2008 outlook. Put the factory radio (UVA) in. Everything works normally except no audio on any speaker. no turn sig click clack and no warning chime. Took connector off X2 on radio. This connector has all of the rear speaker wires plus pin 8 is an audio mute to amplifier. all speakers in front work fine. turn sig noise is there as is the chime. Does anyone know what generates the audio mute signal?