Inspection Procedure

1. Enter the diagnostic mode.
   Fig 1: Service Check Mode And Detailed Information Mode Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Press the preset switch "3" to change to "Detailed Information Mode".
3. Identify the component shown by the sub-code.

   HINT.

   • "190 (radio receiver)" is the component shown by the subcode in the example shown in the illustration.
   • For details of the DTC display, refer to DTC CHECK / CLEAR (See )

1. Inspect the power source circuit of the component shown by the sub-code.

   If the power source circuit is operating normally, proceed to the next step.

   Component Table 

   COMPONENT TABLE
   
   

   Component	Proceed to
   Gateway ECU (1C6)	Gateway ECU power source circuit (See GATEWAY ECU POWER SOURCE CIRCUIT  )
   Stereo component amplifier (440)	Stereo component amplifier power source circuit (See STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT  )
   Integration control & panel assembly (1D8)	Integration control & panel assembly power source circuit (See INTEGRATION CONTROL AND PANEL ASSEMBLY POWER SOURCE CIRCUIT  )

1. Disconnect the radio receiver connectors.
   Fig 2: Identifying Radio Receiver Connectors

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

   Standard Resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   J66-5 (ATX+) - J66-15 (ATX-)	Always	60 to 80 Ω
   J65-9 (TXM+) - J65-10 (TXM-)	Always	60 to 80 Ω
   J63-9 (TX+) - J63-10 (TX-)	Always	60 to 80 Ω

NG: REPLACE RADIO RECEIVER  (See REMOVAL  )

OK: Go to next step 

HINT:

• Start the check from the circuit that is near the component shown by the sub-code first.
• For details of the connectors, refer to TERMINALS OF ECU (See )

1. Referring to AVC-LAN Wiring Diagram below, check the AVC-LAN circuit between the radio receiver and the component shown by the sub-code.
   1. Disconnect all connectors between the radio receiver and the component shown by sub-code
   2. Check for an open or short in the AVC-LAN circuit between the radio receiver and the component shown by the sub-code.

      OK: There are no open or short circuits. 

      Fig 3: AVC-LAN - Wiring Diagram

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the component shown by the sub-code with a known good one and check if the same problem occurs again

   OK: Same problem does not occur. 

NG: REPLACE RADIO RECEIVER  (See REMOVAL  )

OK: END