DTC B1373: Lost Communication with Wiper System LIN BUS [12/2019 - 11/2023]: Procedure

1. Disconnect the R4 rain sensor connector.
2. Clear the DTCs.

   Body Electrical > Main Body > Clear DTCs 

3. Turn the ignition switch to ON and wait for at least 10 seconds.
4. Read the DTCs.

   Body Electrical > Main Body > Trouble Codes 

   Result

   Result	Proceed to
   Only DTC B1279 is output	A
   DTC B1373 is output	B

Result: 

A 

REPLACE RAIN SENSOR. Refer to  REMOVAL [12/2019 - ] 

Result: 

B 

See step  2

1. Disconnect the H42 main body ECU (multiplex network body ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H42-3 (LIN3) - R4-3 (MPX)	Always	Below 1 Ω
   H42-3 (LIN3) or R4-3 (MPX) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR