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 radio and navigation 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 radio and navigation assembly is normal, no sound or only an extremely small sound can be produced.

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:





OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

NG -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (RADIO AND NAVIGATION ASSEMBLY - TELEVISION DISPLAY ASSEMBLY)




(a) Disconnect the radio and navigation assembly connector R11 and television display assembly connector R18.
(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.
OK:
The navigation system operates normally.
OK -- NORMAL OPERATION

NG -- REPLACE RADIO AND NAVIGATION ASSEMBLY