Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Lost Communication with Wiper System LIN BUS (B1373)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Exterior / Wiper / Washer / Wiper And Washer System(for Gasoline Model) / Lost Communication with Wiper System LIN BUS (B1373)

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
  • Battery voltage is 9.5 V or more
  • 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
  • 7 seconds or more 3 times consecutively
  • Windshield wiper motor 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

PROCEDURE

1.

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

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

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

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

G32-3 (LIN3) or A26-2 (LIN) - Body ground

Always

10 kΩ Higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

2.

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

*a

Component without harness connected

(Main Body ECU (Multiplex Network Body ECU)

(a) Check for pulses according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

G32-3 (LIN3) - Body ground

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation
OK

REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Wiper Switch Signal Mismatch between LIN and Line (B1372)

    Check For Intermittent Problems

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