Toyota Venza: Mute Signal Circuit between Navigation Receiver Assembly and Stereo Component Amplifier

Toyota Venza Service Manual / Navigation / Multi Info Display / Navigation System / 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. Due to this, 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

1.	INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

E14-1 (MUTE) - Body ground

Ignition switch ACC

Audio system playing

→ Audio system changing modes

2.0 V or higher

→ Below 1 V

Text in Illustration

*a	Component with harness connected (Stereo Component Amplifier Assembly)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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

(a) Disconnect the E40 navigation receiver assembly connector.

(b) Disconnect the E14 stereo component amplifier assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
E40-16 (MUT1) - E14-1 (MUTE)	Always	Below 1 Ω
E40-16 (MUT1) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY

(a) Disconnect the E40 navigation receiver assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

E40-16 (MUT1) - Body ground

Ignition switch ACC

Audio system playing

2.0 V or higher

Text in Illustration

*a	Front view of wire harness connector (to Navigation Receiver Assembly)

REPLACE NAVIGATION RECEIVER ASSEMBLY

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

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