Inspection Procedure

1. Enter diagnostic mode.
   Fig 1: Service Check Mode Flow Chart - Diagnostic Mode

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

   HINT:

   • "P190" set by the radio receiver is shown in the preceding illustration as an example.
   • For details of the DTC display, refer to DTC CHECK / CLEAR  .

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.

   HINT:

   The "Bluetooth" handsfree module is built into the radio receiver.

   Component Table 

   COMPONENT REFERENCE CHART
   
   

   Component	Proceed to
   Radio receiver (190)	Radio receiver power source circuit (See RADIO RECEIVER POWER SOURCE CIRCUIT  )

1. Disconnect the radio receiver connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   RESISTANCE SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   E40-5 (ATX+) - E40-15 (ATX-)	Always	60 to 80 Ω

   Fig 2: Identifying E40 Radio Receiver Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   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  .

1. Referring to the following AVC-LAN Wiring Diagram, check the AVC-LAN circuit between the stereo component amplifier and the component shown by the sub-code.
   1. Disconnect all connectors between the stereo component amplifier and the component shown by the sub-code.
   2. Check for an open or short in the AVC-LAN circuit between the stereo component amplifier and the component shown by the sub-code.
      Fig 3: AVC-LAN Wiring Diagram

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: 

      There is no open or short circuit  .

      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: 

   Malfunction disappears  .

   NG: REPLACE STEREO COMPONENT AMPLIFIER  (See REMOVAL  )

   OK: END