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Are you experiencing a specific , like headlights or a fuel pump not working, that you need to trace?

The network ports use a standard three-wire RS-485 configuration labeled + , - , and REF (Shield).

: Acts as an interface between the passenger compartment's Built-in Systems Interface (BSI) and various engine components such as the fuel pump, cooling fan, and starter motor. Communication : Integrates with the vehicle's CAN network for high-speed data exchange and command execution. Schematic and Internal Components

The module interfaces with the engine wiring harness through distinctly colored, keyed multi-pin connectors: