DTC B15BB: Multi-media Interface ECU Malfunction: Procedure

1. Disconnect the USB device or "iPod" from the stereo jack adapter.
2. Turn the engine switch off.

   HINT: 

   When one of these DTCs has been stored, 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 stereo jack adapter.

   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 

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

   OK

   No DTCs are output.

NG → See step   3 

OK → USB DEVICE OR "iPod" WAS DEFECTIVE 

1. Disconnect the L128 No. 1 stereo jack adapter assembly connector.
   Fig 1: Identifying L128 No. 1 Stereo Jack Adapter Assembly Connector Terminals

   Courtesy 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   4 

OK → See step   5 

1. Disconnect the h1 multi-media interface ECU connector.
2. Disconnect the L128 No. 1 stereo jack adapter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   6