Mute Signal Circuit between Navigation Receiver Assembly and Stereo Component Amplifier [08/2017 - 08/2019]: Procedure

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   H162-1 (MUTE) - Body ground	Ignition switch ACC, audio system playing → Changing modes	Approximately 3.5 V → 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 [08/2017 - 08/2019] )

Result: 

NG 

See step  2

1. Disconnect the H158 navigation receiver assembly connector.
2. Disconnect the H162 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
   H158-16 (MUT1) - H162-1 (MUTE)	Always	Below 1 Ω
   H158-16 (MUT1) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Disconnect the navigation 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	Switch Condition	Specified Condition
   H158-16 (MUT1) - Body ground	Ignition switch ACC, audio system is playing	Approximately 3.5 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Navigation Receiver Assembly)

Result: 

OK 

REPLACE NAVIGATION RECEIVER ASSEMBLY 

(Refer to REMOVAL [08/2015 - 08/2019] )

Result: 

NG 

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY 

(Refer to REMOVAL [08/2017 - 08/2019] )