Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier [08/2015 - ]: Procedure

1. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   I69-1 (MUTE) - Body ground	Ignition switch ACC Audio system playing → Audio system changing modes	2.0 V or higher → Below 1 V

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   2 

OK → See step   5 

1. Disconnect the I67 radio and display receiver assembly connector.
2. Disconnect the I69 stereo component amplifier assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I67-16 (MUT1) - I69-1 (MUTE)	Always	Below 1 Ω
   I67-16 (MUT1) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the I67 radio and display receiver assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   I67-16 (MUT1) - Body ground	Ignition switch ACC Audio system playing	2.0 V or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Radio and Display Receiver Assembly)

NG → See step   4 

OK → See step   6