Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000028HAI
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [11/2022 -           ]
Title: METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (except 12.3 Inch Display): B150718; Turn Signal Light Circuit Current Below Threshold; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]

DTC

B150718

Turn Signal Light Circuit Current Below Threshold

DESCRIPTION

This DTC is stored when the combination meter assembly detects an open in a front turn signal light circuit or rear turn signal light circuit.

HINT:

  • If there is an open in a front turn signal light circuit or rear turn signal light circuit, the turn signal lights on the side with the open circuit will blink faster than usual.
  • If there is an open in a side turn signal light circuit, DTC B150718 will not be stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

Priority

B150718

Turn Signal Light Circuit Current Below Threshold

Diagnosis Condition:

  • Auxiliary battery voltage is 10 V or more

Malfunction Status:

  • Open in front turn signal light circuit
  • Open in rear turn signal light circuit
  • Headlight unit assembly
  • Rear Combination Light Assembly
  • Rear turn signal light LED
  • Harness or connector
  • Combination meter assembly

Combination Meter

A

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing any of the following ECUs, always replace it with a new one. If any of the following ECUs is replaced with one which was installed to another vehicle, the information stored in it will not match the information from the vehicle and a DTC may be stored.
  • When replacing the headlight ECU sub-assembly LH, always replace it with a new one. If a headlight ECU sub-assembly LH which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
  • When replacing the combination meter assembly, update the ECU security key.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; SETUP: WHEN REPLACING OR REMOVING/INSTALLING PARTS: UPDATE ECU SECURITY KEY

  • Inspect the turn signal light bulbs before performing the following procedure.

PROCEDURE

1.

CHECK SYMPTOMS

(a) Operate the turn signal switch and check the problem symptoms.

Result

Proceed to

Front turn signal light (LH side) does not blink

A

Rear turn signal light (LH side) does not blink

B

Front turn signal light (RH side) does not blink

C

Rear turn signal light (RH side) does not blink

D
B

GO TO STEP 4

C

GO TO STEP 6

D

GO TO STEP 8

A

2.

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

(a) Disconnect the A131*1, A134*2 headlight assembly LH connector.

(b) Disconnect the I5 combination meter assembly connector.

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

Standard Resistance (LED Type Front Turn Signal Light):

Tester Connection

Condition

Specified Condition

A131-6 (B) - I5-5 (LL)

Always

Below 1 Ω

A131-3 (E) - Body ground

Always

Below 1 Ω

Standard Resistance (Bulb Type Front Turn Signal Light):

Tester Connection

Condition

Specified Condition

A134-1 (B) - I5-5 (LL)

Always

Below 1 Ω

A134-2 (E) - Body ground*3

Always

Below 1 Ω

A134-3 (E) - Body ground*4

Always

Below 1 Ω
  • *1: for LED Type Front Turn Signal Light
  • *2: for Bulb Type Front Turn Signal Light
  • *3: for TMC Made Sedan
  • *4: for TMMMS Made
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

CHECK TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY LH)

(a) Remove the headlight assembly LH.

HINT:

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: REMOVAL

(b) Remove the Headlight Assembly RH.

HINT:

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: REMOVAL

(c) Interchange the Headlight Assembly LH with RH and connect the connectors.

(d) Check the front turn signal light (LH side) operates normally.

Result

Proceed to

Problem symptoms do not change

(Front turn signal light (LH side) does not blink)

A

Front turn signal light (LH side) operates normally

B
A

REPLACE COMBINATION METER ASSEMBLY

B

REPLACE HEADLIGHT ASSEMBLY LH

4.

CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND)

(a) Disconnect the O104*1, O43*2 rear combination light assembly LH connector.

(b) Disconnect the I5 combination meter assembly connector.

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

Standard Resistance (for Sedan):

Tester Connection

Condition

Specified Condition

O104-3 (B) - I5-22 (TRNL)

Always

Below 1 Ω

O104-4 (E) - Body ground

Always

Below 1 Ω

Standard Resistance (for Hatchback):

Tester Connection

Condition

Specified Condition

O43-4 (B) - I5-22 (TRNL)

Always

Below 1 Ω

O43-3 (E) - Body ground

Always

Below 1 Ω
  • *1: for Sedan
  • *2: for Hatchback
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

INSPECT REAR COMBINATION LIGHT ASSEMBLY LH

for Hatchback: Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; LIGHTING (EXT): REAR COMBINATION LIGHT ASSEMBLY (for Hatchback): INSPECTION

for Sedan: Click here 2020 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 -        ]; LIGHTING (EXT): REAR COMBINATION LIGHT ASSEMBLY (for Sedan): INSPECTION

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPLACE REAR COMBINATION LIGHT ASSEMBLY LH

for Hatchback: Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; LIGHTING (EXT): REAR COMBINATION LIGHT ASSEMBLY (for Hatchback): REMOVAL

for Sedan: Click here 2020 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 -        ]; LIGHTING (EXT): REAR COMBINATION LIGHT ASSEMBLY (for Sedan): REMOVAL

6.

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

(a) Disconnect the A133*1, A132*2 headlight assembly RH connector.

(b) Disconnect the I5 combination meter assembly connector.

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

Standard Resistance (for LED Type Front Turn Signal Light):

Tester Connection

Condition

Specified Condition

A133-6 (B) - I5-6 (LR)

Always

Below 1 Ω

A133-3 (E) - Body ground

Always

Below 1 Ω

Standard Resistance (for Bulb Type Front Turn Signal Light):

Tester Connection

Condition

Specified Condition

A132-1 (B) - I5-6 (LR)

Always

Below 1 Ω

A132-2 (E) - Body ground*3

Always

Below 1 Ω

A132-3 (E) - Body ground*4

Always

Below 1 Ω
  • *1: for LED Type Front Turn Signal Light
  • *2: for Bulb Type Front Turn Signal Light
  • *3: for TMC Made Sedan
  • *4: for TMMMS Made
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

CHECK TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY RH)

(a) Remove the headlight assembly RH.

HINT:

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: REMOVAL

(b) Remove the Headlight Assembly LH.

HINT:

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: REMOVAL

(c) Interchange the Headlight Assembly RH with LH and connect the connectors.

(d) Check the front turn signal light (RH side) operates normally.

Result

Proceed to

Problem symptoms do not change

(Front turn signal light (RH side) does not blink)

A

Front turn signal light (RH side) operates normally

B
A

REPLACE COMBINATION METER ASSEMBLY

B

REPLACE HEADLIGHT ASSEMBLY RH

8.

CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND)

(a) Disconnect the O103*1, O42*2 rear combination light assembly RH connector.

(b) Disconnect the I5 combination meter assembly connector.

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

Standard Resistance (for Sedan):

Tester Connection

Condition

Specified Condition

O103-3 (B) - I5-21 (TRNR)

Always

Below 1 Ω

O103-4 (E) - Body ground

Always

Below 1 Ω

Standard Resistance (for Hatchback):

Tester Connection

Condition

Specified Condition

O42-4 (B) - I5-21 (TRNR)

Always

Below 1 Ω

O42-3 (E) - Body ground

Always

Below 1 Ω
  • *1: for Sedan
  • *2: for Hatchback
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

INSPECT REAR COMBINATION LIGHT ASSEMBLY RH

for Hatchback: Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; LIGHTING (EXT): REAR COMBINATION LIGHT ASSEMBLY (for Hatchback): INSPECTION

for Sedan: Click here 2020 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 -        ]; LIGHTING (EXT): REAR COMBINATION LIGHT ASSEMBLY (for Sedan): INSPECTION

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPLACE REAR COMBINATION LIGHT ASSEMBLY RH

for Hatchback: Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; LIGHTING (EXT): REAR COMBINATION LIGHT ASSEMBLY (for Hatchback): REMOVAL

for Sedan: Click here 2020 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 -        ]; LIGHTING (EXT): REAR COMBINATION LIGHT ASSEMBLY (for Sedan): REMOVAL