Toyota Yaris: Wiper And Washer System / Humidity/Rain Sensor Missing Message (B127987)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Vehicle Exterior / Wiper / Washer / Wiper And Washer System / Humidity/Rain Sensor Missing Message (B127987)

DESCRIPTION

The main body ECU (multiplex network body ECU) and rain sensor communicate via LIN 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

B127987

Humidity/Rain Sensor Missing Message

  • Auxiliary battery voltage is 9.5 V or more
  • Communication malfunction with rain sensor
  • 10 seconds or more
  • Rain sensor
  • Harness or connector
  • Main body ECU (multiplex network body ECU)

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.

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PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - RAIN SENSOR)

(a) Disconnect the H5 main body ECU (multiplex network body ECU) connector.

(b) Disconnect the V9 rain sensor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H5-11 (LIN4) - V9-3 (MPX)

Always

Below 1 Ω

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:

Tester Connection

Switch Condition

Specified Condition

H5-11 (LIN4) - Body ground

Ignition switch ON

Pulse generation

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

OK

3.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - RAIN SENSOR)

*a

Front view of wire harness connector

(to Rain Sensor)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

V9-4 (SIG) - Body ground

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (RAIN SENSOR - BODY GROUND)

*a

Front view of wire harness connector

(to Rain Sensor)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

V9-2 (ES) - Body ground

Always

Below 1 Ω

OK

REPLACE RAIN SENSOR

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Diagnostic Trouble Code Chart

    D..

    Rain Sensor Malfunction (B1400)

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    Categories

    Break-In Period

    No special break-in is necessary, but a few precautions in the first 600 miles (1,000 km) may add to the performance, economy, and life of the vehicle.

    Do not race the engine. Do not maintain one constant speed, either slow or fast, for a long period of time. Do not drive constantly at full-throttle or high engine rpm for extended periods of time. Avoid unnecessary hard stops. Avoid full-throttle starts.

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