Toyota Camry owners & service manuals

Toyota Camry (XV70): Lost Communication with Wiper System LIN BUS (B1373)

Toyota Camry Repair Manual XV70 (2018-2024) / Vehicle Exterior / Wiper / Washer / Wiper And Washer System / 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

 Detection condition:
  • 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
  • Main body ECU (multiplex network body ECU)
  • Harness or connector

○

Main Body

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

Click here

  • *: w/ Smart Key System

PROCEDURE

1.

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

(a) Disconnect the K51 main body ECU (multiplex network body ECU) connector.

(b) Disconnect the A31 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

K51-3 (LIN3) or A31-2 (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

K51-3 (LIN3) - Body ground

Ignition switch off

Below 1 V

Ignition switch ON

Pulse generation
OK

REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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