Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Control Module Communication Bus OFF (U0073,U0126,U0142,U0155,U0182)

DESCRIPTION

These DTCs are stored if a CAN communication malfunction occurs between the headlight ECU sub-assembly RH and other ECUs.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from
U0073	Control Module Communication Bus OFF	The headlight ECU sub-assembly RH does not send/receive data.	CAN communication system	Headlight ECU sub-assembly RH
U0126	Lost Communication with Steering Angle Sensor Module	The headlight ECU sub-assembly RH does not receive data from the steering sensor for approximately 10 seconds or more.	CAN communication system Steering sensor	Headlight ECU sub-assembly RH
U0142	Lost Communication with Body Control Module "B"	The headlight ECU sub-assembly RH does not receive data from the main body ECU (multiplex network body ECU) for approximately 10 seconds or more.	CAN communication system Main body ECU (multiplex network body ECU)	Headlight ECU sub-assembly RH
U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module	The headlight ECU sub-assembly RH does not receive data from the combination meter assembly for approximately 30 seconds or more.	CAN communication system Combination meter assembly	Headlight ECU sub-assembly RH
U0182	Lost Communication With Lighting Control Module Front	The headlight ECU sub-assembly RH does not receive data from the headlight ECU sub-assembly LH for approximately 10 seconds or more.	CAN communication system Headlight ECU sub-assembly LH	Headlight ECU sub-assembly RH

PROCEDURE

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / HL AutoLeveling (Sub) / Trouble Codes.

(e) Clear the DTCs.

Body Electrical > HL AutoLeveling (Sub) > Clear DTCs

2.	CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / HL AutoLeveling (Sub) / Trouble Codes.

(f) Check for DTCs.

Body Electrical > HL AutoLeveling (Sub) > Trouble Codes

OK:

DTCs are not output.

USE SIMULATION METHOD TO CHECK

GO TO CAN COMMUNICATION SYSTEM

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Automatic Transaxle System: How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: The ECM is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there are no malfunctions in the CAN communication system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT 2. CUSTOMER PROBLEM ...

Toyota Avalon (XX50) 2019-2022 Owners Manual