Sound Signal Circuit between Headphone Terminal and Television Display: Procedure

1. Disconnect the S1 headphone terminal RH connector.
   Fig 1: Checking Headphone Terminal With S1 & O1 Connector End View

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the O1 headphone terminal LH connector.
3. Using an oscilloscope, check the signal waveform between each terminal and the body ground according to the conditions, as shown in the chart below.

   Signal Waveform

   FOR RH SIDE
   
   

   Tester Connection	Condition	Specified Condition
   S1-1 (HP2R) - Body ground	Audio sound is being produced	A waveform synchronized with sound is output
   S1-2 (HP2L) - Body ground

   FOR LH SIDE
   
   

   Tester Connection	Condition	Specified Condition
   O1-1 (HP1R) - Body ground	Audio sound is being produced	A waveform synchronized with sound is output
   O1-2 (HP1L) - Body ground

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Headphone Terminal RH)
   *2	Front view of wire harness connector (to Headphone Terminal LH)
   *a	for RH Side
   *b	for LH Side

   RESULT
   
   

   Result	Proceed to
   NG	A
   OK (Headphone terminal RH is abnormal)	B
   OK (Headphone terminal LH is abnormal)	C

B → See step   3 

C → See step   4 

A: Go to next step 

1. Disconnect the U2 television display assembly connector.
2. Disconnect the S1 or O1 headphone terminal connector(s).
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   FOR RH SIDE
   
   

   Tester Connection	Condition	Specified Condition
   U2-8 (HP2R) - S1-1 (HP2R)	Always	Below 1 Ω
   U2-6 (HP2L) - S1-2 (HP2L)	Always	Below 1 Ω
   U2-7 (SLD2) - S1-3 (SGN2)	Always	Below 1 Ω
   U2-8 (HP2R) - Body ground	Always	10 kΩ or higher
   U2-6 (HP2L) - Body ground	Always	10 kΩ or higher
   U2-7 (SLD2) - Body ground	Always	10 kΩ or higher

   FOR LH SIDE
   
   

   Tester Connection	Condition	Specified Condition
   U2-16 (HP1R) - O1-1 (HP1R)	Always	Below 1 Ω
   U2-14 (HP1L) - O1-2 (HP1L)	Always	Below 1 Ω
   U2-15 (SLD1) - O1-3 (SGN1)	Always	Below 1 Ω
   U2-16 (HP1R) - Body ground	Always	10 kΩ or higher
   U2-14 (HP1L) - Body ground	Always	10 kΩ or higher
   U2-15 (SLD1) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   5