WIPER / WASHER: WIPER AND WASHER SYSTEM (for Gasoline Model): B235787; Wiper Module Missing Message; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [09/2022

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM10000000263TS
Model Year Start: 2023	Model: GR Corolla	Prod Date Range: [09/2022 - ]
Title: WIPER / WASHER: WIPER AND WASHER SYSTEM (for Gasoline Model): B235787; Wiper Module Missing Message; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [09/2022 - ]

DTC

B235787

Wiper Module Missing Message

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
B235787	Wiper Module Missing Message	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 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
- *: w/ Smart Key System

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK VEHICLE TYPE

(a) Check vehicle type.

Result	Proceed to
except G16E-GTS	A
for G16E-GTS	B

GO TO STEP 13

3.	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
8F-9 - Body ground	Ignition switch off	Below 1 V

*a	Component without harness connected (Power Distribution Box Assembly)

GO TO STEP 23

4.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

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

(e) 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.

GO TO STEP 10

5.	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

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	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

REPLACE WINDSHIELD WIPER RELAY ASSEMBLY

7.	INSPECT WIPER RELAY

(a) Inspect the WIPER relay.

Click here

REPLACE WIPER RELAY

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	Condition	Specified Condition
5 (WIPER relay) - Body ground	Ignition switch off	11 to 14 V

*1	No. 1 Engine Room Relay Block Assembly

REPAIR OR REPLACE HARNESS OR CONNECTOR

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) - 3 (WIPER relay)	Always	Below 1 Ω
A55-8 (+B) or 3 (WIPER relay) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	INSPECT WIPER RELAY

(a) Inspect the WIPER relay.

Click here

REPLACE WIPER RELAY

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:

except Sedan:

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

Standard Resistance:

for Sedan:

Tester Connection	Condition	Specified Condition
2 (WIPER relay) - I85-6 (WPS)	Always	Below 1 Ω
2 (WIPER relay) or I85-6 (WPS) - Body ground	Always	10 kΩ or higher

*1	NO. 1 ENGINE ROOM RELAY BLOCK ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.	CHECK HARNESS AND CONNECTOR (WIPER RELAY - BODY GROUND)

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

Standard Resistance:

except Sedan:

Tester Connection	Condition	Specified Condition
2 (WIPER relay) - Body ground	Always	Below 1 Ω

Standard Resistance:

for Sedan:

Tester Connection	Condition	Specified Condition
1 (WIPER relay) - Body ground	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.	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
8F-9 - Body ground	Ignition switch off	Below 1 V

*a	Component without harness connected (Power Distribution Box Assembly)

GO TO STEP 23

14.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to 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.

GO TO STEP 20

15.	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

REPAIR OR REPLACE HARNESS OR CONNECTOR

16.	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

REPLACE WINDSHIELD WIPER RELAY ASSEMBLY

17.	INSPECT NO. 1 INTEGRATION RELAY

(a) Remove the No. 1 integration relay.

Click here

(b) Inspect the No. 1 integration relay.

Click here

REPLACE NO. 1 INTEGRATION RELAY

18.	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
9A-4 - Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

19.	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) - 9A-3	Always	Below 1 Ω
A55-8 (+B) or 9A-3 - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

20.	INSPECT NO. 1 INTEGRATION RELAY

(a) Remove the No. 1 integration relay.

Click here

(b) Inspect the No. 1 integration relay.

Click here

REPLACE NO. 1 INTEGRATION RELAY

21.	CHECK HARNESS AND CONNECTOR (NO. 1 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
9A-2 - I85-6 (WPS)	Always	Below 1 Ω
9A-2 or I85-6 (WPS) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

22.	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
9A-1 - Body ground	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

23.	CHECK POWER DISTRIBUTION BOX ASSEMBLY

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

Click here

(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)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

DESCRIPTION

Detection condition:

Malfunction Status:

Malfunction Time:

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

Body Electrical > Main Body > Active Test

Body Electrical > Main Body > Active Test

except Sedan:

for Sedan:

except Sedan:

for Sedan:

Body Electrical > Main Body > Active Test

Body Electrical > Main Body > Active Test