Mute Signal Circuit Between Navigation Receiver Assembly and Stereo Component Amplifier

NAVIGATION: NAVIGATION SYSTEM: Mute Signal Circuit between Navigation Receiver Assembly and Stereo Component Amplifier

Mute Signal Circuit between Navigation Receiver Assembly and Stereo Component Amplifier

DESCRIPTION

This circuit sends a signal to the stereo component amplifier 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 is functioning normally, no sound, or only an extremely faint sound, can be heard.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT STEREO COMPONENT AMPLIFIER





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






NG -- CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - STEREO COMPONENT AMPLIFIER)
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - STEREO COMPONENT AMPLIFIER)





(a) Disconnect navigation receiver assembly connector E2 and stereo component amplifier connector N14.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. INSPECT STEREO COMPONENT AMPLIFIER (OUTPUT SIGNAL)





(a) Reconnect stereo component amplifier connector N14.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPLACE STEREO COMPONENT AMPLIFIER
OK -- REPLACE NAVIGATION RECEIVER ASSEMBLY