Brad McKenzie

Found issus - I bought the truck used with no audio. Turns out someone put the wrong radio reciever in the truck. The receiver was for a truck without the Bose speakers and amp. A shop in MN helped me figure it out. The factory VIN wiring harness had been replaced with the LTZ harness. They did a good job, the harness all looks factory. Audio working great now with correct radio receiver.

Having an electrical shop check it out. Checking the telematics OnStar module as possible issue.

Does the amp you installed have a 1 or 2 ohm adjustment? Seems I read the factory bose is a 2 ohm system.

Radio – no audio · Radio head unit replaced – OEMRadio parts. Touch screen was inoperable. OEMRadio said radio has latest software · Amplifier replaced – OEMRadio parts Factory Bose system. Everything is factory New battery installed just after used purchase. Old battery tested bad. I was told truck sat for 3 years. 12V and ground good at Amp I hear chimes when ignition key turned on. Bluetooth connects to phone. CarPlay functions display on radio. No audio from phone or CarPlay either. DTC B1025-04,B1035-04,B1045-04,B1055-04 Speaker Audio Output Circuit - Open Current Radio (RADIO) Speakers and connections from amp test good. We bypassed the media disk player MOST bus. Radio screen worked, but still no audio. Possible something is not sending data to Amplifier? I guess possibility of new radio/amp are defective? I read the MOST bus connects to instrument cluster, radio, amp, HMI and possibly couple other modules. Most issues I see related to MOST bus is no radio screen display. Having a electrical specialty shop checking it out. Maybe something needs programmed?