Multi-media Interface ECU Power Source Circuit: Procedure

1. Disconnect the multi-media interface ECU connector.
2. Measure the voltage according to the value(s) in the table below.
   Fig 1: Identifying J99 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Multi-media Interface ECU)

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   J99-12 (+B) - J99-7 (GND)	Always	11 to 14 V
   J99-11 (ACC) - J99-7 (GND)	Engine switch on (ACC)	11 to 14 V

NG → See step   3 

OK → See step   2 

1. Disconnect the radio receiver assembly connector.
2. Measure the resistance according to the value(s) in the table below.
   Fig 2: Identifying J98 And J99 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Multi-media Interface ECU)
   *2	Front view of wire harness connector (to Radio Receiver Assembly)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J99-11 (ACC) - J98-11 (ACC)	Always	Below 1 Ω
   J99-12 (+B) - J98-12 (+B)	Always	Below 1 Ω
   J99-7 (GND) - J98-7 (GND)	Always	Below 1 Ω
   J99-11 (ACC) - Body ground	Always	10 kΩ or higher
   J99-12 (B+) - Body ground	Always	10 kΩ or higher
   J99-7 (GND) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   2