Toyota Tacoma 2015-2018 Service Manual: Speaker Circuit

Toyota Tacoma 2015-2018 Service Manual / Audio / Video / Audio And Visual System / Speaker Circuit

DESCRIPTION

If there is a short in a speaker circuit, the radio and display receiver assembly detects it and stops output to the speakers.
Thus sound cannot be heard from the speakers even if there is no malfunction in the radio and display receiver assembly or speakers.
If a short is detected in a speaker circuit, no sound can be heard from the speakers.

WIRING DIAGRAM

(See page PROCEDURE ).

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 9

2.	CHECK SPEAKER

(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 (RADIO AND DISPLAY RECEIVER ASSEMBLY - FRONT NO. 2 SPEAKER ASSEMBLY - FRONT NO. 1 SPEAKER ASSEMBLY)

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

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

(d) Measure the resistance between the radio and display 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
R30-1 (FR+) - S47-2 (+)	Always	Below 1 Ω
R30-5 (FR-) - S47-4 (-)	Always	Below 1 Ω
R30-2 (FL+) - S46-2 (+)	Always	Below 1 Ω
R30-6 (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
S47-1 (+) - S16-1	Always	Below 1 Ω
S47-3 (-) - S16-2	Always	Below 1 Ω
S46-1 (+) - S15-1	Always	Below 1 Ω
S46-3 (-) - S15-2	Always	Below 1 Ω

(f) 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

(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
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.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
2 (+) - 1 (+)	Always	Below 1 Ω
4 (-) - 3 (-)	Always	Below 1 Ω
3 (-) - 1 (+)	Always	10 kΩ or higher

Text in Illustration

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

REPLACE FRONT NO.2 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 (RADIO AND DISPLAY RECEIVER ASSEMBLY - REAR SPEAKER ASSEMBLY)

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

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

(c) Measure the resistance between the radio and display 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
R29-1 (RR+) - S18-1	Always	Below 1 Ω
R29-3 (RR-) - S18-2	Always	Below 1 Ω
R29-2 (RL+) - S17-1	Always	Below 1 Ω
R29-1 (RL-) - S17-2	Always	Below 1 Ω

(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
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

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 HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - FRONT NO. 2 SPEAKER ASSEMBLY - FRONT NO. 1 SPEAKER ASSEMBLY)

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

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

(d) Measure the resistance between the radio and display 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
R30-1 (FR+) - S47-2 (+)	Always	Below 1 Ω
R30-5 (FR-) - S47-4 (-)	Always	Below 1 Ω
R30-2 (FL+) - S46-2 (+)	Always	Below 1 Ω
R30-6 (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
S47-1 (+) - S16-1	Always	Below 1 Ω
S47-3 (-) - S16-2	Always	Below 1 Ω
S46-1 (+) - S15-1	Always	Below 1 Ω
S46-3 (-) - S15-2	Always	Below 1 Ω

(f) 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

(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
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

10.	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
2 (+) - 1 (+)	Always	Below 1 Ω
4 (-) - 3 (-)	Always	Below 1 Ω
3 (-) - 2(+)	Always	10 kΩ or higher

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) 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

12.	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

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