Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Turn Signal Light Circuit Current Below Threshold (B150718)

Toyota Corolla Cross (2022-2024) 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
    • Front turn signal light socket*1
    • Front turn signal light bulb*1
  • Rear combination light assembly
  • Harness or connector
  • Combination meter assembly
  • *1: for Bulb Type Clearance Light

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.
  • When replacing the combination meter assembly, update the ECU security key

    Click here

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 7

C

GO TO STEP 9

D

GO TO STEP 14

A

2.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

for Bulb Type Clearance Light

A

for LED Type Clearance Light

B
B

GO TO STEP 5

A

3.

CHECK LH SIDE FRONT TURN SIGNAL LIGHT (FRONT TURN SIGNAL LIGHT SOCKET)

(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 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

REPLACE FRONT TURN SIGNAL LIGHT SOCKET

B

4.

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

(a) Disconnect the A141 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

A141-1 (B) - I5-5 (LL)

Always

Below 1 Ω

A141-2 (E) - Body ground

Always

Below 1 Ω
OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

CHECK LH SIDE FRONT TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY)

(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 assembiy 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

REPLACE HEADLIGHT ASSEMBLY LH

B

6.

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

(a) Disconnect the A133 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

A133-2 (B) - I5-5 (LL)

Always

Below 1 Ω

A133-1 (E) - Body ground

Always

Below 1 Ω
OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

CHECK LH SIDE REAR TURN SIGNAL LIGHT (REAR COMBINATION LIGHT ASSEMBLY)

(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 light operates normally, the rear turn signal light socket is malfunctioning.

Result

Proceed to

LH side rear turn signal light operates normally

A

Problem symptoms do not change

(LH side rear turn signal light does not blink)

B
A

REPLACE COMBINATION LIGHT ASSEMBLY LH

B

8.

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

(a) Disconnect the S14 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

S14-4 (B) - I5-22 (TRNL)

Always

Below 1 Ω

S14-3 (E) - Body ground

Always

Below 1 Ω
OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

for Bulb Type Clearance Light

A

for LED Type Clearance Light

B
B

GO TO STEP 12

A

10.

CHECK RH SIDE FRONT TURN SIGNAL LIGHT (FRONT TURN SIGNAL LIGHT SOCKET)

(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 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

REPLACE FRONT TURN SIGNAL LIGHT SOCKET

B

11.

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

(a) Disconnect the A146 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

A146-1 (B) - I5-6 (LR)

Always

Below 1 Ω

A146-2 (E) - Body ground

Always

Below 1 Ω
OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.

CHECK RH SIDE FRONT TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY)

(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 assembiy 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

REPLACE HEADLIGHT ASSEMBLY RH

B

13.

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

(a) Disconnect the A136 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

A136-2 (B) - I5-6 (LR)

Always

Below 1 Ω

A136-1 (E) - Body ground

Always

Below 1 Ω
OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.

CHECK RH SIDE REAR TURN SIGNAL LIGHT (REAR COMBINATION LIGHT ASSEMBLY)

(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 light operates normally, the rear turn signal light socket is malfunctioning.

Result

Proceed to

RH side rear turn signal light operates normally

A

Problem symptoms do not change

(RH side rear turn signal light does not blink)

B
A

REPLACE COMBINATION LIGHT ASSEMBLY RH

B

15.

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

(a) Disconnect the S15 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

S15-4 (B) - I5-21 (TRNR)

Always

Below 1 Ω

S15-3 (E) - Body ground

Always

Below 1 Ω
OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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