A 2003 Chevrolet Trailblazer with radio problems is frustrating because it is difficult to determine what causes the problem. Technical service bulletins (TSB) and consumer reports show that most of the radio problems stem from electrical problems in the Trailblazer. The only radio problem which is not attributed to the electrical system is the compact disc (CD).
The Onstar system on the 2003 Trailblazer may affect the operation of the radio and other electrical accessories. The radio may not operate because the Onstar system, which runs through the radio, is remaining in the "On" position. The radio speakers are used by the Onstar system like a receiver on the telephone. Since the speakers are open, the radio does not work.
The 2003 Trailblazer has fuses located under the hood of the vehicle as well as smaller fuses under the dash. A 125-amperes (amp) fuse under the hood of the Trailblazer controls many of the interior accessories of the Trailblazer, including the radio. The fuse may blow when the vehicle is jump-started, affecting the radio operation.
The wiring harness that is located under the dash of the 2003 Trailblazer can cause problems with radio operation. The main problem with this wiring harness is the connections. According to the TSB published by the manufacturer, the wrong size connection are installed on some Trailblazers. These connections do not provide enough voltage and amps to operate the radio.
A TSB published on the 2003 Trailblazer concerns the volume feature on the radio. The volume control may not work because the contacts inside the radio volume feature are not making contact. When the volume feature is pressed, the distance between the contact points is too large to make contact and this prevents the radio volume from being raised or lowered.The only correction for this radio problem in the Trailblazer is to have the radio repaired.
Consumer reports on the 2003 Trailblazer concern the CD player on the radio. According to these reports, the CD player may not eject or accept CDs. No specific cause is attributed to this radio problem. The only correction for this radio problem is to replace the entire radio assembly.
