Sound Signal Circuit between Multi-display Controller and Navigation Assembly: Procedure

1. Disconnect the F34 navigation connector.
   Fig 1: Identifying F34 Navigation Connector And L23 Selector Connector Terminals

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2. Disconnect the L23 selector connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F34-3 (FL+) - L23-3 (L5+)	Always	Below 1 Ω
   F34-4 (FL-) - L23-4 (L5-)
   F34-1 (FR+) - L23-1 (R5+)
   F34-2 (FR-) - L23-2 (R5-)
   F34-3 (FL+) - Body ground	Always	10 kΩ or higher
   F34-4 (FL-) - Body ground
   F34-1 (FR+) - Body ground
   F34-2 (FR-) - Body ground
   F34-5 (SLD1) - Body ground

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the F34 navigation connector.
   Fig 2: Identifying F34 Navigation Connector Terminals

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2. Using an oscilloscope, check the signal waveform between each terminal and body ground according to the conditions shown in the chart below.

   Signal Waveform

   Tester Connection	Condition	Specified Condition
   L23-3 (L5+) - Body ground	Audio sound is being produced	A waveform synchronized with sound is output
   L23-4 (L5-) - Body ground
   L23-1 (R5+) - Body ground
   L23-2 (R5-) - Body ground

NG → See step   4 

OK → See step   3