System Diagram

Fig 1: Air Conditioning System CAN Communication Diagram (1 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Transmitter	Receiver	Line	Signal
A/C Amplifier	ECM	CAN	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
			A/C (refrigerant) Pressure Sensor Signal
A/C Amplifier	Combination Meter	CAN	Outside Temperature Data
A/C Amplifier	DLC3	CAN	Diagnostic Tool Response
Main Body ECU	A/C Amplifier	CAN	Destination Symbol (Steering Wheel)
Combination Meter	A/C Amplifier	CAN	Vehicle Speed Signal
ECM	A/C Amplifier	CAN	Engine Coolant Temperature Signal
			Engine RPM Data
			A/C Control Cut-off Signal
			A/C-E/G Cooperation Control

Fig 2: Air Conditioning System CAN Communication Diagram (2 Of 2)