Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Stereo Component Amplifier Disconnected (B15D3)

DESCRIPTION

The radio receiver assembly and stereo component amplifier assembly are connected by AVC-LAN communication lines.

This DTC is stored when an AVC-LAN communication error occurs between the radio receiver assembly and stereo component amplifier assembly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B15D3	Stereo Component Amplifier Disconnected	A device that is listed in the AVC-LAN connected device record of the master unit is missing	Stereo component amplifier assembly power source circuit AVC-LAN circuit between radio receiver assembly and stereo component amplifier assembly Stereo component amplifier assembly Radio receiver assembly Harness or connector

HINT:

The radio receiver assembly is the master unit.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1.

CHECK DTC

(a) If DTC B15C3 is output, perform troubleshooting for DTC B15C3 first.

Result	Proceed to
DTC B15C3 is not output.	A
DTC B15C3 is output.	B

B

GO TO DTC B15C3

A

2.	CHECK OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING)

(a) Check that optional components (including associated wiring) which generate radio waves are not installed.

Result	Proceed to
Optional components (including associated wiring) are installed.	A
Optional components (including associated wiring) are not installed.	B

B

GO TO STEP 4

A

3.	REMOVE OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING)

(a) Remove optional components (including associated wiring).

NOTICE:

Do not remove optional components or associated wiring without the permission of the customer.

NEXT

4.

CHECK DTC

(a) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

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

Body Electrical > Navigation System > Trouble Codes

OK:

No DTCs are output.

OK

END

NG

5.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY POWER SOURCE)

(a) Disconnect the J66 and J156 stereo component amplifier assembly connectors.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
J66-3 (GND) - Body ground	Always	Below 1 Ω
J66-18 (GND2) - Body ground	Always	Below 1 Ω

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
J66-1 (+B) - J66-3 (GND)	Always	11 to 14 V
J66-16 (+B2) - J66-3 (GND)	Always	11 to 14 V
J156-12 (ACC) - J66-3 (GND)	Engine switch on (ACC)	11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.	CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)

(a) Disconnect the J148 radio receiver assembly connector.

(b) Disconnect the J156 stereo component amplifier assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
J148-17 (TX2+) - J156-8 (TX+)	Always	Below 1 Ω
J148-18 (TX2-) - J156-7 (TX-)	Always	Below 1 Ω
J148-17 (TX2+) or J156-8 (TX+) - Body ground	Always	10 kΩ or higher
J148-18 (TX2-) or J156-7 (TX-) - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.	REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

(a) Replace the stereo component amplifier assembly with a new or known good one.

Click here

(b) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

(c) 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 RADIO RECEIVER ASSEMBLY