Radio and Navigation Assembly Communication Error

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 Fig 1 .
   • The sub-code will be indicated by its physical address.
   • For the component list, refer to "DIAGNOSIS DISPLAY DETAILED DESCRIPTION " .
     Fig 1: Identifying LAN Monitor Mode

     Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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: 

   POWER SOURCE CIRCUIT OF COMPONENT SHOWN BY SUB-CODE
   
   

   Component	Proceed to
   Television display assembly (1B0)	Television display assembly power source circuit (See TELEVISION DISPLAY POWER SOURCE CIRCUIT  )
   Stereo component amplifier (440)	Stereo component amplifier power source circuit (See STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT  )

1. Disconnect the radio and navigation assembly.
2. Measure the resistance according to the value(s) in RADIO AND NAVIGATION ASSEMBLY  .

   Standard resistance 

   RADIO AND NAVIGATION ASSEMBLY
   
   

   Tester Connection	Condition	Specified Condition
   ATX+ (R15-5) - ATX- (R15-15)	Always	60 to 80 Ω
   TX+ (R14-9) - TX- (R14-10)	Always	60 to 80 Ω

   Fig 2: Checking Radio And Navigation Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE RADIO AND NAVIGATION ASSEMBLY 

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 in Fig 3, check the AVC-LAN circuit between the radio and navigation assembly and the component shown by the sub-code.
   1. Disconnect all connectors between the radio and navigation assembly and the component shown by sub-code.
   2. Check for an open or short in the AVC-LAN circuit between the radio and navigation assembly and the component shown by the sub-code.
      Fig 3: AVC-LAN Warning 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 normal one and check if the same problem occurs again.

   OK: Same problem does not occur. 

NG: REPLACE RADIO AND NAVIGATION ASSEMBLY 

OK: END