Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000028JQ9
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [11/2022 -           ]
Title: LIGHTING (EXT): LIGHTING SYSTEM: LO-beam Headlight does not Illuminate; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]

LO-beam Headlight does not Illuminate

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the low beam headlights.

WIRING DIAGRAM

for LED Type Turn Signal Light (for G16E-GTS)

for LED Type Turn Signal Light (for M20A-FKS, 2ZR-FXE)

for Bulb Type Turn Signal Light

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 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

  • First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CXPI communication malfunctions before troubleshooting this symptom.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; NETWORKING: CXPI COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

PROCEDURE

1.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

for LED Type Turn Signal Light

A

for Bulb Type Turn Signal Light

B
B

GO TO STEP 3

A

2.

PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Main Body > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Headlight Relay / Light Power Supply Relay

Low beam headlights

OFF or ON

-

Body Electrical > Main Body > Active Test

Tester Display

Headlight Relay / Light Power Supply Relay

OK:

Low beam headlights illuminate.

Result

Proceed to

OK

A

NG (LH side low beam headlight does not illuminate)

B

NG (RH side low beam headlight does not illuminate)

C
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 (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

B

REPLACE HEADLIGHT ASSEMBLY LH

C

REPLACE HEADLIGHT ASSEMBLY RH

3.

PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Main Body > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Headlight Relay / Light Power Supply Relay

Low beam headlights

OFF or ON

-

Body Electrical > Main Body > Active Test

Tester Display

Headlight Relay / Light Power Supply Relay

OK:

Low beam headlights illuminate.

Result

Proceed to

OK

A

NG (for LH Side)

B

NG (for RH Side)

C
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 (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

C

GO TO STEP 15

B

4.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

for TMC Made

A

for TMMC Made

B
B

GO TO STEP 8

A

5.

INSPECT HEADLIGHT UNIT ASSEMBLY LH (LO TERMINAL VOLTAGE)

(a) Disconnect the A130 headlight unit assembly LH connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A130-2 (LO) - Body ground

Light control switch in head position

11 to 14 V
NG

GO TO STEP 7

OK

6.

CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY LH - BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A130-5 (E) - Body ground

Always

Below 1 Ω
OK

REPLACE HEADLIGHT UNIT ASSEMBLY LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - HEADLIGHT UNIT ASSEMBLY LH)

(a) Remove the H-LP LH relay.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 (H-LP LH relay) - A130-2 (LO)

Always

Below 1 Ω

3 (H-LP LH relay) or A130-2 (LO) - Body ground

Always

10 kΩ or higher
OK

GO TO STEP 11

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.

INSPECT HEADLIGHT ASSEMBLY LH (LO TERMINAL VOLTAGE)

(a) Disconnect the A130 headlight assembly LH connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A130-2 (LO) - Body ground

Light control switch in head position

11 to 14 V
NG

GO TO STEP 10

OK

9.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A130-5 (E) - Body ground

Always

Below 1 Ω
OK

REPLACE HEADLIGHT ASSEMBLY LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.

CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - HEADLIGHT ASSEMBLY LH)

(a) Remove the H-LP LH relay.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 (H-LP LH relay) - A130-2 (LO)

Always

Below 1 Ω

3 (H-LP LH relay) or A130-2 (LO) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

11.

INSPECT H-LP LH RELAY

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 - 5

Voltage not applied between terminals 1 and 2

10 kΩ or higher

3 - 5

Voltage applied between terminals 1 and 2

Below 1 Ω
NG

REPLACE H-LP LH RELAY
OK

12.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - H-LP LH RELAY)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

2 (H-LP LH relay) - Body ground

Always

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

13.

CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Disconnect the 8F 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

1 (H-LP LH relay) - 8F-3

Always

Below 1 Ω

1 (H-LP LH relay) or 8F-3 - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

14.

INSPECT POWER DISTRIBUTION BOX ASSEMBLY

(a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; 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

8F-3 - MB-8 (HRLY)

Always

Below 1 Ω
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

15.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

for TMC Made

A

for TMMC Made

B
B

GO TO STEP 19

A

16.

INSPECT HEADLIGHT UNIT ASSEMBLY RH (LO TERMINAL VOLTAGE)

(a) Disconnect the A129 headlight unit assembly RH connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A129-2 (LO) - Body ground

Light control switch in head position

11 to 14 V
NG

GO TO STEP 18

OK

17.

CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY RH - BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A129-5 (E) - Body ground

Always

Below 1 Ω
OK

REPLACE HEADLIGHT UNIT ASSEMBLY RH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

18.

CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - HEADLIGHT UNIT ASSEMBLY RH)

(a) Remove the H-LP RH relay.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 (H-LP RH relay) - A129-2 (LO)

Always

Below 1 Ω

3 (H-LP RH relay) or A129-2 (LO) - Body ground

Always

10 kΩ or higher
OK

GO TO STEP 22

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

19.

INSPECT HEADLIGHT ASSEMBLY RH (LO TERMINAL VOLTAGE)

(a) Disconnect the A129 headlight assembly RH connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A129-2 (LO) - Body ground

Light control switch in head position

11 to 14 V
NG

GO TO STEP 21

OK

20.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A129-5 (E) - Body ground

Always

Below 1 Ω
OK

REPLACE HEADLIGHT ASSEMBLY RH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

21.

CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - HEADLIGHT ASSEMBLY RH)

(a) Remove the H-LP RH relay.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 (H-LP RH relay) - A129-2 (LO)

Always

Below 1 Ω

3 (H-LP RH relay) or A129-2 (LO) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

22.

INSPECT H-LP RH RELAY

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 - 5

Voltage not applied between terminals 1 and 2

10 kΩ or higher

3 - 5

Voltage applied between terminals 1 and 2

Below 1 Ω
NG

REPLACE H-LP RH RELAY
OK

23.

CHECK HARNESS AND CONNECTOR (POWER SOURCE - H-LP RH RELAY)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

2 (H-LP RH relay) - Body ground

Always

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

24.

CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - POWER DISTRIBUTION BOX ASSEMBLY)

(a) Disconnect the 8F 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

1 (H-LP RH relay) - 8F-4

Always

Below 1 Ω

1 (H-LP RH relay) or 8F-4 - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

25.

INSPECT POWER DISTRIBUTION BOX ASSEMBLY

(a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; 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

8F-4 - MB-9 (HRY2)

Always

Below 1 Ω
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY