Mute Signal Circuit between Navigation Receiver Assembly and Stereo Component Amplifier [11/2013 - 10/2015]: Procedure

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   M22-1 (MUTE) - Body ground	Ignition switch ACC, audio system playing→ Changing modes	Above 3.5 V→ Below 1 V

   Result	Proceed to
   	OK
   	NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2013 - 10/2015]  . 

Result: 

NG 

See step  2

1. Disconnect the G143 navigation receiver assembly connector.
2. Disconnect the M22 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
   G143-16 (MUT1) - M22-1 (MUTE)	Always	Below 1 Ω
   G143-16 (MUT1) - Body ground	Always	10 kΩ or higher

   Result	Proceed to
   	OK
   	NG

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

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   G143-16 (MUT1) - Body ground	Ignition switch ACC, audio system playing→ Changing modes	Above 3.5 V→ Below 1 V

   Result	Proceed to
   	OK
   	NG

Result: 

OK 

REPLACE NAVIGATION RECEIVER ASSEMBLY. Refer to  REMOVAL [11/2013 - 10/2015]  . 

Result: 

NG 

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to  REMOVAL [12/2012 - 10/2015]  .