My 2004 GMC Envoy XUV has the factory radio. It is turned off but has a high pitched noise when the vehicle is first turned on. It does the same when furst turned off. It appears to be sending vehicle diagnositc checks through the radio speakers in the form of static or high pitch hum and sometimes both. Tried to get a new radio installed and vendor stated it was not the radio but a different problem. Please advise.
In my opinion, it's almost certainly the radio. Even when turned off, it is still alive managing a few other things (like chimes) until you exit the vehicle, and I suspect that part of the radio is faulty.
SOURCE: replacing factory radio
With that year vehicle it is recommended that you use a special harness because it has an factory amp and in order to get the proper wiring it requires the harness also if you don't use the harness you will loose your onstar and vehicle chimes and warning sounds.
SOURCE: factory radio wiring color codes
Here ya go. enjoy!
2002 GMC Sierra C1500 Car Radio Wire Color Codes
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black/White
Car Radio Illumination Wire: Brown
Car Stereo Dimmer Wire: Gray
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: Under the center console.
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue
SOURCE: cd not ajection
Welcome to the world of gm delco radios. I am a used car dealer in Canada and I deal mostly in trucks and suv's. Honestly I'd say 75% of the radios in Gm's don't work properly, the loading mechanism gets jammed when you try to eject and "check CD" appears. Unfortunately it's not the CD, and to save yourself any further heartbreak, rip the player out and get yourself a good quality Kenwood or the likes.
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It is actually coming from the speakers and not the engine compartment. I realize the radio is how the door chime and other things are amplified. This is as if a diagnostic check (that should be silent) that the Envoy does upon starting and shutting the engine down is amplified through the radio speakers. The static is a constant when the radio plays thus is not worth trying to listen too. The high pitch is usually less than 2 minutes upon starting and turning off.
The radio does not just amplify the chimes - it creates them. All vehicle health checks are made by the ECM and BCM digitally accessing memory locations in the various computers (and the radio) via the data link, and eventually turning on the IPC MIL light if the error is serious. A good first check is to look for error codes using a code reader.
It is possible that the radio antenna is picking up the datalink signals (crosstalk) and that is what you are hearing - disconnect the antenna at the back of the radio and see if the noise continues. If it does, the crosstalk is in the radio itself (a failure inside it); otherwise an antenna repair is in order.
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