Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001COK1
Model Year Start: 2019 Model: GR Corolla Prod Date Range: [06/2018 - 01/2019]
Title: WIPER / WASHER: WIPER AND WASHER SYSTEM (for Gasoline Model): B2357; Lost Communication with Wiper Module; 2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019]

DTC

B2357

Lost Communication with Wiper Module

DESCRIPTION

The main body ECU (multiplex network body ECU) and windshield wiper relay communicate via CXPI 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

B2357

Lost Communication with Wiper Module

Detection condition:

  • Battery voltage is 9.5 V or more

Malfunction Status:

  • Communication malfunction between the main body ECU (multiplex network body ECU) and windshield wiper relay

Malfunction Time:

  • 10 seconds or more
  • Windshield wiper relay
  • Main body ECU (multiplex network body ECU)
  • Harness or connector
  • No. 1 integration relay

○

Main Body

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses of circuits related to this system before performing the following procedure.
  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

    Click here 2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

PROCEDURE

1.

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

(a) Disconnect the A56 windshield wiper relay connector.

(b) Disconnect the I84 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A56-4 (MPX1) - I84-5 (CXP1)

Always

Below 1 Ω

A56-4 (MPX1) or I84-5 (CXP1) - Body ground

Always

10 kΩ or 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 voltage and pulses according to the value(s) in the table below.

Standard Voltage and Pulse:

Tester Connection

Condition

Specified Condition

I84-5 (CXP1) - Body ground

Engine switch on (IG)

Pulse generation

Engine switch off

Below 1 V
NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

OK

3.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter following menus: Body Electrical / Main Body / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Main Body > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Wiper Power Relay

Function to operate the IG1 NO. 3 relay

OFF or ON

-

Body Electrical > Main Body > Active Test

Tester Display

Wiper Power Relay

OK:

IG1 NO. 3 relay operates normally.

NG

GO TO STEP 9

OK

4.

CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY - BODY GROUND)

(a) Disconnect the A55 windshield wiper relay connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A55-3 (E) - Body ground

Always

Below 1 Ω

A56-5 (ES) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - WINDSHIELD WIPER RELAY)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A55-8 (+B) - Body ground

Engine switch on (IG)

11 to 14 V

Less than approximately 60 seconds after engine switch turned off

11 to 14 V

Approximately 60 seconds or more after engine switch turned off

Below 1 V
OK

REPLACE WINDSHIELD WIPER RELAY

NG

6.

INSPECT NO. 1 INTEGRATION RELAY

(a) Remove the No. 1 integration relay.

Click here 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; POWER DISTRIBUTION: INTEGRATION RELAY: REMOVAL

(b) Inspect the No. 1 integration relay.

Click here 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; POWER DISTRIBUTION: INTEGRATION RELAY: INSPECTION

NG

REPLACE NO. 1 INTEGRATION RELAY

OK

7.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - NO. 1 INTEGRATION RELAY)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

1A-4 - Body ground

Always

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

8.

CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY - NO. 1 INTEGRATION RELAY)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A55-8 (+B) - 1A-3

Always

Below 1 Ω

A55-8 (+B) or 1A-3 - Body ground

Always

10 kΩ or higher
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.

INSPECT NO. 1 INTEGRATION RELAY

(a) Remove the No. 1 integration relay.

Click here 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; POWER DISTRIBUTION: INTEGRATION RELAY: REMOVAL

(b) Inspect the No. 1 integration relay.

Click here 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; POWER DISTRIBUTION: INTEGRATION RELAY: INSPECTION

NG

REPLACE NO. 1 INTEGRATION RELAY

OK

10.

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the I85 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1A-2 - I85-21 (WPS)

Always

Below 1 Ω

1A-2 or I85-21 (WPS) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

11.

CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1A-1 - Body ground

Always

Below 1 Ω
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR