Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001I0V3
Model Year Start: 2020 Model: GR Corolla Prod Date Range: [03/2019 - 09/2022]
Title: METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (for Gasoline Model): B150819; Turn Signal/Hazard Flasher Circuit Current Above Threshold; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [03/2019 - 09/2022]

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
  • Outer rear view mirror assembly*1
  • Side turn signal light assembly*1
  • Harness or connector
  • Combination meter assembly

for TMC Made

  • Headlight ECU sub-assembly*2
  • Headlight unit assembly*3
  • Front turn signal light socket*4
  • Front turn signal light bulb*4
  • Rear combination light cord
  • Rear combination light LED*5
  • Rear turn signal light bulb*6

for TMMMS Made

  • Headlight assembly*3
  • Front turn signal light socket*4
  • Front turn signal light bulb*4
  • Rear combination light cord
  • Rear turn signal light bulb
  • *1: w/ Side Turn Signal Light
  • *2: w/ AFS
  • *3: for LED Type Front Turn Signal Light
  • *4: for Bulb Type Front Turn Signal Light
  • *5: for LED Type Rear Turn Signal Light
  • *6: for Bulb Type Rear Turn Signal Light

WIRING DIAGRAM

FOR TMC MADE

FOR TMMMS MADE

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.*
  • Inspect the turn signal light bulbs before performing the following procedure.
    • *: w/ AFS

PROCEDURE

1.

CHECK SYMPTOMS

(a) Check the problem symptoms.

Result

Proceed to

All LH side turn signal lights do not blink

A

All RH side turn signal lights do not blink

B

B

GO TO STEP 20

A

2.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

Specifications

Front Turn Signal Light

for TMC Made

LED Type

(w/ AFS)

A

LED Type

(w/o AFS)

B

Bulb Type

C

for TMMMS Made

LED Type

D

Bulb Type

E

B

GO TO STEP 6

C

GO TO STEP 7

D

GO TO STEP 14

E

GO TO STEP 15

A

3.

CHECK LH SIDE TURN SIGNAL LIGHTS (FRONT TURN SIGNAL LIGHT CIRCUIT)

(a) Disconnect the A23 headlight assembly LH connector.

(b) 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 other than the front turn signal light blink, a component of the headlight assembly LH is malfunctioning.

Result

Proceed to

LH side turn signal lights other than the front turn signal light blink

A

Problem symptoms do not change

(All LH side turn signal lights do not blink)

(w/ Side Turn Signal Light)

B

Problem symptoms do not change

(All LH side turn signal lights do not blink)

(w/o Side Turn Signal Light)

C

B

GO TO STEP 8

C

GO TO STEP 9

A

4.

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

(a) Connect the headlight assembly LH connector.

(b) Disconnect the B headlight cord (headlight unit 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 all LH side turn signal lights do not blink, the headlight cord (headlight unit assembly LH) is malfunctioning.

Result

Proceed to

LH side turn signal lights other than the front turn signal light blink

A

All LH side turn signal lights do not blink

B

B

REPLACE HEADLIGHT UNIT ASSEMBLY LH

A

5.

CHECK LH SIDE TURN SIGNAL 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 headlight cord (headlight unit assembly LH) connector to the 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 all LH side turn signal lights do not blink, the headlight ECU sub-assembly LH is malfunctioning.

Result

Proceed to

LH side turn signal lights other than the front turn signal light blink

A

All LH side turn signal lights do not blink

B

A

REPLACE HEADLIGHT UNIT ASSEMBLY LH

B

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

6.

CHECK LH SIDE TURN SIGNAL LIGHTS (FRONT TURN SIGNAL LIGHT CIRCUIT)

(a) Disconnect the A83 headlight assembly LH connector.

(b) 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 other than the front turn signal light blink, the headlight unit assembly LH is malfunctioning.

Result

Proceed to

LH side turn signal lights other than the front turn signal light blink

A

Problem symptoms do not change

(All LH side turn signal lights do not blink)

(w/ Side Turn Signal Light)

B

Problem symptoms do not change

(All LH side turn signal lights do not blink)

(w/o Side Turn Signal Light)

C

A

REPLACE HEADLIGHT UNIT ASSEMBLY LH

B

GO TO STEP 8

C

GO TO STEP 9

7.

CHECK LH SIDE TURN SIGNAL LIGHTS (FRONT TURN SIGNAL LIGHT CIRCUIT)

(a) Disconnect the A90 headlight assembly LH connector.

(b) 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 other than the front turn signal light blink, the front turn signal light socket LH is malfunctioning.

Result

Proceed to

LH side turn signal lights other than the front turn signal light blink

A

Problem symptoms do not change

(All LH side turn signal lights do not blink)

(w/ Side Turn Signal Light)

B

Problem symptoms do not change

(All LH side turn signal lights do not blink)

(w/o Side Turn Signal Light)

C

A

REPLACE FRONT TURN SIGNAL LIGHT SOCKET LH

C

GO TO STEP 9

B

8.

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

(a) Connect the headlight assembly LH connector.

(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 other than the side turn signal light blink, a component of the outer rear view mirror assembly LH is malfunctioning.

Result

Proceed to

LH side turn signal lights other than the side turn signal light blink

A

Problem symptoms do not change

(All LH side turn signal lights do not blink)

B

A

GO TO STEP 17

B

GO TO STEP 9

9.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

for Bulb Type Rear Turn Signal Light

A

for LED Type Rear Turn Signal Light

B

B

GO TO STEP 11

A

10.

CHECK LH SIDE TURN SIGNAL LIGHTS (REAR TURN SIGNAL LIGHT CIRCUIT)

(a) Connect the outer rear view mirror assembly LH connector.*1

(b) Connect the headlight assembly LH connector.*2

(c) Disconnect the O104 rear combination light assembly LH connector.

(d) 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 other than the rear turn signal light blink, the rear combination light cord LH is malfunctioning.

  • *1: w/ Side Turn Signal Light
  • *2: w/o Side Turn Signal Light

Result

Proceed to

LH side turn signal lights other than the rear turn signal light blink

A

Problem symptoms do not change

(All LH side turn signal lights do not blink)

B

A

REPLACE REAR COMBINATION LIGHT CORD LH

B

GO TO STEP 13

11.

CHECK LH SIDE TURN SIGNAL LIGHTS (REAR TURN SIGNAL LIGHT CIRCUIT)

(a) Connect the outer rear view mirror assembly LH connector.*1

(b) Connect the headlight assembly LH connector.*2

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

(d) 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 other than the rear turn signal light blink, a component of the rear combination light assembly LH is malfunctioning.

  • *1: w/ Side Turn Signal Light
  • *2: w/o Side Turn Signal Light

Result

Proceed to

LH side turn signal lights other than the rear turn signal light blink

A

Problem symptoms do not change

(All LH side turn signal lights do not blink)

B

B

GO TO STEP 13

A

12.

CHECK LH SIDE TURN SIGNAL LIGHTS (REAR COMBINATION LIGHT CORD 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 wire harness connector to the 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 all LH side turn signal lights do not blink, the rear combination light cord LH is malfunctioning.

Result

Proceed to

LH side turn signal lights other than the rear turn signal light blink

A

All LH side turn signal lights do not blink

B

A

REPLACE REAR COMBINATION LIGHT LED LH

B

REPLACE REAR COMBINATION LIGHT CORD LH

13.

CHECK HARNESS AND CONNECTOR (LH SIDE EACH PARTS - COMBINATION METER ASSEMBLY)

(a) Disconnect the A21*1, A83*2 or A90*3 headlight assembly LH connector.

(b) Disconnect the L9 outer rear view mirror assembly LH connector.*4

(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)*1, A83-2 (B)*2, A90-1 (B)*3, L9-5 (B)*4 or I5-1 (LL) - Body ground

Always

10 kΩ or higher

O43-4 (B)*5, O104-3 (B)*6 or I5-5 (TRNL) - Body ground

Always

10 kΩ or higher

  • *1: w/ AFS
  • *2: for LED Type Front Turn Signal Light without AFS
  • *3: for Bulb Type Front Turn Signal Light without AFS
  • *4: w/ Side Turn Signal Light
  • *5: for LED Type Rear Turn Signal Light
  • *6: for Bulb Type Rear Turn Signal Light
OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.

CHECK LH SIDE TURN SIGNAL LIGHTS (FRONT TURN SIGNAL LIGHT CIRCUIT)

(a) Disconnect the A83 headlight assembly LH connector.

(b) 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 other than the front turn signal light blink, the headlight assembly LH is malfunctioning.

Result

Proceed to

LH side turn signal lights other than the front turn signal light blink

A

Problem symptoms do not change

(All LH side turn signal lights do not blink)

(w/ Side Turn Signal Light)

B

Problem symptoms do not change

(All LH side turn signal lights do not blink)

(w/o Side Turn Signal Light)

C

A

REPLACE HEADLIGHT ASSEMBLY LH

B

GO TO STEP 16

C

GO TO STEP 18

15.

CHECK LH SIDE TURN SIGNAL LIGHTS (FRONT TURN SIGNAL LIGHT CIRCUIT)

(a) Disconnect the A122 headlight assembly LH connector.

(b) 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 other than the front turn signal light blink, the front turn signal light socket LH is malfunctioning.

Result

Proceed to

LH side turn signal lights other than the front turn signal light blink

A

Problem symptoms do not change

(All LH side turn signal lights do not blink)

(w/ Side Turn Signal Light)

B

Problem symptoms do not change

(All LH side turn signal lights do not blink)

(w/o Side Turn Signal Light)

C

A

REPLACE FRONT TURN SIGNAL LIGHT SOCKET LH

C

GO TO STEP 18

B

16.

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

(a) Connect the headlight assembly LH connector.

(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 other than the side turn signal light blink, a component of the outer rear view mirror assembly LH is malfunctioning.

Result

Proceed to

LH side turn signal lights other than the side turn signal light blink

A

Problem symptoms do not change

(All LH side turn signal lights do not blink)

B

B

GO TO STEP 18

A

17.

CHECK LH SIDE TURN SIGNAL LIGHTS (OUTER REAR VIEW MIRROR 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 wire harness connector to the 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 all LH side turn signal lights do not blink, the outer rear view mirror assembly LH is malfunctioning.

Result

Proceed to

LH side turn signal lights other than the side turn signal light blink

A

All 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

18.

CHECK LH SIDE TURN SIGNAL LIGHTS (REAR TURN SIGNAL LIGHT CIRCUIT)

(a) Connect the outer rear view mirror assembly LH connector.*1

(b) Connect the headlight assembly LH connector.*2

(c) Disconnect the O104 rear combination light assembly LH connector.

(d) 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 other than the rear turn signal light blink, the rear combination light cord LH is malfunctioning.

  • *1: w/ Side Turn Signal Light
  • *2: w/o Side Turn Signal Light

Result

Proceed to

LH side turn signal lights other than the rear turn signal light blink

A

Problem symptoms do not change

(All LH side turn signal lights do not blink)

B

A

REPLACE REAR COMBINATION LIGHT CORD LH

B

19.

CHECK HARNESS AND CONNECTOR (LH SIDE EACH PARTS - COMBINATION METER ASSEMBLY)

(a) Disconnect the A83*1 or A122*2 headlight assembly LH connector.

(b) Disconnect the L9 outer rear view mirror assembly LH connector.*3

(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)*1, A122-1 (B)*2, L9-5 (B)*3 or I5-1 (LL) - Body ground

Always

10 kΩ or higher

O104-3 (B) or I5-5 (TRNL) - Body ground

Always

10 kΩ or higher

  • *1: for LED Type Front Turn Signal Light
  • *2: for Bulb Type Front Turn Signal Light
  • *3: w/ Side Turn Signal Light
OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

20.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

Specifications

Front Turn Signal Light

for TMC Made

LED Type

(w/ AFS)

A

LED Type

(w/o AFS)

B

Bulb Type

C

for TMMMS Made

LED Type

D

Bulb Type

E

B

GO TO STEP 24

C

GO TO STEP 25

D

GO TO STEP 32

E

GO TO STEP 33

A

21.

CHECK RH SIDE TURN SIGNAL LIGHTS (FRONT TURN SIGNAL LIGHT CIRCUIT)

(a) Disconnect the A20 headlight assembly RH connector.

(b) 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 other than the front turn signal light blink, a component of the headlight assembly RH is malfunctioning.

Result

Proceed to

RH side turn signal lights other than the front turn signal light blink

A

Problem symptoms do not change

(All RH side turn signal lights do not blink)

(w/ Side Turn Signal Light)

B

Problem symptoms do not change

(All RH side turn signal lights do not blink)

(w/o Side Turn Signal Light)

C

B

GO TO STEP 26

C

GO TO STEP 27

A

22.

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

(a) Connect the headlight assembly RH connector.

(b) Disconnect the D headlight cord (headlight unit 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 all RH side turn signal lights do not blink, the headlight cord (headlight unit assembly RH) is malfunctioning.

Result

Proceed to

RH side turn signal lights other than the front turn signal light blink

A

All RH side turn signal lights do not blink

B

B

REPLACE HEADLIGHT UNIT ASSEMBLY RH

A

23.

CHECK RH SIDE TURN SIGNAL 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 headlight cord (headlight unit assembly RH) connector to the 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 all RH side turn signal lights do not blink, the headlight ECU sub-assembly RH is malfunctioning.

Result

Proceed to

RH side turn signal lights other than the front turn signal light blink

A

All RH side turn signal lights do not blink

B

A

REPLACE HEADLIGHT UNIT ASSEMBLY RH

B

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

24.

CHECK RH SIDE TURN SIGNAL LIGHTS (FRONT TURN SIGNAL LIGHT CIRCUIT)

(a) Disconnect the A82 headlight assembly RH connector.

(b) 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 other than the front turn signal light blink, the headlight unit assembly RH is malfunctioning.

Result

Proceed to

RH side turn signal lights other than the front turn signal light blink

A

Problem symptoms do not change

(All RH side turn signal lights do not blink)

(w/ Side Turn Signal Light)

B

Problem symptoms do not change

(All RH side turn signal lights do not blink)

(w/o Side Turn Signal Light)

C

A

REPLACE HEADLIGHT UNIT ASSEMBLY RH

B

GO TO STEP 26

C

GO TO STEP 27

25.

CHECK RH SIDE TURN SIGNAL LIGHTS (FRONT TURN SIGNAL LIGHT CIRCUIT)

(a) Disconnect the A87 headlight assembly RH connector.

(b) 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 other than the front turn signal light blink, the front turn signal light socket is RH malfunctioning.

Result

Proceed to

RH side turn signal lights other than the front turn signal light blink

A

Problem symptoms do not change

(All RH side turn signal lights do not blink)

(w/ Side Turn Signal Light)

B

Problem symptoms do not change

(All RH side turn signal lights do not blink)

(w/o Side Turn Signal Light)

C

A

REPLACE FRONT TURN SIGNAL LIGHT SOCKET RH

C

GO TO STEP 27

B

26.

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

(a) Connect the headlight assembly RH connector.

(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 other than the side turn signal light blink, a component of the outer rear view mirror assembly RH is malfunctioning.

Result

Proceed to

RH side turn signal lights other than the side turn signal light blink

A

Problem symptoms do not change

(All RH side turn signal lights do not blink)

B

A

GO TO STEP 35

B

GO TO STEP 27

27.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

for Bulb Type Rear Turn Signal Light

A

for LED Type Rear Turn Signal Light

B

B

GO TO STEP 29

A

28.

CHECK RH SIDE TURN SIGNAL LIGHTS (REAR TURN SIGNAL LIGHT CIRCUIT)

(a) Connect the outer rear view mirror assembly RH connector.*1

(b) Connect the headlight assembly RH connector.*2

(c) Disconnect the O103 rear combination light assembly RH connector.

(d) 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 other than the rear turn signal light blink, the rear combination light cord RH is malfunctioning.

  • *1: w/ Side Turn Signal Light
  • *2: w/o Side Turn Signal Light

Result

Proceed to

RH side turn signal lights other than the rear turn signal light blink

A

Problem symptoms do not change

(All RH side turn signal lights do not blink)

B

A

REPLACE REAR COMBINATION LIGHT CORD RH

B

GO TO STEP 31

29.

CHECK RH SIDE TURN SIGNAL LIGHTS (REAR TURN SIGNAL LIGHT CIRCUIT)

(a) Connect the outer rear view mirror assembly RH connector.*1

(b) Connect the headlight assembly RH connector.*2

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

(d) 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 other than the rear turn signal light blink, a component of the rear combination light assembly RH is malfunctioning.

  • *1: w/ Side Turn Signal Light
  • *2: w/o Side Turn Signal Light

Result

Proceed to

RH side turn signal lights other than the rear turn signal light blink

A

Problem symptoms do not change

(All RH side turn signal lights do not blink)

B

B

GO TO STEP 31

A

30.

CHECK RH SIDE TURN SIGNAL LIGHTS (REAR COMBINATION LIGHT CORD 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 wire harness connector to the 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 all RH side turn signal lights do not blink, the rear combination light cord RH is malfunctioning.

Result

Proceed to

RH side turn signal lights other than the rear turn signal light blink

A

All RH side turn signal lights do not blink

B

A

REPLACE REAR COMBINATION LIGHT LED RH

B

REPLACE REAR COMBINATION LIGHT CORD RH

31.

CHECK HARNESS AND CONNECTOR (RH SIDE EACH PARTS - COMBINATION METER ASSEMBLY)

(a) Disconnect the A20*1, A82*2 or A87*3 headlight assembly RH connector.

(b) Disconnect the K10 outer rear view mirror assembly RH connector.*4

(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)*1, A82-2 (B)*2, A87-1 (B)*3, K10-5 (B)*4 or I5-2 (LR) - Body ground

Always

10 kΩ or higher

O42-4 (B)*5, O103-3 (B)*6 or I5-6 (TRNR) - Body ground

Always

10 kΩ or higher

  • *1: w/ AFS
  • *2: for LED Type Front Turn Signal Light without AFS
  • *3: for Bulb Type Front Turn Signal Light without AFS
  • *4: w/ Side Turn Signal Light
  • *5: for LED Type Rear Turn Signal Light
  • *6: for Bulb Type Rear Turn Signal Light
OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

32.

CHECK RH SIDE TURN SIGNAL LIGHTS (FRONT TURN SIGNAL LIGHT CIRCUIT)

(a) Disconnect the A82 headlight assembly RH connector.

(b) 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 other than the front turn signal light blink, the headlight assembly RH is malfunctioning.

Result

Proceed to

RH side turn signal lights other than the front turn signal light blink

A

Problem symptoms do not change

(All RH side turn signal lights do not blink)

(w/ Side Turn Signal Light)

B

Problem symptoms do not change

(All RH side turn signal lights do not blink)

(w/o Side Turn Signal Light)

C

A

REPLACE HEADLIGHT ASSEMBLY RH

B

GO TO STEP 34

C

GO TO STEP 36

33.

CHECK RH SIDE TURN SIGNAL LIGHTS (FRONT TURN SIGNAL LIGHT CIRCUIT)

(a) Disconnect the A121 headlight assembly RH connector.

(b) 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 other than the front turn signal light blink, the front turn signal light socket RH is malfunctioning.

Result

Proceed to

RH side turn signal lights other than the front turn signal light blink

A

Problem symptoms do not change

(All RH side turn signal lights do not blink)

(w/ Side Turn Signal Light)

B

Problem symptoms do not change

(All RH side turn signal lights do not blink)

(w/o Side Turn Signal Light)

C

A

REPLACE FRONT TURN SIGNAL LIGHT SOCKET RH

C

GO TO STEP 36

B

34.

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

(a) Connect the headlight assembly RH connector.

(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 other than the side turn signal light blink, a component of the outer rear view mirror assembly RH is malfunctioning.

Result

Proceed to

RH side turn signal lights other than the side turn signal light blink

A

Problem symptoms do not change

(All RH side turn signal lights do not blink)

B

B

GO TO STEP 36

A

35.

CHECK RH SIDE TURN SIGNAL LIGHTS (OUTER REAR VIEW MIRROR 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 wire harness connector to the 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 all RH side turn signal lights do not blink, the outer rear view mirror assembly RH is malfunctioning.

Result

Proceed to

RH side turn signal lights other than the side turn signal light blink

A

All 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

36.

CHECK RH SIDE TURN SIGNAL LIGHTS (REAR TURN SIGNAL LIGHT CIRCUIT)

(a) Connect the outer rear view mirror assembly RH connector.*1

(b) Connect the headlight assembly RH connector.*2

(c) Disconnect the O103 rear combination light assembly RH connector.

(d) 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 other than the rear turn signal light blink, the rear combination light cord RH is malfunctioning.

  • *1: w/ Side Turn Signal Light
  • *2: w/o Side Turn Signal Light

Result

Proceed to

RH side turn signal lights other than the rear turn signal light blink

A

Problem symptoms do not change

(All RH side turn signal lights do not blink)

B

A

REPLACE REAR COMBINATION LIGHT CORD RH

B

37.

CHECK HARNESS AND CONNECTOR (RH SIDE EACH PARTS - COMBINATION METER ASSEMBLY)

(a) Disconnect the A82*1 or A121*2 headlight assembly RH connector.

(b) Disconnect the K10 outer rear view mirror assembly RH connector.*3

(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)*1, A121-1 (B)*2, K10-5 (B)*3 or I5-2 (LR) - Body ground

Always

10 kΩ or higher

O103-3 (B) or I5-6 (TRNR) - Body ground

Always

10 kΩ or higher

  • *1: for LED Type Front Turn Signal Light
  • *2: for Bulb Type Front Turn Signal Light
  • *3: w/ Side Turn Signal Light
OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR