Toyota Avalon (XX50): Speaker Output Short (B15C3)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Audio, Visual, Telematics / Navigation / Multi Info Display / Navigation System(for Gasoline Model) / Speaker Output Short (B15C3)

DESCRIPTION

This DTC is stored when a malfunction occurs in the speakers.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B15C3	Speaker Output Short	A short is detected in the speaker output circuit	Harness or connector Speaker DCM (telematics transceiver)* Stereo Component Amplifier

*: w/ Manual (SOS) Switch

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System.
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When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occur:
- A communication malfunction DTC may be stored.
- The radio and display receiver assembly may not operate normally.
Before replacing the DCM (telematics transceiver), refer to Registration.
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PROCEDURE

1.	CHECK MODEL

(a) Choose the model to be inspected.

Result	Proceed to
w/ Manual (SOS) Switch	A
w/o Manual (SOS) Switch	B

GO TO STEP 5

2.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY, DCM (TELEMATICS TRANSCEIVER) OR SPEAKERS - BODY GROUND)

(a) Disconnect the G10 stereo component amplifier assembly connector.

(b) Disconnect the G9 DCM (telematics transceiver) connector.

(d) Disconnect the G72 front No. 4 speaker assembly connector.

(e) Disconnect the G79 front No. 3 speaker assembly LH connector.

(f) Disconnect the J3 and J4 rear No. 2 speaker assembly connectors.

(g) Disconnect the K2 and K3 speaker assembly with bracket connectors.

(h) Disconnect the K1 rear No. 3 speaker assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G10-9 (TWR+) or G70-2 - Body ground	Always	10 kΩ or higher
G10-24 (TWR-) or G70-1 - Body ground	Always	10 kΩ or higher
G10-8 (TWL+) or G71-2 - Body ground	Always	10 kΩ or higher
G10-23 (TWL-) or G71-1 - Body ground	Always	10 kΩ or higher
G10-13 (FR+) or G9-2 (SPI+) - Body ground	Always	10 kΩ or higher
G10-28 (FR-) or G9-3 (SPI-) - Body ground	Always	10 kΩ or higher
G10-12 (FL+) or G79-4 (+TW) - Body ground	Always	10 kΩ or higher
G10-27 (FL-) or G79-2 (-TW) - Body ground	Always	10 kΩ or higher
G10-15 (RR+) or J3-4 (+TW) - Body ground	Always	10 kΩ or higher
G10-30 (RR-) or J3-2 (-TW) - Body ground	Always	10 kΩ or higher
G10-14 (RL+) or J4-4 (+TW) - Body ground	Always	10 kΩ or higher
G10-29 (RL-) or J4-2 (-TW) - Body ground	Always	10 kΩ or higher
G10-6 (WF1+) or K1-4 (WF1+) - Body ground	Always	10 kΩ or higher
G10-21 (WF1-) or K1-3 (WF1-) - Body ground	Always	10 kΩ or higher
G10-5 (WF2+) or K1-2 (WF2+) - Body ground	Always	10 kΩ or higher
G10-20 (WF2-) or K1-1 (WF2-) - Body ground	Always	10 kΩ or higher
G10-7 (CTR+) or G72-2 - Body ground	Always	10 kΩ or higher
G10-22 (CTR-) or G72-1 - Body ground	Always	10 kΩ or higher
G10-11 (SR+) or K2-2 - Body ground	Always	10 kΩ or higher
G10-26 (SR-) or K2-1 - Body ground	Always	10 kΩ or higher
G10-10 (SL+) or K3-2 - Body ground	Always	10 kΩ or higher
G10-25 (SL-) or K3-1 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) OR SPEAKER - BODY GROUND)

(a) Disconnect the G9 DCM (telematics transceiver) connector.

(b) Disconnect the G78 front No. 3 speaker assembly RH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G9-5 (SPO+) or G78-4 (+TW) - Body ground	Always	10 kΩ or higher
G9-6 (SPO-) or G78-2 (-TW) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT DCM (TELEMATICS TRANSCEIVER)

(a) Remove the DCM (telematics transceiver).

Click here

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

Standard Resistance:

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

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

GO TO STEP 6

REPLACE DCM (TELEMATICS TRANSCEIVER)

5.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY OR SPEAKERS - BODY GROUND)

(a) Disconnect the G10 stereo component amplifier assembly connector.

(b) Disconnect the G78 and G79 front No. 3 speaker assembly connectors.

(d) Disconnect the J3 and J4 rear No. 2 speaker assembly connectors.

(e) Disconnect the K2 and K3 speaker assembly with bracket connectors.

(f) Disconnect the K1 rear No. 3 speaker assembly connector.

(g) Disconnect the G72 front No. 4 speaker assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G10-13 (FR+) or G78-4 (+TW) - Body ground	Always	10 kΩ or higher
G10-28 (FR-) or G78-2 (-TW) - Body ground	Always	10 kΩ or higher
G10-12 (FL+) or G79-4 (+TW) - Body ground	Always	10 kΩ or higher
G10-27 (FL-) or G79-2 (-TW) - Body ground	Always	10 kΩ or higher
G10-9 (TWR+) or G70-2 - Body ground	Always	10 kΩ or higher
G10-24 (TWR-) or G70-1 - Body ground	Always	10 kΩ or higher
G10-8 (TWL+) or G71-2 - Body ground	Always	10 kΩ or higher
G10-23 (TWL-) or G71-1 - Body ground	Always	10 kΩ or higher
G10-15 (RR+) or J3-4 (+TW) - Body ground	Always	10 kΩ or higher
G10-30 (RR-) or J3-2 (-TW) - Body ground	Always	10 kΩ or higher
G10-14 (RL+) or J4-4 (+TW) - Body ground	Always	10 kΩ or higher
G10-29 (RL-) or J4-2 (-TW) - Body ground	Always	10 kΩ or higher
G10-6 (WF1+) or K1-4 (WF1+) - Body ground	Always	10 kΩ or higher
G10-21 (WF1-) or K1-3 (WF1-) - Body ground	Always	10 kΩ or higher
G10-5 (WF2+) or K1-2 (WF2+) - Body ground	Always	10 kΩ or higher
G10-20 (WF2-) or K1-1 (WF2-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	CHECK HARNESS AND CONNECTOR (FRONT NO. 1 SPEAKER ASSEMBLY OR FRONT NO. 3 SPEAKER ASSEMBLY - BODY GROUND)

(a) Disconnect the I1 and I15 front No. 1 speaker assembly connectors.

(b) Disconnect the G78 and G79 front No. 3 speaker assembly connectors.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I1-2 or G78-3 (+) - Body ground	Always	10 kΩ or higher
I1-1 or G78-1 (-) - Body ground	Always	10 kΩ or higher
I15-2 or G79-3 (+) - Body ground	Always	10 kΩ or higher
I15-1 or G79-1 (-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	CHECK HARNESS AND CONNECTOR (REAR SPEAKER ASSEMBLY OR REAR NO. 2 SPEAKER ASSEMBLY - BODY GROUND)

(a) Disconnect the J3 and J4 rear No. 2 speaker assembly connectors.

(b) Disconnect the J1 and J2 rear speaker assembly connectors.

Standard Resistance:

Tester Connection	Condition	Specified Condition
J1-1 or J3-3 (+) - Body ground	Always	10 kΩ or higher
J1-2 or J3-1 (-) - Body ground	Always	10 kΩ or higher
J2-1 or J4-3 (+) - Body ground	Always	10 kΩ or higher
J2-2 or J4-1 (-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

(a) Remove the front No. 1 speaker assembly.

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(b) Inspect the front No. 1 speaker assembly.

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REPLACE FRONT NO. 1 SPEAKER ASSEMBLY

9.	INSPECT FRONT NO. 2 SPEAKER ASSEMBLY

(a) Remove the front No. 2 speaker assembly.

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(b) Inspect the front No. 2 speaker assembly.

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REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

10.	INSPECT FRONT NO. 4 SPEAKER ASSEMBLY

(a) Remove the front No. 4 speaker assembly.

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(b) Inspect the front No. 4 speaker assembly.

Click here

REPLACE FRONT NO. 4 SPEAKER ASSEMBLY

11.	INSPECT REAR SPEAKER ASSEMBLY

(a) Remove the rear speaker assembly.

Click here

(b) Inspect the rear speaker assembly.

Click here

REPLACE REAR SPEAKER ASSEMBLY

12.	INSPECT REAR NO. 3 SPEAKER ASSEMBLY

(a) Remove the rear No. 3 speaker assembly.

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(b) Inspect the rear No. 3 speaker assembly.

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REPLACE REAR NO. 3 SPEAKER ASSEMBLY

13.	INSPECT SPEAKER ASSEMBLY WITH BRACKET

(a) Remove the speaker assembly with bracket.

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(b) Inspect the speaker assembly with bracket.

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REPLACE SPEAKER ASSEMBLY WITH BRACKET

14.	REPLACE FRONT NO. 3 SPEAKER ASSEMBLY

(a) Remove the front No. 3 speaker assembly.

Click here

(b) Inspect the front No. 3 speaker assembly.

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Body Electrical > Navigation System > Clear DTCs

(d) Recheck for DTCs and check that no DTCs are output.

Body Electrical > Navigation System > Trouble Codes

OK:

No DTCs are output.

END

15.	REPLACE REAR NO. 2 SPEAKER ASSEMBLY

(a) Remove the rear No. 2 speaker assembly.

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(b) Inspect the rear No. 2 speaker assembly.

Click here

Body Electrical > Navigation System > Clear DTCs

(d) Recheck for DTCs and check that no DTCs are output.

Body Electrical > Navigation System > Trouble Codes

OK:

No DTCs are output.

END

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

Navigation Processor Malfunction (B15AD). GPS Antenna Connection Malfunction(short) (B15C0,B15C1). Speed Signal Malfunction (B15C2)

Stereo Component Amplifier Disconnected (B15D3). Telematics Transceiver Disconnected (B15DB). Air Conditioner ECU Vehicle Information Reading/Writing Processor Malfunction (B15F5)

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