Inspection Procedure

1. Disconnect the R31 controller connector
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.
   Fig 1: Identifying R31 Controller Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Signal waveform 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   R31-9 (TVL+) - Body ground	Audio sound is being produced	A waveform synchronized with sound is output
   R31-7 (TVR+) - Body ground

NG: Go to step 2 

OK: REPLACE MULTI-DISPLAY CONTROLLER  (See REMOVAL  )

1. Disconnect the L78*1 or Y3*2 terminal connector.
2. Disconnect the R31 controller connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance: 

   w/ Ottoman 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   L78-1 (VAR+) - R31-7 (TVR+)	Always	Below 1 Ω
   L78-2 (VAL+) - R31-9 (TVL+)
   L78-3 (VA-) - R31-11 (SLDE)
   L78-8 (ADPG) - R31-6 (ADPI)
   R31-7 (TVR+) - Body ground	Always	10 kΩ or higher
   R31-9 (TVL+) - Body ground
   R31-11 (SLDE) - Body ground
   R31-6 (APDI) - Body ground

   Fig 2: Checking Harness And Connector (Video Terminal - Multi-Display Controller)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   w/o Ottoman 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   Y3-1 (VAR+) - R31-7 (TVR+)	Always	Below 1 Ω
   Y3-2 (VAL+) - R31-9 (TVL+)
   Y3-3 (VA-) - R31-11 (SLDE)
   Y3-8 (ADPG) - R31-6 (ADPI)
   R31-7 (TVR+) - Body ground	Always	10 kΩ or higher
   R31-9 (TVL+) - Body ground
   R31-11 (SLDE) - Body ground
   R31-6 (APDI) - Body ground

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   OK (for Standard)	A
   OK (for Ottoman)	B
   NG	C

B: REPLACE VIDEO TERMINAL  (See REMOVAL  )

C: REPAIR OR REPLACE HARNESS OR CONNECTOR 

A: REPLACE VIDEO TERMINAL  (See REMOVAL  )