Sound Signal Circuit between Radio Receiver and Multi-media Interface ECU: Procedure

1. Disconnect the radio receiver assembly and multi-media interface ECU connectors.
   Fig 1: J98 And J99 Connector Terminal Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.
   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   J99-1 (USD1) - J98-1 (CSLD)	Always	Below 1 Ω
   J99-2 (URO+) - J98-2 (CDR+)	Always	Below 1 Ω
   J99-3 (URO-) - J98-3 (CDR-)	Always	Below 1 Ω
   J99-4 (ULO+) - J98-4 (CDL+)	Always	Below 1 Ω
   J99-5 (ULO-) - J98-5 (CDL-)	Always	Below 1 Ω
   J99-1 (USD1) - Body ground	Always	10 kΩ or higher
   J99-2 (URO+) - Body ground	Always	10 kΩ or higher
   J99-3 (URO-) - Body ground	Always	10 kΩ or higher
   J99-4 (ULO+) - Body ground	Always	10 kΩ or higher
   J99-5 (ULO-) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   2