System Diagram

WARNING: This page is about a different car, the 2006 Lexus IS 350 and 2006 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: System Diagram (1 Of 3)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TRANSMITTER RECEIVER SIGNAL REFERENCE

Transmitter	Receiver	Line	Signal
A/C Amplifier	ECM	BEAN / CAN	Heater Relay Control Signal
			Magnetic Clutch Control Signal
			Rear DEF Relay Control Signal
			Idle Up Request Signal
			Heater Valve Open Signal
			PTC Driving Number Request Signal
			Outside Temperature Data
			A/C Pressure Sensor Signal
			External Variable Control Solenoid Current Signal
A/C Amplifier	Combination Meter	BEAN	Outside Temperature Data
A/C Amplifier	Multi-display, Heater Control Panel	BEAN / AVC-LAN	EMV-Indicator
A/C Amplifier	Multi-display, Heater Control Panel	BEAN / AVC-LAN	EMV-Temp. Indication
A/C Amplifier	Main Body ECU RH	BEAN	Diagnostic Tool Response
ECM	A/C Amplifier	BEAN / CAN	Engine Speed Signal
			Engine Coolant Temperature Signal
			Outside Temperature Data
			Inhalation of Air Temperature Data
			A/C Compressor Lock Control Signal
			Recycle Mode Switching Request
			A/C Control Cut Signal
			Variable Control Prohibition Signal
			A/C-E/G Cooperation Control
			PTC Heater Permission Number
Main Body ECU RH	A/C Amplifier	BEAN	Diagnostic Tool Request
Main Body ECU RH	A/C Amplifier	BEAN	Diagnostic Erase Signal
Combination Meter	A/C Amplifier	BEAN	Vehicle Speed Signal
Multi-display, Heater Control Panel	A/C Amplifier	BEAN / AVC-LAN	A/C Operation Signal

Fig 2: System Diagram (2 Of 3)

Fig 3: System Diagram (3 Of 3)