Mute Signal Circuit between Stereo Component Amplifier and Telematics Transceiver: Procedure

1. Measure the voltage according to the value(s) in the table below.
   Fig 1: J101 Connector Terminal Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   STANDARD VOLTAGE
   
   

   Tester Connection	Condition	Specified Condition
   J101-17 (MUTE) - Body ground	Engine switch on (ACC), audio system is playing → Emergency call mode	Above 3.5 V → Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *1	Component with harness connected (DCM (Telematics Transceiver))

NG → See step   2 

OK → See step   4 

1. Disconnect the stereo component amplifier assembly and DCM (telematics transceiver) connectors.
2. Measure the resistance according to the value(s) in the table below.
   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   P30-24 (TMUT) - J101-17 (MUTE)	Always	Below 1 Ω
   P30-24 (TMUT) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the stereo component amplifier assembly connector.
2. Measure the voltage according to the value(s) in the table below.
   Fig 2: J101 Connector Terminal Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   STANDARD VOLTAGE
   
   

   Tester Connection	Condition	Specified Condition
   J101-17 (MUTE) - Body ground	Engine switch on (ACC)	Above 3.5 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to DCM (Telematics Transceiver))

NG → See step   6 

OK → See step   5