Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GXK5
Model Year Start: 2020 Model: GR Corolla Prod Date Range: [01/2019 - 09/2022]
Title: LIGHTING (INT): LIGHTING SYSTEM (for Gasoline Model): Ambient Illumination Light Circuit; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]

Ambient Illumination Light Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the operation of the following lights:

  • Center Tray Illumination Light (Instrument Panel Light Assembly)
  • Cup Holder Light (Console Box Pocket Garnish)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.*

    Click here 2020 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2019]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION 2020 MY Corolla Corolla Hatchback GR Corolla [09/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION 2021 - 2022 MY Corolla Corolla Hatchback GR Corolla [04/2020 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

    • *: w/ Smart Key System

PROCEDURE

1.

PERFORM ACTIVE TEST 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 / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Main Body > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Fr Foot Light

  • Center tray illumination light (Instrument panel light assembly)
  • Cup holder light (Console box pocket garnish)

OFF or ON

Preconditions for using the Active Test to check dimmer controlled illumination:

  • Ignition switch ON
  • Shift lever is in any position other than P

Body Electrical > Main Body > Active Test

Tester Display

Fr Foot Light

Result

Proceed to

OK

A

NG (Center tray illumination light does not come on)

B

NG (Cup holder light does not come on)

C

NG (Center tray illumination light and cup holder light does not come on)

D

A

USE SIMULATION METHOD TO CHECK

C

GO TO STEP 6

D

GO TO STEP 10

B

2.

INSPECT CENTER TRAY ILLUMINATION LIGHT (INSTRUMENT PANEL LIGHT ASSEMBLY)

(a) Remove the center tray illumination light (instrument panel light assembly).

Click here 2020 - 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 11/2022]; LIGHTING (INT): INTERIOR ILLUMINATION LIGHT (for Instrument Panel): REMOVAL

(b) Inspect the center tray illumination light (instrument panel light assembly).

Click here 2020 - 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 11/2022]; LIGHTING (INT): INTERIOR ILLUMINATION LIGHT (for Instrument Panel): INSPECTION

NG

REPLACE CENTER TRAY ILLUMINATION LIGHT (INSTRUMENT PANEL LIGHT ASSEMBLY)

OK

3.

CHECK HARNESS AND CONNECTOR (CENTER TRAY ILLUMINATION LIGHT (INSTRUMENT PANEL LIGHT ASSEMBLY) - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the 4E and 4F instrument panel junction block assembly connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I29-2 (B) - 4F-25

Always

Below 1 Ω

I29-1 (E) - 4E-37

Always

Below 1 Ω

I29-2 (B) or 4F-25 - Body ground

Always

10 kΩ or higher

I29-1 (E) or 4E-37 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

*a

Component without harness connected

(Instrument Panel Junction Block Assembly)

-

-

(a) Disconnect the 4D 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

4D-1 - 4F-25

Always

Below 1 Ω

NG

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OK

5.

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.

Click here 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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4E-37 -MB-26 (FSPT)

Always

Below 1 Ω

OK

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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

6.

INSPECT CUP HOLDER LIGHT (CONSOLE BOX POCKET GARNISH)

(a) Remove the cup holder light (console box pocket garnish).

Click here 2020 - 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 11/2022]; LIGHTING (INT): INTERIOR ILLUMINATION LIGHT (for Console Box): REMOVAL

(b) Inspect the cup holder light (console box pocket garnish).

Click here 2020 - 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 11/2022]; LIGHTING (INT): INTERIOR ILLUMINATION LIGHT (for Console Box): INSPECTION

NG

REPLACE CUP HOLDER LIGHT (CONSOLE BOX POCKET GARNISH)

OK

7.

CHECK HARNESS AND CONNECTOR (CUP HOLDER LIGHT (CONSOLE BOX POCKET GARNISH) - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the 4E and 4F instrument panel junction block assembly connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I30-2 (B) - 4F-26

Always

Below 1 Ω

I30-1 (E) - 4E-36

Always

Below 1 Ω

I30-2 (B) or 4F-26 - Body ground

Always

10 kΩ or higher

I30-1 (E) or 4E-36 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

*a

Component without harness connected

(Instrument Panel Junction Block Assembly)

-

-

(a) Disconnect the 4D 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

4D-1 - 4F-26

Always

Below 1 Ω

NG

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OK

9.

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.

Click here 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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4E-36 -MB-26 (FSPT)

Always

Below 1 Ω

OK

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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

10.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

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

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

4D-1 - Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

11.

CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

*a

Component without harness connected

(Instrument Panel Junction Block Assembly)

-

-

(a) Disconnect the 4F 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

4D-1 - 4F-25

Always

Below 1 Ω

4D-1 - 4F-26

Always

Below 1 Ω

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

OK

12.

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.

Click here 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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4E-36 -MB-26 (FSPT)

Always

Below 1 Ω

4E-37 -MB-26 (FSPT)

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