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
   Integration control & panel assembly (1D8)	Integration control & panel assembly power source circuit (See INTEGRATION CONTROL AND PANEL ASSEMBLY POWER SOURCE CIRCUIT  )
   Stereo component amplifier (440)	Stereo component amplifier power source circuit (See STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT  )
   Radio receiver (190)	Radio receiver power source circuit (See RADIO RECEIVER 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 gateway ECU and the component shown by the sub-code.
   1. Disconnect all connectors between the gateway ECU and the component shown by sub-code
   2. Check for an open or short in the AVC-LAN circuit between the gateway ECU 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 GATEWAY ECU  (See NETWORK GATEWAY ECU )

OK: END