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Home › Lexus › 2008 › LX 570 › Repair and Diagnosis › Accessories & Equipment › Infotainment › Navigation › Navigation System › Microphone Circuit between Overhead Junction Block and Multi-display › Inspection Procedure

Inspection Procedure

  1. CHECK DISPLAY AND NAVIGATION MODULE DISPLAY 
    1. Check the waveform of the microphone using an oscilloscope.

      Standard 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      F27-11 (MIN+) - F27-10 (MIN-) w/o LEXUS Link System-Engine switch on (ACC) and "Voice" switch of steering pad switch pressed
      w/ LEXUS Link System: Engine switch on (ACC) and "PHONE" button of overhead junction block pressed      		 Waveform the matches sound spoken into microphone is output.

    NG: Go to step 2 

    Fig 1: Identifying Display And Navigation Module Display Connector Terminals
    G05763432Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY  (See REMOVAL  )

  2. CHECK LEXUS LINK SYSTEM 
    1. Check if the vehicle is equipped with the LEXUS link system.

      Result 

      RESULT CHART

      Result Proceed to
      w/o LEXUS Link System A
      w/ LEXUS Link System B

    B:  Go to step  6

    A: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (OVERHEAD JUNCTION BLOCK - DISPLAY AND NAVIGATION MODULE DISPLAY) 
    1. Disconnect the R7 overhead junction block connector.
    2. Disconnect the F27 display connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      F27-9 (MACC) - R7-22 (ACC) Always Below 1 Ω
      F27-11 (MIN+) - R7-21 (MI1+) Always Below 1 Ω
      F27-10 (MIN-) - R7-20 (MIC-) Always Below 1 Ω
      F27-9 (MACC) - Body ground Always 10 kΩ or higher
      F27-11 (MIN+) - Body ground Always 10 kΩ or higher
      F27-10 (MIN-) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Identifying Overhead Junction Block And Display And Navigation Module Display Connector Terminals
    G05763433Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  4. CHECK DISPLAY AND NAVIGATION MODULE DISPLAY (MACC VOLTAGE) 
    1. Reconnect the F27 display connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Switch Condition Specified Condition
      F27-9 (MACC) - Body ground Engine switch on (ACC) 4 to 6V

    NG: REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY  (See REMOVAL  )

    Fig 3: Identifying Display And Navigation Module Display Connector Terminals
    G05763434Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  5. CHECK MICROPHONE ASSEMBLY 
    1. Remove the microphone from the overhead junction block (See REMOVAL ).
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      1 (MIC+) - 3 (MIC-) Always 1.9 to 2.2 kΩ

    NG: REPLACE MICROPHONE ASSEMBLY  (See REMOVAL )

    Fig 4: Identifying Microphone Assembly Connector Terminals
    G04945663Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE  (See PROBLEM SYMPTOMS TABLE  )

  6. CHECK HARNESS AND CONNECTOR (TELEPHONE ECU - DISPLAY AND NAVIGATION MODULE DISPLAY AND OVERHEAD JUNCTION BLOCK) 
    1. Disconnect the P2 ECU connector.
    2. Disconnect the F27 display connector.
    3. Disconnect the R7 junction block connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      P2-17 (MCO+) - F27-11 (MIN+) Always Below 1 Ω
      P2-18 (MCO-) - F27-10 (MIN-) Always Below 1 Ω
      P2-7 (MCVD) - R7-22 (ACC) Always Below 1 Ω
      P2-8 (MCI+) - R7-21 (MI1+) Always Below 1 Ω
      P2-9 (MCI-) - R7-20 (MIC-) Always Below 1 Ω
      P2-17 (MCO+) - Body ground Always 10 kΩ or higher
      P2-18 (MCO-) - Body ground Always 10 kΩ or higher
      P2-19 (SGND) - Body ground Always 10 kΩ or higher
      P2-7 (MCVD) - Body ground Always 10 kΩ or higher
      P2-8 (MCI+) - Body ground Always 10 kΩ or higher
      P2-9 (MCI-) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 5: Identifying Telephone ECU And Overhead Junction Block Connector Terminals
    G05763436Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  7. CHECK TELEPHONE ECU ASSEMBLY (TACC VOLTAGE) 
    1. Reconnect the P2 ECU connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Switch Condition Specified Condition
      P2-7 (MCVD) - Body ground Engine switch on (ACC) 4 to 6V

    NG: REPLACE TELEPHONE ECU ASSEMBLY  (See REMOVAL )

    Fig 6: Identifying P2 ECU Connector Terminals
    G05762930Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  8. CHECK MICROPHONE ASSEMBLY 
    1. Remove the microphone from the overhead junction block (See REMOVAL ).
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      1 (MIC+) - 3 (MIC-) Always 1.9 to 2.2 kΩ

    NG: REPLACE MICROPHONE ASSEMBLY  (See REMOVAL )

    Fig 7: Identifying Microphone Assembly Connector Terminals
    G04945663Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE  (See PROBLEM SYMPTOMS TABLE  )

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