Your best bet is go to a place where they sell an install stereo systems an ask them . The factory radio on your vehicle is hooked up to the vehicles communication network . Class 2 serial data bus , if it's not done correctly the vehicle will not start an run !
The only way to unlock the radio is by using a scan tool.
The theft deterrent system is a feature on all base and uplevel radios. There is no need to program a security code into the radio as in past model years. The theft deterrent system now utilizes class 2 serial data to determine if the radio is in the appropriate vehicle. Each time the radio receives the "run" power mode message, it compares the VIN information it has stored to the VIN information received from a module on the class 2 serial data circuit responsible for transmitting that information. If a mis-match occurs, the radio display will indicate to the user the radio is locked. Once this takes place the radio will not respond to any button presses and become inoperative. The two scenarios able to cause this condition are:
?€¢
A radio is installed from another vehicle.
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A module which communicates on the class 2 serial data circuit which supplies VIN information to the radio is replaced and not properly setup with the correct VIN information for that vehicle.
The digital radio receiver utilizes class 2 serial data to determine if it is in the appropriate vehicle. Each time the digital radio receiver receives the "run" power mode message, it compares the VIN information received from the body control module (BCM) on the class 2 serial data circuit. If a mis-match occurs, the radio display will indicate to the user the digital radio receiver is locked. The digital radio receiver cannot be unlocked, it must be replaced. The two scenarios able to cause this condition are:
?€¢
A digital radio receiver is installed from another vehicle.
?€¢
The BCM is replaced and not properly setup with the correct VIN information for that vehicle.
SOURCE: unlock antitheft code for 2004 chevy impala
Radios in the 2004 Impalas are tied to the vehicle's VIN through the computer, so it may be somewhat difficult to get the code. However, the following steps should work:
1. Press and hold the buttons for presets 1 & 4 (may be 2 & 3). The word "SEC" should show.
2. Press the "MIN" button. "000" should be displayed.
3. Press the "MIN" button again to have the second two numbers appear. Record these numbers.
4. Press the "HR" button for the first two numbers to appear. Record these numbers. -- Note: Your number sequence should be the numbers from the "HR" button followed by the numbers from the "MIN" button.
5. Call 1-800-537-5140. This will get you to the GM unlock code automated line. Ignore the prompt and enter "202108#". Next enter your code (remember, HR then MIN) followed by the * key. For example, 1234*. A 3 or 4 digit code will be given to you. If you get a code such as 0532, drop the zero when entering it into your radio.
6. Enter the code into the radio IAW the applicable manual.
SOURCE: 2004 chevy trailblazer
2004 Chevy Trailblazer radio won't eject CD. Push the eject button and the thing just clicks and says "check CD" . Tried bulletin 04--8-44-020C (fuse removal and reinstall) didn't work. Any other suggestions before going to dealer?
SOURCE: 2004 Chevy Trailblazer radio and CD player works, but no sound
if you have installed a new cd player in there then the propblem could be that your speaker wires and either touching each other or grounding them selfs out.. pull of the cd player and check to make sure all the speaker wires are covered properly and no bare wires are exposed.. if you still have a factory cd player in it then you will probably need to take it to a dealership to have it checked out..
SOURCE: why wont my rear speakers work on 2004 chevy trailblazer
hello josh!!! I had the same problem, Have you made sure everything on rear is off? If so the front radio will have this headphone looking thing in the top left corner, plug ear phones in & turn rear on. then make sure rear radio is off. turn vehicle off then START it! that resets it.If that doesnt work check fuses!
SOURCE: 2004 chevy trailblazer fuse box diagrams
I have front and rear a/c. The air is blowing in the back but not in the front. Don I have 2 blowers/units. Could this be a fuse?
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