Toyota Tacoma 2015-2018 Service Manual: Speaker Output Short (B15C3)

Toyota Tacoma 2015-2018 Service Manual / Audio / Video / Audio And Visual System / Speaker Output Short (B15C3)

DESCRIPTION

This DTC is stored when a malfunction occurs in the speakers.

DTC No.	DTC Detection Condition	Trouble Area
B15C3	A short is detected in the speaker output circuit.	Harness or connector Speaker Radio and display receiver assembly

WIRING DIAGRAM

PROCEDURE

1.	CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Result	Proceed to
for 6 Speakers	A
for 4 Speakers	B

GO TO STEP 8

2.	CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - BODY GROUND)

(a) Disconnect the R30 and R29 radio and display receiver assembly connectors.

(b) Disconnect the S46 and S47 front No. 2 speaker assembly connectors.

(d) Measure the resistance between the radio and display receiver assembly and body ground to check for a short circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
R30-1 (FR+) - Body ground	Always	10 kΩ or higher
R30-5 (FR-) - Body ground	Always	10 kΩ or higher
R30-2 (FL+) - Body ground	Always	10 kΩ or higher
R30-6 (FL-) - Body ground	Always	10 kΩ or higher
R29-1 (RR+) - Body ground	Always	10 kΩ or higher
R29-3 (RR-) - Body ground	Always	10 kΩ or higher
R29-2 (RL+) - Body ground	Always	10 kΩ or higher
R29-6 (RL-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (FRONT NO. 2 SPEAKER ASSEMBLY - BODY GROUND)

(a) Disconnect the S15 and S16 front No. 1 speaker assembly connectors.

(b) Disconnect the S46 and S47 front No. 2 speaker assembly connectors.

(c) Measure the resistance between each of the front No. 2 speaker assemblies and body ground to check for a short circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
S47-1 (+) - Body ground	Always	10 kΩ or higher
S47-3 (-) - Body ground	Always	10 kΩ or higher
S46-1 (+) - Body ground	Always	10 kΩ or higher
S46-3 (-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

(a) Remove the front No. 1 speaker assembly (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 - 2	Always	3.2 to 4.8 Ω

Text in Illustration

*a	Component without harness connected (Front No. 1 Speaker Assembly)

REPLACE FRONT NO. 1 SPEAKER ASSEMBLY

5.	INSPECT FRONT NO. 2 SPEAKER ASSEMBLY

(a) Remove the front No. 2 speaker assembly (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
2 (+) - 4 (-)	Always	10 kΩ or higher
2 (+) - 1 (+)	Always	Below 1 Ω
4 (-) - 3 (-)	Always	Below 1 Ω

Text in Illustration

*a	Component without harness connected (Front No. 2 Speaker Assembly)

REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

6.	REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

(a) Replace the front No. 2 speaker assembly with a new or known good one (See page (b) Clear the DTCs (See page ). ).

(b) Clear the DTCs (See page (c) Recheck for DTCs and check that no DTCs are output. ).

OK:

No DTCs are output.

HINT:

Connect all the connectors to the front No. 2 speaker assemblies that were disconnected.
When there is a possibility that either the right or left front No. 2 speaker assembly is defective, inspect by interchanging the right one with the left one.
Perform the above inspection on both the LH and RH side.

END

7.	INSPECT REAR SPEAKER ASSEMBLY

(a) Remove the rear speaker assembly (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 - 2	Always	4 Ω

Text in Illustration

*a	Component without harness connected (Rear Speaker Assembly)

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

REPLACE REAR SPEAKER ASSEMBLY

8.	CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - BODY GROUND)

(a) Disconnect the R30 radio and display receiver assembly connector.

(b) Disconnect the S46 and S47 front No. 2 speaker assembly connectors.

(c) Measure the resistance between the radio and display receiver assembly and body ground to check for a short circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
R30-1 (FR+) - Body ground	Always	10 kΩ or higher
R30-5 (FR-) - Body ground	Always	10 kΩ or higher
R30-2 (FL+) - Body ground	Always	10 kΩ or higher
R30-6 (FL-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.	CHECK HARNESS AND CONNECTOR (FRONT NO. 2 SPEAKER ASSEMBLY - BODY GROUND)

(a) Disconnect the S15 and S16 front No. 1 speaker assembly connectors.

(b) Disconnect the S46 and S47 front No. 2 speaker assembly connectors.

(c) Measure the resistance between each of the front No. 2 speaker assemblies and body ground to check for a short circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
S46-1 (+) - Body ground	Always	10 kΩ or higher
S46-3 (-) - Body ground	Always	10 kΩ or higher
S47-1 (+) - Body ground	Always	10 kΩ or higher
S47-3 (-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

(a) Remove the front No. 1 speaker assembly (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 - 2	Always	3.2 to 4.8 Ω

Text in Illustration

*a	Component without harness connected (Front No. 1 Speaker Assembly)

REPLACE FRONT NO. 1 SPEAKER ASSEMBLY

11.	INSPECT FRONT NO. 2 SPEAKER ASSEMBLY

(a) Remove the front No. 2 speaker assembly (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
2 (+) - 4 (-)	Always	10 kΩ or higher
2 (+) - 1 (+)	Always	Below 1 Ω
4 (-) - 3 (-)	Always	Below 1 Ω

Text in Illustration

*a	Component without harness connected (Front No. 2 Speaker Assembly)

REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

12.	REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

(a) Replace the front No. 2 speaker assembly with a new or known good one (See page (b) Clear the DTCs (See page ). ).

(b) Clear the DTCs (See page (c) Recheck for DTCs and check that no DTCs are output. ).

OK:

No DTCs are output.

HINT:

Connect all the connectors to the front No. 2 speaker assemblies that were disconnected.
When there is a possibility that either the right or left front No. 2 speaker assembly is defective, inspect by interchanging the right one with the left one.
Perform the above inspection on both the LH and RH side.

END

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

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