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

Toyota Tacoma (2015-2018) Service Manual / Meter / Gauge / Display / Meter / Gauge System / 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: 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: 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

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

GO TO STEP 3

GO TO STEP 4

GO TO STEP 5

GO TO STEP 6

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

REPLACE COMBINATION METER ASSEMBLY

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.

(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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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.

(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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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.

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

REPLACE COMBINATION METER ASSEMBLY

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

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

REPLACE COMBINATION METER ASSEMBLY

REPLACE DRIVER SIDE JUNCTION BLOCK

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