Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000028JQ4
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [11/2022 -           ]
Title: LIGHTING (EXT): LIGHTING SYSTEM: Headlight Dimmer Switch Circuit; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]

Headlight Dimmer Switch Circuit

DESCRIPTION

The steering sensor receives the following switch information:

  • Light control switch in DRL OFF*1, off*2, tail, head, DRL*3 or AUTO*4 position
  • Dimmer switch in high, low or high flash (pass) position
  • Fog light switch in front or off position*5
    • *1: w/ DRL OFF Switch
    • *2: w/ OFF Switch
    • *3: w/o Automatic Light Control
    • *4: w/ Automatic Light Control
    • *5: w/ Front Fog Light

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

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

PROCEDURE

1.

READ VALUE USING GTS

(a) Read the Data List according to the display on the GTS.

Chassis > Steering Angle Sensor > Data List

Tester Display

Measurement Item

Normal Condition

Reference Value

Diagnostic Note

Light OFF Switch

Light control switch DRL OFF*1 or off*2 position signal

OFF or ON

OFF: Light control switch not in DRL OFF*1 or off*2 position

ON: Light control switch in DRL OFF*1 or off*2 position

*1, *2

Auto Light Switch

Light control switch AUTO*3 or DRL*4 position signal

OFF or ON

OFF: Light control switch not in AUTO*3 or DRL*4 position

ON: Light control switch in AUTO*3 or DRL*4 position

-

Head Light Switch (Tail)

Light control switch tail position signal

OFF or ON

OFF: Light control switch in neither tail nor head position

ON: Light control switch in tail or head position

-

Head Light Switch (Head)

Light control switch head position signal

OFF or ON

OFF: Light control switch not in head position

ON: Light control switch in head position

-

High Beam Main Switch

Dimmer switch high position signal

OFF or ON

OFF: Dimmer switch not in high position

ON: Dimmer switch in high position

-

Passing Light Switch

Dimmer switch high flash position (pass) signal

OFF or ON

OFF: Dimmer switch not in high flash position

ON: Dimmer switch in high flash position

-

Front Fog Light Switch

Front fog light switch signal

OFF or ON

OFF: Front fog light switch off

ON: Front fog light switch on

w/ Front Fog Light
  • *1: w/ DRL OFF Switch
  • *2: w/ OFF Switch
  • *3: w/ Automatic Light Control
  • *4: w/o Automatic Light Control

Chassis > Steering Angle Sensor > Data List

Tester Display

Light OFF Switch

Auto Light Switch

Head Light Switch (Tail)

Head Light Switch (Head)

High Beam Main Switch

Passing Light Switch

Front Fog Light Switch

OK:

Normal conditions listed above are displayed.

NG

GO TO STEP 5

OK

2.

READ VALUE USING GTS

(a) Read the Data List according to the display on the GTS.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Normal Condition

Reference Value

Diagnostic Note

Light Control Switch (HEAD)

Light control switch head position signal

OFF or ON

OFF: Light control switch not in head position

ON: Light control switch in head position

-

Body Electrical > Main Body > Data List

Tester Display

Light Control Switch (HEAD)

OK:

Normal conditions listed above are displayed.

OK

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

NG

3.

INSPECT STEERING SENSOR

*a

Component without harness connected

(Steering Sensor)

-

-

(a) Remove the steering sensor.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: STEERING ANGLE SENSOR: REMOVAL

(b) Measure the resistance according to the value(s) in the table below. (for M20A-FKS, for 2ZR-FXE)

Standard Resistance:

Tester Connection

Condition

Specified Condition

I211-7 (HEAD) - z17-4 (H)

Always

Below 1 Ω

(c) Measure the resistance according to the value(s) in the table below. (for G16E-GTS)

Standard Resistance:

Tester Connection

Condition

Specified Condition

I46-7 (HEAD) - z17-4 (H)

Always

Below 1 Ω
NG

REPLACE STEERING SENSOR

OK

4.

CHECK HARNESS AND CONNECTOR (STEERING SENSOR - 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. (for G16E-GTS)

Standard Resistance:

Tester Connection

Condition

Specified Condition

I46-7 (HEAD) - I85-26 (HEAD)

Always

Below 1 Ω

I46-7 (HEAD) or I85-26 (HEAD) - Body ground

Always

10 kΩ or higher

(c) Measure the resistance according to the value(s) in the table below. (for M20A-FKS, for 2ZR-FXE)

Standard Resistance:

Tester Connection

Condition

Specified Condition

I211-7 (HEAD) - I85-26 (HEAD)

Always

Below 1 Ω

I211-7 (HEAD) or I85-26 (HEAD) - Body ground

Always

10 kΩ or higher
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

INSPECT TURN SIGNAL SWITCH

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; LIGHTING (EXT): HEADLIGHT DIMMER SWITCH: INSPECTION

NG

REPLACE TURN SIGNAL SWITCH

OK

6.

INSPECT STEERING WHEEL SWITCH HOUSING

Click here 2020 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 -        ]; LIGHTING (EXT): SWITCH HOUSING: INSPECTION

OK

REPLACE STEERING SENSOR

NG

REPLACE STEERING WHEEL SWITCH HOUSING