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.

CAN SIGNAL

Fig 1: Air Conditioning Amplifier Communication System Diagram (1 Of 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DIRECT LINE SIGNAL

Fig 2: Air Conditioning Amplifier Communication System Diagram (2 Of 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INPUT AND OUTPUT SIGNALS OF THE COMBINATION METER

Communication Signal	Sender	Receiver	Communication Line
MIL (Check engine warning light)	ECM	Combination Meter	Direct Line
Starter			CAN (CAN No. 1 Bus)
Test mode
Tachometer
Engine coolant temperature
Cruise indicator light
Cruise control warning
Sports shift reject buzzer request
A/T shift position
Set indicator light
Engine type information
Vehicle speed	Skid Control ECU	Combination Meter	Direct Line and CAN (CAN No. 1 Bus)
ABS warning light			CAN (CAN No. 1 Bus)
Brake warning light
Slip indicator light*1
VSC off indicator light*1
TRAC off10 or TRC off11 indicator light
Parking brake
Each door courtesy switch	Main Body ECU	Combination Meter	CAN (CAN No. 1 Bus)
Driver side seat belt buckle switch
Parking brake switch
Wireless buzzer
Sliding roof*4
Sliding roof warning buzzer request*4
Front passenger side seat belt buckle switch	Center Airbag Sensor Assembly	Combination Meter	CAN (CAN No. 1 Bus)
SRS warning light
Front passenger side seat condition
Diagnosis information	Center Airbag Sensor Assembly	Combination Meter	CAN (CAN No. 1 Bus)
	ECM
	Skid Control ECU
	Power Steering ECU
EPS warning light	Power Steering ECU	Combination Meter	CAN (CAN No. 1 Bus)
Vehicle speed	Combination Meter	Air Conditioning Amplifier	CAN (CAN No. 1 Bus)
		Certification ECU
		Power Steering ECU
		Center Airbag Sensor Assembly
		ECM	Direct Line
		Radio Receiver
		Sliding Roof Control ECU*4
		Tire Pressure Warning ECU*6
		Main Body ECU*7
		Navigation Receiver Assembly*8
		Stereo Component Amplifier*9
Illumination	Combination Meter	Main Body ECU	CAN (CAN No. 1 Bus)
Vehicle specification	Combination Meter	Air Conditioning Amplifier	CAN (CAN No. 1 Bus)
Smart key indicator light*7	Certification ECU	Combination Meter
Fuel level	Fuel Sender Gauge Assembly	Combination Meter	Direct Line
Turn indicator light	Turn Signal Flasher	Combination Meter	Direct Line
High beam indicator light	H-LP HI Fuse	Combination Meter	Direct Line
Front fog indicator light*5	FR Fog Relay	Combination Meter	Direct Line
Outside temperature	Outside Temperature Sensor	Combination Meter	Direct Line
Brake fluid level	Brake Fluid Level Warning Switch	Combination Meter	Direct Line
Charge warning light	Generator	Combination Meter	Direct Line
Oil pressure warning light	Oil Pressure Switch	Combination Meter	Direct Line
Washer level warning light*3	Washer Level Warning Switch	Combination Meter	Direct Line
Tire pressure warning light*6	Tire Pressure Warning ECU	Combination Meter	Direct Line
Front passenger side seat belt warning light	Combination Meter	Telltale Light Assembly	Direct Line

*1: w/ VSC
*2: for U.S.A.
*3: w/ Washer Level Warning Light
*4: w/ Sliding Roof
*5: w/ Front Fog Light
*6: w/ Tire Pressure Warning System
*7: w/ Smart Key System
*8: w/ Navigation System
*9: for Separate Type Amplifier System
*10: w/ Occupant Classification System
*11: w/o Occupant Classification System