Mute Signal Circuit between Radio Receiver and Multi-media Interface ECU

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- Mute Signal Circuit between Radio Receiver and Multi-media Interface ECU

DESCRIPTION

The multi-media interface ECU sends a mute signal to the radio receiver.

The radio 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 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 radio receiver assembly is functioning, no sound, or only an extremely faint sound, can be heard.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK MULTI-MEDIA INTERFACE ECU

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





Standard Voltage:





NG -- CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - MULTI-MEDIA INTERFACE ECU)

OK -- REPLACE MULTI-MEDIA INTERFACE ECU Removal

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

(a) Disconnect the I8 radio receiver assembly connector.





(b) Disconnect the H110 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 -- REPLACE RADIO RECEIVER ASSEMBLY Removal