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Your stereo got borrowed ? Isn't that interesting . By pass what ? do you know ? Factory stereo ?
The radio is enabled/disabled by class 2 messages from the body control module (BCM). The radio routes audio signals from the digital radio receiver or the vehicle communication interface module (VCIM) to the speakers and/or amplifier when directed by class 2 messages.. No way to by pass
I also have a 2004 Impala with the same problem. I searched the computer and found that a connection in the wiring under the carpet and behind the passenger seat gets corroded from the floor being wet. I'm in the process of removing seats and carpet to find this problem and hopefully fix it. I'm sure that your door chime quit working too.
WOW I think someone is very confused here.
The key fob & radio do not have anything in common. The first thing I would do is go to your local Chevy dealership parts department and give them the complete vehicle identification number. He can look up your vehicle to see if GM build you car with GM factory keyless entry system. If GM buiilt you car with keyless entry you'll need to have the service department program the key fob to the car. (This is not done through the radio, I've work for GM for 30 years, this is not how they built it)
If your radio needs to programed, that is done through the radio. 2 seperate circuits.
Maybe you should look at going to another Chevy store, I don't think the first one the advisor new what he was talking about.
Check the radio fuse? Box is drivers side end of dash(drivers door open)or pass side end of dash(passenger door open)
police models have a connection for the speakers (passenger floorboard under floor mat) to connect the speakers to the police radios.
If they had the speakers connected to their radios,they may have unhooked them and not connected them back to the radio.
The wires are brown,grey,blue and light blue.All into a blue connector.
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.