Mute Signal Circuit between Navigation Receiver Assembly and Television Display Assembly

NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM (for SD): 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 popping sounds as such as those generated when switching modes.

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:





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - TELEVISION DISPLAY ASSEMBLY)

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table

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

(a) Disconnect the D59 navigation receiver assembly connector.

(b) Disconnect the U1 television display 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 -- Continue to next step.

3. INSPECT NAVIGATION RECEIVER ASSEMBLY (OUTPUT SIGNAL)

(a) Reconnect the navigation receiver assembly connector.

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





Standard Voltage:





Text in Illustration





NG -- REPLACE NAVIGATION RECEIVER ASSEMBLY Service and Repair

OK -- REPLACE TELEVISION DISPLAY ASSEMBLY Service and Repair