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

1. Disconnect the navigation computer sub-assembly*1 connector or display and navigation module display*2 connector and multi-media interface ECU assembly connector.
   • *1: w/ Navigation System (for HDD)
   • *2: w/ Navigation System (for DVD)
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H64-1 (AGND) - H69-1 (USD1)	Always	Below 1 Ω
   H64-3 (VAR+) - H69-2 (URO+)	Always	Below 1 Ω
   H64-4 (VAL+) - H69-3 (ULO+)	Always	Below 1 Ω
   H64-7 (VA-) - H69-4 (UGD1)	Always	Below 1 Ω
   H64-1 (AGND) - Body ground	Always	10 kΩ or higher
   H64-3 (VAR+) - Body ground	Always	10 kΩ or higher
   H64-4 (VAL+) - Body ground	Always	10 kΩ or higher
   H64-7 (VA-) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   2