Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001D07U
Model Year Start: 2019 Model: GR Corolla Prod Date Range: [06/2018 - 01/2019]
Title: LIGHTING (INT): LIGHTING SYSTEM (for Gasoline Model): Interior Light Circuit; 2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019]

Interior Light Circuit

DESCRIPTION

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

  • Map Light Assembly
  • Rear Room Light (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.

    Click here 2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

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 2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019]; LIGHTING (INT): LIGHTING SYSTEM (for Gasoline Model): Interior Light Auto Cut Circuit

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine 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

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 rear room light (No. 1 room light assembly) in the DOOR position.
  • *: Refer to System Description for the lights that are controlled by the illuminated entry system.

    Click here 2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019]; LIGHTING (INT): LIGHTING SYSTEM (for Gasoline Model): 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 (Rear room light does not come on)

C

NG (Map light and rear room light does not come on)

D
A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

C

GO TO STEP 4

D

GO TO STEP 5

B

2.

INSPECT MAP LIGHT ASSEMBLY

(a) Remove the map light assembly.

Click here 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; LIGHTING (INT): PERSONAL LIGHT: REMOVAL

(b) Inspect the map light assembly.

Click here 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; LIGHTING (INT): PERSONAL LIGHT: INSPECTION

NG

REPLACE MAP LIGHT ASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - 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

T6-10 (+B1) - 4F-10

Always

Below 1 Ω
OK

USE SIMULATION METHOD TO CHECK

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - MAP LIGHT ASSEMBLY)

(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

T6-10 (+B1) -T6-2 (RLMP)

Always

Below 1 Ω
OK

USE SIMULATION METHOD TO CHECK

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (INCLUDING BULB HOLDER OF THE NO. 1 ROOM LIGHT ASSEMBLY THAT ARE PART OF THE WIRE HARNESS)

5.

INSPECT MAP LIGHT ASSEMBLY

(a) Remove the map light assembly.

Click here 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; LIGHTING (INT): PERSONAL LIGHT: REMOVAL

(b) Inspect the map light assembly.

Click here 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; LIGHTING (INT): PERSONAL LIGHT: INSPECTION

NG

REPLACE MAP LIGHT ASSEMBLY

OK

6.

CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - 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

T6-10 (+B1) - 4F-10

Always

Below 1 Ω

T6-1 (DOOR) - 4F-29

Always

Below 1 Ω

T6-10 (+B1) or 4F-10 - Body ground

Always

10 kΩ or higher

T6-1 (DOOR) or 4F-29 - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

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 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; 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

4F-29 - MB-1 (ILE)

Always

Below 1 Ω
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY