Toyota 4Runner: Speaker Output Short (B15C3)

Toyota 4Runner Service Manual / Audio / Visual / Telematics / 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 DCM (telematics transceiver)1 Stereo component amplifier assembly2 Navigation receiver assembly*3

*1: w/ Manual (SOS) Switch
*2: for 9 Speakers
*3: for 8 Speakers

WIRING DIAGRAM

1. for 9 Speakers

2. for 8 Speakers

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR

(a) for 9 Speakers

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

*1: w/ Manual (SOS) Switch

(2) 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

(3) 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

(b) for 8 speakers

(1) Disconnect the G5 and G6 navigation receiver assembly connectors and speaker assembly connectors.

(2) 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

2.	INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

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

Standard Resistance (for 9 Speakers):

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

Standard Resistance (for 8 Speakers):

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

3.	REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

(a) Replace the front No. 2 speaker assembly (See page ).

(b) Clear the DTCs (See page ).

Standard:

NO DTCs are output.

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

4.	CONFIRM MODEL

(a) Choose the model to be inspected.

Model	Proceed to
for 9 Speakers	A
for 8 Speakers	B

GO TO STEP 7

5.	REPLACE REAR SPEAKER ASSEMBLY (for 9 Speakers)

(a) Replace the rear speaker assembly and check if the same DTC are output again.

(1) Replace the rear speaker assembly (See page ).

(2) Clear the DTCs (See page ).

(3) Recheck for DTCs and check if the same DTC are output again (See page ).

Standard:

NO DTCs are output.

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 and check if the same DTC are output again.

(1) Replace the rear No. 2 speaker assembly (See page ).

(2) Clear the DTCs (See page ).

(3) Recheck for DTCs and check if the same DTC are output again (See page ).

Standard:

NO DTCs are output.

HINT:

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

END

GO TO STEP 9

7.	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

8.	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

REPLACE NAVIGATION RECEIVER ASSEMBLY

REPLACE REAR NO.2 SPEAKER ASSEMBLY

9.	INSPECT NO. 1 SPEAKER WITH BOX ASSEMBLY

(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

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

REPLACE NO. 1 SPEAKER WITH BOX ASSEMBLY

10.	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))

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

REPLACE DCM (TELEMATICS TRANSCEIVER)

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