Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GXJ4
Model Year Start: 2020 Model: GR Corolla Prod Date Range: [01/2019 - 09/2022]
Title: LIGHTING (INT): LIGHTING SYSTEM (for Gasoline Model): Back Door Courtesy Switch Circuit; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]

Back Door Courtesy Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) receives a back door open/closed signal from back door courtesy light switch (back door lock assembly).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.*

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  • *: w/ Smart Key System

PROCEDURE

1.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Back Door Courtesy SW

Back door courtesy switch signal

OFF or ON

OFF: Back door closed

ON: Back door open

-

Body Electrical > Main Body > Data List

Tester Display

Back Door Courtesy SW

OK:

Normal conditions listed above are displayed.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT BACK DOOR COURTESY LIGHT SWITCH (BACK DOOR LOCK ASSEMBLY)

(a) Remove the back door courtesy light switch (back door lock assembly).

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(b) Inspect the back door courtesy light switch (back door lock assembly).

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; LIGHTING (INT): BACK DOOR COURTESY SWITCH: INSPECTION

NG

REPLACE BACK DOOR COURTESY LIGHT SWITCH (BACK DOOR LOCK ASSEMBLY)

OK

3.

CHECK HARNESS AND CONNECTOR (BACK DOOR COURTESY LIGHT SWITCH (BACK DOOR LOCK ASSEMBLY) - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND BODY GROUND)

(a) Disconnect the 4A instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

V3-3 (D+) - 4A-34

Always

Below 1 Ω

V3-3 (D+) or 4A-34 - Body ground

Always

10 kΩ or higher

V3-2 (ACT-) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

*a

Component without harness connected

(Instrument Panel Junction Block Assembly)

-

-

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4A-34 - MB-4 (BCTY)

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL