Turn Signal Light Circuit Current Below Threshold (B150718)
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 |
Memory | Note |
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
|
- Harness or connector
- Headlight assembly
- Headlight ECU sub-assembly*
- Rear combination light assembly
- Rear light assembly*
- Rear combination light socket and wire
- Rear light cord*
- Combination meter assembly
| DTC stored |
- |
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.
PROCEDURE
(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 |
| GO TO STEP 8 |
C |
| GO TO STEP 18 |
D |
| GO TO STEP 24 |
A |
| |
(a) Choose the model to be inspected.
Result | Proceed to |
w/ Cornering Light | A |
w/o Cornering Light | B |
B |
| GO TO STEP 6 |
A |
| |
3. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the A8 headlight assembly LH connector.
(b) Disconnect the G15 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition |
Specified Condition |
A8-11 (TNS) - G15-11 (LL) |
Always | Below 1 Ω |
A8-12 (GND) - Body ground |
Always | Below 1 Ω |
NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
| |
4. |
INSPECT HEADLIGHT ECU SUB-ASSEMBLY LH |
*a | Component without harness connected
(Headlight ECU Sub-assembly LH) |
- | - |
(a) Remove the headlight ECU sub-assembly LH.
Click here
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition |
Specified Condition |
B-20 (TURN+) - A8-11 (TNS) |
Always | Below 1 Ω |
B-13 (TURN-) - A8-12 (GND) |
Always | Below 1 Ω |
NG |
| REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH |
OK |
| |
5. |
CHECK HEADLIGHT ASSEMBLY LH |
(a) Connect the G15 combination meter assembly connector.
(b) Remove each headlight ECU sub-assembly, interchange the headlight assembly LH with RH and connect the connectors.
Click here
(c) Check that the front turn signal light operates normally.
OK:
Front turn signal light blinks.
OK |
| REPLACE HEADLIGHT ASSEMBLY LH |
NG |
| REPLACE COMBINATION METER ASSEMBLY |
6. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the A45 headlight assembly LH connector.
(b) Disconnect the G15 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition |
Specified Condition |
A45-2 (B) - G15-11 (LL) |
Always | Below 1 Ω |
A45-7 (E) - Body ground |
Always | Below 1 Ω |
NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
| |
7. |
CHECK HEADLIGHT ASSEMBLY LH |
(a) Connect the G15 combination meter assembly connector.
(b) Interchange the headlight assembly LH with RH and connect the connectors.
Click here
(c) Check that the front turn signal light operates normally.
OK:
Front turn signal light blinks.
OK |
| REPLACE HEADLIGHT ASSEMBLY LH |
NG |
| REPLACE COMBINATION METER ASSEMBLY |
(a) Choose the model to be inspected.
Result | Proceed to |
w/ Cornering Light | A |
w/o Cornering Light | B |
B |
| GO TO STEP 15 |
A |
| |
9. |
CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the P10 rear combination light assembly LH connector.
(b) Disconnect the G15 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition |
Specified Condition |
P10-3 (TRN) - G15-10 (TRNL) |
Always | Below 1 Ω |
P10-4 (E) - Body ground |
Always | Below 1 Ω |
NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
| |
10. |
CHECK REAR COMBINATION LIGHT SOCKET AND WIRE LH |
(a) Connect the G15 combination meter assembly connector.
(b) Interchange the rear combination light socket and wire LH with RH and connect the connectors.
Click here
(c) Check that the rear turn signal light operates normally.
OK:
Rear turn signal light blinks.
OK |
| REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE LH |
NG |
| |
11. |
INSPECT REAR COMBINATION LIGHT ASSEMBLY LH |
(a) Remove the rear combination light assembly LH.
Click here
(b) Inspect the rear combination light assembly LH.
Click here
NG |
| REPLACE REAR COMBINATION LIGHT ASSEMBLY LH |
OK |
| |
12. |
CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the P12 rear light assembly LH connector.
(b) Disconnect the G15 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition |
Specified Condition |
P12-3 (B) - G15-10 (TRNL) |
Always | Below 1 Ω |
P12-4 (E) - Body ground |
Always | Below 1 Ω |
NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
| |
13. |
CHECK REAR LIGHT CORD LH |
(a) Connect the G15 combination meter assembly connector.
(b) Interchange the rear light cord LH with RH and connect the connectors.
Click here
(c) Check that the rear turn signal light operates normally.
OK:
Rear turn signal light blinks.
OK |
| REPLACE REAR LIGHT CORD LH |
NG |
| |
14. |
INSPECT REAR LIGHT ASSEMBLY LH |
(a) Remove the rear light assembly LH.
Click here
(b) Inspect the rear light assembly LH.
Click here
OK |
| REPLACE COMBINATION METER ASSEMBLY |
NG |
| REPLACE REAR LIGHT ASSEMBLY LH |
15. |
CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the P10 rear combination light assembly LH connector.
(b) Disconnect the G15 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition |
Specified Condition |
P10-3 (TRN) - G15-10 (TRNL) |
Always | Below 1 Ω |
P10-4 (E) - Body ground |
Always | Below 1 Ω |
NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
| |
16. |
CHECK REAR COMBINATION LIGHT SOCKET AND WIRE LH |
(a) Connect the G15 combination meter assembly connector.
(b) Interchange the rear combination light socket and wire LH with RH and connect the connectors.
Click here
(c) Check that the rear turn signal light operates normally.
OK:
Rear turn signal light blinks.
OK |
| REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE LH |
NG |
| |
17. |
INSPECT REAR COMBINATION LIGHT ASSEMBLY LH |
(a) Remove the rear combination light assembly LH.
Click here
(b) Inspect the rear combination light assembly LH.
Click here
OK |
| REPLACE COMBINATION METER ASSEMBLY |
NG |
| REPLACE REAR COMBINATION LIGHT ASSEMBLY LH |
(a) Choose the model to be inspected.
Result | Proceed to |
w/ Cornering Light | A |
w/o Cornering Light | B |
B |
| GO TO STEP 22 |
A |
| |
19. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the A9 headlight assembly RH connector.
(b) Disconnect the G15 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition |
Specified Condition |
A9-11 (TNS) - G15-7 (LR) |
Always | Below 1 Ω |
A9-12 (GND) - Body ground |
Always | Below 1 Ω |
NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
| |
20. |
INSPECT HEADLIGHT ECU SUB-ASSEMBLY RH |
*a | Component without harness connected
(Headlight ECU Sub-assembly RH) |
- | - |
(a) Remove the headlight ECU sub-assembly RH.
Click here
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition |
Specified Condition |
C-20 (TURN+) - A9-11 (TNS) |
Always | Below 1 Ω |
C-13 (TURN-) - A9-12 (GND) |
Always | Below 1 Ω |
NG |
| REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH |
OK |
| |
21. |
CHECK HEADLIGHT ASSEMBLY RH |
(a) Connect the G15 combination meter assembly connector.
(b) Remove each headlight ECU sub-assembly, interchange the headlight assembly RH with LH and connect the connectors.
Click here
(c) Check that the front turn signal light operates normally.
OK:
Front turn signal light blinks.
(d) Connect the G15 combination meter assembly connector.
OK |
| REPLACE HEADLIGHT ASSEMBLY RH |
NG |
| REPLACE COMBINATION METER ASSEMBLY |
22. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the A44 headlight assembly RH connector.
(b) Disconnect the G15 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition |
Specified Condition |
A44-2 (B) - G15-7 (LR) |
Always | Below 1 Ω |
A44-7 (E) - Body ground |
Always | Below 1 Ω |
NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
| |
23. |
CHECK HEADLIGHT ASSEMBLY RH |
(a) Connect the G15 combination meter assembly connector.
(b) Interchange the headlight assembly RH with LH and connect the connectors.
Click here
(c) Check that the front turn signal light operates normally.
OK:
Front turn signal light blinks.
OK |
| REPLACE HEADLIGHT ASSEMBLY RH |
NG |
| REPLACE COMBINATION METER ASSEMBLY |
(a) Choose the model to be inspected.
Result | Proceed to |
w/ Cornering Light | A |
w/o Cornering Light | B |
B |
| GO TO STEP 31 |
A |
| |
25. |
CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the P9 rear combination light assembly RH connector.
(b) Disconnect the G15 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition |
Specified Condition |
P9-3 (TRN) - G15-13 (TRNR) |
Always | Below 1 Ω |
P9-4 (E) - Body ground |
Always | Below 1 Ω |
NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
| |
26. |
CHECK REAR COMBINATION LIGHT SOCKET AND WIRE RH |
(a) Connect the G15 combination meter assembly connector.
(b) Interchange the rear combination light socket and wire RH with LH and connect the connectors.
Click here
(c) Check that the rear turn signal light operates normally.
OK:
Rear turn signal light blinks.
OK |
| REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE RH |
NG |
| |
27. |
INSPECT REAR COMBINATION LIGHT ASSEMBLY RH |
(a) Remove the rear combination light assembly RH.
Click here
(b) Inspect the rear combination light assembly RH.
Click here
NG |
| REPLACE REAR COMBINATION LIGHT ASSEMBLY RH |
OK |
| |
28. |
CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the P11 rear light assembly RH connector.
(b) Disconnect the G15 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition |
Specified Condition |
P11-3 (B) - G15-13 (TRNR) |
Always | Below 1 Ω |
P11-4 (E) - Body ground |
Always | Below 1 Ω |
NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
| |
29. |
CHECK REAR LIGHT CORD RH |
(a) Connect the G15 combination meter assembly connector.
(b) Interchange the rear light cord RH with LH and connect the connectors.
Click here
(c) Check that the rear turn signal light operates normally.
OK:
Rear turn signal light blinks.
OK |
| REPLACE REAR LIGHT CORD RH |
NG |
| |
30. |
INSPECT REAR LIGHT ASSEMBLY RH |
(a) Remove the rear light assembly RH.
Click here
(b) Inspect the rear light assembly RH.
Click here
OK |
| REPLACE COMBINATION METER ASSEMBLY |
NG |
| REPLACE REAR LIGHT ASSEMBLY RH |
31. |
CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) |
(a) Disconnect the P9 rear combination light assembly RH connector.
(b) Disconnect the G15 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition |
Specified Condition |
P9-3 (TRN) - G15-13 (TRNR) |
Always | Below 1 Ω |
P9-4 (E) - Body ground |
Always | Below 1 Ω |
NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
| |
32. |
CHECK REAR COMBINATION LIGHT SOCKET AND WIRE RH |
(a) Connect the G15 combination meter assembly connector.
(b) Interchange the rear combination light socket and wire RH with LH and connect the connectors.
Click here
(c) Check that the rear turn signal light operates normally.
OK:
Rear turn signal light blinks.
OK |
| REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE RH |
NG |
| |
33. |
INSPECT REAR COMBINATION LIGHT ASSEMBLY RH |
(a) Remove the rear combination light assembly RH.
Click here
(b) Inspect the rear combination light assembly RH.
Click here
OK |
| REPLACE COMBINATION METER ASSEMBLY |
NG |
| REPLACE REAR COMBINATION LIGHT ASSEMBLY RH |