Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier [08/2015 - 08/2021]: 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
   H22-1 (MUTE) - Body ground	Engine switch on (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)

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

(Refer to PROBLEM SYMPTOMS TABLE [08/2015 - 08/2019] , or refer to PROBLEM SYMPTOMS TABLE [08/2019 - 08/2021] )

Result: 

NG 

See step  2

1. Disconnect the H3 multi-media module receiver assembly connector.
2. Disconnect the H22 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
   H3-16 (MUT1) - H22-1 (MUTE)	Always	Below 1 Ω
   H3-16 (MUT1) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

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
   H3-16 (MUT1) - Body ground	Engine switch on (ACC) Audio system playing	2.0 V or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Multi-media Module Receiver Assembly)

Result: 

OK 

REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY 

(Refer to REMOVAL [08/2015 - 08/2021] )

Result: 

NG 

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY