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

1. Measure the voltage according to the value(s) in the table below.
   Fig 1: Identifying Stereo Component Amplifier Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   F19-1 (MUTE) - Body ground	Ignition switch ACC, Audio system playing → Changing source	Above 3.5 V → Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *1	Component with harness connected (Stereo Component Amplifier)

NG → See step   2 

OK → See step   5 

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the stereo component amplifier connector.
   Fig 3: Identifying Stereo Component Amplifier 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
   F9-7 (MUTE) - F19-1 (MUTE)	Always	Below 1 Ω
   F9-7 (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 Amplifier)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the stereo component amplifier connector.
   Fig 4: Identifying stereo component amplifier connector

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   F19-1 (MUTE) - Body ground	Ignition switch ACC Audio system playing	Above 3.5 V

   TEXT IN ILLUSTRATION
   
   

   *1	Component with harness connected (Stereo Component Amplifier)

NG → See step   6 

OK → See step   4