Mute Signal Circuit Between Stereo Component Amplifier and Telematics Transceiver

NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: Mute Signal Circuit between Stereo Component Amplifier and Telematics Transceiver
- Mute Signal Circuit between Stereo Component Amplifier and Telematics Transceiver

DESCRIPTION

The DCM (telematics transceiver) sends a mute signal to the stereo component amplifier assembly.

The stereo component amplifier assembly controls the volume according to the mute signal from the DCM (telematics transceiver).

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 stereo component amplifier assembly is functioning, no sound, or only an extremely faint sound, can be heard.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
If the DCM (telematics transceiver) has been replaced, perform the Activate DCM procedure using the Techstream DCM Activation.

PROCEDURE

1. INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY

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

Standard Voltage:

Text in Illustration

NG -- CHECK HARNESS AND CONNECTOR

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

2. CHECK HARNESS AND CONNECTOR

(a) Disconnect the L31 stereo component amplifier assembly connector.

(b) Disconnect the L19 DCM (telematics transceiver) connector.

Text in Illustration

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

3. INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY

(a) Reconnect the L31 stereo component amplifier assembly connector.

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

Standard Voltage:

Text in Illustration

NG -- REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Removal

OK -- REPLACE DCM (TELEMATICS TRANSCEIVER) Removal