Inspection Procedure

1. Enter the diagnostic mode.
2. Press the "LAN Mon" switch to change to "LAN Monitor" mode.
3. Identify the component which has stored this 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 details of the DTC display, refer to "DIAGNOSIS DISPLAY DETAILED DESCRIPTION " .
     Fig 1: Identifying Component Which Has Stored Code

     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 REFERENCE CHART
   
   

   Component	Proceed to
   Gateway ECU (1C6)	GATEWAY ECU POWER SOURCE CIRCUIT
   Stereo component amplifier (440)	STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT
   Multi-display (110)	MULTI-DISPLAY POWER SOURCE CIRCUIT

NEXT 

1. for 9 Speaker System:

   Disconnect the R5 and R6 receiver connectors.

2. for 6 Speaker System:

   Disconnect the R5 receiver connector.

3. Measure the resistance of the receiver.

   Standard resistance 

   RESISTANCE AND RECEIVER CONDITION SPECIFICATION
   
   

   Tester Connection	Specified Condition
   R5--9 (TX1+) - R5--10 (TX1-)* 1	60 to 80 Ω
   R5--9 (TX+) - R5--10 (TX-)* 2	60 to 80 Ω
   R6-5 (TX+) - R6--15 (TX-)* 2	60 to 80 Ω

   HINT:

   • ^* 1: for 6 speaker system
   • ^* 2: for 9 speaker system

NG : REPLACE RADIO RECEIVER 

Fig 2: Inspecting Radio Receiver

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 the "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: Radio Receiver Communication Error - 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 

OK : GO TO NEXT STEP 

END