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: Radio Receiver Assembly And Multi-Media Interface ECU Connectors

   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
   U9-1 (USD1) - G11-1 (CSLD)	Always	Below 1 Ω
   U9-2 (URO+) - G11-2 (CDR+)	Always	Below 1 Ω
   U9-3 (ULO+) - G11-3 (CDR-)	Always	Below 1 Ω
   U9-4 (UGD1) - G11-4 (CDL+)	Always	Below 1 Ω
   U9-5 (ULO-) - G11-5 (CDL-)	Always	Below 1 Ω
   U9-1 (USD1) - Body ground	Always	10 kΩ or higher
   U9-2 (URO+) - Body ground	Always	10 kΩ or higher
   U9-3 (ULO+) - Body ground	Always	10 kΩ or higher
   U9-4 (UGD1) - Body ground	Always	10 kΩ or higher
   U9-5 (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