Mute Signal Circuit between Navigation Receiver Assembly and Stereo Component Amplifier: Procedure

1. Measure the voltage according to the value(s) in the table below.
   Fig 1: Inspecting E20 Stereo Component Amplifier Assembly Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   E20-1 (MUTE) - Body ground	Ignition switch ACC, Audio system playing → Changing source	Above 3.5 V → 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 E52 navigation receiver assembly connector.
2. Disconnect the E20 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
   E52-7 (MUTE) - E20-1 (MUTE)	Always	Below 1 Ω
   E52-7 (MUTE) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the E20 stereo component amplifier assembly connector.
   Fig 2: Inspecting E20 Stereo Component Amplifier Assembly Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   E20-1 (MUTE) - Body ground	Ignition switch ACC Audio system playing	Above 3.5 V

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   6 

OK → See step   4