Toyota 4Runner: 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 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

CAUTION / NOTICE / HINT

NOTICE:

After replacing the navigation receiver assembly of vehicles subscribed to pay-type satellite radio broadcasts, XM radio ID registration is necessary.

PROCEDURE

(a) Measure the voltage according to the value(s) in the table below. Standard Voltage: Tester Connection Condition Specified Condition N11-1 (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

(a) Disconnect the G37 navigation receiver assembly connector.

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

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

Standard Resistance:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

(b) Disconnect the G37 navigation receiver assembly connector.

(c) Measure the voltage according to the value(s) in the table below. Standard Voltage: Tester Connection Condition Specified Condition G37-16 (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