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Mute Signal Circuit between Navigation Receiver Assembly and Stereo Component Amplifier: Procedure

  1. INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY 
    1. Measure the voltage according to the value(s) in the table below.
      Fig 1: Identifying L31 Connector
      GTY223706Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Condition Specified Condition
      L31-1 (MUTE) - Body ground Power switch on (ACC), Audio system playing → Changing source Above 3.5 V → Below 1 V
      TEXT IN ILLUSTRATION

      *1 Component with harness connected
      (Stereo Component Amplifier Assembly)

    NG → See step   2 

    OK → See step   5 

  2. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - STEREO COMPONENT AMPLIFIER) 
    1. Disconnect the L40 navigation receiver assembly connector.
      Fig 2: Identifying L40 Navigation Receiver Assembly Connector
      GTY215567Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the L31 stereo component amplifier assembly connector.
      Fig 3: Identifying L31 Stereo Component Amplifier Assembly Connector
      GTY235937Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L40-7 (MUTE) - L31-1 (MUTE) Always Below 1 Ω
      L40-7 (MUTE) - Body ground Always 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *1 Front view of wire harness connector
      (to Navigation Receiver Assembly)
      *2 Front view of wire harness connector
      (to Stereo Component Amplifier Assembly)

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY (OUTPUT SIGNAL) 
    1. Reconnect the L31 stereo component amplifier assembly connector.
      Fig 4: Identifying L31 Stereo Component Amplifier Assembly Connector
      GTY223706Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      L31-1 (MUTE) - Body ground Power switch on (ACC)
      Audio system playing      		 Above 3.5 V
      TEXT IN ILLUSTRATION

      *1 Component with harness connected
      (Stereo Component Amplifier Assembly)

    NG → See step   6 

    OK → See step   4 

  4. REPLACE NAVIGATION RECEIVER ASSEMBLY. Refer to  REMOVAL 
  5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  6. REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to  REMOVAL 
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