Radio Receiver Communication Error: Procedure

1. Enter diagnostic mode.
   Fig 1: Service Check Mode And Detailed Information Mode Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Press the preset switch "3" to change the mode to "Detailed Information Mode".
3. Identify the component shown by the sub-code.

   HINT: 

   • "P190" set by the radio receiver is shown in the preceding illustration as an example.
   • 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
   Stereo component amplifier (440)	Stereo component amplifier power source circuit. Refer to Stereo Component Amplifier Power Source Circuit

NEXT: Go to next step 

1. Disconnect the radio receiver connector.
   Fig 2: Identifying E40 Radio Receiver Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E40-5 (ATX+) - E40-15 (ATX-)	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 Terminals of ECU. Refer to TERMINALS OF ECU .

1. Referring to the following AVC-LAN Wiring Diagram, 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 the 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: AVC-LAN Wiring Diagram

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the component shown by the sub-code with a known good one and check if the same problem occurs again.

   OK

   Malfunction disappears.

NG → See step   6 

OK → END