I've installed a Delco RDS radio with a CD player in a 2005 Chevy SIlverado. The radio indicates "LOCKED".One GMC dealer tried to unlock the radio using the Tech II scanner/reader. No luck. The radio wouldn't "talk" to the scanner. Another service manager at another GM dealer told me that this is a problem. Six car/truck radios he has had in his shop within the last month have been almost impossible to unlock. Each time the customer was charged $75.00 regardless of whether the radio was unlocked. This manager said they had talked to GM technical people without luck. He blames the problem on the body control module. GM needs to do better than this- I certainly expect better. A perfectly good and expensive radio is useless while locked.Is GM trying to force people to not buy their radios?Does anyone out there have better technical skills than the delaers I've spoken with?Or is there someone at GM who can provide technical assistance to address this problem?Thanks for your input.