Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001AYIG
Model Year Start: 2019 Model: Avalon HV Prod Date Range: [04/2018 - 08/2020]
Title: WIPER / WASHER: WIPER AND WASHER SYSTEM (for HV Model): B1373; Lost Communication with Wiper System LIN BUS; 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]

DTC

B1373

Lost Communication with Wiper System LIN BUS

DESCRIPTION

The main body ECU (multiplex network body ECU) and windshield wiper motor assembly communicate via LIN communication. The main body ECU (multiplex network body ECU) stores this DTC if communication becomes abnormal.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

DTC Output from

B1373

Lost Communication with Wiper System LIN BUS

Detection condition:

  • Auxiliary battery voltage is 9.5 V or more

Malfunction Status:

  • A malfunction in the communication or LIN communication line between the main body ECU (multiplex network body ECU) and components of the wiper system occurs

Malfunction Time:

  • 7 seconds or more 3 times consecutively
  • Windshield wiper motor assembly
  • Air conditioning thermister assembly
  • Main body ECU (multiplex network body ECU)
  • Harness or connector

○

Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

PROCEDURE

1.

CHECK AIR CONDITIONING THERMISTOR ASSEMBLY

(a) Disconnect the Q4 air conditioning thermister assembly connector.

(b) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

(c) Turn the power switch on (IG) and wait for at least 10 seconds.

(d) Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result

Proceed to

Only DTC B1279 is output

A

DTC B1373 is output

B
A

REPLACE AIR CONDITIONING THERMISTOR ASSEMBLY

B

2.

CHECK WINDSHIELD WIPER MOTOR ASSEMBLY

(a) Disconnect the A26 windshield wiper motor assembly connector.

(b) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

(c) Turn the power switch on (IG) and wait for at least 10 seconds.

(d) Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result

Proceed to

Only DTC B1245 is output

A

DTC B1373 is output

B
A

REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY

B

3.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - WINDSHIELD WIPER MOTOR ASSEMBLY AND RAIN SENSOR)

(a) Disconnect the G32 main body ECU (multiplex network body ECU) connector.

(b) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

(c) Turn the power switch on (IG) and wait for at least 10 seconds.

(d) Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result

Proceed to

DTC B1373 is not output

A

DTC B1373 is output

B
A

REPAIR OR REPLACE HARNESS OR CONNECTOR
B

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)