Toyota Yaris: Wiper And Washer System / Terminals Of Ecu

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Vehicle Exterior / Wiper / Washer / Wiper And Washer System / Terminals Of Ecu

TERMINALS OF ECU

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

*1

Power Distribution Box Assembly

*2

Main Body ECU (Multiplex Network Body ECU)

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

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

MB-26 (BCEU) - Body ground

Auxiliary battery power supply

Ignition switch off

11 to 14 V

MB-27 (IGR) - Body ground

IG power source

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

MB-13 (GND1) - Body ground

Ground

Always

Below 1 Ω

(c) Install the main body ECU (multiplex network body ECU) to power distribution box assembly.

(d) Measure the voltage and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

4D-5 - Body ground

CXPI communication line

Ignition switch ON

Pulse generation

H4-6 (WPS) - Body ground

Wiper Relay operation signal

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

H5-11 (LIN4) - Body ground

LIN communication line

Ignition switch ON

Pulse generation

CHECK WINDSHIELD WIPER RELAY ASSEMBLY

(a) Disconnect the A50 and A49 windshield wiper relay assembly connectors.

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

A50-3 (E) - Body ground

Ground

Always

Below 1 Ω

A50-5 (EWS) - Body ground

Ground

Always

Below 1 Ω

A50-6 (IGWS) - Body ground

Washer circuit IG power source

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

A50-8 (+B) - Body ground

Ignition switch ON signal (Power source circuit)

Ignition switch ON

11 to 14 V

Less than approximately 60 seconds after ignition switch turned off

Approximately 60 seconds or more after ignition switch turned off

Below 1 V

A49-5 (ES) - Body ground

Ground

Always

Below 1 Ω

(c) Connect the A50 and A49 windshield wiper relay assembly connectors.

(d) Measure the voltage and resistance and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

A50-1 (+WR) - Body ground

Front washer operation signal

Ignition switch ON, front washer operating

11 to 14 V

A50-2 (+1) - Body ground

LO operation signal to windshield wiper motor assembly

Ignition switch ON, windshield wiper motor assembly operating in LO

11 to 14 V

A50-4 (+2) - Body ground

HI operation signal to windshield wiper motor assembly

Ignition switch ON, windshield wiper motor assembly operating in HI

11 to 14 V

A49-3 (2S) - Body ground

Windshield wiper motor assembly HI operation signal

Windshield wiper motor assembly stopped

4.5 to 5.5 V

Windshield wiper motor assembly operating in HI

Below 1 V

A49-4 (MPX1) - Body ground

CXPI communication line

Ignition switch ON

Pulse generation

Less than approximately 100 seconds after ignition switch turned off

Approximately 100 seconds or more after ignition switch turned off

11 to 14 V

A49-6 (+SM) - Body ground

Windshield wiper motor assembly position detection signal

Windshield wiper motor assembly in LO or HI operation

Below 1 V ←→ 11 to 14V

Windshield wiper motor assembly stopped

Below 1 V

CHECK RAIN SENSOR

(a) Disconnect the V9 rain sensor connector.

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

V9-2 (ES) - Body ground

Ground

Always

Below 1 Ω

V9-3 (MPX) - Body ground

LIN communication signal

Ignition switch ON

Pulse generation

V9-4 (SIG) - Body ground

IG power source circuit

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

    Problem Symptoms Table

    PROBLEM SYMPTOMS TABLE NOTICE: If the main body ECU (multiplex network body ECU) is replaced, refer to the Registration. Click here HINT: Use the table below to help determine the cause of problem symptoms...

    Dtc Check / Clear

    D..

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