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Home >> Lexus >> 2003 >> GS 300 >> Repair and Diagnosis >> External Pages >> Different car >> Section 421 (Air Conditioning System - Diagnostics) >> Circuit Inspection >> Back Up Power Source Circuit >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2005 Lexus GS 430 and 2005 Lexus GS 300. 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 control assembly. Power is supplied even when the ignition switch is off and is used for diagnostic trouble code memory, etc.

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