Toyota Yaris: Cxpi Communication System / System Description

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Power Source & Network / Networking / Cxpi Communication System / System Description

SYSTEM DESCRIPTION

CXPI COMMUNICATION SYSTEM DESCRIPTION

The multiplex communication system [CXPI] is used for communication systems between body system components. When communication fails due to an open circuit, etc. on the communication line, the function that outputs a DTC related to the circuit according to the control master ECU and the fail-safe function that maintains minimum performance and protects the system activate. (The following shows the communication system and connected ECUs.)

HINT:

Each component has a fail-safe function which activates to maintain the minimum performance of the system and protect the system.
In the following table, "○" indicates that the function applies, and "-" indicates that it does not.

Component	Master Control	CXPI Communication DTC Output Function
Main body ECU (multiplex network body ECU)	○	Output function enabled
Semiconductor power integration ECU	-	Output function disabled
Power distribution box assembly	-	Output function disabled

LOAD OPERATION OUTPUT

(a) Controls the load on and off based on multiplex communication signals.

Load		Semiconductor power integration ECU	Power distribution box assembly	Supports operation signal communication
Light control LED ECU RH Light control LED ECU LH		●	-	Not supported
Fog light assembly RH Fog light assembly LH		●	-	Supported
Rear window defogger Mirror heater		-	●	Supported
Rear window defogger Mirror heater		-	●	Not supported
Rear taillight		-	●	Supported
Rear fog light LED		-	●	Supported
Outer rear view mirror assembly RH (outer mirror retractor RH) Outer rear view mirror assembly LH (outer mirror retractor LH)		-	●	Supported
Panel light		-	●	Supported
Blower motor with fan sub-assembly		-	●	Not supported
Front seat heater RH (w/ Seat Heater System)	ON/OFF	-	●	Not supported
Front seat heater RH (w/ Seat Heater System)	HI/LO	-	●	Not supported
Front seat heater LH (w/ Seat Heater System)	ON/OFF	-	●	Not supported
Front seat heater LH (w/ Seat Heater System)	HI/LO	-	●	Not supported
IGR relay		-	●	Not supported

System Diagram

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How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: Use these procedures to troubleshoot the CXPI communication system. *: Use the GTS. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT 2...

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