Toyota Tacoma (2015-2018) Service Manual: Speaker Circuit

Toyota Tacoma (2015-2018) Service Manual / Navigation / Multi Info Display / Navigation System / Speaker Circuit

DESCRIPTION

If there is a short in a speaker circuit, the stereo component amplifier assembly*1 or navigation receiver assembly*2 detects it and stops output to the speakers.

Thus sound cannot be heard from the speakers even if there is no malfunction in the stereo component amplifier assembly*1 or navigation receiver assembly*2 or speakers.

If a short is detected in a speaker circuit, no sound can be heard from the speakers.

*1: w/ Stereo Component Amplifier

*2: w/o Stereo Component Amplifier

WIRING DIAGRAM

(See page PROCEDURE )

PROCEDURE

1.	CONFIRM MODEL

(a) Choose the model to be inspected.

Result

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

GO TO STEP 9

2.	CHECK SPEAKER (OPERATION CHECK)

(a) Enter the "System Check Mode" screen.

Refer to Check Speaker in Operation Check (See page ).

(b) Perform the operation check above and determine the speaker that is not operating.

Result

Not Operating Speaker	Proceed to
Front No. 1 speaker assembly or front No. 2 speaker assembly	A
Rear speaker assembly	B

HINT:

If sound cannot be heard from any speaker, inspect all of them.

GO TO STEP 7

3.	CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - FRONT NO. 2 SPEAKER ASSEMBLY - FRONT NO. 1 SPEAKER ASSEMBLY)

(a) Disconnect the N24 navigation receiver assembly connector.

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

(d) Measure the resistance between the navigation receiver assembly and each of the front No. 2 speaker assemblies to check for an open circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
N24-1 (FR+) - S47-2 (+)	Always	Below 1 Ω
N24-5 (FR-) - S47-4 (-)	Always	Below 1 Ω
N24-2 (FL+) - S46-2 (+)	Always	Below 1 Ω
N24-6 (FL-) - S46-4 (-)	Always	Below 1 Ω

(e) Measure the resistance between each of the front No. 2 speaker assemblies and the front No. 1 speaker assemblies to check for an open circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
S46-1 (+) - S15-1	Always	Below 1 Ω
S46-3 (-) - S15-2	Always	Below 1 Ω
S47-1 (+) - S16-1	Always	Below 1 Ω
S47-3 (-) - S16-2	Always	Below 1 Ω

(f) Measure the resistance between the navigation receiver assembly and body ground 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

(g) 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

4.	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
4 (+) - 2 (-)	Always	10 kΩ or higher
1 (+) - 2 (+)	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. 1 SPEAKER ASSEMBLY

5.	REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

(a) Check that the malfunction disappears when a known good speaker is installed (See page OK: ).

OK:

Malfunction disappears.

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

6.	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)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE FRONT NO. 1 SPEAKER ASSEMBLY

7.	CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - REAR SPEAKER ASSEMBLY)

(a) Disconnect the N23 navigation receiver assembly connector.

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

(c) Measure the resistance between the navigation receiver assembly and each of the rear speaker assemblies to check for an open circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
N23-1 (RR+) - S18-1	Always	Below 1 Ω
N23-3 (RR-) - S18-2	Always	Below 1 Ω
N23-2 (RL+) - S17-1	Always	Below 1 Ω
N23-6 (RL-) - S17-2	Always	Below 1 Ω

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
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.	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)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE REAR SPEAKER ASSEMBLY

9.	CHECK SPEAKER (OPERATION CHECK)

(a) Enter the "System Check Mode" screen.

Refer to Check Speaker in Operation Check (See page ).

(b) Perform the operation check above and determine the speaker that is not operating.

Result

Not Operating Speaker	Proceed to
Front No. 1 speaker assembly	A
Front No. 2 speaker assembly	B
No. 1 speaker assembly with box	C
Rear speaker assembly	D

HINT:

If sound cannot be heard from any speaker, inspect all of them.

GO TO STEP 12

GO TO STEP 14

GO TO STEP 16

10.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - FRONT NO. 1 SPEAKER ASSEMBLY)

(a) Disconnect the S24 stereo component amplifier assembly connector.

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

(c) Measure the resistance between the stereo component amplifier assembly and each of the front No. 1 speaker assemblies to check for an open circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
S24-9 (FR+) - S16-1	Always	Below 1 Ω
S24-3 (FR-) - S16-2	Always	Below 1 Ω
S24-2 (FL+) - S15-1	Always	Below 1 Ω
S24-1 (FL-) - S15-2	Always	Below 1 Ω

(d) 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
S24-9 (FR+) - Body ground	Always	10 kΩ or higher
S24-3 (FR-) - Body ground	Always	10 kΩ or higher
S24-2 (FL+) - Body ground	Always	10 kΩ or higher
S24-1 (FL-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.	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)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE FRONT NO. 1 SPEAKER ASSEMBLY

12.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - FRONT NO. 2 SPEAKER ASSEMBLY)

(a) Disconnect the S31 stereo component amplifier assembly connector.

(b) Disconnect the S48 and S49 front No. 2 speaker assembly connectors.

(c) Measure the resistance between the stereo component amplifier assembly and each of the front No. 2 speaker assemblies to check for an open circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
S31-2 (TWR+) - S49-2	Always	Below 1 Ω
S31-6 (TWR-) - S49-1	Always	Below 1 Ω
S31-8 (TWL+) - S48-2	Always	Below 1 Ω
S31-7 (TWL-) - S48-1	Always	Below 1 Ω

(d) 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
S31-2 (TWR+) - Body ground	Always	10 kΩ or higher
S31-6 (TWR-) - 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

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.	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
1 - 2	Always	1.5 to 2.5 Ω

Text in Illustration

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

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE FRONT NO. 1 SPEAKER ASSEMBLY

14.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - NO. 1 SPEAKER ASSEMBLY WITH BOX)

(a) Disconnect the S24 stereo component amplifier assembly connector.

(b) Disconnect the S21 No. 1 speaker assembly with box connectors.

(c) Measure the resistance between the stereo component amplifier assembly and each of the No. 1 speaker assembly with box to check for an open circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
S24-4 (WFR+) - S21-1 (WF+)	Always	Below 1 Ω
S24-10 (WFR-) - S21-4 (WF-)	Always	Below 1 Ω
S24-5 (WFL+) - S21-2 (WF+)	Always	Below 1 Ω
S24-12 (WFL-) - S21-3 (WF-)	Always	Below 1 Ω

(d) 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
S21-2 (WF+) - Body ground	Always	10 kΩ or higher
S21-3 (WF-) - Body ground	Always	10 kΩ or higher
S21-1 (WF+) - Body ground	Always	10 kΩ or higher
S21-4 (WF-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

15.	INSPECT NO. 1 SPEAKER ASSEMBLY WITH BOX

(a) Remove the rear No. 1 speaker assembly with box (See page ).

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

Standard Resistance:

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

Text in Illustration

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

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE NO.1 SPEAKER ASSEMBLY WITH BOX

16.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - REAR SPEAKER ASSEMBLY)

(a) Disconnect the S31 stereo component amplifier assembly connector.

(b) Disconnect the S17 and S18 rear speaker assembly connector.

(c) Measure the resistance between the stereo component amplifier assembly and the rear speaker assembly to check for an open circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
S31-3 (RL+) - S17-1	Always	Below 1 Ω
S31-9 (RL-) - S17-2	Always	Below 1 Ω
S31-10 (RR+) - S18-1	Always	Below 1 Ω
S31-4 (RR-) - S18-2	Always	Below 1 Ω

(d) 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
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

REPAIR OR REPLACE HARNESS OR CONNECTOR

17.	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)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE REAR SPEAKER ASSEMBLY

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