Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Open in Turn Signal Circuit (B1507,B1508)

DESCRIPTION

This DTC is stored when the combination meter assembly detects an open in a turn signal light circuit, a short in a turn signal light circuit, or a short in the hazard warning light circuit.

DTC No.

DTC Detection Condition

Trouble Area

B1507

When IG voltage is 9.5 V or more and the following condition is detected:

  1. Open in turn signal light circuit*
  • Harness or connector
  • Bulb
  • Instrument panel junction block assembly
  • Combination meter assembly

B1508

When IG voltage is more than 7 V and the following condition is detected:

  1. Short in turn signal light circuit or hazard warning light circuit
  • Harness or connector
  • Bulb
  • Instrument panel junction block assembly
  • Combination meter assembly
  • *: except Trailer Towing System

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION / NOTICE / HINT

NOTICE:

Inspect the bulbs for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

INSPECT LIGHTS

(a) Inspect the illumination of each turn signal light.

Result

Result

Proceed to

Turn signal lights for one side do not illuminate (except Front Turn Signal Light)

A

Front turn signal light does not illuminate

B

Rear turn signal light does not illuminate

C

Side turn signal light does not illuminate (for Outer Rear View Mirror Type Side Turn Signal Light)

D

Trailer turn signal light does not illuminate (w/ Trail Towing System

E

B

GO TO STEP 3

C

GO TO STEP 4

D

GO TO STEP 5

E

GO TO STEP 6

A

2.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - DRIVER SIDE JUNCTION BLOCK)

(a) Disconnect the C10 combination meter assembly connector.

(b) Disconnect the 1A driver side junction block connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C10-5 (RLT) - 1A-3

Always

Below 1 Ω

C10-5 (RLT) or 1A-3 - Body ground

Always

10 kΩ or higher

C10-3 (RRT) - 1A-2

Always

Below 1 Ω

C10-3 (RRT) or 1A-2 - Body ground

Always

10 kΩ or higher

Result

Result

Proceed to

NG

A

OK

B

A

REPAIR OR REPLACE HARNESS OR CONNECTOR

B

GO TO STEP 7

3.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - COMBINATION METER ASSEMBLY)

(a) for DRL LED Type:

(1) Disconnect the H14 headlight assembly LH connectors.

(2) Disconnect the H15 headlight assembly RH connectors.

(3) Disconnect the C10 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H14-1 (B) - C10-9 (LL)

Always

Below 1 Ω

H14-2 (E) - Body ground

Always

Below 1 Ω

H14-1 (B) or C10-9 (LL) - Body ground

Always

10 kΩ or higher

H15-1 (B) - C10-10 (LR)

Always

Below 1 Ω

H15-2 (E) - Body ground

Always

Below 1 Ω

H15-1 (B) or C10-10 (LR) - Body ground

Always

10 kΩ or higher

(b) for DRL Bulb Type:

(1) Disconnect the H8 headlight assembly LH connectors.

(2) Disconnect the H9 headlight assembly RH connectors.

(3) Disconnect the C10 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H8-1 (B) - C10-9 (LL)

Always

Below 1 Ω

H8-2 (E) - Body ground

Always

Below 1 Ω

H8-1 (B) or C10-9 (LL) - Body ground

Always

10 kΩ or higher

H9-1 (B) - C10-10 (LR)

Always

Below 1 Ω

H9-2 (E) - Body ground

Always

Below 1 Ω

H9-1 (B) or C10-10 (LR) - Body ground

Always

10 kΩ or higher

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY - DRIVER SIDE JUNCTION BLOCK)

(a) Disconnect the R5 rear combination light assembly LH connector.

(b) Disconnect the R6 rear combination light assembly RH connector.

(c) Disconnect the 1F driver side junction block connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

R5-1 - 1F-6

Always

Below 1 Ω

R5-3 - Body ground

Always

Below 1 Ω

R5-1 or 1F-6 - Body ground

Always

10 kΩ or higher

R6-1 - 1F-7

Always

Below 1 Ω

R6-1 - Body ground

Always

Below 1 Ω

R6-1 or 1F-7 - Body ground

Always

10 kΩ or higher

Result

Result

Proceed to

NG

A

OK

B

A

REPAIR OR REPLACE HARNESS OR CONNECTOR

B

GO TO STEP 7

5.

CHECK HARNESS AND CONNECTOR (OUTER REAR VIEW MIRROR ASSEMBLY - DRIVER SIDE JUNCTION BLOCK)

(a) Disconnect the O2 outer rear view mirror assembly LH connector.

(b) Disconnect the O3 outer rear view mirror assembly RH connector.

(c) Disconnect the 1A driver side junction block connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O2-10 - 1A-19

Always

Below 1 Ω

O2-11 - Body ground

Always

Below 1 Ω

O2-10 or 1A-19 - Body ground

Always

10 kΩ or higher

O3-10 - 1A-17

Always

Below 1 Ω

O3-11 - Body ground

Always

Below 1 Ω

O3-10 or 1A-17 - Body ground

Always

10 kΩ or higher

Result

Result

Proceed to

NG

A

OK

B

A

REPAIR OR REPLACE HARNESS OR CONNECTOR

B

GO TO STEP 7

6.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - TRAILER SOCKET)

(a) Disconnect the C10 combination meter assembly connector.

(b) Disconnect the T12 trailer socket connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C10-11(TLT) - T12-1(STTL)

Always

Below 1 Ω

C10-12(TRT) - T12-4(STTR)

Always

Below 1 Ω

C10-11(TLT) or T12-1(STTL) - Body ground

Always

10 kΩ or higher

C10-12(TRT) or T12-4(STTR) - Body ground

Always

10 kΩ or higher

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

INSPECT DRIVER SIDE JUNCTION BLOCK

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly (See page Text in Illustration ).

Text in Illustration

*a

Component without harness connected

(Driver Side Junction Block)

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1A-3 - 1F-6

Always

Below 1 Ω

1A-3 - 1A-19*1

Always

Below 1 Ω

1A-2 - 1F-7

Always

Below 1 Ω

1A-2 - 1A-17*1

Always

Below 1 Ω

  • *1: for Outer Rear View Mirror Type Side Turn Signal Light
OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPLACE DRIVER SIDE JUNCTION BLOCK

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