Inspection Procedure

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

   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 DTC CHECK/CLEAR  ).

1. Select the component which has stored this code.

   HINT:

   The "Bluetooth" handsfree module is built into the radio receiver assembly. If there is a problem between the "Bluetooth" handsfree module and radio receiver assembly, replace the radio receiver assembly.

   Component Table 

   COMPONENT REFERENCE
   
   

   Component	Proceed to
   Except "Bluetooth" handsfree module	A
   "Bluetooth" handsfree module	B

B: REPLACE RADIO RECEIVER ASSEMBLY  (See REMOVAL  )

A: Go to next step 

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

   HINT:

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

   Component Table 

   COMPONENT REFERENCE
   
   

   Component	Proceed to
   Stereo component amplifier (440)	Stereo Component Amplifier Power Source Circuit (See STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT  )
   Television display (1B0)*	Television Display Assembly Power Source Circuit (See TELEVISION DISPLAY POWER SOURCE CIRCUIT  )
   HINT: *: w/ Rear Seat Entertainment System

1. Disconnect the I4 and I8* radio receiver assembly connectors.

   HINT:

   *: w/ Rear Seat Entertainment System

2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   I4-5 (ATX+) - I4-15 (ATX-)	Always	60 to 80 Ω
   I8-9 (TXM+) - I8-10 (TXM-)*	Always	60 to 80 Ω
   HINT: *: w/ Rear Seat Entertainment System

3. Reconnect the radio receiver assembly connectors.

NG: REPLACE RADIO RECEIVER ASSEMBLY  (See REMOVAL  )

Fig 2: Identifying Radio Receiver Assembly Connector Terminals

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OK: Go to next step 

Fig 3: AVC-LAN - Wiring Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 TERMINALS OF ECU  ).

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

      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 normal one and check if the same problem occurs again.

   OK: Same problem does not occur. 

NG: REPLACE RADIO RECEIVER ASSEMBLY  (See REMOVAL  )

OK: END