Sound Signal Circuit Between Navigation Receiver Assembly And Stereo Component Amplifier: Procedure

1. Disconnect the L5 stereo component amplifier assembly connector.
   Fig 1: Checking Stereo Component Amplifier Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Using an oscilloscope, check the signal waveform between each terminal and the body ground according to the conditions, as shown in the chart below.

   OK

   Tester Connection	Condition	Specified Condition
   L5-5 (R+) - Body ground	Audio sound is being produced	A waveform synchronized with sound is output
   L5-4 (R-) - Body ground
   L5-3 (L+) - Body ground
   L5-2 (L-) - Body ground

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Stereo Component Amplifier Assembly)

NG → See step   2 

OK → See step   3 

1. Disconnect the D52 navigation receiver assembly connector.
2. Disconnect the L5 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
   D52-8 (R+) - L5-5 (R+)	Always	Below 1 Ω
   D52-18 (R-) - L5-4 (R-)	Always	Below 1 Ω
   D52-9 (L+) - L5-3 (L+)	Always	Below 1 Ω
   D52-19 (L-) - L5-2 (L-)	Always	Below 1 Ω
   D52-10 (SGND) - Body ground	Always	10 kΩ or higher
   D52-8 (R+) - Body ground	Always	10 kΩ or higher
   D52-18 (R-) - Body ground	Always	10 kΩ or higher
   D52-9 (L+) - Body ground	Always	10 kΩ or higher
   D52-19 (L-) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4