Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Wiper Module Missing Message (B235787)

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Exterior / Wiper / Washer / Wiper And Washer System / Wiper Module Missing Message (B235787)

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.*1
    • for HEV Model:

      Click here

    • for Gasoline Model:

      Click here

    • *1: w/ Smart Key System

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY - POWER DISTRIBUTION BOX ASSEMBLY)

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

(b) Disconnect the 8E 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) - 8E-5

Always

Below 1 Ω

A56-4 (MPX1) or 8E-5 - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

2.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the MB 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

8E-5 - MB-22 (CXPI)

Always

Below 1 Ω

8E-5 or MB-22 (CXPI) - Body ground

Always

10 kΩ or higher
NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

OK

3.

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

*a

Front view of wire harness connector

(to Windshield Wiper Relay Assembly)

(a) Connect the 8E power distribution box assembly connector

(b) Check for voltage and pulses according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A56-4 (MPX1) - Body ground

Ignition switch ON

Pulse generation

A56-4 (MPX1) - Body ground

Ignition switch off

11 to 14 V
NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

OK

4.

PERFORM ACTIVE TEST USING GTS (WIPER POWER RELAY)

(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 10

OK

5.

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

(a) Disconnect the A55 and A56 windshield wiper relay assembly connectors.

(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

6.

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

*a

Front view of wire harness connector

(to Windshield Wiper Relay Assembly)

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

Standard Voltage:

Tester Connection

Switch 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

NG

7.

INSPECT WIPER RELAY

(a) Remove the WIPER relay.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 - 5

Auxiliary battery voltage not applied between terminals 1 and 2

10 kΩ or higher

Auxiliary battery voltage applied between terminals 1 and 2

Below 1 Ω

*a

Component without harness connected

(Windshield Wiper Relay)
NG

REPLACE WIPER RELAY
OK

8.

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

Switch Condition

Specified Condition

WIPER relay holder terminal 5 - Body ground

Ignition OFF

11 to 14 V

*1

No. 1 Engine Room Relay Block

*a

WIPER Relay Holder
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

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) - WIPER relay holder terminal 3

Always

Below 1 Ω

A55-8 (+B) - Body ground

Always

10 kΩ or higher
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.

INSPECT WIPER RELAY

(a) Remove the WIPER relay.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 - 5

Auxiliary battery voltage not applied between terminals 1 and 2

10 kΩ or higher

Auxiliary battery voltage applied between terminals 1 and 2

Below 1 Ω

*a

Component without harness connected

(Windshield Wiper Relay)
NG

REPLACE WIPER RELAY
OK

11.

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

WIPER relay holder terminal 2 - I85-6 (WPS)

Always

Below 1 Ω

WIPER relay holder terminal 2 or I85-6 (WPS) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

12.

CHECK HARNESS AND CONNECTOR (BODY GROUND - WIPER RELAY)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

WIPER relay holder terminal 1 - Body ground

Always

Below 1 Ω

*1

No. 1 Engine Room Relay Block

*a

WIPER Relay Holder
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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