Can I collect my belongings from my vehicle at a impound lot if I have not yet turned myself in to the police?

Under circumstances of an ongoing criminal investigation with your vehicle being at the center of an alleged criminal act, you do not have the privilege to collect anything from your vehicle that is impounded. The vehicle may contain important evidence that investigators do not want tampered with or destroyed thus compromising their case. Hope this helps. I highly recommend that you immediately consult with a criminal defense attorney to discuss your legal rights before turning yourself in to the police.