System Diagram

WARNING: This page is about a different car, the 2011 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Heating/Air Conditioning System Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Transmitter	Receiver	Line	Signal
A/C Amplifier	ECM	CAN	Magnetic Clutch Request Signal
			Heater Idle Up Request Signal
			A/C Idle Up Request Signal
			Outside Temperature Data
			External Variable Control Solenoid Current Signal
			Prior A/C Control Request Signal
			Refrigerant Gas Pressure Sensor Signal
			Motor Cooling Fan Drive Request Signal
			Acceleration Cut Inhibit Signal
A/C Amplifier	DLC3	CAN	Diagnostic Tool Response Signal
A/C Amplifier	A/C Control Assembly	LIN	A/C Operating State Signal
Main Body ECU	A/C Amplifier	CAN	Destination Symbol (Steering Wheel)
Combination Meter	A/C Amplifier	CAN	Vehicle Speed Signal
Combination Meter	A/C Amplifier	CAN	Outside Temperature Data
ECM	A/C Amplifier	CAN	Engine Coolant Temperature Signal
			Engine RPM Data
			A/C Control Cut-off Signal
			A/C-E/G Cooperation Control Signal
A/C Control Assembly	A/C Amplifier	LIN	A/C Operation Signal

Fig 2: Identifying Air Conditioning System (for Automatic Air Conditioning System) System Diagram