Multi-media Interface ECU Communication Error: Procedure

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

   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: 

   • The sub-code "P190" shown in the above example indicates the radio receiver assembly.
   • 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 assembly (190)	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 radio receiver assembly connectors.
   Fig 2: Inspecting Radio Receiver

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

   Standard Resistance

   W/ BACK DOOR SPEAKER
   
   

   Tester Connection	Condition	Specified Condition
   E2-5 (ATX+) - E2-15 (ATX-)	Always	60 to 80 Ω
   E16-9 (TXM+) - E16-10 (TXM-)	Always	60 to 80 Ω

   W/O BACK DOOR SPEAKER
   
   

   Tester Connection	Condition	Specified Condition
   E16-9 (TXM+) - E16-10 (TXM-)	Always	60 to 80 Ω

   TEXT IN ILLUSTRATION
   
   

   *A	w/ Back Door Speaker
   *a	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 the component shown by the sub-code.
   1. Disconnect all connectors between the multi-media interface ECU and the 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 the 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