Toyota 4Runner: Mute Signal Circuit between Stereo Component Amplifier and Telematics Transceiver

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Navigation / Multi Info Display / Navigation System / Mute Signal Circuit between Stereo Component Amplifier and Telematics Transceiver

DESCRIPTION

The DCM (telematics transceiver) sends a mute signal to the stereo component amplifier assembly.

The stereo component amplifier assembly controls the volume according to the mute signal from the DCM (telematics transceiver).

WIRING DIAGRAM

PROCEDURE

1.	INSPECT DCM (TELEMATICS TRANSCEIVER)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

F39-17 (MUTE) - Body ground

Ignition switch ACC, audio system is playing

→ Emergency call mode

Above 3.5 V

→ Below 1 V

Text in Illustration

*a	Component with harness connected (DCM (Telematics Transceiver))

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER))

(a) Disconnect the N11 stereo component amplifier assembly connector.

(b) Disconnect the F39 DCM (telematics transceiver) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
N11-24 (TMUT) - F39-17 (MUTE)	Always	Below 1 Ω
N11-24 (TMUT) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY

(a) Reconnect the N11 stereo component amplifier assembly connector.

(b) Disconnect the F39 DCM (telematics transceiver) connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
F39-17 (MUTE) - Body ground	Ignition switch ACC	Above 3.5 V

Text in Illustration

*a	Front view of wire harness connector (to DCM (Telematics Transceiver))

REPLACE DCM (TELEMATICS TRANSCEIVER)

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

Mute Signal Circuit between Navigation Receiver Assembly 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 th ...

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 about Toyota 4Runner:

Lost Communication with A/C ECU (U0164)
DESCRIPTION DTC Code DTC Detection Condition Trouble Area U0164 There is no communication from the air conditioning amplifier assembly. Power source or inside air conditioning ...

Microphone Amplifier
Components COMPONENTS ILLUSTRATION ILLUSTRATION Removal REMOVAL PROCEDURE 1. REMOVE DRIVE MONITOR SWITCH 2. REMOVE MAP LIGHT ASSEMBLY 3. REMOVE TELEPHONE MICROPHONE ASSEMBLY (a) Disconnect the 6 connectors. ...