Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM10000000263T5
Model Year Start: 2023 Model: Corolla Prod Date Range: [09/2022 -           ]
Title: WIPER / WASHER: WIPER AND WASHER SYSTEM (for HV Model): B235787; Wiper Module Missing Message; 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]

DTC

B235787

Wiper Module Missing Message

DESCRIPTION

The main body ECU (multiplex network body ECU) and windshield wiper relay assembly 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

B235787

Wiper Module Missing Message

Detection condition:

  • Auxiliary 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 assembly

Malfunction Time:

  • 10 seconds or more
  • Windshield wiper relay assembly
  • Main body ECU (multiplex network body ECU)
  • Harness or connector
  • WIPER relay
  • Power distribution box assembly

○

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 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

PROCEDURE

1.

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

(a) Disconnect the A56 windshield wiper relay assembly connector.

(b) Disconnect the 8F power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A56-4 (MPX1) - 8F-9

Always

Below 1 Ω

A56-4 (MPX1) or 8F-9 - 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) Check for voltage and pulses according to the value(s) in the table below.

Standard Voltage and Pulse:

Tester Connection

Condition

Specified Condition

8F-9 - Body ground

Ignition switch ON

Pulse generation

Ignition switch off

Below 1 V

*a

Component without harness connected

(Power Distribution Box Assembly)
NG

GO TO STEP 12

OK

3.

PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Main Body > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Wiper Power Relay

Function to operate the WIPER relay

OFF or ON

-

Body Electrical > Main Body > Active Test

Tester Display

Wiper Power Relay

OK:

WIPER relay operates normally.

NG

GO TO STEP 9

OK

4.

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

(a) Disconnect the A55 windshield wiper relay assembly 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 ASSEMBLY)

(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

Ignition switch ON

11 to 14 V

Less than approximately 60 seconds after ignition switch turned off

11 to 14 V

Approximately 60 seconds or more after ignition switch turned off

Below 1 V
OK

REPLACE WINDSHIELD WIPER RELAY ASSEMBLY 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; WIPER / WASHER: WIPER ECU: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; WIPER / WASHER: WIPER ECU: REMOVAL

NG

6.

INSPECT WIPER RELAY

(a) Inspect the WIPER relay.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; WIPER / WASHER: RELAY: ON-VEHICLE INSPECTION

NG

REPLACE WIPER RELAY
OK

7.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - WIPER RELAY)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

5 (WIPER relay) - Body ground

Ignition switch off

11 to 14 V

*1

No. 1 Engine Room Relay Block Assembly
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

8.

CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY - WIPER RELAY)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A55-8 (+B) - 3 (WIPER relay)

Always

Below 1 Ω

A55-8 (+B) or 3 (WIPER relay) - Body ground

Always

10 kΩ or higher
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.

INSPECT WIPER RELAY

(a) Inspect the WIPER relay.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; WIPER / WASHER: RELAY: ON-VEHICLE INSPECTION

NG

REPLACE WIPER RELAY
OK

10.

CHECK HARNESS AND CONNECTOR (WIPER 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

1 (WIPER relay) - I85-6 (WPS)

Always

Below 1 Ω

1 (WIPER relay) or I85-6 (WPS) - Body ground

Always

10 kΩ or higher

*1

NO. 1 ENGINE ROOM RELAY BLOCK ASSEMBLY
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

11.

CHECK HARNESS AND CONNECTOR (WIPER RELAY - BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2 (WIPER relay) - Body ground

Always

Below 1 Ω
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.

CHECK POWER DISTRIBUTION BOX ASSEMBLY

(a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

8F-9 - MB-22 (CXP1)

Always

Below 1 Ω

8F-9 or MB-22 (CXP1) - Body ground

Always

10 kΩ or higher

*a

Component without harness connected

(Power Distribution Box Assembly)
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL