Clarion Px-3994a-a Manual [verified] (macOS)

Beyond the wiring, the manual contains the reset procedures and error code explanations (such as CD mechanism errors) that aren't printed on the chassis label.

: Many OEM units require a Radio Code if the battery is disconnected. This code is typically found on a card in the glovebox or provided by the dealership. Wiring and Installation Safety Clarion Px-3994a-a Manual