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Home >> Lexus >> 2003 >> GS 300 >> Repair and Diagnosis >> External Pages >> Different car >> Section 421 (Air Conditioning System - Diagnostics) >> Circuit Inspection >> Compressor 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.

The A/C control assembly outputs the magnetic clutch ON signal from terminal MPX+ to the ECM. When the ECM receives this signal, it sends a signal from terminal ACMG and switches the A/C magnetic clutch relay ON, thus turning the A/C compressor magnetic clutch ON.

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