Toyota Tacoma 2015-2018 Service Manual: Stereo Component Amplifier Disconnected (B15D3)

Toyota Tacoma 2015-2018 Service Manual / Navigation / Multi Info Display / Navigation System / Stereo Component Amplifier Disconnected (B15D3)

DESCRIPTION

The navigation receiver assembly and stereo component amplifier assembly are connected by the AVC-LAN communication line.

When an AVC-LAN communication error occurs between the navigation receiver assembly and stereo component amplifier assembly, this DTC will be stored.

DTC No.	DTC Detection Condition	Trouble Area
B15D3*1	When either condition below is met: Stereo component amplifier assembly is/was not connected while the ignition switch is ON or ACC. Communication between the master unit and the stereo component amplifier assembly is not possible when the engine is started.	Stereo component amplifier assembly power source circuit AVC-LAN circuit between navigation receiver assembly and stereo component amplifier assembly Stereo component amplifier assembly Navigation receiver assembly Harness or connector

HINT:

*1: Even if no fault is present, this DTC may be stored depending on the battery condition or engine start voltage.
The navigation receiver assembly is the master unit.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

CHECK DTC

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

Result

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

GO TO DTC "B15C3" IN DIAGNOSTIC TROUBLE CODE CHART

2.	CHECK OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING)

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

Result

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

HINT:

Electrical noise from radio waves generated by optional components or the wiring for those components may affect AVC-LAN communication.
This DTC may be stored when an AVC-LAN communication error occurs due to electrical noise.

GO TO STEP 4

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.

CHECK DTC

(a) Clear the DTCs (See page (b) Recheck for DTCs and check if the same DTC is output again. ).

(b) Recheck for DTCs and check if the same DTC is output again.

OK:

No DTCs are output.

END

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

(a) Disconnect the 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
S24-6 (GND) - Body ground	Always	Below 1 Ω

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
S31-1 (+B) - S24-6 (GND)	Always	11 to 14 V
S31-5 (+B2) - S24-6 (GND)	Always	11 to 14 V
S23-12 (ACC) - S24-6 (GND)	Ignition switch ACC	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to Stereo Component Amplifier Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Disconnect the N25 navigation receiver assembly connector.

(b) Disconnect the S23 stereo component amplifier assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
N25-7 (TX1+) - S23-8 (TX+)	Always	Below 1 Ω
N25-8 (TX1-) - S23-7 (TX-)	Always	Below 1 Ω
N25-7 (TX1+) - Body ground	Always	10 kΩ or higher
N25-8 (TX1-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

(a) Replace the stereo component amplifier assembly (See page (b) Clear the DTCs (See page ). ).

(b) Clear the DTCs (See page (c) Recheck for DTCs and check if the same DTC is output again. ).

OK:

No DTCs are output.

END

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