Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier

Toyota Tacoma 2015-2018 Service Manual / Navigation / Multi Info Display / Navigation System / Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier

DESCRIPTION

This circuit sends a signal to the stereo component amplifier assembly to mute noise. Because of that, the noise produced by changing the sound source ceases.

If there is an open in the circuit, noise can be heard from the speakers when changing the sound source.

If there is a short in the circuit, even though the stereo component amplifier assembly is functioning normally, no sound or only an extremely faint sound can be heard.

WIRING DIAGRAM

PROCEDURE

PROCEDURE

1.

INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY

(a) Remove the stereo component amplifier assembly with connectors still connected.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

S23-1 (MUTE) - Body ground

Ignition switch ACC, audio system playing

→ Changing modes

Above 3.5 V

→ Below 1 V

Text in Illustration

*a

Component with harness connected

(Stereo Component Amplifier Assembly)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

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.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

N25-16 (MUT1) - S23-1 (MUTE)

Always

Below 1 Ω

N25-16 (MUT1) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY (OUTPUT SIGNAL)

(a) Reconnect the S23 stereo component amplifier assembly connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

N25-16 (MUT1) - Body ground

Ignition switch ACC, audio system is playing

Above 3.5 V

Text in Illustration

*a

Front view of wire harness connector

(to Navigation Receiver Assembly)

OK

REPLACE NAVIGATION RECEIVER ASSEMBLY

NG

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

Data Signal Circuit between Navigation Receiver Assembly and Extension Module
DESCRIPTION The stereo component tuner assembly sends the sound data signal or image data signal from a device to the navigation receiver assembly via this circuit. WIRING DIAGRAM CAUTION / NOT ...

AVC-LAN Circuit
DESCRIPTION Each unit of the navigation system connected to the AVC-LAN (communication bus) transfers the switch signals using the AVC-LAN. If a short to +B or short to ground occurs in the AVC-LA ...

Other materials:

System Diagram
SYSTEM DIAGRAM Communication Table Sender Receiver Signal Communication Method Airbag sensor assembly Main body ECU Front seat inner belt assembly LH buckle switch CAN Combination mete ...

Starting System
Parts Location PARTS LOCATION ILLUSTRATION ILLUSTRATION Precaution PRECAUTION 1. IGNITION SWITCH EXPRESSIONS (a) The type of ignition switch used on this model differs depending on the specifications of the vehicle. The expressions listed in the table below are used in this section. ...

Pressure Control Solenoid "B" Performance (Shift Solenoid Valve SL2) (P0776)
SYSTEM DESCRIPTION The ECM uses the vehicle speed signal and signals from the transmission revolution sensors (NT, SP2) to detect the actual gear (1st, 2nd, 3rd, 4th, 5th or 6th gear). The ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical problems of t ...

© 2011-2018 Copyright www.ttguide.net