Mute Signal Circuit between Disc Player Changer and Television Display Assembly: Procedure

1. Disconnect the U1 television display assembly connector.
2. Measure the voltage according to the value(s) in the table below.
   Fig 1: Checking Television Display Assembly Voltage

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   U1-4 (MUT1) - Body ground	Turn the ignition switch to ACC, disc player assembly is playing → Changing modes	3.5 V or higher → Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Television Display Assembly)

NG → See step   2 

OK → See step   3 

1. Disconnect the D70 disc player assembly connector.
2. Disconnect the U1 television display assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D70-6 (MUT2) - U1-4 (MUT1)	Always	Below 1 Ω
   D70-6 (MUT2) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4