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

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