Mute Signal Circuit Between Stereo Component Tuner Assembly and Multi-media Interface ECU (from 12/2010)
NAVIGATION: NAVIGATION SYSTEM: Mute Signal Circuit between Stereo Component Tuner Assembly and Multi-media Interface ECU
- Mute Signal Circuit between Stereo Component Tuner Assembly and Multi-media Interface ECU
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 (MULTI-MEDIA INTERFACE ECU - STEREO COMPONENT TUNER ASSEMBLY)
OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table (from 12/2010)
2. CHECK HARNESS AND CONNECTOR (MULTI-MEDIA INTERFACE ECU - STEREO COMPONENT TUNER ASSEMBLY)
(a) Disconnect the E49 multi-media interface ECU connector.
(b) Disconnect the E50 stereo component tuner 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. REPLACE STEREO COMPONENT TUNER ASSEMBLY
(a) Replace the stereo component tuner assembly and check that the malfunction disappears Removal (from 12/2010).
OK:
Malfunction disappears.
NG -- REPLACE MULTI-MEDIA INTERFACE ECU Removal (from 12/2010)
OK -- END