Radio Receiver Communication Error: Procedure

1. Enter the diagnostic mode.
   Fig 1: View Of Service Check Mode And Detailed Information Mode Flow Chart

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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 .

NEXT: Go to next step 

1. Select the component shown by sub-code.

   HINT: 

   The "Bluetooth" handsfree module is built into the radio receiver. If there is a problem between the "Bluetooth" handsfree module and radio receiver, replace the radio receiver.

   Component Table:

   Component	Proceed to
   "Bluetooth" handsfree module (19D)	A
   Except "Bluetooth" handsfree module	B

A → REPLACE RADIO RECEIVER 

B: 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
   Stereo component amplifier (440)	Refer to Stereo Component Amplifier Power Source Circuit

NEXT: Go to next step 

1. Disconnect the radio receiver connectors.
   Fig 2: Identifying Radio Receiver Connector 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

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 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: View Of 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 RADIO RECEIVER 

OK → END