Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001C9SO
Model Year Start: 2019 Model: GR Corolla Prod Date Range: [06/2018 - 01/2019]
Title: METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (for Gasoline Model): B150819; Turn Signal/Hazard Flasher Circuit Current Above Threshold; 2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019]

DTC

B150819

Turn Signal/Hazard Flasher Circuit Current Above Threshold

DESCRIPTION

This DTC is stored when the combination meter assembly detects a short in a turn signal light circuit.

HINT:

If there is a short in a turn signal light circuit, all of the turn signal lights in that circuit will not blink.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B150819

Turn Signal/Hazard Flasher Circuit Current Above Threshold

Diagnosis Condition:

  • Battery voltage is 10 V or more

Malfunction Status:

  • Short in turn signal light circuit
  • Harness or connector
  • Headlight unit assembly
  • Headlight ECU sub-assembly*
  • Outer rear view mirror assembly
  • Side turn signal light assembly
  • Rear combination light cord
  • Rear combination light LED LH
  • Rear combination light LED RH
  • Combination meter assembly
  • *: w/ AFS

WIRING DIAGRAM

LH SIDE

RH SIDE

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly 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 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.

PROCEDURE

1.

CHECK LIGHTS

(a) Inspect the illumination of each turn signal light.

Result

Proceed to

All LH turn signal lights do not blink

A

All RH turn signal lights do not blink

B
B

GO TO STEP 14

A

2.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

w/ AFS

A

w/o AFS

B
B

GO TO STEP 7

A

3.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH AND OUTER REAR VIEW MIRROR ASSEMBLY LH - COMBINATION METER ASSEMBLY)

(a) Disconnect the A21 headlight assembly LH connector.

(b) Disconnect the L9 outer rear view mirror assembly LH connector.

(c) Disconnect the I5 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A21-1 (TNS), L9-5 (B) or I5-1 (LL) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK LH SIDE LIGHTS (HEADLIGHT ASSEMBLY LH)

(a) Connect the L9 outer rear view mirror assembly LH connector.

(b) Connect the I5 combination meter assembly connector.

(c) Operate the turn signal switch and check that the LH side turn signal lights other than the front turn signal light blink.

HINT:

If the LH side turn signal lights blink, the headlight assembly LH is malfunctioning.

Result

Proceed to

LH side turn signal lights blink

A

LH side turn signal lights do not blink

B
B

GO TO STEP 9

A

5.

CHECK LH SIDE LIGHTS (HEADLIGHT CORD (HEADLIGHT UNIT ASSEMBLY LH))

(a) Remove the headlight cord (headlight unit assembly LH).

Click here 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: DISASSEMBLY

(b) Connect the A21 headlight assembly LH connector.

(c) Operate the turn signal switch and check that the LH side turn signal lights other than the front turn signal light blink.

HINT:

If the LH side turn signal lights blink, the headlight ECU sub-assembly LH or turn signal light (headlight unit assembly LH) are malfunctioning.

Result

Proceed to

LH side turn signal lights blink

A

LH side turn signal lights do not blink

B
B

REPLACE HEADLIGHT UNIT ASSEMBLY LH

A

6.

CHECK LH SIDE LIGHTS (HEADLIGHT ECU SUB-ASSEMBLY LH)

(a) Remove the headlight ECU sub-assembly LH.

Click here 2019 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 09/2022]; LIGHTING (EXT): HEADLIGHT ECU: REMOVAL

(b) Connect the A headlight ECU sub-assembly LH connector.

(c) Operate the turn signal switch and check that the LH side turn signal lights other than the front turn signal light blink.

HINT:

If the LH side turn signal lights blink, the turn signal light (headlight unit assembly LH) is malfunctioning.

Result

Proceed to

LH side turn signal lights blink

A

LH side turn signal lights do not blink

B
A

REPLACE HEADLIGHT UNIT ASSEMBLY LH

B

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

7.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH AND OUTER REAR VIEW MIRROR ASSEMBLY LH - COMBINATION METER ASSEMBLY)

(a) Disconnect the A83 headlight assembly LH connector.

(b) Disconnect the L9 outer rear view mirror assembly LH connector.

(c) Disconnect the I5 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A83-2 (B), L9-5 (B) or I5-1 (LL) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

8.

CHECK LH SIDE LIGHTS (HEADLIGHT ASSEMBLY LH)

(a) Connect the L9 outer rear view mirror assembly LH connector.

(b) Connect the I5 combination meter assembly connector.

(c) Operate the turn signal switch and check that the LH side turn signal lights other than the front turn signal light blink.

HINT:

If the LH side turn signal lights blink, the headlight assembly LH is malfunctioning.

Result

Proceed to

LH side turn signal lights blink

A

LH side turn signal lights do not blink

B
A

REPLACE HEADLIGHT UNIT ASSEMBLY LH

B

9.

CHECK LH SIDE LIGHTS (OUTER REAR VIEW MIRROR ASSEMBLY LH)

(a) Connect the A21*1 or A83*2 headlight assembly LH connector.

  • *1: w/ AFS
  • *2: w/o AFS

(b) Disconnect the L9 outer rear view mirror assembly LH connector.

(c) Operate the turn signal switch and check that the LH side turn signal lights other than the side turn signal light blink.

HINT:

If the LH side turn signal lights blink, the outer rear view mirror assembly LH is malfunctioning.

Result

Proceed to

LH side turn signal lights blink

A

LH side turn signal lights do not blink

B
B

GO TO STEP 11

A

10.

CHECK LH SIDE LIGHTS (SIDE TURN SIGNAL LIGHT ASSEMBLY LH)

(a) Remove the side turn signal light assembly LH from outer rear view mirror assembly LH.

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; LIGHTING (EXT): SIDE TURN SIGNAL LIGHT ASSEMBLY: REMOVAL

(b) Connect the L9 outer rear view mirror assembly LH connector.

(c) Operate the turn signal switch and check that the LH side turn signal lights other than the side turn signal light blink.

HINT:

If the LH side turn signal lights blink, the side turn signal light assembly LH is malfunctioning.

Result

Proceed to

LH side turn signal lights blink

A

LH side turn signal lights do not blink

B
A

REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY LH

B

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH

11.

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

(a) Connect the L9 outer rear view mirror assembly LH connector.

(b) Disconnect the O43 rear combination light assembly LH connector.

(c) Disconnect the I5 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O43-4 (B) or I5-5 (TRNL) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

12.

CHECK LH SIDE LIGHTS (REAR COMBINATION LIGHT ASSEMBLY LH)

(a) Connect the I5 combination meter assembly connector.

(b) Operate the turn signal switch and check that the LH side turn signal lights other than the rear turn signal light blink.

HINT:

If the LH side turn signal lights blink, the rear combination light assembly LH is malfunctioning.

Result

Proceed to

LH side turn signal lights blink

A

LH side turn signal lights do not blink

B
B

REPLACE COMBINATION METER ASSEMBLY

A

13.

CHECK LH SIDE LIGHTS (REAR COMBINATION LIGHT LED LH)

(a) Remove the rear combination light LED LH from rear combination light assembly LH.

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; LIGHTING (EXT): REAR COMBINATION LIGHT ASSEMBLY (for Hatchback): DISASSEMBLY

(b) Connect the O43 rear combination light assembly LH connector.

(c) Operate the turn signal switch and check that the LH side turn signal lights other than the rear turn signal light blink.

HINT:

If the LH side turn signal lights blink, the rear combination light LED LH is malfunctioning.

Result

Proceed to

LH side turn signal lights blink

A

LH side turn signal lights do not blink

B
A

REPLACE REAR COMBINATION LIGHT LED LH

B

REPLACE REAR COMBINATION LIGHT CORD LH

14.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

w/ AFS

A

w/o AFS

B
B

GO TO STEP 19

A

15.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH AND OUTER REAR VIEW MIRROR ASSEMBLY RH - COMBINATION METER ASSEMBLY)

(a) Disconnect the A20 headlight assembly RH connector.

(b) Disconnect the K10 outer rear view mirror assembly RH connector.

(c) Disconnect the I5 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A20-1 (TNS), K10-5 (B) or I5-2 (LR) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

16.

CHECK RH SIDE LIGHTS (HEADLIGHT ASSEMBLY RH)

(a) Connect the K10 outer rear view mirror assembly RH connector.

(b) Connect the I5 combination meter assembly connector.

(c) Operate the turn signal switch and check that the RH side turn signal lights other than the front turn signal light blink.

HINT:

If the RH side turn signal lights blink, the headlight assembly RH is malfunctioning.

Result

Proceed to

RH side turn signal lights blink

A

RH side turn signal lights do not blink

B
B

GO TO STEP 21

A

17.

CHECK RH SIDE LIGHTS (HEADLIGHT CORD (HEADLIGHT UNIT ASSEMBLY RH))

(a) Remove the headlight cord (headlight unit assembly RH).

Click here 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; LIGHTING (EXT): HEADLIGHT ASSEMBLY: DISASSEMBLY

(b) Connect the A20 headlight assembly RH connector.

(c) Operate the turn signal switch and check that the RH side turn signal lights other than the front turn signal light blink.

HINT:

If the RH side turn signal lights blink, the headlight ECU sub-assembly RH or turn signal light (headlight unit assembly RH) are malfunctioning.

Result

Proceed to

RH side turn signal lights blink

A

RH side turn signal lights do not blink

B
B

REPLACE HEADLIGHT UNIT ASSEMBLY RH

A

18.

CHECK RH SIDE LIGHTS (HEADLIGHT ECU SUB-ASSEMBLY RH)

(a) Remove the headlight ECU sub-assembly RH.

Click here 2019 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 09/2022]; LIGHTING (EXT): HEADLIGHT ECU: REMOVAL

(b) Connect the C headlight ECU sub-assembly RH connector.

(c) Operate the turn signal switch and check that the RH side turn signal lights other than the front turn signal light blink.

HINT:

If the RH side turn signal lights blink, the turn signal light (headlight unit assembly RH) is malfunctioning.

Result

Proceed to

RH side turn signal lights blink

A

RH side turn signal lights do not blink

B
A

REPLACE HEADLIGHT UNIT ASSEMBLY RH

B

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

19.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH AND OUTER REAR VIEW MIRROR ASSEMBLY RH - COMBINATION METER ASSEMBLY)

(a) Disconnect the A82 headlight assembly RH connector.

(b) Disconnect the K10 outer rear view mirror assembly RH connector.

(c) Disconnect the I5 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A82-2 (B), K10-5 (B) or I5-2 (LR) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

20.

CHECK RH SIDE LIGHTS (HEADLIGHT ASSEMBLY RH)

(a) Connect the K10 outer rear view mirror assembly RH connector.

(b) Connect the I5 combination meter assembly connector.

(c) Operate the turn signal switch and check that the RH side turn signal lights other than the front turn signal light blink.

HINT:

If the RH side turn signal lights blink, the headlight assembly RH is malfunctioning.

Result

Proceed to

RH side turn signal lights blink

A

RH side turn signal lights do not blink

B
A

REPLACE HEADLIGHT UNIT ASSEMBLY RH

B

21.

CHECK RH SIDE LIGHTS (OUTER REAR VIEW MIRROR ASSEMBLY RH)

(a) Connect the A20*1 or A82*2 headlight assembly RH connector.

  • *1: w/ AFS
  • *2: w/o AFS

(b) Disconnect the K10 outer rear view mirror assembly RH connector.

(c) Operate the turn signal switch and check that the RH side turn signal lights other than the side turn signal light blink.

HINT:

If the RH side turn signal lights blink, the outer rear view mirror assembly RH is malfunctioning.

Result

Proceed to

RH side turn signal lights blink

A

RH side turn signal lights do not blink

B
B

GO TO STEP 23

A

22.

CHECK RH SIDE LIGHTS (SIDE TURN SIGNAL LIGHT ASSEMBLY RH)

(a) Remove the side turn signal light assembly RH from outer rear view mirror assembly RH.

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; LIGHTING (EXT): SIDE TURN SIGNAL LIGHT ASSEMBLY: REMOVAL

(b) Connect the K10 outer rear view mirror assembly RH connector.

(c) Operate the turn signal switch and check that the RH side turn signal lights other than the side turn signal light blink.

HINT:

If the RH side turn signal lights blink, the side turn signal light assembly RH is malfunctioning.

Result

Proceed to

RH side turn signal lights blink

A

RH side turn signal lights do not blink

B
A

REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY RH

B

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH

23.

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

(a) Connect the K10 outer rear view mirror assembly RH connector.

(b) Disconnect the O42 rear combination light assembly RH connector.

(c) Disconnect the I5 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O42-4 (B) or I5-6 (TRNR) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

24.

CHECK RH SIDE LIGHTS (REAR COMBINATION LIGHT ASSEMBLY RH)

(a) Connect the I5 combination meter assembly connector.

(b) Operate the turn signal switch and check that the RH side turn signal lights other than the rear turn signal light blink.

HINT:

If the RH side turn signal lights blink, the rear combination light assembly RH is malfunctioning.

Result

Proceed to

RH side turn signal lights blink

A

RH side turn signal lights do not blink

B
B

REPLACE COMBINATION METER ASSEMBLY

A

25.

CHECK RH SIDE LIGHTS (REAR COMBINATION LIGHT LED RH)

(a) Remove the rear combination light LED RH from rear combination light assembly RH.

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; LIGHTING (EXT): REAR COMBINATION LIGHT ASSEMBLY (for Hatchback): DISASSEMBLY

(b) Connect the O42 rear combination light assembly RH connector.

(c) Operate the turn signal switch and check that the RH side turn signal lights other than the rear turn signal light blink.

HINT:

If the RH side turn signal lights blink, the rear combination light LED RH is malfunctioning.

Result

Proceed to

RH side turn signal lights blink

A

RH side turn signal lights do not blink

B
A

REPLACE REAR COMBINATION LIGHT LED RH

B

REPLACE REAR COMBINATION LIGHT CORD RH