Mute Signal Circuit between Navigation Receiver Assembly and Stereo Component Tuner Assembly: Procedure

1. Measure the voltage according to the value(s) in the table below.
   Fig 1: Identifying L15 Connector Terminal

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   Standard Voltage

   Tester Connection	Condition	Specified Condition
   L15-6 (MUTE) - Body ground	Power switch on (ACC), Satellite radio playing → Changing source	Above 3.5 V → Below 1 V

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   *1	Component with harness connected (Stereo Component Tuner Assembly)

NG → See step   2 

OK → See step   4 

1. Disconnect the L38 navigation receiver assembly connector.
   Fig 2: Identifying L38 Navigation Receiver Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the L15 stereo component tuner assembly connector.
   Fig 3: Identifying L15 Stereo Component Tuner Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L38-6 (MUTE) - L15-6 (MUTE)	Always	Below 1 Ω
   L38-6 (MUTE) - Body ground	Always	10 kΩ or higher

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   *1	Front view of wire harness connector (to Navigation Receiver Assembly)
   *2	Front view of wire harness connector (to Stereo Component Tuner Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the stereo component tuner assembly and check if it operates normally. Refer to REMOVAL .

   OK

   The navigation system operates normally.

NG → See step   5 

OK → END