Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: 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 )

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

B

GO TO STEP 9

A

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.

B

GO TO STEP 7

A

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.

(c) Disconnect the S15 and S16 front No. 1 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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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)

NG

REPLACE FRONT NO. 1 SPEAKER ASSEMBLY

OK

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.
OK

END

NG

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)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

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.

B

GO TO STEP 12

C

GO TO STEP 14

D

GO TO STEP 16

A

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE REAR SPEAKER ASSEMBLY

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