Mute Signal Circuit Between Navigation Receiver Assembly and Television Display Assembly

NAVIGATION: NAVIGATION SYSTEM: Mute Signal Circuit between Navigation Receiver Assembly and Television Display Assembly

Mute Signal Circuit between Navigation Receiver Assembly and Television Display Assembly

DESCRIPTION

The navigation receiver assembly controls the volume according to the MUTE signal from the television display assembly.
The MUTE signal is sent to reduce noise and a popping sound generated when switching the mode, etc. 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 navigation receiver assembly is functioning normally, no sound or only an extremely faint sound can be heard.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT TELEVISION DISPLAY ASSEMBLY





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






NG -- CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - TELEVISION DISPLAY ASSEMBLY)
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - TELEVISION DISPLAY ASSEMBLY)





(a) Disconnect navigation receiver assembly connector E15 and television display assembly connector Q13.





(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. REPLACE TELEVISION DISPLAY ASSEMBLY
(a) Replace the television display assembly and check if it operates normally Removal.
OK:
The navigation system operates normally.
NG -- REPLACE NAVIGATION RECEIVER ASSEMBLY
OK -- NORMAL OPERATION