Toyota Yaris: Meter / Gauge System / Turn Signal Light Circuit Current Below Threshold (B150718)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Meter / Gauge / Display / Meter / Gauge System / 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

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
  • Headlight assembly
    • Headlight unit assembly LH
    • Headlight unit assembly RH
    • Wire Harness LH
    • Wire Harness RH
  • Rear combination light assembly
    • Rear turn signal light LED
  • Harness or connector
  • Combination meter assembly

WIRING DIAGRAM

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.

PROCEDURE

1.

CHECK SYMPTOMS

(a) Check the problem symptoms.

Result

Proceed to

LH side front turn signal light does not blink

A

LH side rear turn signal light does not blink

B

RH side front turn signal light does not blink

C

RH side rear turn signal light does not blink

D
B

GO TO STEP 5

C

GO TO STEP 7

D

GO TO STEP 10

A

2.

CHECK LH SIDE FRONT TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY LH)

Pre-procedure1

(a) Interchange the headlight assembly LH with RH and connect the connectors.

HINT:

Click here

Procedure1

(b) Operate the turn signal switch and check that the LH side front turn signal light operates normally.

HINT:

If the RH side front turn signal light operates normally, the headlight assembly LH is malfunctioning.

Post-procedure1

(c) None

Result

Proceed to

LH side front turn signal light operates normally

A

LH side front turn signal light does not blink

B
B

GO TO STEP 4

A

3.

CHECK LH SIDE FRONT TURN SIGNAL LIGHT (WIRE HARNESS)

(a) Interchange the wire harness LH with RH and connect the connectors.

HINT:

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 wire harness is malfunctioning.

Result

Proceed to

LH side front turn signal light operates normally

A

LH side front turn signal light does not blink

B
A

REPLACE WIRE HARNESS LH

B

REPLACE HEADLIGHT UNIT ASSEMBLY LH

4.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND)

Pre-procedure1

(a) Disconnect the A4 headlight assembly LH connector.

(b) Disconnect the H7 combination meter assembly connector.

Procedure1

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A4-6 (B) - H7-1 (LL)

Always

Below 1 Ω

A4-5 (E) - Body ground

Always

Below 1 Ω

Post-procedure1

(d) None

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

CHECK LH SIDE REAR TURN SIGNAL LIGHT (REAR TURN SIGNAL LIGHT LED)

Pre-procedure1

(a) Interchange the rear turn signal light LED LH with RH and connect the connectors.

HINT:

Click here

Procedure1

(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 turn signal light LED is malfunctioning.

Post-procedure1

(c) None

Result

Proceed to

LH side rear turn signal lights operates normally

A

LH side rear turn signal light does not blink

B
A

REPLACE REAR TURN SIGNAL LIGHT LED

B

6.

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

Pre-procedure1

(a) Disconnect the O105 rear combination light assembly LH connector.

(b) Disconnect the H7 combination meter assembly connector.

Procedure1

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O105-2 (B) - H7-5 (TRNL)

Always

Below 1 Ω

O105-1 (E) - Body ground

Always

Below 1 Ω

Pre-procedure1

(d) None

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

CHECK RH SIDE FRONT TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY RH)

Pre-procedure1

(a) Interchange the headlight assembly RH with LH and connect the connectors.

HINT:

Click here

Procedure1

(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.

Post-procedure1

(c) None

Result

Proceed to

RH side front turn signal light operates normally

A

RH side front turn signal light does not blink

B
B

GO TO STEP 9

A

8.

CHECK RH SIDE FRONT TURN SIGNAL LIGHT (WIRE HARNESS)

Pre-procedure1

(a) Interchange the wire harness RH with LH and connect the connectors.

HINT:

Click here

Procedure1

(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 wire harness RH is malfunctioning.

Post-procedure1

(c) None

Result

Proceed to

RH side front turn signal light operates normally

A

RH side front turn signal light does not blink

B
A

REPLACE WIRE HARNESS RH

B

REPLACE HEADLIGHT UNIT ASSEMBLY RH

9.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND)

Pre-procedure1

(a) Disconnect the A5 headlight assembly RH connector.

(b) Disconnect the H7 combination meter assembly connector.

Procedure1

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A5-6 (B) - H7-2 (LR)

Always

Below 1 Ω

A5-5 (E) - Body ground

Always

Below 1 Ω

Post-procedure1

(d) None

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.

CHECK RH SIDE REAR TURN SIGNAL LIGHT (REAR TURN SIGNAL LIGHT LED)

Pre-procedure1

(a) Interchange the rear turn signal light LED RH with LH and connect the connectors.

HINT:

Click here

Procedure1

(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 turn signal light LED is malfunctioning.

Post-procedure1

(c) None

Result

Proceed to

RH side rear turn signal lights operates normally

A

RH side rear turn signal light does not blink

B
A

REPLACE REAR TURN SIGNAL LIGHT LED

B

11.

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

Pre-procedure1

(a) Disconnect the O106 rear combination light assembly RH connector.

(b) Disconnect the H7 combination meter assembly connector.

Procedure1

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O106-2 (B) - H7-6 (TRNR)

Always

Below 1 Ω

O106-1 (E) - Body ground

Always

Below 1 Ω

Post-procedure1

(d) None

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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