Mute Signal Circuit Between Navigation Receiver Assembly and Stereo Component Tuner Assembly

NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: Mute Signal Circuit between Navigation Receiver Assembly and Stereo Component Tuner Assembly

Mute Signal Circuit between Navigation Receiver Assembly and Stereo Component Tuner Assembly

DESCRIPTION

The navigation receiver assembly controls the volume according to the MUTE signal from the stereo component tuner 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
NOTICE: After replacing the stereo component tuner assembly of vehicles subscribed to pay-type satellite radio broadcasts, registration of the XM radio ID is necessary.

PROCEDURE

1. INSPECT STEREO COMPONENT TUNER 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 - STEREO COMPONENT TUNER)
OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
2. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - STEREO COMPONENT TUNER)




(a) Disconnect the E18 navigation receiver assembly connector.




(b) Disconnect the M20 stereo component tuner assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. REPLACE STEREO COMPONENT TUNER ASSEMBLY
(a) Replace the stereo component tuner assembly and check if it operates normally Removal.
OK:
The navigation system operates normally.

NG -- REPLACE NAVIGATION RECEIVER ASSEMBLY
OK -- END