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: Checking Telematics Transceiver

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   D73-17 (MUTE) - Body ground	Ignition switch ACC, audio system is playing → Emergency call mode	Above 3.5 V → Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *1	Component with harness connected (Telematics Transceiver)

NG → See step   2 

OK → See step   4 

1. Disconnect the L5 stereo component amplifier assembly connector.
2. Disconnect the D73 telematics transceiver connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L5-24 (TMUT) - D73-17 (MUTE)	Always	Below 1 Ω
   L5-24 (TMUT) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the L5 stereo component amplifier assembly connector.
2. Measure the voltage according to the value(s) in the table below.
   Fig 2: Checking Stereo Component Amplifier Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   L5-24 (TMUT) - Body ground	Ignition switch ACC	3.5 V or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Stereo Component Amplifier Assembly)

NG → See step   6 

OK → See step   5