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Home >> Lexus >> 2017 >> IS 300 F Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 105 (Automatic Transmission System (Aa80E) - Diagnostic Codes (2 Of 2) & Circuit Tests) >> Automatic Transmission System >> TCM Power Source Circuit [11/2021 - ] >> Description

TCM Power Source Circuit [11/2021 - ]: Description

WARNING: This page is about a different car, the 2024 Lexus IS 500, 2023 Lexus IS 500, and 2022 Lexus IS 500. However, it is still accessible from the selected car via links, so may be relevant.

When the engine switch is turned on (IG), voltage from the ECM MREL terminal is applied to the EFI-MAIN relay. This causes the contacts of the EFI-MAIN relay to close, which supplies power to terminal +B of the TCM.

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