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

1. Disconnect the L118 display and navigation module display connector.
2. Disconnect the R65 multi-media interface ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L118-1 (AGND) - R65-1 (USD1)	Always	Below 1 Ω
   L118-3 (VAR+) - R65-2 (URO+)	Always	Below 1 Ω
   L118-4 (VAL+) - R65-3 (ULO+)	Always	Below 1 Ω
   L118-7 (VA-) - R65-4 (UGD1)	Always	Below 1 Ω
   L118-1 (AGND) - Body ground	Always	10 kΩ or higher
   L118-3 (VAR+) - Body ground	Always	10 kΩ or higher
   L118-4 (VAL+) - Body ground	Always	10 kΩ or higher
   L118-7 (VA-) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   2