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

Toyota Tacoma (2015-2018) Service Manual / Navigation / Multi Info Display / Navigation 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 Stereo component amplifier assembly (w/ Stereo Component Amplifier) Navigation receiver assembly (w/o Stereo Component Amplifier)

WIRING DIAGRAM

PROCEDURE

1.	CHECK VEHICLE CONDITION

(a) Check vehicle condition.

Result

Result	Proceed to
w/ Stereo Component Amplifier	A
w/o Stereo Component Amplifier	B

GO TO STEP 7

2.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - BODY GROUND)

(a) Disconnect the S24 and S31 stereo component amplifier assembly connectors.

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

(d) Disconnect the S17 and S18 rear speaker assembly connectors.

(e) Disconnect the S21 No. 1 speaker assembly with box connector.

(f) Measure the resistance between the stereo component amplifier assembly and body ground to check for a short circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
S24-2 (FL+) - Body ground	Always	10 kΩ or higher
S24-1 (FL-) - Body ground	Always	10 kΩ or higher
S24-9 (FR+) - Body ground	Always	10 kΩ or higher
S24-3 (FR-) - Body ground	Always	10 kΩ or higher
S31-8 (TWL+) - Body ground	Always	10 kΩ or higher
S31-7 (TWL-) - Body ground	Always	10 kΩ or higher
S31-2 (TWR+) - Body ground	Always	10 kΩ or higher
S31-6 (TWR-) - Body ground	Always	10 kΩ or higher
S31-3 (RL+) - Body ground	Always	10 kΩ or higher
S31-9 (RL-) - Body ground	Always	10 kΩ or higher
S31-10 (RR+) - Body ground	Always	10 kΩ or higher
S31-4 (RR-) - Body ground	Always	10 kΩ or higher
S24-5 (WFL+) - Body ground	Always	10 kΩ or higher
S24-12 (WFL-) - Body ground	Always	10 kΩ or higher
S24-4 (WFR+) - Body ground	Always	10 kΩ or higher
S24-10 (WFR-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

(a) Remove 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 4.8Ω

Text in Illustration

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT FRONT NO. 2 SPEAKER ASSEMBLY

(a) Remove 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
1 - 2	Always	1.5 to 2.5 Ω

Text in Illustration

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

REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

5.	INSPECT REAR SPEAKER ASSEMBLY

(a) Disconnect the S17 and S18 rear speaker assembly connectors.

(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 REAR SPEAKER ASSEMBLY

6.	INSPECT NO. 1 SPEAKER ASSEMBLY WITH BOX

(a) Disconnect the S21 No. 1 speaker assembly with box connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
2 (WF+) - 4 (WF-)	Always	1.6 to 2.4 Ω
1 (WF+) - 3 (WF-)	Always	1.6 to 2.4 Ω

Text in Illustration

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

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

REPLACE NO. 1 SPEAKER ASSEMBLY WITH BOX

7.	CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - BODY GROUND)

(a) Disconnect the N23 and N24 navigation receiver assembly connectors.

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

(d) Measure the resistance between the navigation receiver assembly to check for a short circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
N24-1 (FR+) - Body ground	Always	10 kΩ or higher
N24-5 (FR-) - Body ground	Always	10 kΩ or higher
N24-2 (FL+) - Body ground	Always	10 kΩ or higher
N24-6 (FL-) - Body ground	Always	10 kΩ or higher
N23-1 (RR+) - Body ground	Always	10 kΩ or higher
N23-3 (RR-) - Body ground	Always	10 kΩ or higher
N23-2 (RL+) - Body ground	Always	10 kΩ or higher
N23-6 (RL-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	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

9.	INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

(a) Remove 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

10.	INSPECT FRONT NO. 2 SPEAKER ASSEMBLY

(a) Remove 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

11.	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

12.	INSPECT REAR SPEAKER ASSEMBLY

(a) Remove 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 NAVIGATION RECEIVER ASSEMBLY

REPLACE REAR SPEAKER ASSEMBLY

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