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

1. Disconnect the E53 navigation receiver assembly connector.
2. Disconnect the E41 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
   E53-2 (CDR+) - E41-2 (URO+)	Always	Below 1 Ω
   E53-3 (CDR-) - E41-3 (URO-)	Always	Below 1 Ω
   E53-4 (CDL+) - E41-4 (ULO+)	Always	Below 1 Ω
   E53-5 (CDL-) - E41-5 (ULO-)	Always	Below 1 Ω
   E53-2 (CDR+) - Body ground	Always	10 kΩ or higher
   E53-3 (CDR-) - Body ground	Always	10 kΩ or higher
   E53-4 (CDL+) - Body ground	Always	10 kΩ or higher
   E53-5 (CDL-) - Body ground	Always	10 kΩ or higher
   E41-1 (USD1) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the E41 multi-media interface ECU connector.
   Fig 1: Checking E41 Multi-Media Interface ECU Connector Terminals

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2. Check the waveform according to the conditions in the table below.

   Standard

   Tester Connection	Condition	Specified Condition
   E41-2 (URO+) - Body ground	Sound being produced	A waveform synchronized with sound is output
   E41-3 (URO-) - Body ground	Sound being produced	A waveform synchronized with sound is output
   E41-4 (ULO+) - Body ground	Sound being produced	A waveform synchronized with sound is output
   E41-5 (ULO-) - Body ground	Sound being produced	A waveform synchronized with sound is output

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Multi-media Interface ECU)

NG → See step   4 

OK → See step   3