| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM10000000257B1 |
| Model Year Start: 2023 | Model: GR Corolla | Prod Date Range: [09/2022 - 11/2022] |
| Title: METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (except 12.3 Inch Display): B150718; Turn Signal Light Circuit Current Below Threshold; 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 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:
Malfunction Status:
|
for TMC Made
for TMMMS Made
|
Combination Meter |
A |
- *1: for LED Type Front Turn Signal Light
- *2: for Bulb Type Front Turn Signal Light
WIRING DIAGRAM
FOR TMC MADE
FOR TMMMS MADE
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.
-
for TMC Made
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](/t3Portal/stylegraphics/info.gif)
- 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 |
|
| C |
|
| D |
|
|
|
2. |
CONFIRM MODEL |
(a) Choose the model to be inspected.
|
Result |
Proceed to |
|---|---|
|
for TMC Made |
A |
|
for TMMC Made |
B |
| B |
|
|
|
3. |
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 |
Always |
Below 1 Ω |
- *1: for LED Type Front Turn Signal Light
- *2: for Bulb Type Front Turn Signal Light
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
CHECK TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY LH) |
(a) Remove the headlight assembly LH.
HINT:
Click here
(b) Remove the Headlight Assembly RH.
HINT:
Click here
(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 |
|
| B |
|
|
5. |
CONFIRM MODEL |
(a) Choose the model to be inspected.
|
Result |
Proceed to |
|---|---|
|
LED Type |
A |
|
Bulb Type |
B |
| B |
|
|
|
6. |
CHECK LH SIDE FRONT TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY LH) |
(a) Interchange the headlight assembly LH with RH and connect the connectors.
Click here
(b) Operate the turn signal switch and check that the LH side front turn signal light operates normally.
HINT:
If the LH side front turn signal light operates normally, the headlight assembly LH is malfunctioning.
|
Result |
Proceed to |
|---|---|
|
LH side front turn signal light operates normally |
A |
|
Problem symptoms do not change (LH side front turn signal light does not blink) |
B |
| A |
|
|
|
7. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the A83 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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A83-2 (B) - I5-1 (LL) |
Always |
Below 1 Ω |
|
A83-3 (E) - Body ground |
Always |
Below 1 Ω |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
8. |
CHECK LH SIDE FRONT TURN SIGNAL LIGHT (FRONT TURN SIGNAL LIGHT SOCKET LH) |
(a) Interchange the front turn signal light socket LH with RH and connect the connectors.
Click here
(b) Operate the turn signal switch and check that the LH side front turn signal light operates normally.
HINT:
If the LH side front turn signal light operates normally, the front turn signal light socket LH is malfunctioning.
|
Result |
Proceed to |
|---|---|
|
LH side front turn signal light operates normally |
A |
|
Problem symptoms do not change (LH side front turn signal light does not blink) |
B |
| A |
|
|
|
9. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the A122 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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A122-1 (B) - I5-1 (LL) |
Always |
Below 1 Ω |
|
A122-3 (E) - Body ground |
Always |
Below 1 Ω |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
10. |
CONFIRM MODEL |
(a) Choose the model to be inspected.
|
Result |
Proceed to |
|---|---|
|
for TMC Made |
A |
|
for TMMC Made |
B |
| B |
|
|
|
11. |
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 |
|
|
12. |
INSPECT REAR COMBINATION LIGHT ASSEMBLY LH |
for Hatchback: Click here
for Sedan: Click here
| OK |
|
| NG |
|
REPLACE REAR COMBINATION LIGHT ASSEMBLY LH for Hatchback: Click here
for Sedan: Click here
|
|
13. |
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 |
|
|
|
14. |
CHECK LH SIDE REAR TURN SIGNAL LIGHT (REAR COMBINATION LIGHT CORD LH) |
(a) Interchange the rear combination light cord LH with RH and connect the connectors.
Click here
(b) Operate the turn signal switch and check that the LH side rear turn signal light operates normally.
HINT:
If the LH side rear turn signal lights operates normally, the rear combination light cord LH is malfunctioning.
|
Result |
Proceed to |
|---|---|
|
LH side rear turn signal lights operates normally |
A |
|
Problem symptoms do not change (LH side rear turn signal light does not blink) |
B |
| A |
|
|
|
15. |
CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the O104 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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
O104-3 (B) - I5-5 (TRNL) |
Always |
Below 1 Ω |
|
O104-4 (E) - Body ground |
Always |
Below 1 Ω |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
16. |
CHECK LH SIDE REAR TURN SIGNAL LIGHT (REAR COMBINATION LIGHT ASSEMBLY LH) |
(a) Interchange the rear combination light assembly LH with RH and connect the connectors.
Click here
(b) Operate the turn signal switch and check that the LH side rear turn signal light operates normally.
HINT:
If the LH side rear turn signal lights operates normally, a component of the rear combination light assembly LH is malfunctioning.
|
Result |
Proceed to |
|---|---|
|
LH side rear turn signal lights operates normally |
A |
|
Problem symptoms do not change (LH side rear turn signal light does not blink) |
B |
| B |
|
|
|
17. |
INSPECT REAR COMBINATION LIGHT LED LH |
(a) Remove the rear combination light LED LH from rear combination light assembly LH.
Click here
(b) Inspect the rear combination light LED LH.
Click here
| OK |
|
| NG |
|
|
18. |
CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the O43 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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
O43-4 (B) - I5-5 (TRNL) |
Always |
Below 1 Ω |
|
O43-3 (E) - Body ground |
Always |
Below 1 Ω |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
19. |
CONFIRM MODEL |
(a) Choose the model to be inspected.
|
Result |
Proceed to |
|---|---|
|
for TMC Made |
A |
|
for TMMC Made |
B |
| B |
|
|
|
20. |
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 |
Always |
Below 1 Ω |
- *1: for LED Type Front Turn Signal Light
- *2: for Bulb Type Front Turn Signal Light
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
21. |
CHECK TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY RH) |
(a) Remove the headlight assembly RH.
HINT:
Click here
(b) Remove the Headlight Assembly LH.
HINT:
Click here
(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 |
|
| B |
|
|
22. |
CONFIRM MODEL |
(a) Choose the model to be inspected.
|
Result |
Proceed to |
|---|---|
|
LED Type |
A |
|
Bulb Type |
B |
| B |
|
|
|
23. |
CHECK RH SIDE FRONT TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY RH) |
(a) Interchange the headlight assembly RH with LH and connect the connectors.
Click here
(b) Operate the turn signal switch and check that the RH side front turn signal light operates normally.
HINT:
If the RH side front turn signal light operates normally, the headlight assembly RH is malfunctioning.
|
Result |
Proceed to |
|---|---|
|
RH side front turn signal light operates normally |
A |
|
Problem symptoms do not change (RH side front turn signal light does not blink) |
B |
| A |
|
|
|
24. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the A82 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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A82-2 (B) - I5-2 (LR) |
Always |
Below 1 Ω |
|
A82-3 (E) - Body ground |
Always |
Below 1 Ω |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
25. |
CHECK RH SIDE FRONT TURN SIGNAL LIGHT (FRONT TURN SIGNAL LIGHT SOCKET RH) |
(a) Interchange the front turn signal light socket RH with LH and connect the connectors.
Click here
(b) Operate the turn signal switch and check that the RH side front turn signal light operates normally.
HINT:
If the RH side front turn signal light operates normally, the front turn signal light socket RH is malfunctioning.
|
Result |
Proceed to |
|---|---|
|
RH side front turn signal light operates normally |
A |
|
Problem symptoms do not change (RH side front turn signal light does not blink) |
B |
| A |
|
|
|
26. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the A121 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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A121-1 (B) - I5-2 (LR) |
Always |
Below 1 Ω |
|
A121-3 (E) - Body ground |
Always |
Below 1 Ω |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
27. |
CONFIRM MODEL |
(a) Choose the model to be inspected.
|
Result |
Proceed to |
|---|---|
|
for TMC Made |
A |
|
for TMMC Made |
B |
| B |
|
|
|
28. |
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 |
|
|
29. |
INSPECT REAR COMBINATION LIGHT ASSEMBLY RH |
for Hatchback: Click here
for Sedan: Click here
| OK |
|
| NG |
|
REPLACE REAR COMBINATION LIGHT ASSEMBLY RH for Hatchback: Click here
for Sedan: Click here
|
|
30. |
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 |
|
|
|
31. |
CHECK RH SIDE REAR TURN SIGNAL LIGHT (REAR COMBINATION LIGHT CORD RH) |
(a) Interchange the rear combination light cord RH with LH and connect the connectors.
Click here
(b) Operate the turn signal switch and check that the RH side rear turn signal light operates normally.
HINT:
If the RH side rear turn signal lights operates normally, the rear combination light cord RH is malfunctioning.
|
Result |
Proceed to |
|---|---|
|
RH side rear turn signal lights operates normally |
A |
|
Problem symptoms do not change (RH side rear turn signal light does not blink) |
B |
| A |
|
|
|
32. |
CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the O103 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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
O103-3 (B) - I5-6 (TRNR) |
Always |
Below 1 Ω |
|
O103-4 (E) - Body ground |
Always |
Below 1 Ω |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
33. |
CHECK RH SIDE REAR TURN SIGNAL LIGHT (REAR COMBINATION LIGHT ASSEMBLY RH) |
(a) Interchange the rear combination light assembly RH with LH and connect the connectors.
Click here
(b) Operate the turn signal switch and check that the RH side rear turn signal light operates normally.
HINT:
If the RH side rear turn signal lights operates normally, a component of the rear combination light assembly RH is malfunctioning.
|
Result |
Proceed to |
|---|---|
|
RH side rear turn signal lights operates normally |
A |
|
Problem symptoms do not change (RH side rear turn signal light does not blink) |
B |
| B |
|
|
|
34. |
INSPECT REAR COMBINATION LIGHT LED RH |
(a) Remove the rear combination light LED RH from rear combination light assembly RH.
Click here
(b) Inspect the rear combination light LED RH.
Click here
| OK |
|
| NG |
|
|
35. |
CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the O42 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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
O42-4 (B) - I5-6 (TRNR) |
Always |
Below 1 Ω |
|
O42-3 (E) - Body ground |
Always |
Below 1 Ω |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|