NAVIGATION SYSTEM(for Radio and Display Type) Mute Signal Circuit between Stereo Component Amplifier and Telematics Transceiver

DESCRIPTION

This 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 telematics transceiver.

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 normally, no sound or only an extremely faint sound can be heard.

WIRING DIAGRAM

B001DLJE35
*1 MUTE
*2 Stereo Component Amplifier Assembly
*3 Telematics Transceiver

CAUTION / NOTICE / HINT

Tech Tips

When replacing telematics transceiver, perform the vehicle contract setting.

Click here

PROCEDURE


  1. INSPECT TELEMATICS TRANSCEIVER


    1. B001FQMC06
      *a

      Component with harness connected

      (Telematics Transceiver)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G187-17 (MUTE) - Body ground

      Engine switch on (ACC)

      Audio system playing

      → Emergency call mode

      		 3.5 V or higher → Below 1 V
      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - TELEMATICS TRANSCEIVER)


    1. Disconnect the H63 stereo component amplifier assembly connector.

    2. Disconnect the G187 telematics transceiver connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H63-24 (TMUT) - G187-17 (MUTE) Always Below 1 Ω
      H63-24 (TMUT) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY


    1. Reconnect the stereo component amplifier assembly connector.

    2. B001FC6C34
      *a

      Front view of wire harness connector

      (to Telematics Transceiver)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G187-17 (MUTE) - Body ground Engine switch on (ACC) 3.5 V or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TELEMATICS TRANSCEIVER Click here

    NG

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here