Mute Signal Circuit Between Stereo Component Tuner Assembly And Multi-Media Interface ECU: Procedure

1. Measure the voltage according to the value(s) in the table below.
   Fig 1: Checking Stereo Component Tuner Assembly

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   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   L20-6 (MUTE) - Body ground	Ignition switch ACC, Satellite radio playing → Changing source	Above 3.5 V → Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *1	Component with harness connected (Stereo Component Tuner Assembly)

NG → See step   3 

OK: Go to next step 

1. Disconnect the L20 stereo component tuner assembly connector.
2. Disconnect the D67 multi-media interface ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L20-6 (MUTE) - D67-14 (MUT2)	Always	Below 1 Ω
   L20-6 (MUTE) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4