DTC B15BB: Multi-media Interface ECU Malfunction: Procedure

1. Disconnect the USB device or "iPod" from the No. 1 stereo jack adapter assembly.
2. Turn the ignition switch off.

   HINT: 

   When one of these DTCs has been stored, is necessary to turn off the ignition switch to make it possible for the vehicle to recognize a new device when it is connected.

3. Turn the ignition switch to 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 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR .

NEXT: Go to next step 

1. Recheck DTCs and check if the same DTC occurs again.

   OK

   Malfunction disappears.

NG → See step   4 

OK → USB DEVICE OR "iPod" WAS DEFECTIVE 

1. Disconnect the D128 No. 1 stereo jack adapter assembly connector.
   Fig 1: Measuring Resistance Of Multi-Media Interface ECU

   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
   D128-1 - D128-4	Always	5 V

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   6 

OK → See step   5 

1. Disconnect the D129 multi-media interface ECU connector.
2. Disconnect the D128 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
   D129-1 - D128-1	Always	Below 1 Ω
   D129-4 - D128-4	Always	Below 1 Ω
   D129-1 - Body ground	Always	10 kΩ or higher
   D129-4 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   7