Power locking doors, function PDF

A technical document that describes the power locking system for vehicle doors, specifically focusing on Mercedes-Benz models 215 and 220. The document details the operational mechanics of the system, including the interaction between various control modules and how signals are processed to lock or unlock doors. Specific instructions are provided for how the front door control unit manages signals from the key or remote transmitter. Additionally, the document outlines troubleshooting steps for common faults within the system and provides references to related technical bulletins.