Mute Signal Circuit Between Navigation Receiver Assembly and Multi-media Interface ECU

NAVIGATION: NAVIGATION SYSTEM: Mute Signal Circuit between Navigation Receiver Assembly and Multi-media Interface ECU
- Mute Signal Circuit between Navigation Receiver Assembly and Multi-media Interface ECU

DESCRIPTION

The navigation receiver assembly controls the volume according to the mute signal from the multi-media interface ECU.

The mute signal is sent to reduce noise and popping sounds, 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 MULTI-MEDIA INTERFACE ECU

(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 - MULTI-MEDIA INTERFACE ECU)

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures

2. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - MULTI-MEDIA INTERFACE ECU)

(a) Disconnect the E15 navigation receiver assembly connector.

(b) Disconnect the E31 multi-media interface ECU 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 MULTI-MEDIA INTERFACE ECU

(a) Replace the multi-media interface ECU and check that the malfunction disappears Removal.

OK:

Malfunction disappears.

NG -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures

OK -- END (MULTI-MEDIA INTERFACE ECU IS DEFECTIVE)