RM35X0E _59 Vehicle Exterior _079320 WIPER / WASHER _0385301 WIPER AND WASHER SYSTEM C

WIPER / WASHER  WIPER AND WASHER SYSTEM  B1373  Lost Communication with Wiper System LIN BUS  


DESCRIPTION

The main body ECU (multiplex network body ECU) communicates with the rain sensor via LIN communication. If a malfunction occurs in the LIN communication line and a communication error occurs, this DTC is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory DTC Output from
B1373 Lost Communication with Wiper System LIN BUS
DTC Detection Condition:

Ignition switch ON (IG+ voltage 9.5 V or higher)


Malfunction Status:

Wire-type LIN communication error detected


Malfunction Duration:

7 seconds or more


·

Rain sensor

·

Harness or connector

·

Main body ECU (multiplex network body ECU)


○ Main Body

WIRING DIAGRAM

E404590E04
1.604,1.469 2.063,1.667 0.458,0.198 10 false a8 1.594,1.625 2.438,1.833 0.844,0.208 10 false Rain Sensor 4.26,1.521 4.719,1.719 0.458,0.198 10 false N18 4.26,1.708 5.906,2.146 1.646,0.438 10 false Main Body ECU (Multiplex Network Body ECU) 2.208,0.875 2.667,1.073 0.458,0.198 10 false MPX 2.656,0.708 2.813,0.906 0.156,0.198 10 false 3 4.365,0.708 4.521,0.906 0.156,0.198 10 false 3 4.604,0.885 5.219,1.083 0.615,0.198 10 false LIN3 0.542,2.427 2.188,2.635 1.646,0.208 10 false : LIN Communication Line

CAUTION / NOTICE / HINT

NOTICE:

If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.


PROCEDURE

1.CHECK FOR DTC
a.

Clear the DTCs.

Click hereVehicle Exterior>WIPER / WASHER>WIPER AND WASHER SYSTEM>DTC CHECK / CLEAR

Body Electrical > Main Body > Clear DTCs
50002 123

b.

Turn the ignition switch to ON and wait for at least 10 seconds.


c.

Check for DTCs.

Click hereVehicle Exterior>WIPER / WASHER>WIPER AND WASHER SYSTEM>DTC CHECK / CLEAR

Body Electrical > Main Body > Trouble Codes
50001 123
OK:

DTC B1373 is not output



Result:
Proceed to
OK
NG



OK

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


NG

2.CHECK RAIN SENSOR
2.CHECK RAIN SENSOR
a.

Disconnect the a8 rain sensor connector.


b.

Clear the DTCs.

Click hereVehicle Exterior>WIPER / WASHER>WIPER AND WASHER SYSTEM>DTC CHECK / CLEAR

Body Electrical > Main Body > Clear DTCs
50002 123

c.

Turn the ignition switch to ON and wait for at least 10 seconds.


d.

Check for DTCs.

Click hereVehicle Exterior>WIPER / WASHER>WIPER AND WASHER SYSTEM>DTC CHECK / CLEAR

Body Electrical > Main Body > Trouble Codes
50001 123

Result:
Result Proceed to
DTC B1373 is not output, but DTC B1279 is output A
DTC B1373 is output B



A

REPLACE RAIN SENSOR

Click hereVehicle Exterior>WIPER / WASHER>RAIN SENSOR>REMOVAL


B

3.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - RAIN SENSOR AND BODY GROUND)
3.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - RAIN SENSOR AND BODY GROUND)
a.

Disconnect the N18 main body ECU (multiplex network body ECU) connector.


b.

Disconnect the a8 rain sensor connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
N18-3 (LIN3) - a8-3 (MPX) Always Below 1 Ω
N18-3 (LIN3) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

for LHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for LHD)>REMOVAL

for RHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for RHD)>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR