Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GW2F
Model Year Start: 2020 Model: GR Corolla Prod Date Range: [01/2019 - 09/2022]
Title: WIPER / WASHER: WIPER AND WASHER SYSTEM (for Gasoline Model): TERMINALS OF ECU; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]

TERMINALS OF ECU

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

4F-3 - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

4B-1 - Body ground

B - Body ground

Battery power supply

Always

11 to 14 V

4D-1 - Body ground

B-R - Body ground

Battery power supply

Always

11 to 14 V

(c) Connect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

I84-5 (CXP1) - Body ground

BR - Body ground

CXPI communication line

Ignition switch ON

Pulse generation

I85-21 (WPS) - Body ground

R - Body ground

IG1 NO. 3 Relay operation signal

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

I86-1 (RWRY) - Body ground*

L - Body ground

Rear wiper motor assembly operation signal

Rear wiper motor assembly stopped

11 to 14 V

Rear wiper motor assembly operating

Below 1 V
  • *: w/ Rear Wiper System

CHECK WINDSHIELD WIPER RELAY

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

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A55-3 (E) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

A55-5 (EWS) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

A55-6 (IGWS) - Body ground

L - Body ground

Washer circuit IG power source

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

A55-8 (+B) - Body ground

B - Body ground

Engine switch on (IG) 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

A56-5 (ES) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Connect the A55 and A56 windshield wiper relay connectors.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A55-1 (+WR) - Body ground

L - Body ground*3

G - Body ground*4

Front washer operation signal

Ignition switch ON, front washer operating

11 to 14 V

A55-2 (+1) - Body ground

R - Body ground

LO operation signal to windshield wiper motor assembly

Ignition switch ON, windshield wiper motor assembly operating in LO

11 to 14 V

A55-4 (+2) - Body ground

W - Body ground

HI operation signal to windshield wiper motor assembly

Ignition switch ON, windshield wiper motor assembly operating in HI

11 to 14 V

A55-7 (-WR) - Body ground*1

W - Body ground

Rear washer operation signal

Ignition switch ON, rear washer operating

11 to 14 V

A55-7 (-WR) - Body ground*2

W - Body ground

Ground

Always

Below 1 Ω

A56-3 (2S) - Body ground

V - 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

A56-4 (MPX1) - Body ground

P - 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

A56-6 (+SM) - Body ground

G - 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
  • *1: w/ Rear Wiper System
  • *2: w/o Rear Wiper System
  • *3: for Hatchback
  • *4: for Sedan

CHECK COMBINATION METER ASSEMBLY (w/ Level Warning Switch)

Click here 2020 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 03/2019]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (for Gasoline Model): TERMINALS OF ECU 2020 MY Corolla Corolla Hatchback GR Corolla [03/2019 - 04/2020]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (for Gasoline Model): TERMINALS OF ECU 2021 MY Corolla Corolla Hatchback GR Corolla [04/2020 - 06/2021]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (for Gasoline Model): TERMINALS OF ECU 2022 MY Corolla Corolla Hatchback GR Corolla [06/2021 - 09/2022]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (for Gasoline Model): TERMINALS OF ECU