Multi-media Interface ECU Communication Error: Procedure

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

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

   HINT: 

   • "P190" set by the radio receiver assembly 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.

   HINT: 

   The satellite radio tuner is built into the radio receiver assembly. If there is a problem between the satellite radio tuner and radio receiver assembly, replace the radio receiver assembly.

   COMPONENT TABLE
   
   

   Component	Proceed to
   Radio receiver assembly (190)	Radio receiver power source circuit, refer to Radio Receiver Power Source Circuit
   Satellite radio tuner (1F1)	Radio receiver power source circuit, refer to Radio Receiver Power Source Circuit
   Stereo component amplifier assembly (440)	Stereo component amplifier power source circuit, refer to Stereo Component Amplifier Power Source Circuit

NEXT: Go to next step 

1. Disconnect the F1 and F40 radio receiver assembly connectors.
   Fig 2: Identifying F1 And F40 Radio Receiver Connectors

   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
   F1-5 (ATX+) - F1-15 (ATX-)	Always	60 to 80 Ω
   F40-9 (TXM+) - F40-10 (TXM-)	Always	60 to 80 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Radio Receiver Assembly)
   *2	Component without harness connected (Radio Receiver Assembly)

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 AVC-LAN wiring diagram below, check the AVC-LAN circuit between the multi-media interface ECU and component shown by the sub-code.
   1. Disconnect all connectors between the multi-media interface ECU and component shown by the sub-code.
   2. Check for an open or short in the AVC-LAN circuit between the multi-media interface ECU and component shown by the sub-code.

      OK

      There is no open or short circuit.

      Fig 3: Identifying 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   7 

OK → END