Question about 2004 Chevrolet TrailBlazer
I was a GM mechanic for years, your problem is in the module (radio) itself, the radio on newer GM vehicles also doubles for part of the computer on the vehicle, often controlling the door locks and headlights, it is common for the module to act up once in a while, sometimes you can have the module reprogrammed to fix the issue, but that takes a $2000 tech computer and a subscription to GM service site, which most people don't have, if you don't have access to this then i recommend you take it in to the dealer, often there will be an open bulletin (reprogram offered by GM) that can be done for no cost at all to you, but you have to ask them to look for any open reprograms for your vehicle, if this doesn't fix the problem you will have to replace the radio, and that will HAVE to be done at a dealer, because if you put a different radio (salvage part) in the vehicle that what the computer is programmed for, there is a good possibility that your computer will shut down and you will have to tow it to the dealer to get the computer programmed again.
Posted on Nov 10, 2008
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Posted on Jan 02, 2017
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Try this, put the key in the ignition and let it be on the first
turn right marked "ACC" or you can turn off the stereo and you will notice that
only the Digital Clock screen will show. Turn the Volume/Audio/Sel knob and press
on the "DISP" button simultaneously for about 4 seconds then release the "DISP"
button. The digital clock will start blinking, and then use the Tune/Seek
arrows pointing up and down to change the time. If the hour digit is blinking change
the hour and after you have changed it press "DISP" then the minute digit will
start to blink change it using the arrows, when you are done press "DISP" again
or leave the clock for between 4 to 8 seconds the clock will start working
I hope this works for you.
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