Inspection Procedure

1. Enter the diagnostic mode.
2. Press the "LAN Mon" switch to change to "LAN Monitor" mode.
3. Identify the component shown by the sub-code.

   HINT:

   • "110 (multi-display)" is the component shown by the sub-code in the example shown in the illustration.
   • The sub-code will be indicated by its physical address.
   • For the component list, refer to "DIAGNOSIS DISPLAY DETAILED DESCRIPTION " .
     Fig 1: Radio Receiver Communication Error Screen Display

     Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NEXT 

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 CHART
   
   

   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
   Multi-display (110)	Multi-display power source circuit (see MULTI-DISPLAY POWER SOURCE CIRCUIT  )
   Navigation ECU (178)	Navigation ECU power source circuit (see NAVIGATION ECU POWER SOURCE CIRCUIT  )

NEXT 

1. Disconnect the R5 and R6 receiver connectors.
2. Measure the resistance of the receiver.

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   R6-5 (TX+) - R6-15 (TX-)	60 to 80 Ω
   R5-9 (TX+) - R5-10 (TX-)	60 to 80 Ω

NG : REPLACE RADIO RECEIVER ASSEMBLY 

Fig 2: Inspecting Radio Receiver Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 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 is no open or short circuit. 

      Fig 3: AVC-LAN Wiring Diagram

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS AND 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 

OK : END