Toyota Yaris: Wiper And Washer System / Wiper Module Missing Message (B235787)

Toyota Yaris XP210 (2020-2024) Reapir and 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
  • Auxiliary battery voltage is 9.5 V or more
  • Communication malfunction between the main body ECU (multiplex network body ECU) and windshield wiper relay assembly
  • 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.
  • If the main body ECU (multiplex network body ECU) is replaced, refer to the Registration.

    Click here

HINT:

The wiper and washer system uses the CXPI communication system. First, confirm that there is no malfunction in the CXPI communication system.

PROCEDURE

1.

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

(a) Disconnect the A49 windshield wiper relay assembly connector.

(b) Disconnect the 4D power distribution box assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A49-4 (MPX1) - 4D-5

Always

Below 1 Ω

A49-4 (MPX1) or 4D-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 4D power distribution box assembly connector.

(b) Disconnect the MB 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

4D-5 - MB-22 (CXPI)

Always

Below 1 Ω

4D-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) Connect the 4D 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

A49-4 (MPX1) - Body ground

Ignition switch ON

Pulse generation

A49-4 (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 IG1 wiper relay

OFF or ON

-
Body Electrical > Main Body > Active Test

Tester Display

Wiper Power Relay

OK:

IG1 Wiper relay operates normally.

NG

GO TO STEP 10

OK

5.

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

*a

Front view of wire harness connector

(to Windshield Wiper Relay Assembly)

-

-

(a) Disconnect the A50 and A49 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

A50-3 (E) - Body ground

Always

Below 1 Ω

A49-5 (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

Condition

Specified Condition

A50-8 (+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

Click here

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 3 - 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

A50-8 (+B) - WIPER relay holder terminal 5

Always

Below 1 Ω

A50-8 (+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

Click here

NG

REPLACE WIPER RELAY
OK

11.

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

(a) Disconnect the H4 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 1 - H4-6 (WPS)

Always

Below 1 Ω

WIPER relay holder terminal 1 or H4-6 (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 2 - 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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