior and exterior lights flash every second when engine rpm at 2000 and above. Radio occasionally has noise that changes with engine rpm, also stepping on brake pedal causes clicking noise over speakers when radio is playing. Service charging system warning on driver's console when temperature 80 degrees and above. Flashing started after chevy dealer replaced the underhood bussed electric center (ubec) which was suppose to resolve the service charging system warning and transmission interlock solenoid failing to let truck out of park.