Integration Control and Panel Assembly Communication Error: Procedure

1. Enter the diagnostic mode.
   Fig 1: Identifying Display Screen - Service Check Mode (Example)

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2. Press the preset switch "2" 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 the "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
   Stereo component amplifier (440)	Stereo component amplifier power source circuit

NEXT: Go to next step 

1. Disconnect the L51 and L52 receiver connectors.
   Fig 2: L51 and L52 Receiver Connectors

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

   Standard resistance

   Tester Connection	Condition	Specified Condition
   L51-5 (ATX+) - L51-15 (ATX-)	Always	60 to 80 Ω
   L52-9 (TX+) - L52-10 (TX-)	Always	60 to 80 Ω

NG → See step   6 

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". Refer to TERMINALS OF ECU .

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

      OK

      There is no open or short circuit.

      Fig 3: Identifying 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 → See step   7 

OK → END