Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: 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 Stereo component amplifier assembly

WIRING DIAGRAM

for 9 Speakers for 12 Speakers for 15 Speakers for 15 Speakers

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 Audio and Visual System.

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PROCEDURE

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

(a) Disconnect the J66 stereo component amplifier assembly connector.

(b) Disconnect the K2 front No. 3 speaker assembly connector.

(c) Disconnect the K6 and K8 front No. 2 speaker assembly connectors (for 9 Speakers).

Disconnect the K5 and K7 front No. 2 speaker assembly connectors (except 9 Speakers).

(d) Disconnect the M3 and N3 front No. 1 speaker assembly connectors.

(e) Disconnect the O5 and P5 rear No. 2 speaker assembly connectors.

(f) Disconnect the S53 rear No. 3 speaker assembly connector (except 9 Speakers).

(g) Disconnect the R25 and S38 quarter side speaker assembly connectors (for 15 Speakers).

(h) Measure the resistance between the stereo component amplifier assembly or the speakers and body ground to check for a short in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
J66-7 (CTR+) or K2-2 - Body ground	Always	10 kΩ or higher
J66-22 (CTR-) or K2-1 - Body ground	Always	10 kΩ or higher
J66-13 (FR+) or K6-4 - Body ground*1 J66-13 (FR+) or K5-2 - Body ground*2	Always	10 kΩ or higher
J66-28 (FR-) or K6-2 - Body ground*1 J66-28 (FR-) or K5-1 - Body ground*2	Always	10 kΩ or higher
J66-12 (FL+) or K8-4 - Body ground*1 J66-12 (FL+) or K7-2 - Body ground*2	Always	10 kΩ or higher
J66-27 (FL-) or K8-2 - Body ground*1 J66-27 (FL-) or K7-1 - Body ground*2	Always	10 kΩ or higher
J66-5 (WFR+) or M3-1 - Body ground	Always	10 kΩ or higher
J66-20 (WFR-) or M3-2 - Body ground	Always	10 kΩ or higher
J66-4 (WFL+) or N3-1 - Body ground	Always	10 kΩ or higher
J66-19 (WFL-) or N3-2 - Body ground	Always	10 kΩ or higher
J66-9 (RR+) or O5-4 (+TW) - Body ground	Always	10 kΩ or higher
J66-24 (RR-) or O5-2 (-TW) - Body ground	Always	10 kΩ or higher
J66-8 (RL+) or P5-4 (+TW) - Body ground	Always	10 kΩ or higher
J66-23 (RL-) or P5-2 (-TW) - Body ground	Always	10 kΩ or higher
J66-6 (WF1+) or S53-1 - Body ground*2	Always	10 kΩ or higher
J66-21 (WF1-) or S53-2 - Body ground*2	Always	10 kΩ or higher
J66-11 (SR+) or R25-2 - Body ground*3	Always	10 kΩ or higher
J66-26 (SR-) or R25-1 - Body ground*3	Always	10 kΩ or higher
J66-10 (SL+) or S38-2 - Body ground*3	Always	10 kΩ or higher
J66-25 (SL-) or S38-1 - Body ground*3	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

(a) Disconnect the O2 and P2 rear speaker assembly connectors.

(b) Disconnect the O5 and P5 rear No. 2 speaker assembly connectors.

(c) Measure the resistance between the rear speaker assembly or the rear No. 2 speaker assembly and body ground to check for a short in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
O2-1 or O5-3 (+) - Body ground	Always	10 kΩ or higher
O2-2 or O5-1 (-) - Body ground	Always	10 kΩ or higher
P2-1 or P5-3 (+) - Body ground	Always	10 kΩ or higher
P2-2 or P5-1 (-) - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.	CHECK MODEL

(a) Choose the model to be inspected.

Result	Proceed to
except 15 Speakers	A
for 15 Speakers	B

B

GO TO STEP 5

A

4.	INSPECT FRONT NO. 3 SPEAKER ASSEMBLY

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

Click here

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

Click here

OK

GO TO STEP 6

NG

REPLACE FRONT NO. 3 SPEAKER ASSEMBLY

5.	INSPECT FRONT NO. 3 SPEAKER ASSEMBLY

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

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

Click here

(c) Clear the DTCs.

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.

OK

END

NG

6.	INSPECT FRONT NO. 2 SPEAKER ASSEMBLY

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

Click here

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

Click here

(c) Clear the DTCs.

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.

OK

END

NG

7.	INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

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

Click here

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

Click here

NG

REPLACE FRONT NO. 1 SPEAKER ASSEMBLY

OK

8.	INSPECT REAR SPEAKER ASSEMBLY

(a) Remove the rear speaker assembly.

Click here

(b) Inspect the rear speaker assembly.

Click here

Result	Proceed to
OK (for 9 Speakers)	A
OK (except 9 Speakers)	B
NG	C

B

GO TO STEP 10

C

REPLACE REAR SPEAKER ASSEMBLY

A

9.	INSPECT REAR NO. 2 SPEAKER ASSEMBLY

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

Click here

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

Click here

(c) Clear the DTCs.

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.

OK

END

NG

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

10.	INSPECT REAR NO. 2 SPEAKER ASSEMBLY

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

Click here

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

Click here

(c) Clear the DTCs.

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.

Result	Proceed to
OK	A
NG (for 12 Speakers)	B
NG (for 15 Speakers)	C

A

END

C

GO TO STEP 12

B

11.	INSPECT REAR NO. 3 SPEAKER ASSEMBLY

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

w/o Rear No. 2 Seat: Click here

w/ Rear No. 2 Seat: Click here

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

w/o Rear No. 2 Seat: Click here

w/ Rear No. 2 Seat: Click here

OK

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

NG

REPLACE REAR NO. 3 SPEAKER ASSEMBLY

12.	INSPECT REAR NO. 3 SPEAKER ASSEMBLY

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

w/o Rear No. 2 Seat: Click here

w/ Rear No. 2 Seat: Click here

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

w/o Rear No. 2 Seat: Click here

w/ Rear No. 2 Seat: Click here

NG

REPLACE REAR NO. 3 SPEAKER ASSEMBLY

OK

13.	INSPECT QUARTER SIDE SPEAKER ASSEMBLY

(a) Remove the quarter side speaker assembly.

w/o Rear No. 2 Seat: Click here

w/ Rear No. 2 Seat: Click here

(b) Inspect the quarter side speaker assembly.

w/o Rear No. 2 Seat: Click here

w/ Rear No. 2 Seat: Click here

OK

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

NG

REPLACE QUARTER SIDE SPEAKER ASSEMBLY