I have a 08' SS HHR and installed the D3 with bypass, a Metra GMOS-LAN-04 harness, & Pioneer 7 Speaker setup. I soldered up everything just fine and when I press the Onstar button, it comes on but the D3 turns off. Once Onstar is finished the D3 powers back up. Is this normal?
I thought the radio just mutes and Onstar starts.