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“Installed a Sony AX-4000 head with the PAC interface. Once the Radio is invoked I have to Mute the sound to silence the Radio. Radio still switched ON between auto trips. Does anything in the PAC interface control the power to the radio?”

Asked by sweetThang 
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PAC - Radio Replacement and Steering Wheel Control Interface with OnStar Retention for Select GM Vehicles - Blue-Front_Standard
PAC - Radio Replacement and Steering Wheel Control Interface with OnStar Retention for Select GM Vehicles - Blue

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