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HOMESERVICE MANUALSLEXUS2010LS 460L AWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTINFOTAINMENTAUDIO / VISUAL (W/ MULTI-DISPLAY) (DIAGNOSTIC CODES & SYMPTOM TESTS)AUDIO AND VISUAL SYSTEM (W/ MULTI-DISPLAY)DTC B15BB: MULTI-MEDIA INTERFACE ECU MALFUNCTIONPROCEDURE
2010 Lexus LS 460L AWD

DTC B15BB: Multi-media Interface ECU Malfunction: Procedure

2010 Lexus LS 460L AWDSECTION Procedure
  1. REPLACE "iPod" OR USB DEVICE 
    1. Disconnect the USB device or "iPod" from the No. 1 stereo jack adapter assembly.
    2. Turn the engine switch off.

      HINT: 

      When this DTC has been stored, it is necessary to turn off the engine switch to make it possible for the vehicle to recognize a new device when it is connected.

    3. Turn the engine switch on (ACC).
    4. Connect a known good USB device or "iPod" to the No. 1 stereo jack adapter assembly.

      HINT: 

      If the malfunction occurred when a USB device was in use, use another USB device for the inspection. If the malfunction occurred when an "iPod" was in use, use another "iPod" for the inspection.

    NEXT: Go to next step 

  2. CHECK FOR DTC 
    1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
    2. Check for DTCs and check if the same trouble occurs again.

      OK

      No DTC is output.

    NG → See step   3 

    OK → USB DEVICE OR "iPod" WAS DEFECTIVE 

  3. CHECK MULTI-MEDIA INTERFACE ECU 
    1. Disconnect the L128 No. 1 stereo jack adapter assembly connector.
      Fig 1: Identifying L128 No. 1 Stereo Jack Adapter Assembly Connector
      GTY254717Courtesy 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
      L128-1 (UPI) - L128-4 (UJSG) Always 5 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to No. 1 Stereo Jack Adapter Assembly)

    NG → See step   5 

    OK → See step   4 

  4. REPLACE NO. 1 STEREO JACK ADAPTER ASSEMBLY. Refer to  REMOVAL 
  5. CHECK HARNESS AND CONNECTOR (NO. 1 STEREO JACK ADAPTER - MULTI-MEDIA INTERFACE ECU) 
    1. Disconnect the L128 No. 1 stereo jack adapter assembly connector.
    2. Disconnect the h1 multi-media interface ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L128-1 (UPI) - h1-1 (UPO) Always Below 1 Ω
      L128-4 (UJSG) - h1-4 (UESG) Always Below 1 Ω
      L128-1 (UPI) - Body ground Always 10 kΩ or higher
      L128-4 (UJSG) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   6 

  6. REPLACE MULTI-MEDIA INTERFACE ECU. Refer to  REMOVAL 
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.