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Home >> Lexus >> 2009 >> LS 460 AWD >> Repair and Diagnosis >> Accessories & Equipment >> Entertainment Systems >> Audio/Visual >> AUDIO AND VISUAL SYSTEM (w/ Multi-display) >> Sound Signal Circuit between Radio Receiver and Multi-display Controller >> Inspection Procedure

Inspection Procedure

  1. INSPECT RADIO RECEIVER 
    1. Disconnect the R32 controller connector.
    2. Using an oscilloscope, check the signal waveform between each terminal and body ground according to the conditions, as shown in the chart below.
      Fig 1: Identifying R32 Controller Connector
      G04949026Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Signal waveform 

      SIGNAL WAVEFORM REFERENCE

      Tester Connection Condition Specified Condition
      R32-13 (L6-) - Body ground Audio sound is being produced A waveform synchronized with sound is output
      R32-14 (L6+) - Body ground Audio sound is being produced A waveform synchronized with sound is output
      R32-15 (R6-) - Body ground Audio sound is being produced A waveform synchronized with sound is output
      R32-16 (R6+) - Body ground Audio sound is being produced A waveform synchronized with sound is output

      NG: Go to step 2 

      OK: REPLACE MULTI-DISPLAY CONTROLLER (See  REMOVAL   ) 

  2. CHECK SATELLITE RADIO TUNER 
    1. Check if the satellite radio tuner is equipped on the vehicle.

      Result 

      RESULT REFERENCE

      Result Proceed to
      w/ Satellite radio tuner A
      w/o Satellite radio tuner B

      B:  Go to step  5

      A: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - SATELLITE RADIO TUNER AND MULTI-DISPLAY CONTROLLER) 
    1. Disconnect the L53 receiver connector.
    2. Disconnect the R27 and R29 tuner connectors.
    3. Disconnect the R32 controller connector.
    4. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      L53-2 (CDR+) - R27-2 (R+) Always Below 1 Ω
      L53-3 (CDR-) - R27-3 (R-) Always Below 1 Ω
      L53-4 (CDL+) - R27-4 (L+) Always Below 1 Ω
      L53-5 (CDL-) - R27-5 (L-) Always Below 1 Ω
      L53-1 (CSLD) - R27-1 (SLD) Always Below 1 Ω
      R29-10 (FRI+) - R32-16 (R6+) Always Below 1 Ω
      R29-9 (FRI-) - R32-15 (R6-) Always Below 1 Ω
      R29-8 (FLI+) - R32-14 (L6+) Always Below 1 Ω
      R29-7 (FLI-) - R32-13 (L6-) Always Below 1 Ω
      R29-6 (SLD2) - R32-17 (SLD6) Always Below 1 Ω
      R27-2 (R+) - Body ground Always 10 kΩ or higher
      R27-3 (R-) - Body ground Always 10 kΩ or higher
      R27-4 (L+) - Body ground Always 10 kΩ or higher
      R27-5 (L-) - Body ground Always 10 kΩ or higher
      R32-16 (R6+) - Body ground Always 10 kΩ or higher
      R32-15 (R6-) - Body ground Always 10 kΩ or higher
      R32-14 (L6+) - Body ground Always 10 kΩ or higher
      R32-13 (L6-) - Body ground Always 10 kΩ or higher
      Fig 2: Identifying L53 Radio Receiver, R27 Satellite Radio Tuner And R32 Multi-Display Controller Connector
      G05783506Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to Next Step 

  4. CHECK SATELLITE RADIO TUNER (OPERATION) 
    1. Replace the satellite radio tuner with a normal one and check if the same problem occurs again (see REMOVAL  ).

      OK: 

      Same problem does not occur. 

      NG: REPLACE RADIO RECEIVER (See  REMOVAL   ) 

      OK: END (SATELLITE RADIO TUNER IS DEFECTIVE) 

  5. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - MULTI-DISPLAY CONTROLLER) 
    1. Disconnect the L53 receiver connector.
    2. Disconnect the R32 controller connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      L53-1 (CSLD) - R32-17 (SLD6) Always Below 1 Ω
      L53-2 (CDR+) - R32-16 (R6+) Always Below 1 Ω
      L53-3 (CDR-) - R32-15 (R6-) Always Below 1 Ω
      L53-4 (CDL+) - R32-14 (L6+) Always Below 1 Ω
      L53-5 (CDL-) - R32-13 (L6-) Always Below 1 Ω
      R32-13 (L6-) - Body ground Always 10 kΩ or higher
      R32-14 (L6+) - Body ground Always 10 kΩ or higher
      R32-15 (R6-) - Body ground Always 10 kΩ or higher
      R32-16 (R6+) - Body ground Always 10 kΩ or higher
      Fig 3: Identifying L53 Radio Receiver And R32 Multi-Display Controller Connector
      G05783507Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: REPLACE RADIO RECEIVER (See  REMOVAL   ) 

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