Toyota 4Runner: Speaker Circuit

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Navigation / Multi Info Display / Navigation System / Speaker Circuit

DESCRIPTION

If there is a short in a speaker circuit, the stereo component amplifier 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 stereo component amplifier assembly, DCM (telematics transceiver)*1 or speakers.
If a short is detected in a speaker circuit, no sound can be heard from the speakers.

*1: w/ Manual (SOS) Switch

WIRING DIAGRAM

1. for 9 Speakers

2. for 8 Speakers

PROCEDURE

1.	CONFIRM MODEL

(a) Choose the model to be inspected.

Model	Proceed to
for 9 Speakers	A
for 8 Speakers	B

GO TO STEP 9

2.	CHECK HARNESS AND CONNECTOR (for 9 Speakers)

(a) Disconnect the connectors from the N12 and N13 stereo component amplifier assembly, F39 DCM (telematics transceiver)*1 and speakers.

*1: w/ Manual (SOS) Switch

(b) w/ Manual (SOS) Switch

(1) Measure the resistance between the stereo component amplifier assembly and the DCM (telematics transceiver) to check for an open circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
N12-10 (FR+) - F39-2 (SPI+)	Always	Below 1 Ω
N12-9 (FR-) - F39-3 (SPI-)	Always	Below 1 Ω

(2) Measure the resistance between the front No. 1 speaker assembly RH and the DCM (telematics transceiver) to check for an open circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
H1-1 - F39-5 (SPO+)	Always	Below 1 Ω
H1-2 - F39-6 (SPO-)	Always	Below 1 Ω

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
N12-10 (FR+) - H1-1	Always	Below 1 Ω
N12-9 (FR-) - H1-2	Always	Below 1 Ω

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
N12-3 (FL+) - I1-1	Always	Below 1 Ω
N12-8 (FL-) - I1-2	Always	Below 1 Ω

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
N12-2 (TWR+) - G22-4	Always	Below 1 Ω
N12-7 (TWR-) - G22-3	Always	Below 1 Ω
N12-1 (TWL+) - G15-4	Always	Below 1 Ω
N12-6 (TWL-) - G15-3	Always	Below 1 Ω

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
N12-5 (RR+) - J1-1	Always	Below 1 Ω
N12-12 (RR-) - J1-2	Always	Below 1 Ω
N12-4 (RL+) - K1-1	Always	Below 1 Ω
N12-11 (RL-) - K1-2	Always	Below 1 Ω

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
N13-4 (R-R+) - W5-1	Always	Below 1 Ω
N13-10 (R-R-) - W5-2	Always	Below 1 Ω
N13-3 (R-L+) - W6-1	Always	Below 1 Ω
N13-9 (R-L-) - W6-2	Always	Below 1 Ω

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
N13-1 (WF2+) - N15-2 (WF2+)	Always	Below 1 Ω
N13-5 (WF2-) - N15-4 (WF2-)	Always	Below 1 Ω
N13-2 (WF1+) - N15-1 (WF1+)	Always	Below 1 Ω
N13-6 (WF1-) - N15-3 (WF1-)	Always	Below 1 Ω

(i) 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
N12-10 (FR+) - Body ground	Always	10 kΩ or higher
N12-9 (FR-) - Body ground	Always	10 kΩ or higher
N12-3 (FL+) - Body ground	Always	10 kΩ or higher
N12-8 (FL-) - Body ground	Always	10 kΩ or higher
N12-2 (TWR+) - Body ground	Always	10 kΩ or higher
N12-7 (TWR-) - Body ground	Always	10 kΩ or higher
N12-1 (TWL+) - Body ground	Always	10 kΩ or higher
N12-6 (TWL-) - Body ground	Always	10 kΩ or higher
N12-4 (RL+) - Body ground	Always	10 kΩ or higher
N12-11 (RL-) - Body ground	Always	10 kΩ or higher
N12-5 (RR+) - Body ground	Always	10 kΩ or higher
N12-12 (RR-) - Body ground	Always	10 kΩ or higher
N13-3 (R-L+) - Body ground	Always	10 kΩ or higher
N13-9 (R-L-) - Body ground	Always	10 kΩ or higher
N13-4 (R-R+) - Body ground	Always	10 kΩ or higher
N13-10 (R-R-) - Body ground	Always	10 kΩ or higher
N13-1 (WF2+) - Body ground	Always	10 kΩ or higher
N13-5 (WF2-) - Body ground	Always	10 kΩ or higher
N13-2 (WF1+) - Body ground	Always	10 kΩ or higher
N13-6 (WF1-) - Body ground	Always	10 kΩ or higher

(j) w/ Manual (SOS) Switch

Measure the resistance between the DCM (telematics transceiver) and body ground to check for a short circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F39-5 (SPO+) - Body ground	Always	10 kΩ or higher
F39-6 (SPO-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT FRONT NO. 1 SPEAKER ASSEMBLY (for 9 Speakers)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
H1-1 - H1-2	Always	1.4 to 2.2 Ω
I1-1 - I1-2	Always	1.4 to 2.2 Ω

Text in Illustration

Component without harness connected

(Front No. 1 Speaker Assembly)

for RH

for LH

REPLACE FRONT NO. 1 SPEAKER ASSEMBLY

4.	REPLACE FRONT NO. 2 SPEAKER ASSEMBLY (for 9 Speakers)

(a) Replace the front No. 2 speaker assembly with a known good one (See page ).

(b) Check that the malfunction disappears.

OK:

Malfunction disappears.

HINT:

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

END

5.	REPLACE REAR SPEAKER ASSEMBLY (for 9 Speakers)

(a) Replace the rear speaker assembly with a known good one (See page ).

(b) Check that the malfunction disappears.

OK:

Malfunction disappears.

HINT:

Connect all the connectors to the rear speaker assemblies.
If there is a possibility that either the right or left front speaker is defective, inspect by interchanging the right one with the left one.
Perform the above inspection on both LH and RH sides.

END

6.	REPLACE REAR NO. 2 SPEAKER ASSEMBLY (for 9 Speakers)

(a) Replace the rear No. 2 speaker assembly with a known good one (See page ).

(b) Check that the malfunction disappears.

OK:

Malfunction disappears.

HINT:

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

END

7.	INSPECT NO. 1 SPEAKER WITH BOX ASSEMBLY (for 9 Speakers)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
N15-1 (WF1+) - N15-3 (WF1-)	Always	1.6 to 2.4 Ω
N15-2 (WF2+) - N15-4 (WF2-)	Always	1.6 to 2.4 Ω

Text in Illustration

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

Condition	Proceed to
OK (w/ Manual (SOS) Switch)	A
OK (w/o Manual (SOS) Switch)	B
NG	C

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE NO. 1 SPEAKER WITH BOX ASSEMBLY

8.	INSPECT DCM (TELEMATICS TRANSCEIVER)

(a) Disconnect the F39 DCM (Telematics transceiver) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F39-2 (SPI+) - F39-5 (SPO+)	Always	Below 1 Ω
F39-3 (SPI-) - F39-6 (SPO-)	Always	Below 1 Ω
F39-2 (SPI+) - F39-3 (SPI-)	Always	10 kΩ or higher
F39-5 (SPO+) - F39-6 (SPO-)	Always	10 kΩ or higher
F39-2 (SPI+) - Body ground	Always	10 kΩ or higher
F39-3 (SPI-) - Body ground	Always	10 kΩ or higher

Text in Illustration

*a	Component without harness connected (DCM (Telematics Transceiver))

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE DCM (TELEMATICS TRANSCEIVER)

9.	CHECK HARNESS AND CONNECTOR (for 8 Speakers)

(a) Disconnect the connectors from the G6 and G5 navigation receiver assembly and speakers.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G6-1 (FR+) - G10-1 (+)	Always	Below 1 Ω
G6-5 (FR-) - G10-3 (-)	Always	Below 1 Ω
G6-2 (FL+) - G1-1 (+)	Always	Below 1 Ω
G6-6 (FL-) - G1-3 (-)	Always	Below 1 Ω

(c) Measure the resistance between the front No. 1 speaker assembles and the front No. 2 speaker assembles to check for an open circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
H1-1 - G10-2 (TWR+)	Always	Below 1 Ω
H1-2 - G10-4 (TWR-)	Always	Below 1 Ω
I1-1 - G1-2 (TWL+)	Always	Below 1 Ω
I1-2 - G1-4 (TWL-)	Always	Below 1 Ω

(d) Measure the resistance between the navigation receiver assembly, rear speaker assembly RH and rear No. 2 speaker assembly RH to check for an open circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G5-1 (RR+) - J1-1	Always	Below 1 Ω
G5-3 (RR-) - W5-2	Always	Below 1 Ω
W5-1 - J1-2	Always	Below 1 Ω

(e) Measure the resistance between the navigation receiver assembly, rear speaker assembly LH and rear No. 2 speaker assembly LH to check for an open circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G5-2 (RL+) - K1-1	Always	Below 1 Ω
G5-6 (RL-) - W6-2	Always	Below 1 Ω
W6-1 - K1-2	Always	Below 1 Ω

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G6-1 (FR+) - Body ground	Always	10 kΩ or higher
G6-5 (FR-) - Body ground	Always	10 kΩ or higher
G6-2 (FL+) - Body ground	Always	10 kΩ or higher
G6-6 (FL-) - Body ground	Always	10 kΩ or higher
G5-1 (RR+) - Body ground	Always	10 kΩ or higher
G5-3 (RR-) - Body ground	Always	10 kΩ or higher
G5-2 (RL+) - Body ground	Always	10 kΩ or higher
G5-6 (RL-) - Body ground	Always	10 kΩ or higher
G10-2 (TWR+) - Body ground	Always	10 kΩ or higher
G10-4 (TWR-) - Body ground	Always	10 kΩ or higher
G1-2 (TWL+) - Body ground	Always	10 kΩ or higher
G1-4 (TWR-) - Body ground	Always	10 kΩ or higher
W6-1 - Body ground	Always	10 kΩ or higher
W5-1 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	INSPECT FRONT NO. 1 SPEAKER ASSEMBLY (for 8 Speakers)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
H1-1 - H1-2	Always	4 Ω
I1-1 - I1-2	Always	4 Ω

Text in Illustration

Component without harness connected

(Front No. 1 Speaker Assembly)

for RH

for LH

REPLACE FRONT NO. 1 SPEAKER ASSEMBLY

11.	REPLACE FRONT NO. 2 SPEAKER ASSEMBLY (for 8 Speakers)

(a) Replace the front No. 2 speaker assembly with a known good one (See page ).

(b) Check that the malfunction disappears.

OK:

Malfunction disappears.

HINT:

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

END

12.	INSPECT REAR SPEAKER ASSEMBLY (for 8 Speakers)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
J1-1- J1-2	Always	4 Ω
K1-1 - K1-2	Always	4 Ω

Text in Illustration

Component without harness connected

(Rear Speaker Assembly)

for RH

for LH

REPLACE REAR SPEAKER ASSEMBLY

13.	INSPECT REAR NO. 2 SPEAKER ASSEMBLY (for 8 Speakers)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
W5-1 - W5-2	Always	4 Ω
W6-1 - W6-2	Always	4 Ω

Text in Illustration

Component without harness connected

(Rear No. 2 Speaker Assembly)

for RH

for LH

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE REAR NO. 2 SPEAKER ASSEMBLY

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