Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier: Procedure

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   STANDARD VOLTAGE
   
   

   Tester Connection	Condition	Specified Condition
   P30-1 (MUTE) - Body ground	Engine switch on (ACC), audio system is playing → Changing sources	Above 2.5 V → Below 0.5 V

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   2 

OK → See step   4 

1. Disconnect the radio receiver assembly and stereo component amplifier assembly connectors.
   Fig 2: J95 And P30 Connector Terminal Identification

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

   Tester Connection	Condition	Specified Condition
   J95-7 (MUTE) - P30-1 (MUTE)	Always	Below 1 Ω
   J95-7 (MUTE) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the stereo component amplifier assembly connector.
   Fig 3: J95 Connector Terminal Identification

   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
   J95-7 (MUTE) - Body ground	Engine switch on (ACC), audio system is playing	Above 2.5 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Radio Receiver Assembly)

NG → See step   6 

OK → See step   5