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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 477 (Air Conditioning System - Diagnosis) >> Circuit Inspection >> Back Up Power Source Circuit >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

This is the backup power source for the A/C ECU. Power is supplied even when the ignition switch is off and is used for DTC memory, etc.

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