How was it changed?EChas3 said:On the 2005-7 models, the volume is controlled separately from Nav/Radio (but with the same control) and can only be adjusted during the call. Care must be exercised to adjust it only as loud as absolutely necessary or the other caller will hear echoes and distortion. I know it was changed in later model years, but I think that was the 2010-11 STS mop-up era.
In 2009 Bluetooth was added to the vcim for some Cadillac models like the DTS and SRX, however since the STS had Bluetooth through the radio it stayed that way to my knowledge.EChas3 said:I believe than changed it to run the OnStar module. I drive a 2006 1SG & my wife's car is a 2007, so I know what I've read about the newer models. I haven't test-driven any in quite some time.