Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000028DBF
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [11/2022 -           ]
Title: LIGHTING (INT): LIGHTING SYSTEM: Interior Light Circuit; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]

Interior Light Circuit

DESCRIPTION

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

  • Map Light Assembly
  • No. 1 Room Light Assembly

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.*

    for Gasoline Model: Click here 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

    for HV Model: Click here 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

    • *: w/ Smart Key System

HINT:

The DOME CUT relay supplies power to the interior lights. If all the lights that use power from the DOME CUT relay do not turn on, check the interior light auto cut circuit first.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; LIGHTING (INT): LIGHTING SYSTEM: Interior Light Auto Cut Circuit

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) 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

Illuminated Entry System

Turns on the lights that are controlled by the illuminated entry system*

OFF or ON

Perform the Active Test with the door linked switch of the map light assembly on and switch of the No. 1 room light assembly in the off (DOOR) position.
  • *: Refer to System Description for the lights that are controlled by the illuminated entry system.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; LIGHTING (INT): LIGHTING SYSTEM: SYSTEM DESCRIPTION

Body Electrical > Main Body > Active Test

Tester Display

Illuminated Entry System

OK:

All lights that are controlled by the illuminated entry system come on.

Result

Proceed to

OK

A

NG (Map light does not come on)

B

NG (No. 1 room light assembly does not come on)

C

NG (Map light and No. 1 room light assembly does not come on)

D
A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 - 03/2023]; LIGHTING (INT): LIGHTING SYSTEM: PROBLEM SYMPTOMS TABLE 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2023 -        ]; LIGHTING (INT): LIGHTING SYSTEM: PROBLEM SYMPTOMS TABLE

C

GO TO STEP 4

D

GO TO STEP 7

B

2.

INSPECT MAP LIGHT ASSEMBLY

(a) Inspect the map light assembly.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; LIGHTING (INT): PERSONAL LIGHT: INSPECTION

NG

REPLACE MAP LIGHT ASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Disconnect the 8D power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T6-4 (+B1) - 8D-11

Always

Below 1 Ω

T6-4 (+B1) or 8D-11 - Body ground

Always

10 kΩ or higher
OK

USE SIMULATION METHOD TO CHECK

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

INSPECT NO. 1 ROOM LIGHT ASSEMBLY

(a) Inspect the No. 1 room light assembly.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; LIGHTING (INT): ROOM LIGHT: INSPECTION

NG

REPLACE NO. 1 ROOM LIGHT ASSEMBLY

OK

5.

CHECK HARNESS AND CONNECTOR (NO. 1 ROOM LIGHT ASSEMBLY - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Disconnect the 8D power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T22-5 (B) - 8D-11

Always

Below 1 Ω

T22-5 (B) or 8D-11 - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

CHECK HARNESS AND CONNECTOR (NO. 1 ROOM LIGHT ASSEMBLY - MAP LIGHT ASSEMBLY AND BODY GROUND)

(a) Disconnect the T6 map light assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T22-1 (CTY) -T6-2 (RLMP)

Always

Below 1 Ω

T22-1 (CTY) or T6-2 (RLMP) - Body ground

Always

10 kΩ or higher

T22-5 (B) - Body ground

Always

Below 1 Ω
OK

USE SIMULATION METHOD TO CHECK

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

INSPECT MAP LIGHT ASSEMBLY

(a) Inspect the map light assembly.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; LIGHTING (INT): PERSONAL LIGHT: INSPECTION

NG

REPLACE MAP LIGHT ASSEMBLY

OK

8.

CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Disconnect the 8D power distribution box assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T6-4 (+B1) - 8D-11

Always

Below 1 Ω

T6-4 (+B1) or 8D-11 - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the I85 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

T6-3 (DOOR) - I85-5 (ILE)

Always

Below 1 Ω

T6-3 (DOOR) or I85-5 (ILE) - Body ground

Always

10 kΩ or higher
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR