Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001GXK1
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 09/2022]
Title: LIGHTING (INT): LIGHTING SYSTEM (for HV Model): Door Illumination Circuit; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

Door Illumination Circuit

DESCRIPTION

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

  • Door Ambient Illumination Light LH (Front Door Trim Board Sub-assembly LH)
  • Door Ambient Illumination Light RH (Front Door Trim Board Sub-assembly RH)

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

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(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

Interior Illumination Light1
  • Door ambient illumination light LH (Front door trim board sub-assembly LH)
  • Door ambient illumination light RH (Front door trim board sub-assembly RH)

OFF or ON

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

  • Power switch on (IG)
  • Shift lever is in any position other than P

Body Electrical > Main Body > Active Test

Tester Display

Interior Illumination Light1

OK:

Door ambient illumination lights come on.

Result

Proceed to

OK

A

NG (Door ambient illumination light LH does not come on)

B

NG (Door ambient illumination light RH does not come on)

C

NG (All door ambient illumination light do not come on)

D
A

USE SIMULATION METHOD TO CHECK

C

GO TO STEP 5

D

GO TO STEP 8

B

2.

INSPECT DOOR AMBIENT ILLUMINATION LIGHT LH (FRONT DOOR TRIM BOARD SUB-ASSEMBLY LH)

(a) Remove the door ambient illumination light LH (front door trim board sub-assembly LH).

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

(b) Inspect the door ambient illumination light LH (front door trim board sub-assembly LH).

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

NG

REPLACE DOOR AMBIENT ILLUMINATION LIGHT LH (FRONT DOOR TRIM BOARD SUB-ASSEMBLY LH)

OK

3.

CHECK HARNESS AND CONNECTOR (DOOR AMBIENT ILLUMINATION LIGHT LH (FRONT DOOR TRIM BOARD SUB-ASSEMBLY LH) - 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

L5-2 (+) - 4F-27

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (DOOR AMBIENT ILLUMINATION LIGHT LH (FRONT DOOR TRIM BOARD SUB-ASSEMBLY LH) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the I84 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

L5-1 (-) - I84-20 (LED1)

Always

Below 1 Ω
OK

USE SIMULATION METHOD TO CHECK

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

INSPECT DOOR AMBIENT ILLUMINATION LIGHT RH (FRONT DOOR TRIM BOARD SUB-ASSEMBLY RH)

(a) Remove the door ambient illumination light RH (front door trim board sub-assembly RH).

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

(b) Inspect the door ambient illumination light RH (front door trim board sub-assembly RH).

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

NG

REPLACE DOOR AMBIENT ILLUMINATION LIGHT RH (FRONT DOOR TRIM BOARD SUB-ASSEMBLY RH)

OK

6.

CHECK HARNESS AND CONNECTOR (DOOR AMBIENT ILLUMINATION LIGHT RH (FRONT DOOR TRIM BOARD SUB-ASSEMBLY RH) - 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

K6-2 (+) - 4F-24

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

CHECK HARNESS AND CONNECTOR (DOOR AMBIENT ILLUMINATION LIGHT RH (FRONT DOOR TRIM BOARD SUB-ASSEMBLY RH) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the I84 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K6-1 (-) - I84-20 (LED1)

Always

Below 1 Ω
OK

USE SIMULATION METHOD TO CHECK

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.

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

Power switch off

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

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

4F-24 - 4D-1

Always

Below 1 Ω

4F-27 - 4D-1

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

10.

CHECK HARNESS AND CONNECTOR (DOOR AMBIENT ILLUMINATION LIGHT (FRONT DOOR TRIM BOARD SUB-ASSEMBLY) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the L5 door ambient illumination light LH (front door trim board sub-assembly LH) connector.

(b) Disconnect the K6 door ambient illumination light RH (front door trim board sub-assembly RH) connector.

(c) Disconnect the I84 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

L5-1 (-) - I84-20 (LED1)

Always

Below 1 Ω

K6-1 (-) - I84-20 (LED1)

Always

Below 1 Ω

L5-1 (-), K6-1 (-) or I84-20 (LED1) - Body ground

Always

10 kΩ or higher
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

REPAIR OR REPLACE HARNESS OR CONNECTOR