Mute Signal Circuit between Navigation Receiver Assembly and Stereo Component Amplifier [08/2014 - ]: Procedure

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   L5-1 (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 D153 navigation receiver assembly connector.
2. Disconnect the L5 stereo component amplifier assembly connector.
3. Measure the resistance according to the value(s) in the chart below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D153-16 (MUT1) - L5-1 (MUTE)	Always	Below 1 Ω
   D153-16 (MUT1) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the navigation receiver assembly connector.
2. Measure the voltage according to the value(s) in the chart below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   D153-16 (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 Navigation Receiver Assembly)

NG → See step   4 

OK → See step   6