| Last Modified: 08-22-2025 | 6.11:8.1.0 | Doc ID: RM0000003TPDF1X |
| Model Year Start: 2026 | Model: GR Corolla | Prod Date Range: [08/2025 - ] |
| Title: METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (for 12.3 Inch Display): B150718; Turn Signal Light Circuit Current Below Threshold; 2026 MY Corolla Corolla Hatchback Corolla HV GR Corolla [08/2025 - ] | ||
|
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 |
|---|---|---|---|
|
B150718 |
Turn Signal Light Circuit Current Below Threshold |
Diagnosis Condition:
Malfunction Status:
|
|
WIRING DIAGRAM
LH SIDE
except G16E-GTS
for G16E-GTS
RH SIDE
except G16E-GTS
for G16E-GTS
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.
- Inspect the turn signal light bulbs before performing the following procedure.
-
When replacing the combination meter assembly, update the ECU security key.
Click here
![2023 - 2026 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)
PROCEDURE
|
1. |
CONFIRM MODEL |
(a) Choose the model to be inspected.
|
Result |
Proceed to |
|---|---|
|
except G16E-GTS |
A |
|
for G16E-GTS |
B |
| B |
|
|
|
2. |
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 |
|
|
|
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 |
|
A134-3 (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. |
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 |
|
|
6. |
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
|
|
7. |
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 |
|
A132-3 (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 |
|
|
8. |
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 |
|
|
9. |
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 |
|
|
10. |
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
|
|
11. |
INSPECT LIGHTS |
(a) Inspect the illumination of each turn signal light.
|
Result |
Proceed to |
|---|---|
|
Front turn signal light LH does not blink |
A |
|
Rear turn signal light LH does not blink |
B |
|
Front turn signal light RH does not blink |
C |
|
Rear turn signal light RH does not blink |
D |
| B |
|
| C |
|
| D |
|
|
|
12. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the A170 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 |
|---|---|---|
|
A170-6 (B) - I5-5 (LL) |
Always |
Below 1 Ω |
|
A170-5 (E) - Body ground*1 |
Always |
Below 1 Ω |
|
A170-3 (E) - Body ground*2 |
Always |
Below 1 Ω |
- *1: w/ Manual Leveling System
- *2: w/o Manual Leveling System
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
13. |
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 |
|
|
14. |
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) - I5-22 (TRNL) |
Always |
Below 1 Ω |
|
O43-3 (E) - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
15. |
INSPECT REAR COMBINATION LIGHT ASSEMBLY LH |
Click here
| OK |
|
| NG |
|
|
16. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the A171 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 |
|---|---|---|
|
A171-6 (B) - I5-6 (LR) |
Always |
Below 1 Ω |
|
A171-5 (E) - Body ground*1 |
Always |
Below 1 Ω |
|
A171-3 (E) - Body ground*2 |
Always |
Below 1 Ω |
- *1: w/ Manual Leveling System
- *2: w/o Manual Leveling System
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
17. |
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 |
|
|
18. |
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) - I5-21 (TRNR) |
Always |
Below 1 Ω |
|
O42-3 (E) - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
19. |
INSPECT REAR COMBINATION LIGHT ASSEMBLY RH |
Click here
| OK |
|
| NG |
|
|
|