Integration Control and Panel Assembly Communication Error: Procedure

1. Enter the diagnostic mode.
   Fig 1: Service Check Mode Communication Diagram - Detailed Information Mode

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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 sub-code in the example shown in the illustration.
   • For details of the DTC display, refer to "DTC CHECK/CLEAR". Refer to DTC CHECK / CLEAR .

NEXT: Go to next step 

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	Proceed to
   Radio receiver (190)	Radio receiver power source circuit. Refer to Radio Receiver Power Source Circuit
   Stereo component amplifier (440)	Stereo component amplifier power source circuit. Refer to Stereo Component Amplifier Power Source Circuit
   Gateway ECU (1C6)	Gateway ECU power source circuit. Refer to Gateway ECU Power Source Circuit

NEXT: Go to next step 

1. Disconnect the radio receiver connectors.
   Fig 2: Identifying Radio Receiver Connectors And Terminals

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

   Standard resistance

   Tester Connection	Condition	Specified Condition
   ATX+ - ATX-	Always	60 to 80 Ω
   TXM+ - TXM-	Always	60 to 80 Ω
   TX+ - TX-	Always	60 to 80 Ω

NG → REPLACE RADIO RECEIVER 

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". Refer to TERMINALS OF ECU .

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

      OK

      There is no open or short circuit.

      Fig 3: AVC-LAN - Wiring Diagram

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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 INTEGRATION CONTROL & PANEL ASSEMBLY 

OK → END