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Home >> Lexus >> 2025 >> NX 350h >> Repair and Diagnosis >> External Pages >> Different car >> Section 35 (Engine Control System - Diagnostic Codes (U1103-U115C) & Circuit Tests) >> SFI System >> Starter Signal Circuit [11/2021 - ] >> Description

Starter Signal Circuit [11/2021 - ]: Description

WARNING: This page is about a different car, the 2025 Lexus NX 250, 2024 Lexus NX 250, 2023 Lexus NX 250, and 2022 Lexus NX 250. However, it is still accessible from the selected car via links, so may be relevant.

While the engine is being cranked, current flows from terminal STAR of the certification ECU (smart key ECU assembly) to terminal STA of the ECM (STA signal).

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