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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 47 (Hybrid Control System (For Lithium-Ion Battery) - Diagnostic Codes (4 Of 4) & Circuit Tests) >> HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY) >> ECU Power Source Circuit [08/2020 - ] >> Description

ECU Power Source Circuit [08/2020 - ]: Description

WARNING: This page is about a different car, the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, and 2021 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

If the power switch is on (IG), the hybrid vehicle control ECU applies current to the MREL terminal to turn the IGCT relay on. This supplies power to the +B1 and +B2 terminals.

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