This applies for 2004 Toyota Corolla System. Here you will find brief explanation on Corolla electrical system, for instance what is the condition on the lower speed operation of the AC system.

Toyota Corolla Air Conditioning System Wiring Diagram

Current is applied at all times through the HEATER fuse to TERMINAL 5 of the HTR relay. When the ignition SW is turned on, the current flows through the GAUGE fuse to TERMINAL 2 of the HTR relay to TERMINAL 1 to TERMINAL 6 of the blower SW.

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