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: Inspecting Stereo Component Tuner Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   E30-6 (MUTE) - Body ground	Ignition switch ACC, Satellite radio playing → Changing modes	Above 3.5 V → Below 1 V

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   2 

OK → See step   4 

1. Disconnect the E32 multi-media interface ECU connector.
2. Disconnect the E30 stereo component tuner assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E32-14 (MUT2) - E30-6 (MUTE)	Always	Below 1 Ω
   E32-14 (MUT2) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the stereo component tuner assembly and check that the malfunction disappears, refer to REMOVAL .

   OK

   Malfunction disappears.

NG → See step   5 

OK → END (STEREO COMPONENT TUNER ASSEMBLY IS DEFECTIVE)